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A homozygous reciprocal translocation, 46,XY,t(10;11),t(10;11), was detected in a boy with non-syndromic congenital sensorineural hearing impairment. Both parents and their four other children were heterozygous translocation carriers, 46,XX,t(10;11) and 46,XY,t(10;11), respectively. Fluorescence  in situ  hybridization of region-specific clones to patient chromosomes was used to localize the breakpoints within bacterial artificial chromosome (BAC) RP11-108L7 on chromosome 10q24.3 and within BAC CTD-2527F12 on chromosome 11q23.3. Junction fragments were cloned by vector ligation and sequenced. The chromosome 10 breakpoint was identified within the PDZ domain containing 7 ( PDZD7 ) gene, disrupting the open reading frame of transcript  PDZD7 -C (without PDZ domain) and the 5′-untranslated region of transcript  PDZD7 -D (with one PDZ and two prolin-rich domains). The chromosome 11 breakpoint was localized in an intergenic segment. Reverse transcriptase–polymerase chain reaction analysis revealed  PDZD7  expression in the human inner ear. A murine  Pdzd7  transcript that is most similar in structure to human  PDZD7 -D is known to be expressed in the adult inner ear and retina.  PDZD7  shares sequence homology with the PDZ domain-containing genes,  USH1C  (harmonin) and  DFNB31  (whirlin). Allelic mutations in harmonin and whirlin can cause both Usher syndrome (USH1C and USH2D, respectively) and congenital hearing impairment (DFNB18 and DFNB31, respectively). Protein–protein interaction assays revealed the integration of PDZD7 in the protein network related to the human Usher syndrome. Collectively, our data provide strong evidence that  PDZD7  is a new autosomal-recessive deafness-causing gene and also a prime candidate gene for Usher syndrome.

human molecular genetics

Homozygous disruption of  PDZD7  by reciprocal translocation in a consanguineous family: a new member of the Usher syndrome protein interactome causing congenital hearing impairment