Referenced in: none

Automatically associated channels: TRP , TRPV , TRPV3

Title: Exome sequencing reveals mutations in TRPV3 as a cause of Olmsted syndrome.

Authors: Zhimiao Lin, Quan Chen, Mingyang Lee, Xu Cao, Jie Zhang, Donglai Ma, Long Chen, Xiaoping Hu, Huijun Wang, Xiaowen Wang, Peng Zhang, Xuanzhu Liu, Liping Guan, Yiquan Tang, Haizhen Yang, Ping Tu, Dingfang Bu, Xuejun Zhu, Kewei Wang, Ruoyu Li, Yong Yang

Journal, date & volume: Am. J. Hum. Genet., 2012 Mar 9 , 90, 558-64

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/22405088

Abstract
Olmsted syndrome (OS) is a rare congenital disorder characterized by palmoplantar and periorificial keratoderma, alopecia in most cases, and severe itching. The genetic basis for OS remained unidentified. Using whole-exome sequencing of case-parents trios, we have identified a de novo missense mutation in TRPV3 that produces p.Gly573Ser in an individual with OS. Nucleotide sequencing of five additional affected individuals also revealed missense mutations in TRPV3 (which produced p.Gly573Ser in three cases and p.Gly573Cys and p.Trp692Gly in one case each). Encoding a transient receptor potential vanilloid-3 cation channel, TRPV3 is primarily expressed in the skin, hair follicles, brain, and spinal cord. In transfected HEK293 cells expressing TRPV3 mutants, much larger inward currents were recorded, probably because of the constitutive opening of the mutants. These gain-of-function mutations might lead to elevated apoptosis of keratinocytes and consequent skin hyperkeratosis in the affected individuals. Our findings suggest that TRPV3 plays essential roles in skin keratinization, hair growth, and possibly itching sensation in humans and selectively targeting TRPV3 could provide therapeutic potential for keratinization or itching-related skin disorders.