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Genome-wide Association Study and Meta-Analysis Identify ISL1 as Genome-wide Significant Susceptibility Gene for Bladder Exstrophy

Author

Listed:
  • Markus Draaken
  • Michael Knapp
  • Tracie Pennimpede
  • Johanna M Schmidt
  • Anne-Karolin Ebert
  • Wolfgang Rösch
  • Raimund Stein
  • Boris Utsch
  • Karin Hirsch
  • Thomas M Boemers
  • Elisabeth Mangold
  • Stefanie Heilmann
  • Kerstin U Ludwig
  • Ekkehart Jenetzky
  • Nadine Zwink
  • Susanne Moebus
  • Bernhard G Herrmann
  • Manuel Mattheisen
  • Markus M Nöthen
  • Michael Ludwig
  • Heiko Reutter

Abstract

The bladder exstrophy-epispadias complex (BEEC) represents the severe end of the uro-rectal malformation spectrum, and is thought to result from aberrant embryonic morphogenesis of the cloacal membrane and the urorectal septum. The most common form of BEEC is isolated classic bladder exstrophy (CBE). To identify susceptibility loci for CBE, we performed a genome-wide association study (GWAS) of 110 CBE patients and 1,177 controls of European origin. Here, an association was found with a region of approximately 220kb on chromosome 5q11.1. This region harbors the ISL1 (ISL LIM homeobox 1) gene. Multiple markers in this region showed evidence for association with CBE, including 84 markers with genome-wide significance. We then performed a meta-analysis using data from a previous GWAS by our group of 98 CBE patients and 526 controls of European origin. This meta-analysis also implicated the 5q11.1 locus in CBE risk. A total of 138 markers at this locus reached genome-wide significance in the meta-analysis, and the most significant marker (rs9291768) achieved a P value of 2.13 × 10−12. No other locus in the meta-analysis achieved genome-wide significance. We then performed murine expression analyses to follow up this finding. Here, Isl1 expression was detected in the genital region within the critical time frame for human CBE development. Genital regions with Isl1 expression included the peri-cloacal mesenchyme and the urorectal septum. The present study identified the first genome-wide significant locus for CBE at chromosomal region 5q11.1, and provides strong evidence for the hypothesis that ISL1 is the responsible candidate gene in this region.Author Summary: The etiology of classic exstrophy of the bladder (CBE) remains unclear. The present genome-wide association study and meta-analysis identified an association between CBE and a region on chromosome 5q11.1. This region contains the gene encoding insulin gene enhancer protein, ISL-1. In this region, 138 single nucleotide polymorphisms (SNPs) reached genome-wide significance, with the SNP rs9291768 showing the lowest P value (p = 2.13 x 10−12). Our findings, as supported by expression analyses in murine models, suggest that ISL1 is a susceptibility gene for CBE.

Suggested Citation

  • Markus Draaken & Michael Knapp & Tracie Pennimpede & Johanna M Schmidt & Anne-Karolin Ebert & Wolfgang Rösch & Raimund Stein & Boris Utsch & Karin Hirsch & Thomas M Boemers & Elisabeth Mangold & Stefa, 2015. "Genome-wide Association Study and Meta-Analysis Identify ISL1 as Genome-wide Significant Susceptibility Gene for Bladder Exstrophy," PLOS Genetics, Public Library of Science, vol. 11(3), pages 1-13, March.
    • Handle: RePEc:plo:pgen00:1005024
    DOI: 10.1371/journal.pgen.1005024
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