It is perhaps more than a coincidence, therefore, that the genes for TRPV5 and TRPV6 are located on chromosome 7q35 and 7q33-34 respectively in human [4] and the locus of the non-syndromic deafness gene [32] DFNB13 is located at the encompassing region on chromosome 7q34-36 [33]. The gene discussed is TRPV6; the disease is deafness.