EP1453976A2 - Procede d'analyse de l'expression de genes commandee par translation - Google Patents

Procede d'analyse de l'expression de genes commandee par translation

Info

Publication number
EP1453976A2
EP1453976A2 EP02792796A EP02792796A EP1453976A2 EP 1453976 A2 EP1453976 A2 EP 1453976A2 EP 02792796 A EP02792796 A EP 02792796A EP 02792796 A EP02792796 A EP 02792796A EP 1453976 A2 EP1453976 A2 EP 1453976A2
Authority
EP
European Patent Office
Prior art keywords
gene
mrna
solid matrix
variant
examined
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02792796A
Other languages
German (de)
English (en)
Inventor
Christoph Dr. Charle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Focusgenomics GmbH
Original Assignee
Focusgenomics GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Focusgenomics GmbH filed Critical Focusgenomics GmbH
Publication of EP1453976A2 publication Critical patent/EP1453976A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
    • C12Q1/6883—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for diseases caused by alterations of genetic material
    • C12Q1/6886—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for diseases caused by alterations of genetic material for cancer
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q2600/00—Oligonucleotides characterized by their use
    • C12Q2600/158—Expression markers

Definitions

  • the invention relates to a method in the field of transcription analysis and in particular comprises methods and kits for analyzing translation-controlled gene expression.
  • the method is based on the analysis of the translation efficiency of the 5'-NTR of the mRNA variants transcribed by one or more genes to be examined.
  • the data on the translation efficiency of the different mRNA variants transcribed by one or more genes to be examined are preferably part of a database system which, together with a specially designed tool for transcription analysis, provides a precise prediction of protein amounts in a cell type, tissue or organ to be examined by identification and quantification of the different mRNA variants transcribed by one or more genes.
  • Gene expression occurs in eukaryotes at the transcriptional level, post-transcriptional (polyadenylation of the RNA, mRNA splicing, export of the mature mRNA from the nucleus into the cytoplasm or targeted degradation of the RNA) Level of translation or post-translationally controlled [0].
  • the control of expression at the level of translation represents a new regulatory key mechanism for controlling gene expression [1].
  • mRNAs which code for genes whose expression is under translation control, are notable for their striking structure.
  • the 5'-untranslated region (5'-NTR) of most mRNAs is usually between 10 nucleotides (N) and 200 N long [7, 8].
  • N nucleotides
  • 5 'NTRs that are longer than 200 N and / or contain more than one start codon.
  • RNA of various other viruses RNA of various other viruses [14, 15].
  • -NTR of various cellular mRNAs that are transcribed in eukaryocytes one or more IRES could also be detected [16, 17, 18, 19, 20, 21, 22, 23 and 24].
  • mRNA variants are transcribed from genes, the expression of which is regulated at the level of translation.
  • the sequence of the coding region of all mRNA variants that are transcribed by a specific gene is identical.
  • the main transcript carries a long structured 5'-NTR, while the secondary transcripts carry shorter, less structured 5'-NTRs.
  • the emergence of these mRNA variants is due to the use of different transcription start sites and alternative splicing of the pre-mRNA [2, 12, 24].
  • two mRNA variants are transcribed from the bcl-2 gene.
  • the main transcript of the bcl-2 gene has a 5'-NTR that is more than 1,000 N long and contains several uORFs.
  • the bcl-2 secondary transcript carries an approximately 80 N long, weakly structured 5'-NTR and is translated preferentially. The proportion of the secondary transcript is about 5% of the Total amount of bcl-2 mRNA [2, 12].
  • a doubling of the transcription rate of the preferrally translated bcl-2 transcript triggered by external influences such as radiation, chemicals, cytostatics, hormones, cytokines, growth factors or stress, leads to a doubling of the protein concentration.
  • the total amount of bcl-2 mRNA increases by a total of 5%. With conventional methods of transcription analysis [26, 29] these changes cannot be determined precisely enough to be able to predict a change in the amount of protein.
  • Proteins such as growth factors, cytokines, hormone receptors, protein kinases, transcription factors, components of the translational apparatus and regulators of the cell cycle and apoptosis play a crucial role in the development and pathogenesis of neurodegenerative diseases, autoimmune diseases or cancer.
  • the formation of multiple chemoresistant tumor cells and some sub-areas of the so-called immune "escapes" are also influenced by the above-mentioned proteins [25].
  • the expression of many of the genes coding for these proteins is regulated at the translation level [1, 6].
  • the change in the amount of these proteins can be analyzed using the methods summarized under the term "proteomics" [30].
  • proteomics summarized under the term “proteomics” [30].
  • all known methods for analyzing and / or quantifying proteins are subject to restrictions, e.g.
  • the change in the amount of a particular protein is generally predicted by changing the amount of mRNA encoding that protein.
  • the methods by means of which the amount of mRNA which is transcribed by one or more genes can be determined include northemblot, slot and dot blots, nuclease protection assays, PCR and DNA arrays [26].
  • PCR-based methods and DNA arrays for transcription analysis enable the analysis of large amounts of samples, since their handling is relatively uncomplicated and can be automated.
  • the amount of mRNA transcribed by a gene is determined by detecting the coding region of this mRNA determined.
  • the amount of mRNA coding for a certain protein is not a sufficiently exact indicator for the actual amount of the corresponding protein, since in more than 50% of the genes examined the amount of protein detected did not match the amount of RNA Amount is correlated [29]. If the expression of a particular gene is regulated at the translation level, only the sum of all mRNA variants transcribed by this gene can be determined using the methods listed above.
  • a relatively precise assessment of the amount of protein present in a tissue or cell type can be achieved by analyzing the transcripts bound to polysomes, since these represent the actively translated mRNA [29, 31, 32 and 33].
  • the number of mRNA molecules bound by polysomes is a reliable indicator of the translation rate of the corresponding proteins, since it is generally accepted that translation control takes place mainly during the initiation phase [29, 34].
  • cytoplasmic RNA To isolate polysome-bound mRNA, cytoplasmic RNA must be isolated under conditions which prevent dissociation of RNA-protein complexes or RNA-ribosome complexes. Then polysomes are separated from monosomes and unbound mRNA by ultracentrifugation using a sucrose gradient [29, 31, 32 and 33]. The separation of core RNA and cytoplasmic RNA [36] and the subsequent ultracentrifugation step complicate the automation of the method and thus the parallel processing of a large number of samples.
  • An object of the present invention is to provide an advantageous method for expression analysis of a gene.
  • the present invention relates to a method for analyzing gene expression which, taking into account the translation state present in a cell type, tissue or organism, enables a reliable correlation of the amount of mRNA transcribed by a gene to be examined with the amount of protein translated by this mRNA.
  • the determination of the translation efficiency of all mRNA variants which are transcribed by a gene to be examined and which code for a specific protein enables, inter alia, the identification of the mRNA variant which is translated in a certain cell type, tissue or organism.
  • a reliable prediction of the amount of the protein expressed in a cell type, tissue or organism can be made on the basis of the amount and the translation efficiency of the preferentially translated mRNA variant coding for a protein to be examined.
  • the method enables the simultaneous analysis of the translation-controlled expression of a large number of genes and thus the analysis of functional relationships in a cell type, tissue or organism.
  • the method enables the amount of one or more proteins to be examined in a tissue or cell type to be predicted by determining the transcription rate of the preferrably translated mRNA.
  • the invention therefore relates to a method for expression analysis of at least one gene coding for a protein in a sample, which comprises, if appropriate, determining the number and identity of different mRNA variants of the gene to be analyzed which are present in the sample; the respective amounts of the different mRNA variants of the gene to be analyzed are determined in the sample available; and on the basis of the quantities determined and the respective translation efficiency of the different mRNA variants, the quantity of protein coded by the gene to be analyzed is determined, which is present in the sample.
  • the sample is usually a composition that comprises cells, a tissue or parts of an organ.
  • it can be a biopsy or cells in cell culture.
  • the sample preferably originates from a culture of mammalian cells, from a tissue or an organ of a mammal.
  • the sample is not analyzed directly itself, but rather a composition is obtained or produced from it, which contains nucleic acid, which is mRNA or is derived therefrom.
  • This composition is preferably a preparation of total RNA or polyA + ⁇ RNA obtained or produced from the sample.
  • the nucleic acid contained in the composition can also be cRNA or cDNA. Such preparations can easily be made from a composition containing mRNA.
  • the composition is analyzed and the number, identity and / or amount of the different nucleic acid variants of the genes to be analyzed in the composition can be used to infer the number, identity and / or amount of the different nucleic acid variants of the gene to be analyzed in the sample.
  • These probes preferably each contain 10 to 40 consecutive nucleotides or consist of 10 to 40 consecutive nucleotides, each of which is part of the nucleotide sequence of the gene to be analyzed, with a first probe complementary to part of the nucleotide sequence of a first mRNA variant or one corresponding to this variant of the gene is cDNA, but this first probe is not complementary to a part of the nucleotide sequence of a second mRNA variant or a cDNA of the gene corresponding to this variant.
  • a second probe is complementary to part of the nucleotide sequence of the first mRNA variant or a cDNA of the gene corresponding to this variant, and this second probe is also complementary to part of the nucleotide sequence of the second mRNA variant or one cDNA of the gene corresponding to this variant.
  • the first probe is specific for the first mRNA or cDNA variant, but the second probe can hybridize with the first and the second mRNA or cDNA variant.
  • the solid matrix can be brought into contact with the composition which has been obtained or produced from the sample, it being possible for hybridization of nucleic acid molecules in the composition to take place with one or more probes.
  • the number and identity of the different variants of nucleic acids present in the composition, which are encoded by the gene to be analyzed are then determined.
  • the respective amounts of the different variants of nucleic acids present in the composition, which are encoded by the gene to be analyzed are also determined.
  • the amounts determined in this way and the respective translation efficiency of the various mRNA variants of the gene to be analyzed determine the amount of protein encoded by the gene which is present in the sample from which the composition was obtained or produced.
  • the solid matrix can also contain a third probe, which can hybridize with a third mRNA variant or the corresponding cDNA because it is complementary to it. Due to complementarity, it can also hybridize with the first and the second mRNA variant or the corresponding cDNA. However, the third mRNA variant or the corresponding cDNA is not recognized by the first and the second probe.
  • the probes are designed so that the first mRNA variant is recognized by all three probes, the second mRNA variant only by the second and the third probe, and the third mRNA variant only by the third probe. The number of probes required to distinguish even more different mRNA variants is correspondingly higher. It is clear to the person skilled in the art that more probes can be used than is theoretically necessary to distinguish between the different mRNA variants.
  • the probes immobilized on the solid matrix contains a nucleotide sequence which is part of the coding region of the gene to be analyzed.
  • the probes immobilized on the matrix can contain the entire genomic nucleotide sequence of the 3 'non-coding region, the 5' non-coding region or the entire non-coding region of the to be analyzed "Cover" the gens.
  • the probes can also record the entire genomic nucleotide sequence of the gene to be analyzed. The nucleotide sequences of the individual probes can overlap.
  • one or more probes are immobilized on the solid matrix, each of which contains parts of the nucleotide sequence of bacterial genes, plant genes and / or housekeeping genes of the organism from which the sample originates. These probes are usually 10 to 40 nucleotides in length. Examples of housekeeping genes are e.g. B. genes coding for ⁇ -actin, GAPDH or L32.
  • the solid matrix is designed as a DNA array on which the probes are immobilized in the form of spots.
  • 2 different mRNA variants can be transcribed from the gene to be analyzed, but it is also possible for 3 or more different variants to be transcribed.
  • the different variants can differ at the 5 'end and / or at the 3' end and / or represent different splice forms of the gene.
  • the invention also relates to a solid matrix as described for the method according to the invention.
  • kits for expression analysis of at least one gene in a sample comprises a solid matrix, as has already been described, and as component 2, a storage medium on which the respective translation efficiencies of the different mRNA variants of the gene to be analyzed are stored. Furthermore, it can comprise a device for determining the respective amounts of nucleic acid which are bound to the respective probes after a composition containing nucleic acid has been brought into contact with the solid matrix. Preferred embodiments of the solid matrix of component 1 correspond to preferred embodiments of the matrix in the described method.
  • Component 2 may contain further transcription profiles. These can be transcription profiles that come from cells, tissues or organisms that have been changed by a disease.
  • diseases are cancer, neurodegenerative diseases, autoimmune diseases, chronic diseases of old age, cardiovascular diseases, viral diseases and drug resistance.
  • they can be transcription profiles that originate from tumor cells that have been treated with one or more therapeutic agents.
  • the other transcription profiles in component 2 can be stored on the same storage medium as the translation efficiencies, but they can also be stored on one or more separate storage media.
  • Another aspect of the invention is the use of the solid matrix described for determining the protein concentration in a sample, for determining or analyzing diseases, for determining or analyzing the effects of external influences on cells to be examined or for determining the secondary structure of RNA molecules.
  • Component 1 is usually a DNA array for the identification and quantification of all mRNA variants that are transcribed by one or more genes to be examined. With the help of the specially designed DNA array contained in component 1, in addition to the quantitative determination of the transcription of different genes, alternatively used transcription start sites of these genes and splice variants in the 5'-NTR or in the 3'-NTR of the mRNA variants transcribed by these genes are used analyzed and quantified.
  • the DNA array enables a combination of nuclease protection assay, Northemblot and quantitative RT-PCR [26] to be determined.
  • Component 2 can be a software package that consists of a database and an analysis module.
  • the database possibly on a storage medium, values for the translation efficiency of all mRNA variants transcribed by the genes to be examined are organized under different conditions.
  • the database contains all the data necessary to be able to reliably predict the amount of a protein translated in a particular cell type, tissue or organism using a transcription profile.
  • the analysis module embedded in component 2 uses the transcription pattern created with component 1 and the database to determine the amount of the preferrably translated mRNA variant or mRNA variants that are transcribed from one or more genes to be examined in a cell type, tissue or organism under certain conditions become.
  • the system relates to methods for determining or analyzing the effects and side effects of various external influences on the cell types, tissues or organisms to be examined.
  • Component 1 analyzes poly A + mRNA, total cellular RNA or cDNA from cells, tissues or organisms produced from these RNA populations and which has been exposed to one or more of the above-mentioned influences. These transcription profiles are compared with transcription profiles of the same or similar cells, tissues or organisms that were not exposed to the external influences mentioned above.
  • the system can be used, for example, to analyze the effect on cells and the potential for the formation of a multiple chemoresistant phenotype when developing new tumor therapeutics.
  • the system can further include methods for analyzing clinical pictures, which include, among others, neurodegenerative syndromes, cancer, autoimmune diseases, chronic diseases of old age, cardiovascular diseases, viral diseases and / or drug resistance.
  • the system for analyzing and evaluating the metastatic potential and aggressiveness of a tumor as well as for analyzing and evaluating the multiple chemoresistance of tumors should be used in order to achieve an improvement in therapeutic services and to enable the design of individual forms of therapy.
  • the database module of component 2 is expanded here by data records which include transcription profiles of tumor cells created with component 1 as well as clinical data on these tumor cells.
  • these data sets contain component 1 transcription profiles of cultured tumor cells that have been treated with various tumor therapeutic agents as well as data (e.g. division rate, apoptosis rate and others) on the response of these cells to the therapeutic agents (reaction profiles).
  • the invention relates to methods for determining the secondary structure of mRNA molecules.
  • the secondary structure of catalytically active RNAs so-called ribozymes, or regulatory regions of mRNAs, such as internal ribosome entry points (IRES)
  • IRS internal ribosome entry points
  • the special design of the DNA array (component 1) is a complete replacement for the nuclease protection assay used in standard laboratory practice [26]. In conventional nuclease protection assays, it is not always possible to clearly determine which region of the probe target duplex is double-stranded is protected against nucleases.
  • a major advantage of the present invention is that the exact sequence of the "protected" areas is displayed.
  • the RNA molecules to be examined are subjected to a partial RNAse digestion and then hybridized with the DNA arrays.
  • the DNA array (component 1) enables the identification of double-stranded areas in an RNA molecule to be examined. In conjunction with common algorithms for the calculation of secondary structures of nucleic acids [24], this data can be used to create a reliable model for the folding of the RNA molecule to be examined. This enables the creation of three-dimensional models of IRES elements, enzymatically active RNAs (ribozymes) or other RNA structures without the use of spectroscopic methods or X-ray structure analysis for the first time.
  • Component 1 (DNA array)
  • Component 1 is preferably a DNA array which is specifically tailored to the requirements of the system and with the aid of which, in a quantity of sample nucleic acids, which can be total RNA, polyA + mRNA, or cDNA, any mRNA variant is transcribed, identified and quantified by one or more genes to be examined.
  • the DNA array will contain probe nucleic acids for the detection of all mRNA variants which are necessary for the analysis, diagnosis or interpretation of the effect of one or more specific external influences on a cell type, tissue or organism to be examined.
  • These external influences can include a change in the oxygen partial pressure, the food supply, the temperature, the air pressure and the action of cytokines, hormones, cytostatics or other active substances, as well as pathological changes such as cancer, neurodegenerative syndromes, autoimmune diseases, cardiovascular diseases, viral infections and drug resistance , Design and interpretation of the DNA array
  • a single-stranded nucleic acid which may be DNA, RNA or a nucleic acid analog such as PNA (Peptide Nucleic Acid) [27], and whose base sequence is identical to the base sequence of the 5'-non-coding region (5'-NCR), the coding
  • the region (CR) and optionally the 3'-non-coding region, (3'-NCR) of a gene to be examined is divided into oligonucleotides with a length L x of at least 10 and at most 40 nucleotides.
  • the exact length L x of the individual oligonucleotides is a function of the predetermined equilibrium melting temperature (T m ) and its base composition (% GC), that is % GC) [37, 38, 39, 40, 41 and 42] and is
  • the resolution of the method depends on the length L of the segments, hereinafter referred to as probe nucleic acids.
  • the length L x of the probe nucleic acids and thus the resolving power vary along the sequence to be examined.
  • the synthetic oligonucleotides corresponding to the base sequence of the gene to be examined are bound to a solid matrix, preferably covalently.
  • This solid matrix can be a surface (DNA array), a fiber or the surface of a microparticle [45] made of plastic (eg polypropylene, nylon), polyacrylamide, nitrocellulose or glass.
  • the oligonucleotide probes can be covalently linked to the solid matrix on the one hand by in situ oligonucleotide synthesis [46, 47, 48 and 49] or by applying modified oligonucleotides, which can be DNA, RNA or PNA, to an activated surface [50, 51].
  • probe nucleic acids Devices for printing DNA arrays are manufactured and sold by a number of suppliers [57].
  • the synthesis of the probe nucleic acids takes place according to protocols which are laboratory standard in the field of biotechnology [52].
  • the covalently bound probe nucleic acids are in an order corresponding to that
  • the base sequence of the gene to be examined is arranged in such a way that a DNA strand which carries the base sequence of the gene to be examined is remodeled in the 5'-3 'direction on the matrix ("tiled array").
  • the probe nucleic acids thus fixed on the matrix are divided into three areas.
  • FIG. 1 shows a schematic representation of the probes, of different mRNA variants transcribed by a gene to be examined, the solid-phase-bound probes (array) and an evaluation of the hybridization data.
  • Region A, region B or region C contains all probe nucleic acids whose base sequence is identical to the base sequence of the 5'-non-coding region (5'-NCR), the coding region (CR) or the 3'-non-coding region (3 ' -NCR) of the gene to be examined.
  • the matrix-bound probe nucleic acids are brought into contact with single-stranded sample nucleic acid, which can be mRNA, cRNA or cDNA [26], under conditions which enable duplex formation by hybridization of complementary, single-stranded nucleic acids.
  • sample nucleic acid which can be mRNA, cRNA or cDNA [26]
  • the base sequence of the probe nucleic acids is identical to that of the codogenic strand (sense strand) of the gene to be examined.
  • mRNA or cRNA is used as the sample nucleic acid
  • the base sequence of the probe nucleic acids is identical to that of the non-codogenic strand (antisense strand) of the gene to be examined.
  • sample nucleic acids can be labeled radioactively, with fluorophores or parts of a binding pair (biotin, streptavidin) [26] or the probe nucleic acids with fluorophores or parts of a binding pair (biotin, streptavidin) [27, 28].
  • Sequence sections of the gene to be examined which are not contained in the base sequence of the mRNA variants transcribed by this gene, do not hybridize with the solid-phase-bound probe nucleic acids (see FIG. 1). These sequence segments comprise intron sequences, sequence segments of the 5'-NCR (probe region A) of the gene to be examined located upstream from the individual transcription start of a specific mRNA variant, and sequence segments in the 3'-NCR (probe region C) of the gene to be examined, which are downstream of the gene 3 'end of a certain mRNA variant.
  • the coding area of all mRNA variants, from the investigating gene are transcribed, hybridized with the probe nucleic acids, the base sequence of which is identical to that of the coding region (probe region B) of the gene to be examined.
  • the signal intensity of the hybridization signals (I B ( C)) detectable in probe region B are equal to the sum of the signal intensities of the detectable hybridization signals ( ⁇ (I (NAI). '((R A -!), ---, I (RM A ⁇ )) of the individual mRNA variants that are transcribed by a gene to be examined.
  • IB (CR) ⁇ (I (RNA1), l (RNA2), - - -, l (RNAn))
  • Hybridization signals detectable in probe area A or probe area C (I A (5'-N T R) or I C (3 '-N T R ) ), which have the same signal intensity as the hybridization signals detectable in probe area B ( I B (CR) ) correspond to sequence motifs outside the coding region which are contained in all mRNA variants which are transcribed by a gene to be examined.
  • the start of transcription which is furthest upstream (in the 5 'direction) from the coding region, is indicated by the first probe nucleic acid in probe region A, which has a detectable hybridization signal after hybridization with sample nucleic acid (I A ( D) - If only one mRNA variant is transcribed from this start of transcription, then is
  • probe nucleic acids in probe area A have hybridization signals of the same intensity which are equal to the signal intensity of the hybridization signals in probe area B. The following applies:
  • the intensity of the hybridization signals of mRNA variant 1 transcribed from the first start of transcription in probe area A is lower than the signal intensities of the hybridization signals in probe area B.
  • RNA 1 mRNA variant (RNA 1) transcribed from transcription start 1. If two genes of different genes with different transcription starts, ie with different long 5'-NTRs, are transcribed from one gene to be examined, see above is:
  • probe nucleic acids in probe area A that hybridize specifically with RNA 2 have hybridization signals of the same intensity that are equal to the signal intensity of the hybridization signals in probe area B.
  • the signal intensity of the hybridization signals (IB (C) ) detectable in probe area B is equal to the sum of the signal intensities of the detectable hybridization signals ( ⁇ (I (R N AI ), l ( R N A2 ), --- (RNAn) ) of the individual mRNA variants transcribed by a gene to be examined, the following applies:
  • the intensity of the hybridization signals is the probe region of the mRNA variants transcribed by all start sites except the last one before the first start codon of the coding region A less than the signal intensities of the hybridization signals in probe area B (see above).
  • the proportion of each mRNA variant to the total amount of the different mRNA variants transcribed by a gene to be examined can be determined on the basis of the hybridization intensities.
  • the transcription start of both mRNA variants is carried out by the first probe nucleic acid in probe region A, which after hybridization with sample nucleic acid has a detectable hybridization signal, indicated ( 1 l A ( i ) ).
  • the intensity of the hybridization signals corresponds to the sum of the intensities of the two mRNA variants (spliced: mRNAs and unspliced: mRNA) and is equal to the intensity of the hybridization signals in probe area B.
  • probe region A or C must represent the entire genomic sequence to be examined.
  • the DNA array can contain yet another region which contains probe nucleic acids which hybridize specifically with a selection of mRNAs from housekeeping genes and with a selection of plasmids, bacterial or plant RNAs.
  • This probe area serves on the one hand to standardize the hybridization signals in probe areas A, B and C and to control the stringency of the hybridization.
  • cDNA labeled from total RNA or polyA + mRNA is synthesized by reverse transcription using oligo-dT or p (dN) ⁇ as starter oligonucleotide.
  • the enzymatic synthesis of cDNA by reverse transcriptase is laboratory standard in the field of biotechnology [26].
  • the reverse transcription of sample RNA is carried out in the presence of dNTPs conjugated to a detectable group, preferably a fluorophore or part of a binding pair.
  • Another option is to use isolated mRNA to convert into double-stranded cDNA by reverse transcription and to synthesize labeled cRNA from it by in vitro transcription in the presence of rNTPs conjugated with detectable groups [26, 53].
  • the probes immobilized on the DNA array are marked.
  • This label can be one or more fluorophores or part of a binding pair.
  • fluorophores such as e.g. Fluorescein, Lissamin, Phycoerythrin, Rhodamine (Perkin Elmer Cetus), Cy2, Cy3, Cy 3.5, Cy5, Cy5.5, Cy7, FluorX (Amersham) can be used [53].
  • fluorophores listed here other fluorophores not listed here can also be used for labeling. These include all fluorophores that can be covalently linked to nucleic acids and whose excitation and emission maxima are in the infrared range, in the visible range or in the UV range of the spectrum.
  • sample or probe nucleic acid is labeled with parts of a binding pair such as biotin or digoxigenin
  • a detectable label streptavidin or anti-digoxigenin AK
  • the detectable label of the second part of the binding pair can be a fluorophore or an enzyme (alkaline phosphatase, horseradish peroxidase etc.) that converts a substrate with light emission (chemiluminescence or chemifluorescence) [54, 55].
  • the hybridization and washing conditions are set so that the sample nucleic acids can specifically bind to a specific probe nucleic acid immobilized on a solid matrix, or can hybridize specifically with this probe nucleic acid. That is, the sample nucleic acid binds, hybridizes or forms a duplex with an immobilized probe nucleic acid that has a sequence complementary to the sample nucleic acid and not to an immobilized probe nucleic acid that has a non-complementary base sequence.
  • one polynucleotide sequence is said to be complementary to another if a hybrid of two Polynucleotides, of which the shorter (the probe nucleic acid) is a maximum of 25 N long, have no base mismatches over the entire length of the shorter polynucleotide according to the standard rules for base pairing. Furthermore, a hybrid of two polynucleotides in which the shorter of the two polynucleotides is longer than 25 N may not contain more than 5% mismatches according to the standard rules for base pairing.
  • the polynucleotides are preferably perfectly complementary to one another; The hybrid does not contain any mismatches.
  • the optimal hybridization conditions depend on the one hand on the length and type of the probes (DNA, RNA, PNA) immobilized on a solid matrix and on the type of sample nucleic acids (DNA or RNA) used. Generally valid parameters for a specific (ie stringent) hybridization are described in common manuals and protocols for hybridization of nucleic acids [26, 56].
  • probe or sample nucleic acids labeled with fluorophores are used to detect hybridization events on the DNA array from component 1, the fluorescence emission at each sample point (spot) can preferably be measured by confocal laser scanning microscopy.
  • the detection of hybridization events in nucleic acids by chemiluminescence or chemofluorescence can also be carried out with the use of suitable filters and detectors with devices that work on the principle of the confocal laser scanning microscope. Devices for signal detection on biochips are developed and sold by a number of manufacturers [57].
  • Component 2 (database & analysis)
  • Component 2 of the system preferably consists of a database and an analysis module.
  • the database contains data on the translation efficiency of all mRNA variants which are transcribed by genes whose expression is regulated at the translation level.
  • the data organized in the database module describe, for example, the influence of the 5'-NTR, the influence of the coding region and the 3'-NTR, and the influence of the cell type, tissue or organism on the translation efficiency of various mRNA variants transcribed by one or more genes. Additional data sets can have the effect of external influences on the Describe the translation efficiency of the mRNA variants to be examined.
  • mRNA variant transcribed by translation-controlled expressed genes which is preferentially translated in different cell types, tissues or organisms, is also part of the database module of component 2.
  • mRNA variants with identical coding regions which differ in length and base sequence of their 5'-NTRs or 3'-NTRs, are transcribed from genes which are expressed in a translation-controlled manner.
  • the transcription start sites, splice variants, the number of mRNA variants transcribed by a gene to be examined, the amount of the mRNA variants transcribed in a cell type, tissue or organism and the translation efficiency of the individual mRNA variants are known.
  • the transcription starts used in a cell type, tissue or organism in the 5 'non-coding region of a gene to be examined are identified and localized with the aid of nuclease protection assays, PCR methods or hybridization with DNA arrays (component 1) [26].
  • the splice sites ie intron-exon transitions in the area of the 5'-NTR or the 3'-NTR of the mRNA to be examined, are mapped by nuclease protection assays, PCR methods or hybridization with DNA arrays (component 1) [26] ,
  • the base sequence of the hybridization probes which are used in a nuclease protection assay for examining the transcription start (s) and the splice variants of a gene to be examined, corresponds to the base sequence of the gene to be examined.
  • Total cellular RNA [26, 36] or polyA + mRNA is isolated [26, 43] from the cell types, tissues or organisms to be examined and hybridized with the labeled probes, which may be cDNA or cRNA.
  • the Digestion of single-stranded areas in the hybrids and the gel electrophoretic separation of the resulting fragments [26, 44] are carried out according to protocols that are laboratory standards in the field of biotechnology.
  • RNA is investigated from the cell types, tissues or organisms to be examined [26, 36] or polyA + mRNA isolated [26, 43] and transcribed into cDNA by reverse transcription [26].
  • the PCR primers are oligodeoxynucleotides with which specific fragments are amplified, the 5 'portion of the coding region and the 5' non-coding region of the gene to be examined, and the coding region and the 5 'NTR of the mRNA transcribed by this gene Represent variants.
  • PCR primers are used, with which fragments can be amplified, which encompass the 3'-portion of the coding region and the 3'-non-coding region of the represent investigating gene or the mRNA variants transcribed by this gene.
  • one or more 3'-primers (3'-primers bind to the 3'-end of the DNA fragment to be amplified) in the 5 ' -Area of the coding region of the gene to be examined.
  • the population of 5'-primers extends from the beginning of the coding region to the first transcription start point of the gene to be examined.
  • the positions and sequence of the 5 'primers are selected such that fragments are amplified together with a 3' primer, the length of which increases from 30 to 60 bp from the first pair of primers in the coding region.
  • a 3' primer the length of which increases from 30 to 60 bp from the first pair of primers in the coding region.
  • the reactions are carried out with genomic DNA or plasmids, which contain the necessary regions of the gene, and mRNA from cells, tissues or organisms to be examined. By comparing the fragment size and quantity, transcription start points and splice points can be identified. Quantitative determination of the mRNA variants transcribed by a gene to be examined
  • the proportion of each individual mRNA variant in the total amount of mRNA variants transcribed from a gene to be examined is determined by quantitative PCR methods (TaqMan® or Molecular Beacons [58, 59]), multiprobe nuclease protection assays, or DNA arrays (component 1 ) [26] determined.
  • the PCR primers correspond to those used to identify the mRNA variants transcribed by one or more genes to be examined.
  • TaqMan® probes or molecular beacons [58,59] are used, with which the different mRNA variants are specifically detected and quantified using their respective 5'-NTRs.
  • PCR primers and TaqMan® probes or molecular beacons are used, with which a selection of housekeeping genes is specifically detected.
  • the template used is cDNA, which is synthesized by reverse transcription of total cellular RNA [26, 36] or polyA + mRNA [26].
  • the hybridization probes used in a multiprobe nuclease protection assay which can be cDNA or cRNA, are of different lengths, so that they can be easily distinguished from one another by polyacrylamide gel electrophoresis [26].
  • the nucleotide sequence of the hybridization probes is complementary to the nucleotide sequence of the 5'-NTR of the various mRNA variants to be investigated and to the coding sequence of the mRNA of a selection of housekeeping genes.
  • the quantitative PCRs and the multi-sample nuclease protection assays are carried out according to protocols that are laboratory standards in the field of biotechnology.
  • the transcription rate of the mRNA variants transcribed by one or more genes to be examined is preferably carried out by hybridizing total cellular RNA, polyA + mRNA or labeled cDNA with component 1 (DNA array) of the system (see above).
  • the transcription rates of the mRNA variants transcribed by one or more genes to be investigated, determined using the methods mentioned, are normalized against the transcription rate of one or more housekeeping genes, such as, for example, ⁇ -actin, GAPDH, L32.
  • the quantitative determination of the mRNA variants which are transcribed in different cell types, tissues or organisms from genes expressed in a translation-controlled manner is preferably carried out using the DNA array of component 1 of the system.
  • the DNA array is hybridized with cellular total RNA, polyA + mRNA or labeled cDNA, which was isolated from cells to be examined.
  • the cell lines contained in the NCI-60 panel [35] serve as the basis here, which are characterized very comprehensively.
  • the transcription of the mRNA variants of genes expressed in a translation-controlled manner is determined in clinical samples and other established cell lines.
  • the change in the transcription rate of the mRNA variants transcribed by one or more genes and the change in the expression rate of the corresponding proteins are usually measured as a function of various external influences.
  • These external influences include, among other things, a change in the oxygen partial pressure, the food supply, the temperature, the air pressure and the action of cytokines, hormones, cytostatics or other active substances.
  • the transcription rate of the mRNA variants to be investigated is determined by quantitative RT-PCR, multiprobe nuclease protection assays or, preferably, with the aid of the DNA array (component 1) described above (see above).
  • the expression rate of the corresponding genes is carried out by measuring the concentration of the corresponding proteins by immunochemical methods such as Western emblot, immunoprecipitation or ELIZA [65, 66 and 67]. Since it is generally accepted that the control of translation takes place mainly during the initiation phase [29, 34], the amount of protein detectable in a cell type, tissue or organism is directly proportional to the amount of the corresponding mRNA variants.
  • the mRNA variant is the transcription rate of which, depending on external influences, corresponds to the expression rate of the corresponding protein, is the mRNA which is translated in a specific cell type, tissue or organism. Which of the mRNA variants transcribed by a gene to be investigated is translated preferentially depends on the sequence of the 5'-NTR of the mRNA variants on cell, tissue or organism-specific expressed factors which influence the initiation of translation.
  • the quantitative determination of the mRNA variants, which are transcribed in different cell types, tissues or organisms from genes expressed in a translation-controlled manner is preferably carried out with the DNA array of component 1 of the system.
  • the DNA array is hybridized with total cellular RNA, polyA + - mRNA or labeled cDNA, which was isolated from cells to be examined.
  • the amount of proteins translated by the mRNA variants is determined using standard immunochemical methods.
  • the cell lines contained in the NCl-60 panel [35] serve as the basis and are characterized very comprehensively. Furthermore, the transcription of the mRNA variants of genes expressed in a translation-controlled manner and the expression of these genes are determined in clinical samples and other established cell lines.
  • the rate-determining step in protein synthesis is initiation.
  • initiation factors, the ribosomal subunits and the migration of the complete ribosome to the first start codon of the open reading frame is essentially dependent on length and structure, that is to say ultimately on the base sequence of the 5'-NTR of the mRNA to be examined.
  • the translation efficiency of the different mRNA variants transcribed by one or more genes to be examined is determined by reporter gene assays.
  • the 5'-NTRs of the various mRNAs translated by one or more genes to be investigated are amplified and isolated from total RNA or polyA + mRNA using reverse transcriptase PCR [26] or from cDNA banks [26] using PCR ,
  • the PCR primers are chosen so that the 5'-nucleotide of the 3'-primer corresponds to the last nucleotide of the 5'-NTR before the start codon of the coding region.
  • the corresponding 5 'primer is as close as possible to the start of transcription of the mRNA variant to be examined.
  • Recognition sequences of restriction endonucleases can be integrated into the 5 'region of the PCR primer in order to facilitate the ligation of the fragments into a suitable reporter gene vector (pGL3 basic and others; Promega) [26].
  • a suitable reporter gene vector pGL3 basic and others; Promega
  • Various systems are used, with the help of which, among other things, the influence of the coding region on the translation efficiency of the mRNA variants to be examined can be determined.
  • the various 5'-NTRs to be examined are amplified by means of the PCR and into a plasmid vector (pGL-3 / T7) between the 3'-end of the T7 promoter and the 5'-end of for photinas Gene encoding pyralis luciferase ligated [68, 69], protocols for the transfection and multiplication of plasmid vectors in suitable E. coli host strains and for the isolation of plasmid DNA from the host organisms are laboratory standards in the field of biotechnology [26].
  • the plasmid vector is cut at the 3 'end of the luciferase gene using a suitable restriction endonuclease.
  • the linearized plasmid DNA is used as a template in an in vitro transcription reaction that is catalyzed by a phage-encoded RNA polymerase (T7, T3 or SP6 RNA polymerase) [26].
  • a phage-encoded RNA polymerase T7, T3 or SP6 RNA polymerase
  • an mRNA can be synthesized that bears a 5'-cap structure.
  • the enzyme photinas pyralis luciferase is synthesized from the in vitro synthesized photinas pyralis luciferase mRNA variants using an in vitro translation system (Rabbit Reticulocyte Lysate).
  • the test parameters it can be determined whether an mRNA to be examined can be translated independently of a 5'-cap structure, that is to say whether the 5'-NTR of this mRNA contains an IRES element.
  • the translation efficiency of an mRNA carrying a certain 5'-NTR and a 5'-cap structure is compared with the translation efficiency of an mRNA which does not have the same 5'-NTR 5'-cap structure bears, compared.
  • a DNA is inserted into the reporter gene vectors mentioned above between the 3' end of the T7 promoter and the 5 'end of the 5' NTR to be examined. Ligated fragment that can form a stable hairpin loop. If this plasmid DNA is used as a template in an in vitro transcription reaction, an mRNA is synthesized which bears a stable hairpin structure at the 5 'end. This structure very effectively prevents the initiation of translation according to the ribosome scanning model [1].
  • Measurement of translational efficiency in vivo In order to investigate the influence of cellular factors on the translational efficiency of one or more mRNAs to be examined depending on the cell type, tissue or organism, eukaryotic expression vectors which contain the 5-NTR of the mRNA variant to be investigated on the 5'- Contained end of a marker gene, transfected into cultured cells, tissue samples or organisms. If the translation efficiency of reporter gene mRNAs which carry different 5'-NTRs is to be examined depending on different cell types, tissues or organisms, the reporter gene constructs are designed as follows.
  • CMV CMV, RSV or SV40 promoter
  • a reporter gene photinas pyralis luciferase, ren // a reniformis luciferase, chloramphenicol transferase (CAT), ⁇ -galactosidase, GFP or others
  • CAT chloramphenicol transferase
  • GFP ⁇ -galactosidase
  • the dual luciferase system (Promega) is the ideal solution here, since with this system both the actual measurement (photinas pyralis luciferase) and the expression of the control construct (renilla reniformis luciferase) can be carried out in one approach [71, 72].
  • the luciferase activity in the different batches is determined in a luminometer [Luciferase Assay, Promega, 26].
  • the base value (100%) for all measurements is the luciferase activity in batches which contain lysates of cells, tissues or organisms which have been transfected with a reporter gene vector which codes for a photinas pyralis luciferase mRNA, the 5'-NTR of which is exclusively a Kozak Consensus sequence includes [7, 8].
  • a reporter gene vector which codes for a photinas pyralis luciferase mRNA, the 5'-NTR of which is exclusively a Kozak Consensus sequence includes [7, 8].
  • the joint influence of the 5'-NTR and the coding region on the translation efficiency of an mRNA to be examined cannot be determined by reporter gene assays in which the expression rate is measured on the basis of the enzymatic activity of a reporter protein.
  • a fusion protein, the amino-terminal half of which consists of a protein to be investigated and the carboxy-terminal half of which consists of a reporter protein is often folded differently from the two unfused proteins. Therefore, the enzymatic activity of the reporter protein portion in fusion proteins depends on the protein with which the reporter protein is fused. To avoid these problems, the protein to be examined is fused to a short marker peptide at the carboxy terminus.
  • This marker peptide can include a CBP tag (calmodulin binding peptide; Stratagene), FLAG tag (Sigma-Aldrich) or a His tag (5-7 histidine residues in succession) [73, 74].
  • CBP tag calmodulin binding peptide
  • FLAG tag Sigma-Aldrich
  • His tag 5-7 histidine residues in succession
  • the PCR products are ligated into an expression plasmid between the 3'-end of a viral promoter (CMV, RSV, SV40 and others) and the 5'-end of the sequence coding for the marker peptide, so that the coding region of the mRNA to be examined is included the sequence coding for the marker peptide is fused.
  • a viral promoter CMV, RSV, SV40 and others
  • the plasmid vectors for the expression of the fusion proteins described above are commercially available (Qiagen, Clontech, Stratagene).
  • the transfection of E. coli host strains with the plasmids, the multiplication of the plasmids and the isolation of the plasmid DNA are carried out according to protocols which are laboratory standard in the field of biotechnology [26].
  • Different cell types, tissues or organisms to be examined are transfected with the expression constructs described above, which contain the cDNA sequence of the 5'-NTR and the coding region of the different mRNA variants transcribed by one or more genes.
  • a reporter gene plasmid the photinas pyralis luciferase or renilla reniformis luciferase, is used to determine the transfection efficiency expressed, co-transfected.
  • the translation efficiency of the different mRNA variants expressed by expression plasmids is determined by Western blot or slot blot methods [65, 66].
  • the fusion proteins are detected with the help of an antibody or protein that specifically binds the marker peptide.
  • the quantitative detection of proteins takes place according to protocols that are laboratory standard in the field of biotechnology.
  • the base value (100%) for all measurements is the detectable amount of fusion protein in batches which contain lysates from cells, tissues or organisms which have been transfected with an expression construct which carries the cDNA sequence of an mRNA variant to be investigated, the 5th '-NTR contains only a Kozak consensus sequence [7, 8].
  • the cells transfected with expression plasmids are exposed to various external influences, which can include, among other things, a change in the oxygen partial pressure, the food supply, the temperature, the air pressure and the action of cytokines, hormones, cytostatics or other active substances.
  • the measurements described here are carried out in the cell lines contained in the NCI-60 panel [35], which are characterized very comprehensively.
  • the translation efficiency of mRNA variants to be examined is determined in clinical samples and other established cell lines. Measurement of the effects of external influences on cellular functions such as growth, apoptosis or proliferation
  • the effect of external influences on the cells, tissues or organisms to be examined is determined on the basis of a number of parameters, which can include the rate of apoptosis, the rate of proliferation and cell growth.
  • the external influences mentioned here can include, among other things, a change in the oxygen partial pressure, the food supply, the temperature, the air pressure and the action of cytokines, hormones, cytostatics or other active substances.
  • Cells, tissues or organisms to be examined are kept in culture and exposed to one or more specific external influences for 24 to 48 hours. To determine the effect of differently high doses of the external influence to be examined, cell growth, apoptosis rate and / or proliferation rate in the treated cells are determined, among other things.
  • the rate of growth, proliferation and / or apoptosis in culture cells is determined according to protocols which are laboratory standard in the field of biotechnology and cell biology [75, 76, 77, 78 and 79].
  • the rate of growth, apoptosis and proliferation is increased by extrapolation
  • Different amounts of one or more external influences on one or more cell types, tissues or organisms determine the amount of an external influence which, for example, inhibits cell growth by 50% (GIso value -> Growth Inhibition) [35].
  • the dose of an external influence is determined, in which apoptosis is triggered in 50% of the cells examined (ie value -> apoptosis induction) or the proliferation is inhibited by 50% (plso value - > Proliferation inhibition).
  • the database module of component 2 can contain data on the form of therapy, the active substance used, the dosage of the active substances, the tolerability or effect of the active substances used for therapy, the time period between the primary disease and the occurrence of Relapse or metastasis as well as one or more expression profiles of the examined tumors created with component 1 of the system. If disease patterns such as neurodegenerative syndromes, autoimmune diseases, cardiovascular diseases, viral infections or drug resistance are to be analyzed, the database module of component 2 is preferably data on the form of therapy that the active substance used, the dosage of the active substances, the tolerance or effect of the active substances used and one or more expression profiles of diagnostically relevant tissue samples created with component 1 of the system.
  • the analysis and interpretation of the expression data created with component 1 is carried out on two levels using the database and analysis modules contained in component 2.
  • each mRNA variant identified and quantified with the help of component 1 is assigned a translation efficiency.
  • the complete expression profile created with component 1 is compared with other expression profiles contained in the database of component 2 and assigned to a specific expression type. This assignment to a specific expression type enables the determination of the translation efficiency of all mRNA variants identified and quantified at interpretation level 1 as a function of cellular factors, as well as the identification of the mRNA pre-tentatively translated in the examined cell type, tissue or organism.
  • the measured values which are required to predict the amount of one or more proteins present in a cell type, tissue or organism to be examined include the total transcription rate of the mRNA variants coding for one or more specific proteins, and the transcription rate of the individual mRNA coding for these proteins -Variants and are determined with component 1 of the system (DNA array).
  • the transcription rate of one or more specific mRNAs is determined on the basis of the intensity of the hybridization signals in component 1 (DNA array) which are specific for the mRNA to be examined.
  • the intensity of the hybridization signals of mRNAs is measured, which are transcribed in all cell types, tissues or organisms (so-called housekeeping genes).
  • housekeeping genes used to normalize the hybridization signals must not be checked at the translation level.
  • Each Component 1 probe nucleic acid (DNA array) or each group of probe nucleic acids, which represents a specific mRNA variant, is assigned a data record which shows the translation efficiency of this mRNA variant in comparison with mRNA variants which are transcribed by the same and / or other genes , the dependence of the translation efficiency on cellular factors as well as the mRNA variant which is translated in a certain cell type, tissue or organism.
  • the comparison of an expression profile created by a tissue sample with the expression profiles contained in the database module of component 2 enables the examined sample to be assigned to a specific cell or tissue type and thus an assessment of the translation state of the examined cell type or tissue.
  • RNA-var.i ⁇ cell-type or tissue-specific translation efficiency
  • RNA-var.ix transcription rate 0 ⁇
  • Cprotx value which corresponds to the amount of the protein or proteins corresponding to the mRNA variants present in the tissue examined.
  • RNA Element Necessary and Sufficient for Transforming Growth Factor b- and p53-
  • Wood, K.V . "Firefly luciferase: a new tool for the molecular biologists", 1990,

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Proteomics, Peptides & Aminoacids (AREA)
  • Engineering & Computer Science (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Analytical Chemistry (AREA)
  • Zoology (AREA)
  • Wood Science & Technology (AREA)
  • Genetics & Genomics (AREA)
  • Hospice & Palliative Care (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Physics & Mathematics (AREA)
  • Oncology (AREA)
  • Biotechnology (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)

Abstract

La présente invention concerne un procédé d'analyse de l'expression de gènes qui permet d'effectuer une corrélation fiable de la quantité d'ARNm transcrite par un gène à analyser avec la quantité protéique résultant de la translation par cet ARNm, en prenant en considération l'état de translation dans un type de cellule, un tissu ou un organisme. La détermination de l'efficacité de translation de toutes les variantes d'ARNm transcrites par un gène à analyser qui codent pour une protéine donnée, permet entre autres l'identification de la variante d'ARNm résultant de la translation préférentielle dans un type de cellule, un tissu ou un organisme donné. La quantité et l'efficacité de translation de la variante d'ARNm résultant de la translation préférentielle, codant pour une protéine à analyser, permettent d'obtenir une prévision fiable de la quantité de protéine exprimée dans un type de cellule, un tissu ou un organisme.
EP02792796A 2001-11-29 2002-11-25 Procede d'analyse de l'expression de genes commandee par translation Withdrawn EP1453976A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10158517 2001-11-29
DE2001158517 DE10158517A1 (de) 2001-11-29 2001-11-29 Verfahren zur Analyse der translationskontrollierten Genexpression
PCT/EP2002/013214 WO2003046214A2 (fr) 2001-11-29 2002-11-25 Procede d'analyse de l'expression de genes commandee par translation

Publications (1)

Publication Number Publication Date
EP1453976A2 true EP1453976A2 (fr) 2004-09-08

Family

ID=7707347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02792796A Withdrawn EP1453976A2 (fr) 2001-11-29 2002-11-25 Procede d'analyse de l'expression de genes commandee par translation

Country Status (8)

Country Link
US (1) US20050037357A1 (fr)
EP (1) EP1453976A2 (fr)
JP (1) JP2005510247A (fr)
CN (1) CN1615369A (fr)
AU (1) AU2002358532A1 (fr)
CA (1) CA2468409A1 (fr)
DE (1) DE10158517A1 (fr)
WO (1) WO2003046214A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2507397A4 (fr) * 2009-12-01 2013-05-01 Compendia Bioscience Inc Classification des cancers
WO2012056440A1 (fr) * 2010-10-28 2012-05-03 Nanodoc Ltd. COMPOSITIONS ET PROCÉDÉS D'ACTIVATION DE L'EXPRESSION PAR UN miARN ENDOGÈNE SPÉCIFIQUE
CN112746083B (zh) * 2020-12-11 2023-08-11 中山大学 一种通过单碱基编辑靶基因启动子失活基因的方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5989811A (en) * 1994-09-29 1999-11-23 Urocor, Inc. Sextant core biopsy predictive mechanism for non-organ confined disease status
US5994526A (en) * 1996-06-21 1999-11-30 Plant Genetic Systems Gene expression in plants
US6368799B1 (en) * 1997-06-13 2002-04-09 Affymetrix, Inc. Method to detect gene polymorphisms and monitor allelic expression employing a probe array
US6306643B1 (en) * 1998-08-24 2001-10-23 Affymetrix, Inc. Methods of using an array of pooled probes in genetic analysis
CA2356946A1 (fr) * 1998-12-31 2000-07-06 Glenn Hoke Dispositif d'essai a sondes mixtes
DE10004102A1 (de) * 2000-01-31 2002-06-20 Metagen Pharmaceuticals Gmbh Nachweis von differenzieller Genexpression

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO03046214A3 *

Also Published As

Publication number Publication date
AU2002358532A1 (en) 2003-06-10
CA2468409A1 (fr) 2003-06-05
CN1615369A (zh) 2005-05-11
JP2005510247A (ja) 2005-04-21
WO2003046214A2 (fr) 2003-06-05
DE10158517A1 (de) 2003-06-12
US20050037357A1 (en) 2005-02-17
WO2003046214A3 (fr) 2004-04-01

Similar Documents

Publication Publication Date Title
US6821724B1 (en) Methods of genetic analysis using nucleic acid arrays
US20030104410A1 (en) Human microarray
US9181582B2 (en) Compositions for amplification of RNA sequences using composite primers
DE69833758T2 (de) Verfahren zur erkennung von genpolymorphismen und allelexpression unter verwendung von sondenchips
Brogan et al. Optical fiber-based sensors: application to chemical biology
US20070161031A1 (en) Functional arrays for high throughput characterization of gene expression regulatory elements
US20090069195A1 (en) Compositions and methods for array-based nucleic acid hybridization
US20070148690A1 (en) Analysis of gene expression profiles using sequential hybridization
DE60130763T2 (de) Signalamplifikation mit "lollipop"-hydridisierungsproben
JP2007525998A (ja) 脆弱ｘ症候群などのｓｔｒｐの検出
Lennon High-throughput gene expression analysis for drug discovery
WO2007078599A9 (fr) Réseaux fonctionnels pour la caractérisation à grande cadence d'éléments régulant l'expression génique
Muslimov et al. Spatial codes in dendritic BC1 RNA
US6316608B1 (en) Combined polynucleotide sequence as discrete assay endpoints
JP2003245072A (ja) シグナル伝達経路の決定
DE10155600A1 (de) Nukleinsäure-Array
US20030198983A1 (en) Methods of genetic analysis of human genes
US20030082584A1 (en) Enzymatic ligation-based identification of transcript expression
EP1453976A2 (fr) Procede d'analyse de l'expression de genes commandee par translation
Flavin et al. Nature of the accessible chromatin at a glucocorticoid-responsive enhancer
Lancaster et al. How affinity of the ELT-2 GATA factor binding to cis-acting regulatory sites controls Caenorhabditis elegans intestinal gene transcription
EP1412526A2 (fr) Detection amelioree et distinction de l'expression genique differentielle par la ligature et l'amplification de sondes
Barrett et al. High yields of RNA and DNA suitable for array analysis from cell sorter purified epithelial cell and tissue populations
US20030082596A1 (en) Methods of genetic analysis of probes: test3
JP2008514213A (ja) 遺伝子発現の分析のための改善された電気泳動分離方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20040518

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

17Q First examination report despatched

Effective date: 20061025

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20070306