Chromatin-associated periodicity in genetic variation downstream of transcriptional start sites.
Chromatin-associated periodicity in genetic variation downstream of transcriptional start sites.
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DOI:
10.1126/science.1163183
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发表时间:
2009-01-16
期刊:
影响因子:
--
通讯作者:
Morishita S
中科院分区:
文献类型:
--
作者:
Sasaki S;Mello CC;Shimada A;Nakatani Y;Hashimoto S;Ogawa M;Matsushima K;Gu SG;Kasahara M;Ahsan B;Sasaki A;Saito T;Suzuki Y;Sugano S;Kohara Y;Takeda H;Fire A;Morishita S
Might DNA sequence variation reflect germline genetic activity and underlying chromatin structure? Using two strains of medaka (Japanese killifish, Oryzias latipes), we compared genomic sequence and mapped ~37.3 million nucleosome cores from medaka Hd-rR blastulae, together with 11,654 representative transcription start sites from six embryonic stages. We observed a ~200-bp periodic pattern of genetic variation downstream of transcription start sites; the rate of insertions and deletions longer than 1bp peaked at positions approximately +200, +400, and +600bp, while the point mutation rate showed corresponding valleys. This ~200-bp periodicity was correlated with the chromatin structure, with nucleosome occupancy minimized at positions 0, +200, +400, and +600bp. These data exemplify the potential for genetic activity (transcription) and chromatin structure to contribute in molding the DNA sequence on an evolutionary timescale.
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