Longevity mutation in SCH9 prevents recombination errors and premature genomic instability in a Werner/Bloom model system.

Longevity mutation in SCH9 prevents recombination errors and premature genomic instability in a Werner/Bloom model system.
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DOI:
10.1083/jcb.200707154
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发表时间:
2008-01-14
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Longo VD
Longo VD
中科院分区:
其他
文献类型:
--
作者:
Madia F;Gattazzo C;Wei M;Fabrizio P;Burhans WC;Weinberger M;Galbani A;Smith JR;Nguyen C;Huey S;Comai L;Longo VD

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沃纳和布鲁姆综合症是一种人类疾病,其特征是与年龄相关的过早缺陷,包括癌症发病率升高。使用新型酿酒酵母衰老和癌症模型系统,我们发现缺乏 RecQ 解旋酶 SGS1(WRN 和 BLM 同源物)的细胞会过早发生与年龄相关的变化,包括压力和热量限制 (CR) 下寿命缩短、G1 停滞缺陷、去分化、重组错误升高以及 DNA 突变的年龄依赖性增加。与初始种群扩张期间相比,SGS1 的缺乏会导致非分裂细胞衰老过程中染色体总重排频率增加 110 倍。这强调了衰老在基因组不稳定中的核心作用。删除 SCH9(与 AKT 和 S6K 同源),但不删除 CR,可以通过抑制容易出错的重组并防止 DNA 损伤和去分化来防止 sgs1Δ 中年龄依赖性缺陷。 Akt/S6k 同源物在寿命调节中的保守功能提出了调节 IGF-I–Akt–56K 通路可以预防哺乳动物早衰综合症的可能性。
Werner and Bloom syndromes are human diseases characterized by premature age-related defects including elevated cancer incidence. Using a novel Saccharomyces cerevisiae model system for aging and cancer, we show that cells lacking the RecQ helicase SGS1 (WRN and BLM homologue) undergo premature age-related changes, including reduced life span under stress and calorie restriction (CR), G1 arrest defects, dedifferentiation, elevated recombination errors, and age-dependent increase in DNA mutations. Lack of SGS1 results in a 110-fold increase in gross chromosomal rearrangement frequency during aging of nondividing cells compared with that generated during the initial population expansion. This underscores the central role of aging in genomic instability. The deletion of SCH9 (homologous to AKT and S6K), but not CR, protects against the age-dependent defects in sgs1Δ by inhibiting error-prone recombination and preventing DNA damage and dedifferentiation. The conserved function of Akt/S6k homologues in lifespan regulation raises the possibility that modulation of the IGF-I–Akt–56K pathway can protect against premature aging syndromes in mammals.
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