A functional alternative splicing mutation in AIRE gene causes autoimmune polyendocrine syndrome type 1.

A functional alternative splicing mutation in AIRE gene causes autoimmune polyendocrine syndrome type 1.
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AIRE 基因中的功能性选择性剪接突变导致 1 型自身免疫性多内分泌综合征。

DOI:
10.1371/journal.pone.0053981
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Xing Q
Xing Q
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhang J;Liu H;Liu Z;Liao Y;Guo L;Wang H;He L;Zhang X;Xing Q

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自身免疫性多内分泌综合征1型(APS-1)是一种罕见的常染色体隐性遗传病,存在三种情况中的两种:皮肤粘膜念珠菌病、甲状旁腺功能低下和Addison病。自身免疫调节(AIRE)基因的功能丧失突变与APS-1有关。在这里,我们报告了一个具有APS-1的中国近亲家族的AIRE突变的突变分析和功能特征。AIRE基因的所有外显子和邻近的外显子-内含子序列通过PCR扩增并随后测序。我们在两个具有不同APS-1临床特征的兄弟姐妹中发现了一个纯合错义突变c.463G> a (p.Gly155Ser)。通过硅剪接位点预测和微基因分析来研究潜在的病理后果。miniigene剪接分析和随后的cDNA测序显示,AIRE突变可能损害了对内含子3剪接供体的识别,导致内含子3保留替代pre-mRNA剪接。此外,在c.463G> a突变的杂合载体中发现了异常AIRE转录本。异常内含子3保留转录物产生一个截断蛋白(p.G155fsX203),包含前154个AIRE氨基酸和随后的48个异常氨基酸。因此,我们的研究代表了可选剪接AIRE突变的第一个功能特征,该突变可能解释APS-1的发病作用。
Autoimmune polyendocrine syndrome type 1 (APS-1) is a rare autosomal recessive disease defined by the presence of two of the three conditions: mucocutaneous candidiasis, hypoparathyroidism, and Addison’s disease. Loss-of-function mutations of the autoimmune regulator (AIRE) gene have been linked to APS-1. Here we report mutational analysis and functional characterization of an AIRE mutation in a consanguineous Chinese family with APS-1. All exons of the AIRE gene and adjacent exon-intron sequences were amplified by PCR and subsequently sequenced. We identified a homozygous missense AIRE mutation c.463G>A (p.Gly155Ser) in two siblings with different clinical features of APS-1. In silico splice-site prediction and minigene analysis were carried out to study the potential pathological consequence. Minigene splicing analysis and subsequent cDNA sequencing revealed that the AIRE mutation potentially compromised the recognition of the splice donor of intron 3, causing alternative pre-mRNA splicing by intron 3 retention. Furthermore, the aberrant AIRE transcript was identified in a heterozygous carrier of the c.463G>A mutation. The aberrant intron 3-retaining transcript generated a truncated protein (p.G155fsX203) containing the first 154 AIRE amino acids and followed by 48 aberrant amino acids. Therefore, our study represents the first functional characterization of the alternatively spliced AIRE mutation that may explain the pathogenetic role in APS-1.
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