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Hum Mol Genet:脆性X智力低下蛋白调节神经元轴突发育的研究取得新进展

2017-12-08 佚名 中科院遗传所

脆性X染色体综合症(Fragile X syndrome, FXS)是常见的遗传性智力障碍疾病,由脆性X智力低下蛋白(Fragile X mental retardation protein,FMRP)功能缺失所引起。FMRP作为RNA结合蛋白,能够与大量的神经发育相关基因的mRNA直接结合并调控蛋白合成及功能,进而影响神经元树突及树突棘发育和突触可塑性。目前的研究提示,长链非编码RNA (Lon

脆性X染色体综合症(Fragile X syndrome, FXS)是常见的遗传性智力障碍疾病,由脆性X智力低下蛋白(Fragile X mental retardation protein,FMRP)功能缺失所引起。FMRP作为RNA结合蛋白,能够与大量的神经发育相关基因的mRNA直接结合并调控蛋白合成及功能,进而影响神经元树突及树突棘发育和突触可塑性。目前的研究提示,长链非编码RNA (Long non-coding RNAs, LncRNAs)的表达异常可能是FXS的致病因素之一。然而,FMRP与LncRNAs的互作在神经发育中的作用仍不清楚。

中国科学院遗传与发育生物学研究所郭伟翔研究组针对FMRP与LncRNA Tug1在神经元轴突发育中的功能展开研究。在FMPR敲除小鼠的大脑中,LcnRNA TUG1的表达水平显着上调。RNA-immunoprecipitation实验结果证明FMRP能够与TUG1互作并降低其稳定性,提示FMRP通过直接结合并负向调控TUG1的表达。在神经元过表达TUG1导致神经元的轴突长度下降,而树突的长度与复杂程度没发生变化,表明TUG1能够特异性调控神经元轴突发育。同时,在FMRP缺失的神经元中敲减TUG1的表达水平能够补救FMRP下调导致的轴突发育缺陷。进一步研究发现,TUG1能够与转录调控因子SnoN直接结合抑制其转录活性,而敲减FMRP及过表达TUG1都能够显着降低SnoN下游靶向基因Ccd1的表达水平。Ccd1过表达能够恢复FMRP缺失或者TUG1上调的神经元的轴突长度,证实FMRP与LncRNA TUG1相结合通SnoN-Ccd1信号通路调节神经元轴突发育。

该研究于2017年12月1日发表于Human Molecular Genetics杂志上,文章题目为”Interplay between FMRP and lncRNA TUG1 regulates axonal development through mediating SnoN-Ccd1 pathway”。该研究受到了国家自然科学基金项目、中科院前沿科学重点研究计划、北京脑计划及青年***的资助。

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    2018-02-20 canlab
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    2018-03-15 cy0324
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    2017-12-10 neurowu
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    2017-12-08 131****1460

    学习了受益匪浅

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