A MUTATION IN THE REGULATORY REGION OF GJB2 MEDIATES NEONATAL HEARING LOSS WITHIN DFNB1

摘要

Homozygous alterations in the gap junction protein GJB2 (connexin 26), within the DFNB1 locus, are responsible for up to 50% of autosomal recessive non-syndromic hearing impairment (NSHI). Analysis of the GJB2 promoter revealed the potential importance of T-228C in the regulation of GJB2 expression. Of regulatory factors known to be expressed in the inner ear, the T-228C transition would delete potential binding sites for the X-box binding protein (RFX1) and the H6 homeobox 3 (HMX3/Nk×5.1) transcription factor which has been linked to hearing impairment. These results suggest that T-228C may represent the most common mutation associated with development of NSHI in Caucasian populations identified to date and should be included in worldwide newborn screening programs for NSHI.