1995 Fiscal Year Final Research Report Summary
Functional analysis of RNA polymerase II responsible for induction of sister chromatid exchange.
| Project/Area Number |
06640804
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
遺伝
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| Research Institution | National Institute of Radiological Sciences |
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Principal Investigator |
TSUJI Hideo National Institute of Radiological Science, 2nd Research Group, Senior Researcher, 第2研究グループ, 主任研究官 (40163795)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Sister chromatid exchange / RNA polymerase II / Temperature-sensitive metant / FISH / Mutation / cDNA / Gene / cDNA |
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| Research Abstract |
A temperature-sensitive CHO-K1 cell mutant, tsTM4, exhibited abnormal induction of sister chromatid exchages (SCEs) along with decreased DNA synthesis in the cells arrested in the S phase at the nonpermissive temperature (39ﾟC).We have cloned a human gene that complemented the genetic defect of tsTM4 cells by transfecting human genomic DNA into them and collecting the human DNA fragments from the secondary transformants. DNA seguence analysis of these fragments revealed that it is the human RNA polymerase II largest subunit gene, HSRPIILS,with 29 exons spanning 31 kbp.The HSRPIILS gene was mapped to 17p13.1 by fluorescence in situ hybridization.Transfection of cloned genomic DNA fragments containing the entire coding regions of HSRPIILS into tsTM4 cells rescued their abnormal SCE induction phonotype.The Northern analysis showed that the HSRPIILS was transcribed at 39ﾟC and 33.5ﾟC in the transformant, suggesting that a defect in the RPIILS gene is responsible for the abnormal induction of SCEs in the tsTM4 mutant.Transcriptional activity of tsTM4 cells was normal with respect to fine genes even at the nonpermissive temperature when the amounts of transcribed RNA were examined by Northevn analysis.This suggests that a defect in RPIILS is limited to transcription of only a part of genes or responsible for another function in DNA metabolism.To identify mutational sites of RPIILS gene, RPIILS cDNAs were isolated from the wild-type Chinese hamster cells and tsTM4 cells, and sequenced.Several candidate sites for mutation were found.
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[Publications] Hongo, E., Morimyo, M., Mita, K., Machida, I., Hama-Inaba, H., Tsuji, H., Ichimura, S.and Noda, Y.: "The methyl viologen-resistance-encoding gene smvA of Salmonella typhimurium." Gene. 148. 173-174 (1994)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Sudha, T., Tsuji, H., Sameshima, M., Matuda, Y., Kaneko, S., Nagai, Y., Yamao, F.and Seno, T.: "Abnormal integrity of nucleolus associated with cell cycle arrest owing to the temperature-sensitive ubiquitin-activating enzyme E1." Chromosome Res.3. 115-123 (1995)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Mita, K., Tsui, H., Morimyo, M., Takahashi, E., Nenoi, M., Ichimura, S., Yamauchi, M., Hongo, E.and Hayashi, A.: "The human gene encoding the largest subunit of RNA polymerase II." Gene. 159. 285-286 (1995)
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「研究成果報告書概要(欧文)」より
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[Publications] Mita, K., Nenoi, M., Morimyo, M., Tsuji, H., Ichimura, S., Sawai, M.and Hamana, K.: "Expression of the Bombyx mori beta-tubulin-encoding gene in testis." Gene. 162. 329-330 (1995)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Nenoi, M., Mita, K., Ichimura, S., Cartwright, I., Takahashi, E., Yamauchi, M.and Tsuji, H.: "Heterogeneous structure of the polyubiguitin gene UbC of HeLa S3 cells." Gene. (in press). (1996)
Description
「研究成果報告書概要(欧文)」より
