Functional studies of MLC1 mutations in Chinese patients with megalencephalic leukoencephalopathy with subcortical cysts.

Functional studies of MLC1 mutations in Chinese patients with megalencephalic leukoencephalopathy with subcortical cysts.
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中国患有皮质下囊肿的巨脑白质脑病患者 MLC1 突变的功能研究。

DOI:
10.1371/journal.pone.0033087
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Jiang Y
Jiang Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Xie H;Wang J;Dhaunchak AS;Shang J;Kou L;Guo M;Wu Y;Gu Q;Colman D;Wu X;Jiang Y

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巨脑白质脑病伴皮质下囊肿(MLC,MIM# 604004)是一种常染色体隐性遗传疾病,主要由MLC 1突变引起。本研究完成了中国人MLC 1基因突变的功能分析,包括5个新发现的错义突变(R22 Q,A32 V,G73 E,A275 T,Y278 H),1个已知的无义突变(Y198 X),2个已知的错义突变(S69 L,T118 M)。将野生型和突变型MLC 1转染U373 MG细胞后,发现MLC 1 wt定位于细胞周边,而突变型R22 Q、A32 V、G73 E、S69 L和T118 M则定位于内质网腔。与野生型相比,G73 E、T118 M、Y198 X和A275 T的转录水平降低,除R22 Q外,其余突变体的蛋白表达水平均降低。因此,我们提出,所有这八个MLC 1突变有功能的影响,无论是对他们的蛋白/mRNA的表达,或对他们的细胞内蛋白定位,或两者兼而有之。
Megalencephalic leukoencephalopathy with subcortical cysts (MLC, MIM# 604004) is an autosomal recessive inherited disease mostly resulting from MLC1 mutations. In this study, we finished the functional analysis of MLC1 mutations identified recently in Chinese patients, including five newly described missense mutations (R22Q, A32V, G73E, A275T, Y278H), one known nonsense mutation (Y198X), and two known missense mutations (S69L, T118M). We found MLC1wt was localized to the cell periphery, whereas mutant R22Q, A32V, G73E, S69L and T118M were trapped in the lumen of endoplasmic reticulum (ER) when we transfected the wild-type and mutant MLC1 in U373MG cells. Compared to wild type, the mutant G73E, T118M, Y198X and A275T transcript decreased and all mutants except R22Q had lower protein expression in transfected U373MG cells. Therefore, we propose that all these eight MLC1 mutations had functional effect either on their protein/mRNA expression, or on their intracellular protein localization, or both.
DOI: 10.1086/319519
发表时间: 2001-04-01
影响因子: 9.8
作者:
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