Two SET domain containing genes link epigenetic changes and aging in Caenorhabditis elegans.

Two SET domain containing genes link epigenetic changes and aging in Caenorhabditis elegans.
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DOI:
10.1111/j.1474-9726.2011.00785.x
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发表时间:
2012-04
期刊:
影响因子:
7.8
通讯作者:
Lee SS
Lee SS
中科院分区:
生物学1区
文献类型:
--
作者:
Ni Z;Ebata A;Alipanahiramandi E;Lee SS

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表观遗传状态和染色质结构的变化已被证明与许多生物体的衰老有关。在这里,我们报告了一个RNAi筛选假定的组蛋白甲基转移酶和脱甲基酶在野生型C。elegans使用生殖抑制剂。我们确定了六个基因,当被RNAi灭活时,它们会持续延长寿命。其中五个基因不需要生殖细胞增殖就能影响寿命。我们进一步表征了这些基因中的两个,即高度同源的包含SET结构域的基因set-9和set-26。它们在维持正常寿命方面具有冗余功能,同时表现出不同的组织表达模式。此外,我们发现set-9和set-26部分通过FOXO转录因子α-16来调节寿命。有趣的是,单独的体细胞SET-26失活导致寿命延长,并以年龄依赖性方式改变组蛋白H3蛋白和抑制性组蛋白标记H3 K9 me 3和H3 K27 me 3的水平。我们假设SET-26的失活触发了补偿机制以恢复抑制性染色质结构,从而影响染色质稳定性以促进长寿。
Changes of epigenetic status and chromatin structure have been shown to associate with aging in many organisms. Here, we report an RNAi screen of putative histone methyltransferases and demethylases in wild type C. elegans using reproduction inhibitor. We identified six genes that, when inactivated by RNAi, consistently extend lifespan. Five of these genes do not require germline proliferation to affect lifespan. We further characterized two of these genes, the highly homologous SET-domain containing genes, set-9 and set-26. They share redundant functions in maintaining normal lifespan, while exhibiting differential tissue expression patterns. Furthermore, we found that set-9 and set-26 partially act through the FOXO transcription factor, DAF-16, to modulate lifespan. Interestingly, inactivation of somatic SET-26 alone results in a robust lifespan extension, and alters the levels of histone H3 protein and the repressive histone marks, H3K9me3 and H3K27me3, in an age-dependent manner. We hypothesize that inactivation of SET-26 triggers compensation mechanisms to restore repressive chromatin structure, and hence affects chromatin stability to promote longevity.
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