WO1999033998A2 - Regulatorische dna-sequenzen des gens der humanen katalytischen telomerase-untereinheit und deren diagnostische und therapeutische verwendung - Google Patents
Regulatorische dna-sequenzen des gens der humanen katalytischen telomerase-untereinheit und deren diagnostische und therapeutische verwendung Download PDFInfo
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- WO1999033998A2 WO1999033998A2 PCT/EP1998/008216 EP9808216W WO9933998A2 WO 1999033998 A2 WO1999033998 A2 WO 1999033998A2 EP 9808216 W EP9808216 W EP 9808216W WO 9933998 A2 WO9933998 A2 WO 9933998A2
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- dna
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- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/12—Transferases (2.) transferring phosphorus containing groups, e.g. kinases (2.7)
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- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K2217/00—Genetically modified animals
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Definitions
- telomeres The genetic material of eukaryotic cells is distributed on linear chromosomes.
- the ends of the genes are derived from the Greek words telos (end) and meros (part, segment) as telomeres.
- Most telomeres consist of repetitions of short sequences that are mostly composed of
- telomeres are built up from the sequence TTAGGG (Meyne et al, 1989).
- telomeres perform various important functions. They prevent the fusion of chromosomes (McClintock, 1941) and thus the development of dicentric inheritance. Such chromosomes with two centromeres can lead to the development of cancer by loss of heterozygosity or doubling or loss of genes.
- telomeres serve to distinguish intact hereditary systems from damaged ones. For example, yeast cells stopped dividing when they contained a chromosome without telomer (Sandeil and Zakian, 1993).
- RNA primers are required to initiate DNA replication. After cleavage of the RNA primer, extension of the Okazaki fragments and subsequent ligation, the newly synthesized DNA is missing
- telomeres also play an important role in regulating cellular aging (Olovnikov, 1973). Human somatic cells show a limited replication capacity in culture; after a certain time they become senese. In this state, the cells no longer divide even after stimulation with growth factors, but do not die, but remain metabolically active (Goldstein,
- telomeres have central functions in the aging of cells and the stabilization of genetic material and prevention of cancer.
- telomeres synthesize the telomeres
- telomere As described above, organisms with linear chromosomes can only partially replicate their genome without a special protective mechanism. Most eukaryotes use a special enzyme, telomerase, to regenerate the telomer sequences. Telomerase is constitutively expressed in the unicellular organisms examined so far. In contrast, telomerase activity was only measured in germ cells and tumor cells in humans, whereas neighboring somatic tissue contained no telomerase (Kim et al, 1994).
- the telomerase can also be referred to as terminal telomer transferase, which is located as a multiprotein complex in the cell nucleus.
- telomere telomerase The proportion of human telomerase has long been known (Feng et al, 1995), The catalytic subunit of this enzyme group was recently identified in various organisms (Lingner et al, 1997; see our co-pending application PCT EP / 98/03468). These catalytic subunits of telomerase are strikingly homologous both to each other and to all known reverse transcriptases.
- WO 98/14592 also describes nucleic acid and amino acid sequences of the catalytic telomerase subunit.
- telomere activity was originally only detectable in germline cells, but not in normal somatic cells (Hastie et al., 1990; Kim et al., 1994). After developing a more sensitive detection method (Kim et al, 1994), low telomerase activity was also detected in hematopoieu cells (Broccoli et al, 1995; Counter et al, 1995; Hiyama et al, 1995). However, these cells still showed a reduction in telomeres (Vaziri et al, 1994; Counter et al, 1995). It has not yet been clarified whether the amount of enzyme in these cells is not sufficient to compensate for the loss of telomeres. or whether the measured telomerase activity stems from a subpopulation, for example incompletely differentiated CD34 + 38 + precursor cells (Hiyama et al, 1995). Evidence of telomerase activity in a single cell would be required for clarification.
- telomerase hypothesis combines the loss of telomer sequences and cell aging with the activity of telomerase and the development of cancer.
- shrinking of telomeres can be seen as a mechanism for tumor suppression. Differentiated cells that do not contain telomerase stop their cell division at a certain length of the telomeres.
- telomere shortening is probably the main mechanism of tumor cells to stabilize their telomeres.
- telomerase inhibition should allow therapy of tumors.
- Conventional cancer therapies with cytostatics or short-wave radiation damage not only the tumor cells, but all the cells that divide in the body. But apart from tumor cells only
- telomere inhibitors would attack the tumor cells more specifically and thus cause fewer undesirable side effects. Telomerase activity has been demonstrated in all tumor tissues tested so far, so that these therapeutic agents could be used against all types of cancer. The effect of telomerase inhibitors would occur when the telomeres of the cells have shortened to such an extent that the genome becomes unstable. Since tumor cells usually have shorter telomeres than normal somatic cells, cancer cells would first be eliminated by telomerase inhibitors. Cells with long telomeres, like the germ cells, would only be damaged much later. Telomerase inhibitors are therefore a pioneering way of treating cancer. Clear answers to the question of the type and target of physiological telomerase inhibitors will be possible if the regulation of the gene expression of telomerase is also identified.
- Eukaryotic gene expression i.e. the cellular flow of information from DNA via RNA to protein has a variety of starting points for regulatory mechanisms. Individual control levels are e.g. gene amplification, recombination of gene loci, chromatin structure, DNA methylation, transcription, post-transcriptional mRNA modifications, mRNA transport, translation and post-translational protein modifications. According to previous studies, control at the level of transcription initiation is of the greatest importance (Latchman, 1991).
- RNA polymerase II RNA polymerase II RNA polymerase II RNA polymerase II RNA polymerase II .
- a comparison of the nucleotide sequences of promoter regions of many known genes shows that certain sequence motifs occur frequently in this region. These elements include the TATA box, the CCAAT box and the GC box, which are recognized by specific proteins.
- the TATA box located about 30 nucleotides upstream from the start of transcription, is e.g. recognized by the TFIID subunit TBP (“TATA box binding protein”), whereas certain GC-rich sequence sections are specifically bound by the transcription factor Spl (“specificity protein 1”).
- the constitutive control area includes the so-called core promoter, which enables the correct initiation of the transcription. It contains the UPE's (upstream promoter elements). written sequence elements that are necessary for efficient transl ription.
- the regulatory control sections which may be intertwined with the UPE's, have sequence elements which may be involved in the signal-dependent regulation of transcription by hormones, growth factors, etc. They combine tissue or cell-specific promoter properties.
- a characteristic feature of eukaryotic genes are DNA segments that can influence gene expression over comparatively large distances. These elements can be located upstream, downstream or within a transcription unit and, regardless of their orientation, theirs
- sequence segments can increase (weaken) the promoter activity (enhancer) or (silencer). Similar to the promoter regions, enhancers and silencers harbor several binding sites for transcription factors.
- the invention relates to the DNA sequences from the 5 'flanking region of the gene of the catalytically active human telomerase subunit and intron sequences for this gene.
- the invention particularly relates to the 5 'flanking regulatory DNA
- the invention further relates to regulatory regions of the 5'-flanking regulatory DNA sequence according to FIG. 4 (SEQ ID NO 1).
- the present invention furthermore relates to intron sequences for the gene of the human catalytic telomerase subunit, in particular those which have a regulatory effect.
- the intron sequences according to the invention are described in detail in the context of Example 5 (cf. SEQ ID NO 4, 5, 6, 7, 8, 9, 10,
- the invention further relates to a recombinant construct which contains the DNA sequences according to the invention, in particular the 5 '-flanking DNA sequence of the gene of the human catalytic telomerase subunit or partial regions thereof.
- Recombinant constructs which, in addition to the DNA sequences according to the invention, in particular the 5 ′ -flanking DNA sequence of the gene of the human catalytic telomerase subunit or partial regions thereof, contain one or more further DNA sequences which code for polypeptides or proteins.
- these further DNA sequences code for antitumor proteins.
- antitumor proteins are those which directly or indirectly inhibit angiogenesis. These proteins include, for example:
- Plasminogen activator inhibitor PAI-1
- PAI-2 PAI-2
- PAI-3 angiostatin
- endostatin endostatin
- platelet factor 4 TIMP-1
- TIMP-2 TIMP-2
- TIMP-3 leukemia inhibitory factor 4
- Antitumor proteins which have a cytostatic effect on tumors directly or indirectly are also particularly preferred. These include in particular:
- Tumor suppressor genes e.g. p53, retinoblastoma.
- antitumor proteins which optionally stimulate inflammation in addition to the antitumor effect and thereby to
- Eliminate tumor cells include, for example: RANTES, Monocyte chemotactic and activating factor (MCAF), IL-8, Macrophage inflammatory protein (MIP-l ⁇ , -ß), Neutrophil activating protein-2 (NAP-2), IL-3, IL-5, human leukemia inhibitory factor (LIF), IL-7, IL-11, IL-13, GM-CSF, G-CSF, M-CSF.
- RANTES Monocyte chemotactic and activating factor
- MIP-l ⁇ , -ß Macrophage inflammatory protein
- NAP-2 Neutrophil activating protein-2
- IL-3 IL-5
- LIF human leukemia inhibitory factor
- IL-7 IL-11
- IL-13 GM-CSF
- G-CSF G-CSF
- M-CSF M-CSF
- antitumor proteins which, because of their action as enzymes, are able to convert precursors of an antitumor agent into an antitumor agent.
- enzymes include, for example:
- Catalase or phosphatase human alkaline phosphatase, type 5 acid phosphatase, human lysooxidase, human acid D-aminooxidase, human glutathione peroxidase, human eosinophil peroxidase, human thyroid peroxidase.
- the above-mentioned recombinant constructs can also contain DNA sequences which code for factor VIII, IX or partial fragments thereof. These DNA sequences also include other blood coagulation factors
- reporter proteins include, for example:
- Chloramphenicol acetyl transferase CAT
- LOC firefly luciferase
- ß-galactosidase ß-gal
- SEAP secreted alkaline phosphatase
- hGH human growth hormone
- GUS ß-glucuronidase
- GFP GFP and all variants derived from it, Aquarin, Obelin.
- Recombinant constructs according to the invention can also contain DNA coding for the human catalytic telomerase subunit and its variants and fragments in an antisense orientation.
- these constructs can also other protein subunits of human telomerase and the telomerase RNA
- Component in antisense orientation included.
- the recombinant constructs can also contain other protein subunits of human telomerase and the telomerase RNA
- the invention further relates to a vector containing the above-mentioned DNA sequences according to the invention, in particular the 5 'flanking DNA sequences, and one or more of the above-mentioned other DNA sequences.
- a preferred vector for such constructs is a virus, for example a retrovirus, adenovirus, adeno-associated virus, herpes simplex virus, vaccina virus, lentiviral virus, Sindbis virus and a Semliki Forest virus.
- Plasmids are also preferred as vectors.
- the invention further relates to pharmaceutical preparations containing recombinant constructs or vectors according to the invention; for example, preparation in a colloidal dispersion system.
- Suitable colloidal dispersion systems are, for example, liposomes or polylysine ligands.
- Dispersion systems can be supplemented by a ligand that attaches to membrane structures. tures of tumor cells binds.
- a ligand can, for example, be linked to the construct or the vector or can also be part of the liposome structure.
- Suitable ligands are in particular polyclonal or monoclonal antibodies or antibody fragments thereof, which bind with their variable domains to membrane structures of tumor cells, or terminal mannose-carrying substances, cytokines, growth factors or fragments or partial sequences thereof which bind to receptors on tumor cells.
- Corresponding membrane structures are, for example, receptors for a cytokine or a growth factor, such as e.g. IL-1, EGF, PDGF, VEGF, TGF ß, insulin or insulin-like growth factor (ILGF), or adhesion molecules, such as. B. SLeX, LFA-1, MAC-1, LECAM-1 or VLA-4, or the mannose-6-phosphate receptor.
- a growth factor such as e.g. IL-1, EGF, PDGF, VEGF, TGF ß, insulin or insulin-like growth factor (ILGF), or adhesion molecules, such as. B. SLeX, LFA-1, MAC-1, LECAM-1 or VLA-4, or the mannose-6-phosphate receptor.
- the present invention includes pharmaceutical preparations which, in addition to the vector constructs according to the invention, can also contain non-toxic, inert, pharmaceutically suitable excipients.
- the application e.g. intravenously, intraarterially, intramuscularly, subcutaneously, intradermally, anal, vaginally, nasally, transdermally, intraperitoneally, as an aerosol or orally
- at the site of a tumor or the systematic application of these preparations are conceivable.
- the vector constructs according to the invention can be used in gene therapy.
- the invention further relates to a recombinant host cell, in particular a recombinant eukaryotic host cell, containing the constructs or vectors described above.
- the invention further relates to a method for identifying substances which have the promoter, silencer or enhancer activity of catalytic telomerase
- this method includes the following steps: A. Adding a candidate substance to a host cell containing the regulatory DNA sequence according to the invention, in particular the 5'-flanking regulatory DNA sequence for the gene of the human catalytic telomerase subunit or a regulatory region thereof, functionally linked to one Reporter gene,
- the procedure can be used to identify substances that
- Enhance promoter, silencer or enhancer activity of the catalytic telomerase subunit Enhance promoter, silencer or enhancer activity of the catalytic telomerase subunit.
- the method can also be used to identify substances which have the promoter, silencer or enhancer activity of the catalytic telomerase
- the invention further relates to a method for identifying factors which are specific to fragments of the DNA fragments according to the invention, in particular the 5 'flanking regulatory DNA sequence of the catalytic telomerase
- Subunit tie. This method involves screening an expression cDNA library with the above-described DNA sequence or partial fragments of different lengths as a probe.
- constructs or vectors described above can also be used for the production of transgenic animals.
- the invention further relates to a method for detecting telomerase-associated conditions in a patient, which comprises the following steps: A. Incubation of a construct or vector containing the DNA sequence according to the invention, in particular the 5 'flanking regulatory DNA sequence for the gene of the human catalytic telomerase subunit or a regulatory region thereof and a reporter gene with body fluids or cellular samples,
- telomerase-associated state indicates a pathogenic state.
- Fig. 1 Southern blot analysis with genomic DNA of different species
- Lane 1 contains Hind III cut ⁇ DNA as size markers (23.5, 9.4, 6.7, 4.4, 2.3, 2.0, and 0.6 kb). Lanes 2 through 10 contain human genomic DNA,
- FIG. B Autoradiogram of a Southern blot analysis corresponding to FIG. A, hybridized with a radioactively labeled approximately 720 bp long hTC cDNA probe.
- Fig. 2 Restriction analysis of the recombinant ⁇ DNA of the phage clone P12, which hybridizes with a probe from the 5 'region of the hTC cDNA.
- the picture shows a photo of an ethidium bromide stained 0.4%
- Lanes 1 and 2 contain Eco RI / Hind III cut ⁇ DNA or a 1 kb ladder from Gibco as a size marker. Lanes 3 - 7 contain 250 ng of DNA of the recombinant phage cut with Barn HI (lane 3), Eco RI (lane 4), Sal I (lane 5), Xho I (lane 6) and Sac I (lane 7). The arrows indicate the two ⁇ arms of the
- A The picture shows a photo of an 0.8% agarose gel stained with ethidium bromide. Lanes 1 and 15 contain a 1 kb ladder from Gibco as a size marker. Lanes 2 to 14 contain 250 ng cut ⁇ -DNA from the recombinant phage clone.
- the enzymes used were: Lane 2: Sac I, Lane 3: Xho I, Lane 4: Xho I, Xba I, Lane 5: Sac I, Xho I, Lane 6: Sal I, Xho I, Xba I, Lane 7: Sac I, Xho I, Xba I, lane 8: Sac I, Sal I, Xba I, lane 9: Sac I, Sal I, BamH I, lane 10: Sac I, Sal I, Xho I, lane 1 1: Not I, lane 12: Sma I, lane 13: empty, lane 14: not digested.
- Fig. B Autoradiogram of a Southern blot analysis corresponding to Fig. A. An approximately 420 bp long 5'-hTC cDNA fragment was used as a probe for the hybridization.
- Fig. 4 Partial DNA sequence of the 5 'flanking region and the promoter of the gene of the human catalytic telomerase subunit. The ATG start codon is highlighted in bold in the sequence. The sequence shown corresponds to SEQ ID NO 1.
- Fig. 5 Identification of the translation start by primer extension analysis.
- the figure shows an autoradiogram of a denaturing polyacrylamide gel, which was chosen to display a primer extension analysis.
- An oligonucleotide with the sequence was used as a primer
- the primer extension reaction was plotted in lane 1.
- Lanes G, A, T, C, represent the sequence reactions with the same primer and the corresponding dideoxynucleotides.
- the bold arrow indicates the main transcription start, the thin arrows indicate three secondary
- Fig. 6 cDNA sequence of the human catalytic telomerase subunit (hTC; see our pending application PCT / EP / 98/03468). The sequence shown corresponds to SEQ ID NO 2.
- Fig. 7 Structural organization and restriction map of the human hTC gene and its 5 'and 3' flanking region.
- Fig. 8 HTL splice variants.
- A Schematic structure of the hTC mRNA splice variants.
- the complete hTC mRNA is shown as a gray rectangle in the upper area of the figure.
- the 16 exons are shown according to their size.
- the translation start (ATG) and the stop codon, as well as the telomerase-specific T motif and the seven RT motifs are highlighted.
- the hTC variants are divided into deletion and insertion variants.
- the missing exon sequences are marked in the deletions.
- the insertions are highlighted by additional white rectangles.
- the size and origin of the inserted sequences are indicated. Newly created stop codons are marked.
- Variant INS2 is unknown.
- Exon sequences are shown in lower case or in upper case.
- the donor and acceptor sequences of the splice sites are highlighted as gray rectangles and their exon intron origin is also indicated.
- Fig. 9 Identification of the transcription start by RT-PCR analysis.
- the RT-PCR was carried out with cDNA library from HL 60 cells and genomic DNA as a positive control.
- a common 3 ' primer hybridizes to a sequence region from exon 1. The position of the different 5' primers in the coding region or the 5 ' flanking region is indicated. In the negative control there was none Template DNA added in the PCR reaction.
- M DNA size marker.
- Translation start codon ATG (+1) are shown.
- the putative region of the translation start is underlined.
- Possible regulatory sequence segments within the 4000 bp upstream of the translation start are outlined. The sequence shown corresponds to SEQ ID NO 3.
- Fig. 1 1 Activity of the hTC promoter in HEK-293 cells.
- the first 5000 bp of the 5'-flanking hTC gene region are shown schematically in the upper area of the figure.
- the ATG start codon is highlighted.
- CpG-rich islands are marked by gray rectangles.
- the sizes of the hTC promoter-luciferase constructs are shown on the left-hand side of the figure.
- the motorless pGL2-Basic construct and the SV40 promoter construct pGL2-Pro were used as controls in each transfection.
- the relative luciferase activity of the various promoter constructs in HEK cells is shown as a continuous bar on the right-hand side of the figure.
- DNA-binding factors eg transcription factors
- GCG Sequence Analysis program package from the "Genetics Computer Group” (Madison, USA).
- ghTC catalytic telomerase subunit
- 5 ' and 3 ' lying regions of this gene were cloned, the starting point of the transcription was determined, potential binding sites for DNA-binding proteins were identified and active promoter fragments were identified.
- the sequence of the hTC cDNA (FIG. 6) is already described in our application PCT / ⁇ P / 98/03468, which is also pending. If not mentioned separately, all information on the cDNA position relates to this sequence.
- a genomic Southern blot analysis determined whether ghTC represents a single gene in the human genome or whether there are multiple loci for the hTC gene or possibly also ghTC pseudogenes.
- a commercially available zoo blot from Clontech was subjected to a Southern blot analysis.
- This blot contains 4 ⁇ g Eco RI-cut genomic DNA from nine different species (human, monkey, rat, mouse, dog, cattle, rabbit, chicken and yeast). With the exception of yeast, chicken and
- Human DNA was isolated from kidney tissue. Human genomic DNA was isolated from placenta and chicken genomic DNA was purified from liver tissue. In the autoradiogram in FIG. 1, an approximately 720 bp long hTC cDNA fragment, isolated from the hTC cDNA, variant Del2 (positions 1685 to 2349 plus 2531 to 2590 of FIG. 6 [Deletion 2; cf. example 5 of Fig. 8]), used. The experimental conditions for the hybridization and the washing steps of the blot were based on Ausubel et al. (1987).
- the probe recognizes two specific DNA fragments.
- the smaller Eco RI fragment about 1.5 to 1.8 kb in length, is probably two Eco R1 cleavage back in an intron of ghTC DNA. Based on this result, it can be assumed that there is only one singular ghTC gene in the human genome.
- 5'-hTC cDNA fragment position 839 to 1345 of FIG. 6 hybridized.
- the nitrocellulose filters were first in 2 x SSC (0.3 M NaCl; 0.5 M Tris-HCl, pH 8.0) and then in a prehybridization solution (50% formamide; 5 x SSPE, pH 7.4; 5 x Denhards Solution; 0.25% SDS; 100 ⁇ g / ml herring sperm DNA) incubated at 42 ° C for two hours.
- SSC 0.3 M NaCl
- Tris-HCl pH 8.0
- a prehybridization solution 50% formamide; 5 x SSPE, pH 7.4; 5 x Denhards Solution; 0.25% SDS; 100 ⁇ g / ml herring sperm DNA
- the prehybridization solution was supplemented overnight with 1.5 ⁇ 10 6 cpm / ml solution of denatured, radioactively labeled sample. Unspecifically bound radioactive DNA was extracted under stringent conditions, ie through three five-minute washing steps with 2 x SSC; 0.1% SDS removed at 55 to 65 ° C. The analysis was carried out by autoradiography of the filters.
- Phage clone P17 was found with an approximately 250 bp long hTC cDNA fragment (positions 1787 to 2040 of FIG. 6). Phage clone P2 was generated with an approximately 740 bp long hTC cDNA
- ⁇ -DNA of this clone was analyzed in a Southern blot with a radioactively labeled approximately 440 bp long hTC cDNA fragment (position 1 to 440 of FIG. 6) hybridizes from the extreme 5 'region (FIG. 3).
- this phage probably also contains the 5' sequence region flanking the ATG start codon.
- restriction endonucleases were selected for DNA digestion, which on the one hand release the entire insert from EMBL3 Sp6 / T7 (cf. Example 2) and additionally cut in the insert .
- a total of approximately 8.3 and approximately 6.5 kb Xho I subfragment and approximately 8.5, approximately 3.5 and approximately 3 kb Sac I partial fragments were inserted into the vector pBIuescript KS (+) ( Stratagene) was cloned.
- the nucleotide sequence of 5123 bp 5 'flanking the ghTC gene region was determined by sequence analysis of these fragments, starting from the ATG start codon (FIG. 4; correspondingly
- SEQ ID NO 1). 4 shows the first 5123 bp (starting from the ATG start codon). 10 (corresponding to SEQ ID NO 3) the entire cloned 5 'sequence.
- restriction endonucleases were selected for DNA digestion, which on the one hand release the entire insert from EMLB3 Sp6 / T7 and additionally cut a few times in the insert.
- a 7J kb, a 4.2 kb and a 1.5 kb XhoI-BamHI fragment and a 1.8 kb BamHI fragment were subcloned by combination digestion with the enzymes Xhol and BamHI.
- Subfragments were made by digestion with the restriction enzyme Xhol. A total of 7.5 kb, 6.4 kb and 1.6 kb Xhol subfragment were cloned. A 4.8 kb, a 3 kb, a 2 kb and a 1.8 kb Sacl fragment were additionally subcloned by digestion with the restriction enzyme Sacl.
- the approximately 13.5 kb insert of the phage clone P3 was subcloned by digestion with the restriction enzymes Sacl or Xhol.
- the approximately 13.2 kb insert of phage clone P5 was subcloned by digestion with the restriction enzymes Sacl or Xhol. A total of 6.5 kb, 3.3 kb, 3.2 kb, 0.8 kb and 0.3 kb size SacI fragments and 7 kb and 3.2 kb size Xhol fragments were subcloned.
- 3 genomic walks were carried out using the Genome Walker TM kit from Clontech (catalog number Kl 803-1) and various primer combinations.
- 1 ⁇ l of human GenomeWalker Library HDL (from Clontech) was mixed with 10 pmol dNTP mix and a PCR reaction was carried out in 1 ⁇ Klen Taq PCR reaction buffer and 1 ⁇ Advantage Kien Taq polymerase mix (from Clontech).
- the subcloned fragments and the Genomic Walking products were sequenced in single strands. Overlapping areas were identified and contigs formed using the Lasergene Biocomputing Software (DNASTAR Inc. Madison, Wisconsin, USA). A total of 2 large contigs were compiled from the collected sequences of the phage clones P12, P17, P2, P3 and P5 and the sequence data from the genomic walking. Contig 1 consists of sequence data from phage clone P12, P17 and the sequence data from genomic walking. Contig 2 was assembled from the sequences of phage clones P2, P3 and P5. Overlapping phage clone areas are shown schematically in FIG. 7. The sequence data of the 2 contigs are shown below. The ATG
- CAGGCACTCC CCCAGATTCT AGGGCCTGGT TGCTGCTTCC CGAGGGCGCC ATCTGCCCTG GAGACTCAGC 6580
- GAGACCATCT TTCTGGGTTC CAGGCCCTGG ATGCCAGGGA CTCCCCGCAG GTTGCCCCGC CTGCCCCAGC 12530 GCTACTGGCA AATGCGGCCC CTGTTTCTGG AGCTGCTTGG GAACCACGCG CAGTGCCCCT ACGGGGGGCT
- ACAGCAGCCC CTGGCAGGTG TACGGCTTCG TGCGGGCCTG CCTGCGCCGG CTGGTGCCCC CAGGCCTCTG 12810
- TTACCTATAA TCCTCTTCGC AATTTCAAGG GTGGGAATGA GAGGTGGGGA CGAGAACCCC CTCTTCCTGG 13370
- CTCGTTGCCT CCTGGTCACT GGGCATTTGC TTTTATTTCT CTTTGCTTAG TGTTACCCCC TGATCTTTTT 17220 ATTGTCGTTG TTTGCTTTTG TTTATTGAGA CAGTCTCACT CTGTCACCCA GGCTGGAGTG TA90GGCAC
- ACAGGTGCAA GCCACCGTGC CCGGCATACC TTGATCTTTT AAAATGAAGT CTGAAACATT GCTACCCTTG 17570 TCCTGAGCAA TAAGACCCTT AGTGTATTTT AGCTCTGGCC ACCCCCCAGC CTGTGTGCTG TTTTCCCTGC 17640
- TTGTCGCCCA ACAGGAGCAT GACGTGAGCC ATGTGGATAA TTTTAAAATT TCTAGGCTGG GCGCGGTGGC 18270 TCACGCCTGT AATCCCAGCA CTTTGGGAGG CCAAGGCGGG TGGATCACGA GGTCAGGAGG TCGAGACCAT 18340
- CAGACGGTGC CAGACCATGC GGTGAGCTGG ATATGCGGTG TCCGGATGGT GCAGGTCTGG GGTGAGGTTG 19320 CCAGGCCCTG CTGTGAGTTG GATGTGGGGT GTCCGGATGC TGCAGGTCCGTC90GGGG
- CTCCTCTCGG GGGGCCTGTG GTGGCCATGG GGCAGGCGGC CTGGGAGAGC TGCCGTCACA CAGCCACTGG 5530
- CTTCTGTCAC GTCACCCAGG TTCCGTTAGG GTCCTTGGGG AGATGGGGCT GGTGCAGCCT GAGGCCCCAC 7910
- CTGTGTCCAA GTGTTCTCAT TGTTCAGTTC CCACCTGTGA GTGAGAACAT GTGGTGTTTG GTTTTCTTTC 8330
- AAAGCTGTAA AGGGAACCCT CAGAAAATGT GGCCGCCAGG GGTGGTTTCA GGTGCTTTGC TGGGCTGTGT 10360
- CTGCCAGGCC CAGCACCCTG CTCCAAATCA CCACTTCTCT GGGGTTTTCC AAAGCATTTA ACAAGGGTGT 11410
- CTGTGGGAGT GAGGGTGCTC ACAACGGGAG CAGTTTTCTG TGCTATTTTG GTAAAAGGAA ATGGTGCACC 11900
- CTGCACTCCA GCCTGGGCAA CAGAGTGAGA CTTCATCTTA AAAAAAAAAA AAAAAGTATC AGCATTCCAA 12670
- TTCTCCTAAC CACCTGAGAG GTAGAGGAGG AAAGGCTCCA GGGGAGCAGC CGCCCTTGGT CACCCAGCTG 14210
- AAGTCAGACC CATAGGCTCA GGGTGAGCCG GAGCCCAAGG TCGTGTTGGG GATGGCTGTG AAAGAAGAAA 14350
- CAAGAATCGA CAACTTTATC ACAGAGGGAA GGGCCAATCT GTGGAGGCCA CAGGGCCAGC TTCTGCCTGG 17150 AGTCAGGGCA GGTGGTGGCA CAAGCCTCGG GGCTGTACCA AAGGGCAGTC GGGCACCACCC 172 GGCCG
- CTGAAATTCA AGCCATGTCG AACCTGCGGT CCTGAGCTTA ACAGCTTCTA CTTTCTGTTC TTTCTGTGTT 20440
- Exon-intron structure of the hTC gene The genomic organization of the hTC gene is shown schematically in FIG. 7. The coding region of the hTC gene is exposed 16 exons together, which vary in size between 62 bp and 1354 bp (see Table 1). Exon 1 contains the translation start codon ATG. The translation stop codon TGA and the 3 'untranslated region lie on exon 16 (FIG. 8). A possible polyadenylation signal (AATAAA) was not found either in exon 16 or in the 3195 bp of the following 3 'flanking region. Based on the
- the exon-intron transitions were determined and listed in Table 1. With the exception of the 5 'splice site between exon 15 and intron 15, all exon-intron transitions match the published (Shapiro and Senapathy, 1987) splice consensus sequence. The size of the introns is between 104 bp and 8616 bp. Since Intron 6 was only partially isolated, the exact length of the hTC gene cannot be determined. Based on the partial sequence of -4660 bp obtained from Intron 6, the minimum size of the hTERT gene is 37 kb.
- Introns 1-5 and the 5 'region of the intron 6 are contained in Contig 1: Intron 1: bp 11493-11596 (SEQ ID NO 4); Intron 2: bp 12951-21566 (SEQ ID NO 5); Intron 3: bp 21763-23851 (SEQ ID NO 6); Intron 4: bp 24033-24719 (SEQ ID NO 7);
- Intron 5 bp 24900-25393 (SEQ ID NO 8); 5 'region of intron 6: bp 25550-26414 (SEQ ID NO 9).
- Intron 7 bp 3879-4858 (SEQ ID NO 11);
- Intron 8 bp 4945-7429 (SEQ ID NO 12);
- Intron 9 bp 7544-9527 (SEQ ID NO 13); Intron 10: bp 9600-1 1470 (SEQ ID NO 14);
- Intron 11 bp 11660-15460 (SEQ ID NO 15;
- Intron 12 bp 15588-16467 (SEQ ID NO 16);
- Intron 13 bp 16530-19715 (SEQ ID NO 17);
- Intron 14 19841-20621 (SEQ ID NO 18); Intron 15: 20760-21295 (SEQ ID NO 19).
- the 3 'non-transcribed area is also in Contig 2 at position 21960-25138 (SEQ ID NO 20).
- the introns have the following sequences: Intron 1 (SEQ ID NO 4)
- telomerase-characteristic T motif is located on exon 3.
- the RT (reverse transcriptase) motifs 1-7 which are important for the catalytic function of telomerase are located on the following exons: RT motif 1 and 2 on exon 4, RT motif 4 Exon 9, RT motif 5 on exon 10, RT motif 6 and 7 on exon 11.
- RT motif 3 is distributed on exon 5 and 6 (see Fig. 8).
- the elucidation of the exon-intron structure of the hTC gene also shows that the four deletion or insertion variants of the hTC cDNA described in our patent application PCT / EP / 98/03469, as well as three others, as described in the literature (Kilian et al., 1997) described hTC insertion variants most likely represent alternative splice products. As shown in Fig. 8, the splice variants can be divided into two groups: deletion variants and insertion variants.
- variants of the deletion group lack specific sequence segments.
- the 36 bp in frame deletion in variant DEL1 most likely results from the use of an alternative 3 'splice acceptor sequence in exon 6, whereby part of the RT motif 3 is lost.
- variant DEL2 the normal 5 'splice donor and 3' splice acceptor sequences from intron 6, 7 and 8 are not used. Instead, exon 6 is fused directly to exon 9, causing the open reading frame to shift and exon 10 to have a stop codon.
- Variant Del3 represents a combination of variants 1 and 2.
- the group of insertion variants is characterized by the insertion of intron sequences that lead to premature translation stop.
- an alternative, 3' localized splice site in variant INS1 is used, which results in an insertion of the first 38 bp from intron 4 between exon 4 and exon 5.
- This also results in Insertion of an intron 1 1 sequence region in variant INS2 from the use of an alternative 5 'splice donor sequence in intron 1 1. Since this variant has been insufficiently described in the literature (Kilian et al., 1997), the exact alternative 5 can be Do not determine the splice donor sequence of this variant.
- the insertion of intron 14 sequences between exon 14 and exon 15 in variant INS3 results from the use of an alternative 3 ′′ splice acceptor sequence, as a result of which the 3 ′ part of intron 14 is not spliced.
- the hTC variant INS4 (variant 4) described in our patent application PCT / EP / 98/03469 is characterized by the replacement of exon 15 and the 5 ′ portion of
- proteins encode without reverse transcriptase activity, they could still play a crucial role as transdominant-negative telomerase regulators, e.g. compete for interaction with important attachment partners.
- the 5 ' end of the hTC mRNA was determined by primer extension analysis.
- the primer extension was carried out in a total volume for 1 h at 58 ° C.
- the reaction was stopped by 4 ⁇ l of 0.5 M EDTA, pH 8.0 and the RNA was degraded after 30 ⁇ l of RNaseA (10 mg / ml) for 30 min at 37 ° C.
- 2.5 ⁇ g of sheared calf thymus DNA and 100 ⁇ l of TE were added and extracted once with 150 ⁇ l of phenol / chloroform (1: 1).
- the DNA was added with the addition of 15 ul 3 M Na
- a main transcription start site was identified, the 1767 bp 5 ' from
- ATG start codon of the hTC cDNA sequence is located (nucleotide position 3346 in
- TTA + I TTGT The nucleotide sequence around this main transcription start (TTA + I TTGT) also represents an initiator element (Inr), which is in 6 of 7 nucleotides agrees with the consensus motif (PyPyA +1 Na / tPyPy) (Smale, 1997) of an initiator element.
- TATA box No clear TATA box could be identified in the immediate vicinity of the experimentally identified main transcription start, so that the hTC promoter can probably be classified into the family of TATA-free promoters (Smale, 1997).
- a potential TATA box from nucleotide position 1306 to 131 1 was found by bioinformatics analysis. The additional transcription starts observed around the main transcription start were also described for other TATA-less promoters (Geng and Johnson, 1993), e.g. in the highly regulated promoters of some cell cycle genes (Wick et al, 1995).
- HL60 cells Starting point of the hTC transcript, a further translation start area would be identified in HL60 cells.
- the region of the transcription start of the hTC gene in HL60 cells was limited to the bp -60 to -105 using RT-PCR analyzes.
- genomic DNA was also used as a control for the PCR.
- genomic DNA was also used as a control for the PCR.
- Figure 9 only with the primer combinations HTRT5B-C5Rschreib, C5S-C5Rschreib and PRO-TESTl-C5Rschreib a PCR product was obtained, indicating that the starting point of hTC transcription in the region between bp-60 and bp-105 lies.
- CpG Islands In the approximately 11.2 kb isolated 5 'flanking region of the hTC gene, there are several extremely GC-rich areas, so-called CpG Islands.
- a CpG Islands with a GC content of> 70% ranges from bp - 1214 to intron 2.
- Two other GC-rich areas with a GC content of> 60% range from bp -3872 to bp -31 13 or bp -5363 to bp -3941.
- the location of the CpG Islands is shown graphically in Fig. 1 1.
- Pattem "algorithm from the" GCG Sequence Analysis "program package from the” Genetics Computer Group "(Madison, USA) was carried out. As a result, various potential binding sites in the region up to -900 bp were upstream from Translation start codon ATG identified: five Spl binding sites, one c-Myc binding site, one CCAC box (FIG. 10). In addition, a CCAAT box and a second c-Myc binding site were found at positions -1788 and -3995 of the 5'-flanking region.
- hTC promoter sequence sections were generated by PCR amplification and cloned 5 'before the reporter gene luciferase into the vector pGL2 from Promega.
- the 8.5 kb SacI fragment subcloned from the P12 phage clone was chosen as the source for the PCR amplification.
- 35 ng of this DNA was mixed with 10 pmol dNTP mix and one in lxPCR reaction buffer (PCR optimizer kit from InVitrogen) and a unit platinum Taq DNA polymerase (from Gibco / BRL) PCR reaction performed.
- PCR optimizer kit from InVitrogen
- a unit platinum Taq DNA polymerase from Gibco / BRL
- the PCR was carried out in 3 steps. A two-minute denaturation at 94 ° C was followed by 30 PCR cycles in which the DNA was first denatured for 45 sec at 94 ° C and then the primers were attached for 5 min at 68 ° C and the DNA chain was extended. Finally, the chain was extended at 68 ° C for 10 min.
- the primer PK-3A (5'-GCAAGCTTGACGCAGCGCTGCCTGAAACTCG-3 ', position -43 to -65) was chosen as the 3'-PCR primer, which recognizes a sequence region 42 bp upstream from the START codon ATG.
- a 4051 bp promoter fragment was amplified (NPK8) by combining the PK-3A primer with the 5'-PCR primer PK-5B (5'-CCAGATCTCTGGAACACAGAGTGGCAGTTTCC-3 ', position -4093 to -4070).
- the combination of the primer pair PK-3A and PK-5C (5'--
- a 2068 bp promoter fragment was obtained by using the primer combination PK-3A and PK-5D (5'- GGAGATCTGATCTTGGCTTACTGCAGCCTCTG-3 ', position -2110 to -2087) amplified (NPK22).
- the use of the primer combination PK-3A and PK-5E (5'-GGAGATCTGTCTGGATTCCTGGGAAGTCCTCA-3 ', position -1125 to -1102) finally led to the amplification of a 1083 bp promoter fragment (NPK27).
- the PK-3A primer contains a HindIII recognition sequence.
- the various 5 'primers contain a BglII recognition sequence.
- the resulting PCR products were purified using the QIA quick spin PCR purification kit from Qiagen, according to the manufacturers, and then digested with the restriction enzymes Bglll and Hindlll.
- the pGL2 promoter vector was digested with the same restriction enzymes and the SV40 promoter contained in this vector was released and separated.
- the PCR promoter fragments were ligated into the vector and transformed into competent DH5 ⁇ bacteria from Gibco / BRL. Transformed bacterial clones became DNA for the promoter-activity analyzes described below using Qiagen
- the activity of the hTC promoter was analyzed in transient transfections in eukaryotic cells.
- CHO-Kl and HEK 293 cells were purchased from the American Type Culture collection.
- CHO-Kl cells were kept in DMEM Nut Mix F-12 cell culture medium (Gibco-BRL, order number: 21331-020) with 0.15% streptomycin / penezillin, 2 mM glutamine and 10% FCS (Gibco-BRL) .
- HEK 293 cells were cultivated in DMOD cell culture medium (Gibco-BRL, order number: 41965-039) with 0J5% streptomycin / penicillin, 2 mM glutamine and 10% FCS (Gibco-BRL).
- CHO-Kl and HEK 293 cells were cultivated in a water-saturated atmosphere at 37 ° C. with gassing with 5% CO 2 .
- the medium was suctioned off, the cells were washed with PBS (100 mM KH 2 PO 4 pH 7.2; 150 mM NaCl) and detached by adding a trypsin-EDTA solution (Gibco-BRL).
- the trypsin was inactivated by adding the medium and the number of cells was determined using a Neubauer counting chamber in order to plate out the cells in the desired density.
- HEK 293 cells were plated out in a 24 well cell culture plate per well. After 3 hours the HEK 293 medium was removed. Up to 2.5 ⁇ g of plasmid DNA, 1 ⁇ g of a CMV ß-Gal plasmid construct (Stratagene, order number: 200388), 200 ⁇ l serum-free medium and 10 ⁇ l transfection reagent (DOTAP from Boehringer Mannheim) were used for the transfection for 15 Incubated for minutes at room temperature and then dripped evenly onto the HEK 293 cells. After 3 hours, 1.5 ml of medium were added. The medium was changed after 20 hours. After another 24
- the cells were harvested for hours to determine the luciferase and the ⁇ -gal activity. For this, the cells were lysed in the cell culture lysis reagent (25 mM Tris [pH 7.8] with H 3 PO 4 ; 2 mM CDTA; 2 mM DTT; 10% glycerol; 1% Triton X-100) for 15 minutes at room temperature. Twenty ul of this cell lysate was treated with 100 ul luciferase assay buffer (20mM tricine; 1.07mM (MgCO 3 ) Mg (OH) 5H 2 O;
- Galactosidase assay buffer 100 mM sodium phosphate buffer pH 7.3; 1 mM MgCl 2 ; 50 mM ⁇ -mercaptoethanol; 0.665 mg / ml ONPG) for at least 30 minutes at 37 ° C or until a slight yellow color appears.
- the reaction was stopped by adding 100 ⁇ l of 1 M Na 2 CO 3 and the absorption at 420 nm was determined.
- the standard deviation was also given.
- the NPK 27 construct shows a 40-fold higher luciferase activity than the basal activity of the promoterless luciferase control construct (pGL2-basic) and a 2 to 3-fold higher activity than the SV40 promoter control construct (pGL2PRO).
- pGL2-basic the basal activity of the promoterless luciferase control construct
- pGL2PRO the promoterless luciferase control construct
- pGL2PRO the SV40 promoter control construct
- RNA component of human telomerase Science 269, 1236-1241.
- telomere sequence (TTAGGG) n among vertebrates. Proc. Natl. Acad. Be. 86, 7049-7053.
- RNA splice junetions of different classes of eukaryotes sequence statistics and functional implications in gene expression. Nucl. Acids Res. 15, 7155-7174.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CA002316282A CA2316282A1 (en) | 1997-12-24 | 1998-12-22 | Regulatory dna sequences of the human catalytic telomerase sub-unit gene, diagnostic and therapeutic use thereof |
EP98966334A EP1040195A2 (de) | 1997-12-24 | 1998-12-22 | Regulatorische dna-sequenzen des gens der humanen katalytischen telomerase-untereinheit und deren diagnostische und therapeutische verwendung |
JP2000526653A JP2003519462A (ja) | 1997-12-24 | 1998-12-22 | ヒト触媒テロメラーゼサブユニット遺伝子の調節性dna配列、その診断的および治療的使用 |
AU22729/99A AU742489B2 (en) | 1997-12-24 | 1998-12-22 | Regulatory DNA sequences of the human catalytic telomerase sub-unit gene, diagnostic and therapeutic use thereof |
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DE19757984.1 | 1997-12-24 | ||
DE1997157984 DE19757984A1 (de) | 1997-12-24 | 1997-12-24 | Regulatorische DNA-Sequenzen aus der 5'-Region vom Gen der humanen katalytischen Telomerase-Untereinheit udn deren diagnostische und therapeutische Verwendung |
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US10/840,455 Continuation US20050032094A1 (en) | 1997-12-24 | 2004-05-06 | Regulatory DNA sequences of the human catalytic telomerase sub-unit gene, diagnostic and therapeutic use thereof |
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Cited By (20)
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WO2000046355A2 (en) * | 1999-02-04 | 2000-08-10 | Geron Corporation | Telomerase reverse transcriptase transcriptional regulatory sequences |
DE10019195A1 (de) * | 2000-04-17 | 2001-10-25 | Univ Eberhard Karls | Reversible Immortalisierung |
WO2003038047A2 (en) * | 2001-10-29 | 2003-05-08 | Baylor College Of Medicine | Human telomerase reverse transcriptase as a class-ii restricted tumor-associated antigen |
US6576464B2 (en) | 2000-11-27 | 2003-06-10 | Geron Corporation | Methods for providing differentiated stem cells |
US6610839B1 (en) | 1997-08-14 | 2003-08-26 | Geron Corporation | Promoter for telomerase reverse transcriptase |
US6686159B2 (en) | 2000-08-24 | 2004-02-03 | Sierra Sciences, Inc. | Methods and compositions for modulating telomerase reverse transcriptase (TERT) expression |
US6713055B2 (en) | 2000-11-27 | 2004-03-30 | Geron Corporation | Glycosyltransferase vectors for treating cancer |
US6777203B1 (en) | 1997-11-19 | 2004-08-17 | Geron Corporation | Telomerase promoter driving expression of therapeutic gene sequences |
US6808880B2 (en) | 1996-10-01 | 2004-10-26 | Geron Corporation | Method for detecting polynucleotides encoding telomerase |
US6927285B2 (en) | 1996-10-01 | 2005-08-09 | Geron Corporation | Genes for human telomerase reverse transcriptase and telomerase variants |
US6936595B2 (en) * | 1999-10-04 | 2005-08-30 | Heart Biosystems, Gmbh | Tumour-specific vector for gene therapy |
US7005262B2 (en) | 1996-10-01 | 2006-02-28 | Geron Corporation | Methods for detecting nucleic acids encoding human telomerase reverse transcriptase |
US7195911B2 (en) | 1996-10-01 | 2007-03-27 | Geron Corporation | Mammalian cells that have increased proliferative capacity |
US7211435B2 (en) | 2001-06-21 | 2007-05-01 | Sierra Sciences, Inc. | Telomerase expression repressor proteins and methods of using the same |
US7262288B1 (en) | 1997-04-18 | 2007-08-28 | Geron Corporation | Nucleic acids encoding human telomerase reverse transcriptase and related homologs |
US7378244B2 (en) | 1997-10-01 | 2008-05-27 | Geron Corporation | Telomerase promoters sequences for screening telomerase modulators |
US7413864B2 (en) | 1997-04-18 | 2008-08-19 | Geron Corporation | Treating cancer using a telomerase vaccine |
US8163892B2 (en) | 2002-07-08 | 2012-04-24 | Oncolys Biopharma, Inc. | Oncolytic virus replicating selectively in tumor cells |
US8222392B2 (en) | 1996-10-01 | 2012-07-17 | Geron Corporation | Kit for detection of telomerase reverse transcriptase nucleic acids |
US8709995B2 (en) | 1997-04-18 | 2014-04-29 | Geron Corporation | Method for eliciting an immune response to human telomerase reverse transcriptase |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998014593A2 (en) * | 1996-10-01 | 1998-04-09 | Geron Corporation | Human telomerase catalytic subunit |
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1997
- 1997-12-24 DE DE1997157984 patent/DE19757984A1/de not_active Withdrawn
-
1998
- 1998-12-22 JP JP2000526653A patent/JP2003519462A/ja not_active Withdrawn
- 1998-12-22 EP EP98966334A patent/EP1040195A2/de not_active Withdrawn
- 1998-12-22 CA CA002316282A patent/CA2316282A1/en not_active Abandoned
- 1998-12-22 WO PCT/EP1998/008216 patent/WO1999033998A2/de not_active Application Discontinuation
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Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO1998014593A2 (en) * | 1996-10-01 | 1998-04-09 | Geron Corporation | Human telomerase catalytic subunit |
Non-Patent Citations (6)
Title |
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CONG, Y.-S. ET AL.: "The human telomerase catalytic subunit hTERT: organization of the gene and characterization of the promoter" HUMAN MOLECULAR GENETICS., Bd. 8, 1. Januar 1999 (1999-01-01), Seiten 137-142, XP002105208 OXFORD UNIVERSITY PRESS, SURREY., GB ISSN: 0964-6906 * |
HORIKAWA, I. ET AL.: "Cloning and characterization of the promoter region of human telomerase reverse transcriptase gene" CANCER RESEARCH., Bd. 59, 15. Februar 1999 (1999-02-15), Seiten 826-830, XP002105210 AMERICAN ASSOCIATION FOR CANCER RESEARCH, BALTIMORE, MD., US ISSN: 0008-5472 * |
KILIAN ET AL: "Isolation of a candidate human telomerase catalytic subunit gene, which reveals complex splicing patterns in different cell types" HUMAN MOLECULAR GENETICS, Bd. 6, Nr. 12, November 1997 (1997-11), Seiten 2011-2019, XP002086926 ISSN: 0964-6906 in der Anmeldung erw{hnt * |
NAKAMURA T M ET AL: "TELOMERASE CATALYTIC SUBUNIT HOMOLOGS FROM FISSION YEAST AND HUMAN" SCIENCE, Bd. 277, 15. August 1997 (1997-08-15), Seiten 955-959, XP002056803 ISSN: 0036-8075 * |
TAKAKURA, M. ET AL.: "Cloning of human telomerase catalytic subunit (hTERT) gene promoter and identification of proximal core promoter sequences essential for transcriptional activation in immortalized and cancer cells" CANCER RESEARCH., Bd. 59, 1. Februar 1999 (1999-02-01), Seiten 551-557, XP002105209 ISSN: 0008-5472 * |
WICK, M. ET AL.: "Genomic organization and promoter characterization of the gene encoding the human telomerase reverse transcriptase (hTERT)" GENE: AN INTERNATIONAL JOURNAL ON GENES AND GENOMES., Bd. 232, 17. Mai 1999 (1999-05-17), Seiten 97-106, XP002105207 ISSN: 0378-1119 * |
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US6808880B2 (en) | 1996-10-01 | 2004-10-26 | Geron Corporation | Method for detecting polynucleotides encoding telomerase |
US7056513B2 (en) | 1996-10-01 | 2006-06-06 | Geron Corporation | Telomerase |
US6927285B2 (en) | 1996-10-01 | 2005-08-09 | Geron Corporation | Genes for human telomerase reverse transcriptase and telomerase variants |
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US7378244B2 (en) | 1997-10-01 | 2008-05-27 | Geron Corporation | Telomerase promoters sequences for screening telomerase modulators |
US6777203B1 (en) | 1997-11-19 | 2004-08-17 | Geron Corporation | Telomerase promoter driving expression of therapeutic gene sequences |
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Also Published As
Publication number | Publication date |
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AU2272999A (en) | 1999-07-19 |
AU742489B2 (en) | 2002-01-03 |
WO1999033998A3 (de) | 1999-08-19 |
EP1040195A2 (de) | 2000-10-04 |
JP2003519462A (ja) | 2003-06-24 |
DE19757984A1 (de) | 1999-07-01 |
CA2316282A1 (en) | 1999-07-08 |
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