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XB-ART-1641
Hum Genet 2005 Oct 01;1176:528-35. doi: 10.1007/s00439-005-1332-x.
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A novel TMPRSS3 missense mutation in a DFNB8/10 family prevents proteolytic activation of the protein.

Wattenhofer M , Sahin-Calapoglu N , Andreasen D , Kalay E , Caylan R , Braillard B , Fowler-Jaeger N , Reymond A , Rossier BC , Karaguzel A , Antonarakis SE .


Abstract
Pathogenic mutations in TMPRSS3, which encodes a transmembrane serine protease, cause non-syndromic deafness DFNB8/10. Missense mutations map in the low density-lipoprotein receptor A (LDLRA), scavenger-receptor cysteine-rich (SRCR), and protease domains of the protein, indicating that all domains are important for its function. TMPRSS3 undergoes proteolytic cleavage and activates the ENaC sodium channel in a Xenopus oocyte model system. To assess the importance of this gene in non-syndromic childhood or congenital deafness in Turkey, we screened for mutations affected members of 25 unrelated Turkish families. The three families with the highest LOD score for linkage to chromosome 21q22.3 were shown to harbor P404L, R216L, or Q398X mutations, suggesting that mutations in TMPRSS3 are a considerable contributor to non-syndromic deafness in the Turkish population. The mutant TMPRSS3 harboring the novel R216L missense mutation within the predicted cleavage site of the protein fails to undergo proteolytic cleavage and is unable to activate ENaC, thus providing evidence that pre-cleavage of TMPRSS3 is mandatory for normal function.

PubMed ID: 16021470
Article link: Hum Genet


Species referenced: Xenopus
Genes referenced: tmprss3 tmprss4

Disease Ontology terms: autosomal recessive nonsyndromic deafness 8
OMIMs: DEAFNESS, AUTOSOMAL RECESSIVE 8; DFNB8
References [+] :
Afar, Catalytic cleavage of the androgen-regulated TMPRSS2 protease results in its secretion by prostate and prostate cancer epithelia. 2001, Pubmed