HP1-beta is required for development of the cerebral neocortex and neuromuscular junctions.

HP1-beta is required for development of the cerebral neocortex and neuromuscular junctions.
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DOI:
10.1083/jcb.200804041
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发表时间:
2008-11-17
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Singh PB
Singh PB
中科院分区:
其他
文献类型:
--
作者:
Aucott R;Bullwinkel J;Yu Y;Shi W;Billur M;Brown JP;Menzel U;Kioussis D;Wang G;Reisert I;Weimer J;Pandita RK;Sharma GG;Pandita TK;Fundele R;Singh PB

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HP 1蛋白被认为是所有哺乳动物中染色质组织的调节剂,但其确切的生理功能仍然未知。在第一次试图阐明这些蛋白质在体内的功能时,我们破坏了编码HP 1-β同种型的小鼠Cbx 1基因,并表明Cbx 1 −/−-无效突变导致围产期致死。新生小鼠死于急性呼吸衰竭,其可能的原因是膈肌终板内神经肌肉接头的发育缺陷。我们还观察到Cbx 1 −/−突变大脑中异常的大脑皮层发育,神经元前体细胞增殖减少,广泛的细胞死亡和水肿。来自Cbx 1 −/−突变大脑的神经球的体外培养揭示了显着的基因组不稳定性。我们的研究结果表明,HP 1蛋白在功能上是不冗余的,他们很可能调节异染色质组织的谱系特异性变化。
HP1 proteins are thought to be modulators of chromatin organization in all mammals, yet their exact physiological function remains unknown. In a first attempt to elucidate the function of these proteins in vivo, we disrupted the murine Cbx1 gene, which encodes the HP1-β isotype, and show that the Cbx1−/−-null mutation leads to perinatal lethality. The newborn mice succumbed to acute respiratory failure, whose likely cause is the defective development of neuromuscular junctions within the endplate of the diaphragm. We also observe aberrant cerebral cortex development in Cbx1−/− mutant brains, which have reduced proliferation of neuronal precursors, widespread cell death, and edema. In vitro cultures of neurospheres from Cbx1−/− mutant brains reveal a dramatic genomic instability. Our results demonstrate that HP1 proteins are not functionally redundant and that they are likely to regulate lineage-specific changes in heterochromatin organization.
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