Species-specific transcription in mice carrying human chromosome 21.

Species-specific transcription in mice carrying human chromosome 21.
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DOI:
10.1126/science.1160930
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发表时间:
2008-10-17
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Odom DT
Odom DT
中科院分区:
其他
文献类型:
--
作者:
Wilson MD;Barbosa-Morais NL;Schmidt D;Conboy CM;Vanes L;Tybulewicz VL;Fisher EM;Tavaré S;Odom DT

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同源转录因子组指导保守的组织特异性基因表达,但转录因子结合事件在密切相关的物种之间迅速分化。我们使用来自携带人类21号染色体的非整倍体小鼠品系的肝细胞,以确定在染色体规模上转录调控的种间差异是否主要由人类遗传序列或小鼠核环境指导。几乎所有的转录因子结合位置,转录起始的地标,以及在人肝细胞中观察到的基因表达在小鼠肝细胞核中的整个人21号染色体上重现。因此,在同源组织中,基因序列主要负责指导转录程序;表观遗传机制,细胞环境和转录因子本身的种间差异发挥次要作用。
Homologous sets of transcription factors direct conserved tissue-specific gene expression, yet transcription factor binding events diverge rapidly between closely related species. We used hepatocytes from an aneuploid mouse strain carrying human chromosome 21 to determine on a chromosomal scale whether interspecies differences in transcriptional regulation are primarily directed by human genetic sequence or mouse nuclear environment. Virtually all transcription factor binding locations, landmarks of transcription initiation, and the resulting gene expression observed in human hepatocytes were recapitulated across the entire human chromosome 21 in the mouse hepatocyte nucleus. Thus, in homologous tissues, genetic sequence is largely responsible for directing transcriptional programs; interspecies differences in epigenetic machinery, cellular environment, and transcription factors themselves play secondary roles.
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