N6-methyldeoxyadenosine marks active transcription start sites in Chlamydomonas.

N6-methyldeoxyadenosine marks active transcription start sites in Chlamydomonas.
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N6-甲基脱氧腺苷标记了衣原体中的主动转录起始位点。

DOI:
10.1016/j.cell.2015.04.010
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发表时间:
2015-05-07
期刊:
影响因子:
64.5
通讯作者:
He C
He C
中科院分区:
生物学1区
文献类型:
--
作者:
Fu Y;Luo GZ;Chen K;Deng X;Yu M;Han D;Hao Z;Liu J;Lu X;Dore LC;Weng X;Ji Q;Mets L;He C

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N6-甲基脱氧腺苷(6 mA或m6 A)是一种保存在原核生物到真核生物中的DNA修饰。它广泛存在于细菌中,在DNA错配修复、染色体分离和毒力调节中发挥作用。相比之下,6 mA在真核生物中的分布和功能尚不清楚。在这里,我们提出了一个全面的分析6 mA景观衣原体基因组中使用新的测序方法。我们在衣原体中鉴定了84%的基因中的6 mA修饰。我们发现6 mA主要位于转录起始位点(TSS)附近的ApT二核苷酸上,呈双峰分布,似乎是活性基因的标记。在基础分辨率下也观察到6 mA沉积的周期性模式,这与TSS附近的核小体分布有关,表明可能在核小体定位中起作用。6 mA的新的全基因组定位及其在衣原体基因组中的独特分布表明6 mA在真核生物中的基因表达中具有潜在的调节作用。
N6-methyldeoxyadenosine (6mA or m6A) is a DNA modification preserved in prokaryotes to eukaryotes. It is widespread in bacteria, and functions in DNA mismatch repair, chromosome segregation, and virulence regulation. In contrast, the distribution and function of 6mA in eukaryotes have been unclear. Here we present a comprehensive analysis of the 6mA landscape in the genome of Chlamydomonas using new sequencing approaches. We identified the 6mA modification in 84% of genes in Chlamydomonas. We found that 6mA mainly locates at ApT dinucleotides around transcription start sites (TSS) with a bimodal distribution, and appears to mark active genes. A periodic pattern of 6mA deposition was also observed at base resolution, which is associated with nucleosome distribution near the TSS, suggesting a possible role in nucleosome positioning. The new genome-wide mapping of 6mA and its unique distribution in the Chlamydomonas genome suggest potential regulatory roles of 6mA in gene expression in eukaryotic organisms.
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