EP1771577A2 - Procede permettant de determiner la frequence de sequences dans un echantillon - Google Patents

Procede permettant de determiner la frequence de sequences dans un echantillon

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Publication number
EP1771577A2
EP1771577A2 EP05776036A EP05776036A EP1771577A2 EP 1771577 A2 EP1771577 A2 EP 1771577A2 EP 05776036 A EP05776036 A EP 05776036A EP 05776036 A EP05776036 A EP 05776036A EP 1771577 A2 EP1771577 A2 EP 1771577A2
Authority
EP
European Patent Office
Prior art keywords
sample
sequence
frequency
predetermined sequence
amplification
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Withdrawn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
EP05776036A
Other languages
German (de)
English (en)
Inventor
Wolfgang Mann
Christoph Gauer
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.)
Beckman Coulter Inc
Original Assignee
Advalytix AG
Alopex 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 Advalytix AG, Alopex GmbH filed Critical Advalytix AG
Publication of EP1771577A2 publication Critical patent/EP1771577A2/fr
Withdrawn legal-status Critical Current

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    • 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
    • C12Q1/6813—Hybridisation assays
    • C12Q1/6827—Hybridisation assays for detection of mutation or polymorphism
    • 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
    • C12Q1/6844—Nucleic acid amplification reactions
    • C12Q1/6851—Quantitative amplification

Definitions

  • the present invention relates to a method for determining the frequency of a predetermined sequence or of several identical or nearly identical (homologous) sequences of the sample to the predetermined sequence.
  • Huntington Disease A particular subject (CAG) occurs in cascade in more than 37 copies. The predisposition to disease education increases with the number of repetitions of this 5 motive.
  • Other examples of unstable human trinuclide sequences are Kennedy syndrome or spinocerebral ataxia 1.
  • molecular diagnostics involves the quantification of sequence segments, ie, the number of times that a predetermined sequence is contained in a sample.
  • Chromosome-specific probe molecules for in / ⁇ t / hybridizations by FISH (fluorescence in situ hybridization) method are known from US 5,817,462. Through various combinations of different fluorophores all human chromosomes can be detected simultaneously.
  • the chromosomes to be analyzed are brought into contact with dye-labeled hybridization probes, so that sequence-complementary sections can be found. After the sequence-specific hybridization, a washing step follows and then the fluorescence signals of the cell are evaluated under a fluorescence microscope. If a fluorescence signal is present, the sequence is also present. It can e.g. be concluded on the presence of a complete chromosome. If no fluorescence signal is present, either the chromosome is missing or there is a microdeletion for the area of the probes.
  • FISH FISH, the number of copies of several different sequences within a genome can be determined in parallel today, which differ in the evaluation by the fluorescent dye used. The number is limited by the number of simultaneously usable fluorescent dyes. Typically, cell populations are examined that all have the same genetic status.
  • CGH comparative genomic hybridization
  • WO 00/24925 Karyotyping Means and Methods
  • a patient DNA is labeled with a fluorescent dye (eg red)
  • a reference DNA with a second dye (eg green).
  • Equal amounts of the various DNA populations are mixed and hybridized against a chromosome spread on a glass surface. Complementary strands will compete for the attachment sites on the chromosome sections. If the sequence segments in patient DNA and reference DNA are the same, a ratio of 1: 1 between green and red will be established at the corresponding hybridization site of the chromosome.
  • a particular embodiment of the method is the matrix CGH (chip or array format), in which instead of a chromosome spread, the gene sections are present in the form of discrete measurement points of a DNA array. Again, an intensity comparison of two hybridization signals is made.
  • the sample For the CGH, the sample must either be amplified (e.g., by PCR) or a multiplicity of nominally identical cells must be present.
  • the quantitative real-time PCR method is in principle suitable for detecting the smallest amounts of nucleic acids (in principle a copy of a
  • Endocrinol. 103: 150-155 The method is used for routine diagnostics. However, the amount of starting material can not be reduced arbitrarily, since with a few starting molecules (10-100) than
  • US Pat. No. 6,440,706 B1 discloses a method for determining the relative frequency of the sequences in a sample, which is referred to as digital amplification or digital PCR.
  • the sample is diluted to such an extent and distributed over a large number of reaction vessels that no more than a single molecule of one of the sequences to be investigated is present in a reaction vessel.
  • the sample distributed over several reaction vessels is then filled with several primers amplified, wherein the primers are each specific for one of the sequences and are provided with a specific marker. After amplification, the marker incorporated in the amplificate detects in which reaction vessel which of the sequences was present.
  • WO 2004/027089 Another method which makes it possible to determine the relative frequency of sequences is known from WO 2004/027089. For example, in this method, it should be determined whether one of several delineate subsets (i.e., separate nucleic acids or sequences) of a genetic material occurs more frequently or less frequently than the remaining delineatable subsets in a sample.
  • a specific embodiment of this prior art method involves determining the relative abundance of individual chromosomes in a cell, e.g. to determine if aneuploidy is present.
  • a single cell amplification e.g.
  • the invention has for its object to provide a method for determining the frequency of a predetermined sequence or identical or nearly identical (homologous) sequences to the predetermined sequence of a sample that is reliably, simply and inexpensively executable even with a small number of sequences of the sample ,
  • the method according to the invention for determining the frequency of a predetermined sequence or identical or nearly identical (homologous) sequences in a sample comprises the following steps: - carrying out one or more amplification reactions, with which several target sections of the sequence or sequences of the sample can be amplified to an amplificate Detecting whether certain target sections of the sequence of the sample have been amplified, and Determining the frequency of the sequence (s) in the sample on the basis of
  • This method of determining the frequency n of a predetermined sequence or sequences identical or nearly identical to the predetermined sequence in a sample comprises the steps of:
  • Amplification reactions is dependent on the frequency n of the predetermined sequence in the sample
  • step (d) detecting the amplified target portions from step (c) and determining the number of successful amplification reactions; (e) determining the frequency n of the predetermined sequence contained in the sample.
  • the frequency n of the predetermined sequence contained in the sample is performed by comparison with one or more controls in which the predetermined sequence exists at a known frequency.
  • the controls may be either controls in parallel with the method of the present invention using the same reaction conditions for the parallel control samples as for carrying out the amplification reaction (s) with the sample. It is also possible to subject the control samples, independently of the sample, to a method according to the invention and to create validated data or reference data which serve as controls for the comparison with the sample.
  • multiple targeting portions of the original sequences can be amplified by using multiple primer pairs or combinations of primers, each specific for a particular target portion or a few particular target portions of the sequence, or using primers specific for a variety of particular target portions.
  • primer includes not only single primers but also primer pairs (ie, each a forward and a second primer) a reverse primer) and primer combinations (more than one each forward and reverse primer for a particular target segment).
  • PCR methods employing a plurality of particular target amplifying primers are referred to as IRS-PCR (Inter-Repetitive Sequence-PCR) and WGA-PCR (Whole-Genome-Amplification-PCR), i. the primers are nonspecific in that they amplify a variety of different sequences.
  • the inventors of the present invention have found that in amplifying a plurality of different distinct target portions of a sequence, the number of amplified different target portions depends on the number of sequences originally present in the sample. The smaller the number of sequences present in the sample, the lower the number of different target sections amplified therefrom.
  • each amplification has a certain likelihood, that is, that each amplification is not performed with absolute certainty.
  • a competition between the amplification reactions of the individual different sections such that, if only one or a few of the predetermined sequences are present in the sample material, less of the individual different sections will be amplified than if a large number of sequences were to be amplified ,
  • the efficiency depends on a variety of factors, for example the choice of primers, the length of the sequence to be amplified and the other reaction conditions, e.g. in a PCR the
  • the efficiency of the amplification should be set to an intermediate value , eg in the range of 0.1 to 0.9, preferably 0.2 to 0.8, preferably 0.3 to 0.7, preferably 0.4 to 0.6 and most preferably about 0.5.
  • the efficiency of the amplification should be within a range that provides a statistically significant indication of the absolute quantity of sequences originally present, i. Nucleic acid molecules, can be made.
  • the invention's suitable amplification is typically in the range of 0.5 to 1.
  • the actual probability of amplification of a particular segment with a small number of start copies of the sequence depends on the amount of starting material, i. the number of predetermined sequences in the sample, and can basically cover the entire possible range of 0 to 1.
  • the original templates i. the original sequence from which the target segments are to be amplified is present only in low copy numbers, e.g. in the range of 0, 1, 2, 3,
  • each amplification reaction has a certain probability of error, it is very difficult to distinguish between different samples containing different numbers of templates for the amplification reactions using prior art methods.
  • a sample may contain two sequences from which particular target portions are to be amplified, and a second sample may contain three of these sequences from which certain target portions are to be amplified. It has not hitherto been possible with amplification methods of the prior art, based on the results of the amplification reactions, to deduce the number of original templates, ie the frequency of the sequences originally present in a sample, if the numbers are in this small range.
  • n is in the range of 0-100, preferably 0-30, preferably 0-10, preferably 0-5.
  • the method of the present invention thus provides a quantitative indication of the copy number of the sequence present in a sample.
  • amplification reactions are carried out to several different target segments on the sequence to amplify an amplificate. If the predetermined sequence from which the plural target portions are to be amplified is present in only a very small copy number, and the amplification efficiency is less than 1, there is a high probability that not all of the selected target portions will actually be amplified in the amplification reaction, even if this is done over several cycles.
  • n 0 98 2 0 0 0 0 0 0 0 0 0 0 0
  • n 1 2 13 24 57 3 1 0 0 0 0
  • n 2 0 0 0 0 3 40 35 20 2
  • n 0 95 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  • n 1 0 0 3 20 44 30 3 0 0 0 0 0 0 0 0 0
  • n 0 98 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  • n 1 0 1 14 22 40 20 3 0 0 0 0 0 0 0 0 0 0
  • n 2 0 0 0 0 0 0 3 10 30 32 15 7 3
  • the goal of the optimization of the counting method according to the invention is a safe To distinguish the copy numbers n in the desired area.
  • the PCR conditions and, if appropriate, the primers must be optimized accordingly.
  • the parameters obtained can then be added to the kit according to the invention and serve the user to interpret his results.
  • Table 4 shows how the statistical certainty of the statement increases as the number of independently examined results is increased. A normal distribution is used:
  • the method according to the invention is therefore also particularly suitable for determining the frequency of a small number of sequences, the number of which is preferably in the range from 0 to 10.
  • the number of independent PCR reactions m and the PCR conditions can be set such that the reliability of the result is optimized to the expected number of sequences.
  • the sample material Preferably, only the genome of a single cell is used as the sample material, it being possible with the method according to the invention to determine with certainty whether the predetermined sequence is absent or present once or twice or three times or four times or five times etc.
  • the method according to the invention is also particularly suitable for polar body analysis.
  • the predetermined sequence may e.g. It may also be a fragment of a chromosome or part of a chromosome. However, the predetermined sequence may also be a gene or a larger sequence segment.
  • the method according to the invention can be used for any kind of nucleic acids and nucleic acid sequences, e.g. also for plasmids and other artificial sequences. The embodiments described below by way of example are therefore not to be construed restrictively, but they are suitable for any of quantitative detection of nucleic acid sequences in small numbers in the original sample.
  • the nucleic acid sequence may be a DNA, RNA, mRNA, cDNA or genomic DNA.
  • the method according to the invention is suitable for determining the number of chromosomes in a single cell, ie the method is useful for detecting the presence of aneuploidy.
  • the method according to the invention can be carried out in several embodiments.
  • a single cell amplification is carried out with specific primers. It is not necessary in this case to first connect the cell to a WGA, i. to undergo a non-specific amplification.
  • a WGA is first performed to nonspecifically amplify the nucleic acid material of a single cell or a few cells. Subsequently, the specific amplification according to claim 1 is carried out. Also in these series-connected two amplification reactions, e.g. PCRs, the number of amplicons depends on the number of copies of the sequences to be counted originally in the sample. Tables are then determined experimentally for the overall process analogous to Tables 1 to 3, and based on this, the user can deduce the copy number from his samples. Here, too, a certain probability distribution arises for the presence or absence of the amplificates.
  • the cell is subjected to an amplification reaction with specific primers or corresponding primer pairs / primer combinations, the primers or pairs of primers being selected so that a number of specific and specific target segments can be amplified for each chromosome.
  • the number m of the target portions to be amplified is preferably at least 4, more preferably at least 6, more preferably at least 8. More target portions may also be selected per chromosome, eg 10, 12, 14, 16, 20, 30 or even more , Here, however, it is up to the skilled person to select an appropriate number of target sequences per chromosome.
  • the number m of target sequences specific to each chromosome should be large enough to be statistically distributed the successful and unsuccessful amplification reactions at the end of a statement can be made about the originally present numbers of template molecules.
  • the numbers of specific target sections per chromosome m should not be too high, so that the number of primers or primer pairs used does not exceed a reasonable level.
  • the person skilled in the art can itself select the number m of target sections to be amplified per chromosome, depending on the analysis and amplification method, and also determine the corresponding amplification conditions.
  • control experiments are performed wherein the control samples are selected from each cell having a known number n of nucleic acid molecules, e.g. a cell in which the nucleic acid is not present at all, as control 0, a cell in which the nucleic acid is once present, as control 1, etc.
  • This first embodiment of the present invention is particularly suitable for detecting chromosomal numbers in individual cells.
  • the method is suitable for Polismechen analyses, wherein a Polianuchen can have a haploid or diploid chromosome set.
  • a Polianuchen can have a haploid or diploid chromosome set.
  • Each of the target segments preferably occurs only once on a particular chromosome and is thus specific.
  • the amplification reactions do not always yield an amplificate, ie that some of the m target segments per chromosome are not amplified and are subsequently undetectable.
  • the conditions may be adjusted such that, if only one chromosome is present, only four of the eight target segments of the particular chromosome will be amplified (by statistical means). As a result, this means that subsequent detection with appropriate probes gives a result of 4/8. Having previously set the amplification efficiency to a value of 0.5 using control samples, one can conclude from the conclusion 4/8 that the chromosome was simply present in the sample.
  • Example 1 can be used to examine whether a polar body contains chromosome 2 once or twice. The question of whether chromosomes are present once or twice in a polar body is for the
  • the method according to the invention is particularly suitable for determining the frequency or counting of a small number of a predetermined sequence, e.g. less than 20, less than 10, preferably less than 5 or 3, since the statistical spread of the number of successfully amplified sequence sections is particularly pronounced with a small number of predetermined sequences in the sample.
  • a predetermined sequence e.g. less than 20, less than 10, preferably less than 5 or 3, since the statistical spread of the number of successfully amplified sequence sections is particularly pronounced with a small number of predetermined sequences in the sample.
  • Example 1 the ⁇ 2 test is used as the statistical method Service.
  • other statistical methods are also suitable for evaluating the amplification results, such as mean comparison (t-test, F-test), variance analysis methods (ANOVA, MANOVA), multi-field ⁇ 2 tests or hierarchical loglinear methods.
  • amplification conditions based on statistical distribution of control samples of known numbers n of starting nucleic acids (templates) such that, due to the statistical distribution of positive i. successful, and negative, i. unsuccessful in inferring amplification reactions from the number of amplified target segments compared to the number (m) of preselected target segments on the number (n) of nucleic acids originally present.
  • the frequency tables (Tables 1, 2, 3) then refer to the combination of the two amplifications.
  • Example 1 An example of this second embodiment is given in Example 1.
  • any amplification method is suitable for amplifying the sample with which several different predetermined sections of a sequence to be detected are amplified.
  • a single primer as in Example 1 can be used.
  • the amplicons may e.g. be analyzed by electrophoresis, a hybridization analysis on a DNA array, a bead system or other optical measurement, electrical measurement or electrochemical measurement.
  • the methods 1-3 can also be carried out with a few nominally identical cells, the number of which is preferably known, e.g. ⁇ 10.
  • a WGA amplification is performed, which corresponds to the WGA amplification of the embodiment described above.
  • Such single cell amplification is also referred to as statistical amplification.
  • the sections are detected without further amplification by complex hybridization.
  • a complex hybridization is understood to mean a process in which several probes are present at the same time, as is the case with DNA arrays or bead systems.
  • a multiplex PCR is performed. This is a PCR with several specific primer pairs that are run simultaneously in a reaction vessel. With each primer pair, preferably exactly one segment of the sequence is amplified. With such a multiplex PCR, it is expedient to amplify two to ten portions simultaneously. With a larger number of sections problems arise because then the amplifications are too unspecific.
  • Variant 4 summarizes the information about the genetic material of some nominally identical cells in a sample.
  • the genetic material of some nominally identical cells is first investigated independently of each other in different reaction vessels with a specific PCR that amplifies exactly one section. Thereafter, the sections are detected without further amplification (variant 5) or with further amplification (variant 6).
  • the method of the present invention is particularly suitable for analyzing the genome of a single cell (e.g., a polar body, fetal maternal fetal cells, etc.).
  • the frequency of a predetermined sequence in a sample can be determined.
  • the predetermined sequence may be multiple in separate molecules in the sample. However, it can also be formed several times on a strand.
  • the method according to the invention can thus count a predetermined sequence which occurs several times on a strand as well as a predetermined sequence which is present in the form of separate molecules.
  • the sequence to be determined only has to be sufficiently long so that several sections can be amplified independently of one another.
  • the length of the predetermined sequence is at least 100 bases, preferably a few 100 bases.
  • the frequencies of several different predetermined sequences can be determined at the same time, whereby here too the different sequences can be formed on different strands or on the same strand. On the same strand, the different sequences may overlap.
  • relative frequencies of a predetermined sequence of different samples can be determined.
  • the method according to the invention can also be validated by a series of experiments such that the frequency of the presence or absence of the particular sections in the amplificate permits a statement about the absolute number of predetermined sequences of a sample.
  • the method of the invention can be used to determine the frequency of sequences that are on a common strand, as well as to determine the frequency of sequences that are on different strands.
  • the sequences should only have a sufficient length that different sections can be addressed by primers.
  • Another object of the invention is a kit for carrying out the method according to the invention, comprising
  • the kit may further comprise one or more nonspecific primers with which the predetermined sequence can be nonspecifically amplified according to a predetermined protocol.
  • the results of the control amplification experiments may be in the form of stored data, or printed materials may be added to the kit from which the user can read the results and compare them with his own results from real samples.
  • the method according to the invention can also be carried out in a small space, e.g. on a solid support, chip or slide or the like. Also in multiwell plates, e.g. Microtiter plates, the procedure can be performed.
  • the solid support is preferably a slide, a CD or other solid support used for DNA array formats.
  • the device preferably contains a device for detecting nucleic acids which have been "captured" with labeled probes, ie, for example, a device for detecting fluorescence or colorimetric measuring methods
  • the device also comprises either stored data, which serve as comparison data, to obtain the results from the Amplification can be assigned to the control data in such a way that the comparison makes it possible to determine the absolute number of predetermined sequences originally contained in a sample
  • the device additionally or alternatively
  • Figure 1 is a table showing the results of a first example
  • FIGS. 2a, 2b show illustrations of an electrophoresis examination for detecting the predetermined sections.
  • Figure 3 shows a comparison of the presence or absence of chromosomes for 7 cell lines from Coriell on the one hand and according to the method of the invention on the other hand.
  • Transparent boxes Chromosomes present (results of the methods are the same).
  • Hatched boxes Chromosomes not present (results of methods match).
  • Dotted boxes Method according to the invention shows the presence of a chromosome, not the other methods.
  • Black boxes Method according to the invention shows the absence of the chromosome, the other methods the presence.
  • FIG. 4 shows the result of a FISH analysis of a human ovum with a hybridization kit from Vysis.
  • FIG. 5 shows the image analysis of a scan with the program "TIFF Analyzer”.
  • a single cell WGA PCR is designed to amplify the genetic material of a single cell or a few cells.
  • Single-cell WGA-PCR is performed on a slide, with 1 ⁇ l of PCR mix and 5 ⁇ l of mineral oil added to the samples.
  • 25 ⁇ l of PCR mix are composed as follows: 19.125 ⁇ l ampoule water 2.5 ⁇ l MgCl 2 (25 mM)
  • the AIeI primer has the following sequence:
  • PCR mixtures each consisting of one sample, the PCR mix and the oil film, were cycled with the following PCR conditions:
  • the PCR product was transferred to 20 ⁇ l of TE buffer. 2 ⁇ l of it were on analyzed polyacrylamide gel, 15 .mu.l were amplified with a marker PCR. The rest was frozen at -20 0 C.
  • Marker PCR was used to detect whether certain portions of the samples had been amplified with single cell WGA PCR.
  • primer pairs were placed in microtiter plate reaction vessels and the remaining PCR mixture was pipetted. To demonstrate the sections that were amplified from chromosome 2 in single-cell PCR, the following eight primer pairs were used:
  • SHGC-62010 ⁇ '-AAGGTTTATAATGGAAACACTG-S ' ⁇ '-TGAGTTCTGGAATTCATTACATA-S'
  • FIGS. 2a and 2b show the corresponding images of the electrophoresis study on polyacrylamide gel.
  • FIGS. 2a and 2b The corresponding images of the electrophoresis study on polyacrylamide gel are shown in FIGS. 2a and 2b, FIG. 2a showing the bands of sample 1 and FIG. 2b the bands of sample 2.
  • sample 1 has two positive amplificates.
  • the remaining six other amplificates are negative, that is, only two of the portions of chromosome 2 predetermined by the selection of the primers of the marker PCR have been amplified by single cell PCR.
  • Eight positive amplificates were detected, i.e., all eight predetermined portions were amplified with single cell PCR.
  • the results are summarized in FIG.
  • Example 1 shows very impressively the effect that with a smaller number of predetermined sequences (in this case: chromosome 2 of sample 1) in a sample, fewer portions of the sequence are amplified than at a higher number of predetermined sequences (here: chromosome 2 of sample 2) in a sample.
  • ⁇ 2 test also: Chi-Square Test
  • the absolute number of chromosome 2 in a sample can be determined on the basis of the statistical data thus determined on the basis of the frequency of the presence or absence of the particular sections in the amplificate .
  • the influence of the thresholds described above must be considered. If the threshold is set high, there will be less positive amplifications of the sections, whereas at a low threshold there will be several positive amplifications.
  • the cell lines were tested for the presence or absence of certain chromosomes.
  • the cell lines were obtained from Coriell.
  • the cells obtained from Coriell have already been tested by Coriell himself for the presence or absence of certain chromosomes.
  • the cells were also tested by the method according to the invention.
  • the result is shown in FIG.
  • the DNA of the cells is delivered and, according to the packing slip, contains a specific panel of human chromosomes.
  • Coriell can still be a test result from the Web page of Coriell be fetched, which is based on a blotting test. Why the company makes two statements is not known. Obviously, the blotting test is sensitive enough to detect chromosomes that are present in only a fraction of the cells.
  • the third line of FIG. 3 shows the result of the chip in each case.
  • the 25 ⁇ l PCR batch was purified (PCR Purification Kit Macherey & Nagel) and taken up in 250 ⁇ l elution buffer. Of these, 1 ⁇ l was added to each anchor of a chip supplied with Master Mix.
  • the first polar body contains 2 copies of a sequence
  • the mature ovum and the second polar body each contain a copy of a sequence.
  • the following distributions are possible (partly mis-distributions): mature ovum contains 4 copies ⁇ r >> polar bodies do not contain a copy mature egg cell contains 3 copies ⁇ r >> polar bodies contain a copy mature ovum contains 2 copies ⁇ • ⁇ * polar bodies contain 2 copies mature ovum contains 1 copy ⁇ r ⁇ * Polar body contains 3 copies Mature ovum does not contain a copy ⁇ r " ⁇ Polar bodies contain 4 copies
  • the example examines corresponding polar bodies and oocytes. If fluorescence in situ hybridization (FISH) shows 4 correct signals, no sequence may be detectable in the polar bodies. If the FISH shows 3 or fewer signals, the method according to the invention must be positive (the polar bodies contain at least one copy).
  • FISH fluorescence in situ hybridization
  • the following experiment shows the correspondence of the chip results to an established FISH method.
  • the processing of the single cell and the FISH hybridization is carried out according to the protocol of the company Vysis, which is enclosed with each kit.
  • the polar body amplificate is analyzed for the presence / absence of all chromosomes after Whole Genome Amplification.
  • the experimental procedure is described above in Examples 1 and 2.
  • the PCR conditions and components are as in Example 2, but the template (DNA) is replaced by polar bodies, which are located on the chip as templates.
  • the corresponding first polar body accordingly contains no chromosome 16. This can be shown by the chip.

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Abstract

Procédé permettant de déterminer la fréquence d'une séquence prédéterminée ou de plusieurs séquences identiques ou presque identiques à la séquence prédéterminée dans un échantillon. Ledit procédé consiste à effectuer une ou plusieurs réactions d'amplification grâce auxquelles plusieurs segments différents de la séquence ou des séquences de l'échantillon peuvent être amplifiées pour obtenir un produit d'amplification, à détecter si des segments différents déterminés de la séquence de la sonde ont été amplifiés et à déterminer le nombre de la (des) séquence(s) dans la sonde à l'aide de la fréquence de présence ou d'absence des segments différents déterminés dans le produit d'amplification.
EP05776036A 2004-07-27 2005-07-27 Procede permettant de determiner la frequence de sequences dans un echantillon Withdrawn EP1771577A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004036285A DE102004036285A1 (de) 2004-07-27 2004-07-27 Verfahren zum Bestimmen der Häufigkeit von Sequenzen einer Probe
PCT/EP2005/008156 WO2006010610A2 (fr) 2004-07-27 2005-07-27 Procede permettant de determiner la frequence de sequences dans un echantillon

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EP1771577A2 true EP1771577A2 (fr) 2007-04-11

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CA2574832A1 (fr) 2006-02-02
DE102004036285A1 (de) 2006-02-16
CN1997757A (zh) 2007-07-11
JP2008507963A (ja) 2008-03-21
WO2006010610A2 (fr) 2006-02-02
US20080193927A1 (en) 2008-08-14
WO2006010610A3 (fr) 2006-06-22

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