- Kelley P, Abe S, Askew J, Smith S, Usami S, Kimberling W. Human connexin 30 (GJB6), a candidate gene for nonsyndromic hearing loss: molecular cloning, tissue-specific expression, and assignment to chromosome 13q12. Genomics. 1999;62:172-6 pubmed..In addition, 23 dominant hearing loss families and 6 singleton families presumed to be recessive were tested. No significant mutation has been found in the dominant or recessive families. ..