Genome-wide linkage analysis of an autosomal recessive hypotrichosis identifies a novel P2RY5 mutation

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• 作者：Lynn Petukhova ; Edilson C. Sousa Jr. ; Amalia Martinez-Mir ; Anna Vitebsky ; Lina G. dos Santos ; Lawrence Shapiro ; Chad Haynes ; Derek Gordon ; Yutaka Shimomura ; Angela M. Christiano
• 关键词：P2RY5 ; G-protein-coupled receptor ; Autosomal recessive hypotrichosis ; Autosomal recessive woolly hair ; Variable expressivity
• 刊名：Genomics
• 出版年：2008
• 出版时间：November 2008
• 年：2008
• 卷：92
• 期：5
• 页码：273-278
• 全文大小：2565 K

文摘

While there have been significant advances in understanding the genetic etiology of human hair loss over the previous decade, there remain a number of hereditary disorders for which a causative gene has yet to be identified. We studied a large, consanguineous Brazilian family that presented with woolly hair at birth that progressed to severe hypotrichosis by the age of 5, in which 6 of the 14 offspring were affected. After exclusion of known candidate genes, a genome-wide scan was performed to identify the disease locus. Autozygosity mapping revealed a highly significant region of extended homozygosity (lod score of 10.41) that contained a haplotype with a linkage lod score of 3.28. Results of these two methods defined a 9-Mb region on chromosome 13q14.11–q14.2. The interval contains the P2RY5 gene, in which we recently identified pathogenic mutations in several families of Pakistani origin affected with autosomal recessive woolly and sparse hair. After the exclusion of several other candidate genes, we sequenced the P2RY5 gene and identified a homozygous mutation (C278Y) in all affected individuals in this family. Our findings show that mutations in P2RY5 display variable expressivity, underlying both hypotrichosis and woolly hair, and underscore the essential role of P2RY5 in the tissue integrity and maintenance of the hair follicle.