期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1998
卷号：95
期号：15
页码：8733-8738
DOI：10.1073/pnas.95.15.8733
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Bloom's syndrome (BS) and Werner's syndrome (WS) are genetic disorders in which an increased rate of chromosomal aberration is detected. The genes responsible for these diseases, BLM and WRN, have been found to be homologs of Escherichia coli recQ and Saccharomyces cerevisiae SGS1 genes. Here we show that yeast Sgs1 helicase acts as a suppressor of illegitimate recombination through homologous recombination and that human BLM and WRN helicases can suppress the increased homologous and illegitimate recombinations in the S. cerevisiae sgs1 mutant. The results imply a role of BLM and WRN helicases to control genomic stability in human cells. Similar to Sgs1 helicase, BLM helicase suppressed the cell growth in the top3 sgs1 mutation background and restored the increased sensitivity of the sgs1 mutant to hydroxyurea, but the WRN helicase did not. We discussed differential roles of BLM and WRN helicases in human cells. BLM- and WRN-bearing yeasts provide new useful models to investigate human BS and WS diseases.
关键词：RecQ homologue/Rqh1/illegitimate recombination/homologous recombination/topoisomerase III
