Fission yeast telosomes: non-canonical histone-containing chromatin structures dependent on shelterin and RNA.

Fission yeast telosomes: non-canonical histone-containing chromatin structures dependent on shelterin and RNA.
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DOI:
10.1093/nar/gky605
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发表时间:
2018-09-28
影响因子:
14.9
通讯作者:
Cooper JP
Cooper JP
中科院分区:
生物学2区
文献类型:
--
作者:
Greenwood J;Patel H;Cech TR;Cooper JP

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尽管端粒在染色体稳定性中至关重要,但端粒染色质的结构仍是一个重大谜团。通过微球菌核酸酶作图,我们发现分裂酵母染色体末端组装成不同的保护结构(端粒),包括端粒DNA重复序列和超过0.5千碱基的亚端粒DNA。端粒的形成依赖于保守的端粒蛋白Taz1和Rap1,令人惊讶的是,还依赖于RNA。虽然酵母端粒长期以来一直被认为不含组蛋白,但我们证明情况并非如此;端粒重复序列含有组蛋白。虽然端粒组蛋白H3带有异色裂解9-甲基标记,但我们发现该标记对于端粒的形成是必不可少的。因此,端粒染色质是在结构水平上组织的,在结构水平上,端粒结合蛋白和RNA施加了独特的核小体排列,在第二水平上,组蛋白修饰叠加在更高级别的结构上。
Despite the prime importance of telomeres in chromosome stability, significant mysteries surround the architecture of telomeric chromatin. Through micrococcal nuclease mapping, we show that fission yeast chromosome ends are assembled into distinct protected structures (‘telosomes’) encompassing the telomeric DNA repeats and over half a kilobase of subtelomeric DNA. Telosome formation depends on the conserved telomeric proteins Taz1 and Rap1, and surprisingly, RNA. Although yeast telomeres have long been thought to be free of histones, we show that this is not the case; telomere repeats contain histones. While telomeric histone H3 bears the heterochromatic lys9-methyl mark, we show that this mark is dispensable for telosome formation. Therefore, telomeric chromatin is organized at an architectural level, in which telomere-binding proteins and RNAs impose a unique nucleosome arrangement, and a second level, in which histone modifications are superimposed upon the higher order architecture.
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