Species-dependent posttranscriptional regulation of NOS1 by FMRP in the developing cerebral cortex.

Species-dependent posttranscriptional regulation of NOS1 by FMRP in the developing cerebral cortex.
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DOI:
10.1016/j.cell.2012.02.060
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发表时间:
2012-05-11
期刊:
影响因子:
64.5
通讯作者:
Sestan N
Sestan N
中科院分区:
生物学1区
文献类型:
--
作者:
Kwan KY;Lam MM;Johnson MB;Dube U;Shim S;Rašin MR;Sousa AM;Fertuzinhos S;Chen JG;Arellano JI;Chan DW;Pletikos M;Vasung L;Rowitch DH;Huang EJ;Schwartz ML;Willemsen R;Oostra BA;Rakic P;Heffer M;Kostović I;Judaš M;Sestan N

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脆性X综合征(FXS)是智力残疾和自闭症的主要单基因原因,由RNA结合蛋白FMRP的功能丧失引起。在这里,我们表明,FMRP调节神经元型一氧化氮合酶1(NOS1)的翻译在发展中的人类新皮层。而NOS1 mRNA是普遍表达的,NOS1蛋白是短暂的共同表达与FMRP在早期突触在层和区域特异性亚群的锥体神经元。这些包括胎儿中期第5层皮质下投射神经元排列成交替列在前瞻性布罗卡区和orofacial运动皮层。人NOS1翻译通过与小鼠Nos1 mRNA中不存在的编码区结合基序相互作用被FMRP激活,小鼠Nos1 mRNA在小鼠锥体神经元中表达,但不能有效翻译。相应地,新皮质NOS1蛋白水平在发展中的人FXS病例中严重降低,但在FMRP缺陷小鼠中则没有。因此,在FMRP转录后调节NOS 1在发展中的新皮层电路的改变可能有助于认知功能障碍FXS。
Fragile X syndrome (FXS), the leading monogenic cause of intellectual disability and autism, results from loss of function of the RNA-binding protein FMRP. Here we show that FMRP regulates the translation of neuronal nitric oxide synthase 1 (NOS1) in the developing human neocortex. Whereas NOS1 mRNA is ubiquitously expressed, NOS1 protein is transiently co-expressed with FMRP during early synaptogenesis in layer- and region-specific subpopulations of pyramidal neurons. These include mid-fetal layer 5 subcortically projecting neurons arranged into alternating columns in the prospective Broca’s area and orofacial motor cortex. Human NOS1 translation is activated by FMRP via interactions with coding region binding motifs absent from mouse Nos1 mRNA, which is expressed in mouse pyramidal neurons, but not efficiently translated. Correspondingly, neocortical NOS1 protein levels are severely reduced in developing human FXS cases but not FMRP-deficient mice. Thus, alterations in FMRP post-transcriptional regulation of NOS1 in developing neocortical circuits may contribute to cognitive dysfunction in FXS.
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