A reciprocal translocation 46,XY,t(8;9)(p11.2;q13) in a bladder exstrophy patient disrupts CNTNAP3 and presents evidence of a pericentromeric duplication on chromosome 9

Simeon A. Boyadjiev, Sarah T. South, Cristi L. Radford, Ankita Patel, George Zhang, David J. Hur, George H. Thomas, John P. Gearhart, Gail Stetten

Research output: Contribution to journalArticle

Abstract

A patient with sporadic bladder exstrophy and de novo apparently balanced chromosomal translocation 46,XY,t(8;9)(p11.2;q13) was analyzed by fluorescence in situ hybridization (FISH) and molecular methods. We were able to map both translocation breakpoints to single genomic clones. The chromosome 8p11.2 breakpoint was mapped to BAC clone RP4-547J18, predicted to contain several hypothetical genes. Characterization of the chromosome 9q13 breakpoint indicated a disruption in the 5′ region of CNTNAP3 within BAC RP11-292B8. This observation suggests possible involvement of CNTNAP3 in the etiology of bladder exstrophy. Additionally, FISH analysis identified several genomic copies of CNTNAP3 on both sides of the chromosome 9 centromere flanking the polymorphic heterochromatin. Northern blot analysis of lymphoblast and bladder RNA confirmed CNTNAP3 transcripts in these tissues and did not show abnormal CNTNAP3 expression in the proband and two unrelated patients with bladder exstrophy. The identification of multiple copies of three BAC clones in the proband, his parents, and unrelated controls suggests that duplications of CNTNAP3 and the surrounding genomic region have occurred as a result of repeated events of unequal crossing over and pericentric inversions during chromosome 9 evolution.

Original languageEnglish (US)
Pages (from-to)622-629
Number of pages8
JournalGenomics
Volume85
Issue number5
DOIs
StatePublished - May 2005

Keywords

  • Bladder exstrophy-epispadias complex
  • Chromosome 9
  • Contactin-associated protein-like 3 (CNTNAP3)
  • Translocation breakpoint mapping

ASJC Scopus subject areas

  • Genetics

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