Msx1在抑制性靶标基因上的结合位点倾向于分布在LADs内
[Abstract]:In the nucleus, the spatial arrangement of the genome is not random. The chromatin of different kinds of cells can be arranged in different spaces; the chromatin of the same kind of cells is different in its spatial arrangement in different development processes. The nuclear fiber layer can be combined with the LADs on the chromatin to anchor the LADs in the nucleus of the nucleus, thereby inhibiting the transcription of a specific gene. In the early stage of our study, the homeobox protein Msx1 was enriched in the nucleus of the nucleus during the limb development. In addition, in the mouse myoblasts C2C12, the exogenous Msx1 is also enriched in the nucleus of the nucleus, while the inhibitory target gene (Myo D, Myf5, etc.) of Msx1 also tends to be positioned in the nucleus of the nucleus. So, is Msx1 related to the inhibition of its target gene? Therefore, we have systematically analyzed the relationship between the binding of Msx1 to the DNA and the LAD at the genomic level. In the mouse myoblasts, C2C12, Msx1, as a transcription-inhibitory factor, has about 20% of the binding sites of Msx1 in the genome (these binding sites are located almost in the inhibitory target gene) in or in the LADs. In contrast,68% to 71% of LADs contain at least one Msx1 binding site, and up to 75% of LADs contain at least one Msx1 binding site in the LDS combined with the nuclear nuclear week. Myo D, which is mainly used as a transcription activator, has a much lower binding site in the genome than Msx1, but it is less in the LADs or overlaps with Msx1; and the LAMDs containing at least one of the Myo D binding sites are also significantly less. This indicates that the binding site of Msx1 on the inhibitory target gene tends to be distributed within the LADs, which provides a new way for studying the mechanism of Msx1 to inhibit the target gene in the future.
【作者单位】: 复旦大学生命科学学院遗传工程国家重点实验室;
【基金】:上海市浦江人才计划(14PJ1401300) 上海高校特聘教授(东方学者)岗位计划(TP2015009)共同资助
【分类号】:Q78
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