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SIX1 mutation screening in 247 branchio‐oto‐renal syndrome families: a recurrent missense mutation associated with BOR
Author(s) -
Kochhar Amit,
Orten Dana J.,
Sorensen Jessica L.,
Fischer Stephanie M.,
Cremers Cor W. R. J.,
Kimberling William J.,
Smith Richard J.H.
Publication year - 2008
Publication title -
human mutation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 162
eISSN - 1098-1004
pISSN - 1059-7794
DOI - 10.1002/humu.20714
Subject(s) - missense mutation , phenotype , biology , genetics , hearing loss , mutation , branchial arch , gene , medicine , audiology , embryo
Branchio‐oto‐renal syndrome (BOR) is a clinically heterogeneous autosomal dominant form of syndromic hearing loss characterized by variable hearing impairment, malformations of the pinnae, the presence of branchial arch remnants, and various renal abnormalities. Both EYA1 and SIX1 are expressed in developing otic, branchial and renal tissue. Consistent with this expression pattern, mutations in both genes cause BOR syndrome. Mutations in EYA1 are found in approximately 40% of patients with the BOR phenotype, however, the role of SIX1 is much lower. To date only three different SIX1 mutations have been described in BOR patients. The current screen of 247 BOR families detected five novel SIX1 mutations (c.50T>A, c.218A>C, c.317T>G, c.329G>A, c.334C>T) and one previously reported mutation (c.328C>T) seen in 5 unrelated families. All mutations are within the protein‐binding Six domain. Phenotypic variability was high in these BOR families. Seven of the eight known SIX1 mutations are missense and the one in frame deletion is predicted to be functionally similar. The wide phenotypic variability precludes making genotype‐phenotype correlations at this time. © 2008 Wiley‐Liss, Inc.