Whole-exome sequencing in a single proband reveals a mutation in the CHST8 gene in autosomal recessive peeling skin syndrome.

Whole-exome sequencing in a single proband reveals a mutation in the CHST8 gene in autosomal recessive peeling skin syndrome.
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DOI:
10.1016/j.ygeno.2012.01.005
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发表时间:
2012-04
期刊:
影响因子:
4.4
通讯作者:
Christiano, Angela M.
Christiano, Angela M.
中科院分区:
生物学3区
文献类型:
--
作者:
Cabral, Rita M.;Kurban, Mazen;Wajid, Muhammad;Shimomura, Yutaka;Petukhova, Lynn;Christiano, Angela M.

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泛发性皮肤脱皮综合征(PSS)是一种常染色体隐性遗传性皮肤病,其特征是上表皮终身持续脱落。利用全基因组纯合性作图和全外显子组测序,我们在一个患有非炎性PSS A型的大血缘家族中鉴定出CHST 8基因内的一个新的纯合错义突变(c.229C>T,R77 W)。CHST 8编码高尔基体跨膜N-乙酰半乳糖胺-4-O-磺基转移酶(GalNAc 4-ST 1),我们通过免疫荧光染色显示其在整个正常表皮中表达。比较表达野生型和突变型重组GalNAc 4-ST 1的人角质形成细胞(CCD 1106 KERTr)的总硫酸化糖胺聚糖(GAG)定量的比色测定显示,表达突变型GalNAc 4-ST 1的细胞中总硫酸化GAG水平降低,表明功能丧失。蛋白质印迹法显示,与野生型相比,突变型重组GalNAc 4-ST 1的表达水平较低,表明加速降解可能导致功能丧失,导致PSS A型。这是第一个报告描述突变的原因PSS A型。
Generalized peeling skin syndrome (PSS) is an autosomal recessive genodermatosis characterized by lifelong, continuous shedding of the upper epidermis. Using whole-genome homozygozity mapping and whole-exome sequencing, we identified a novel homozygous missense mutation (c.229C>T, R77W) within the CHST8 gene, in a large consanguineous family with non-inflammatory PSS type A. CHST8 encodes a Golgi transmembrane N-acetylgalactosamine-4-O-sulfotransferase (GalNAc4-ST1), which we show by immunofluorescence staining to be expressed throughout normal epidermis. A colorimetric assay for total sulfated glycosaminoglycan (GAG) quantification, comparing human keratinocytes (CCD1106 KERTr) expressing wild type and mutant recombinant GalNAc4-ST1, revealed decreased levels of total sulfated GAGs in cells expressing mutant GalNAc4-ST1, suggesting loss of function. Western blotting revealed lower expression levels of mutant recombinant GalNAc4-ST1 compared to wild type, suggesting that accelerated degradation may result in loss of function, leading to PSS type A. This is the first report describing a mutation as the cause of PSS type A.
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发表时间: 1986-06-01
影响因子: 6.5
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