22q11.2 microduplication in two patients with bladder exstrophy and hearing impairment

Research output: Contribution to journalArticle

Abstract

Bladder exstrophy is a congenital malformation of the bladder and urethra. The genetic basis of this malformation is unknown however it is well known that chromosomal aberrations can lead to defects in organ development. A few bladder exstrophy patients have been described to carry chromosomal aberrations. Chromosomal rearrangements of 22q11.2 are implicated in several genomic disorders i.e. DiGeorge/velocardiofacial- and cat-eye syndrome. Deletions within this chromosomal region are relatively common while duplications of 22q11.2 are much less frequently observed. An increasing number of reports of microduplications of this region describe a highly variable phenotype. We have performed array-CGH analysis of 36 Swedish bladder exstrophy patients. The analysis revealed a similar and approximately 3 Mb duplication, consistent with the recently described 22q11.2 microduplication syndrome, in two unrelated cases with bladder exstrophy and hearing impairment. This finding was confirmed by multiplex ligation-dependent probe amplification (MLPA) and FISH analysis. Subsequent MLPA analysis of this chromosomal region in 33 bladder exstrophy patients did not reveal any deletion/duplication within this region. MLPA analysis of 171 anonymous control individuals revealed one individual carrying this microduplication. This is the first report of 22q11.2 microduplication associated with bladder exstrophy and hearing impairment. Furthermore the finding of one carrier among a cohort of normal controls further highlights the variable phenotype linked to this microduplication syndrome. (C) 2010 Elsevier Masson SAS. All rights reserved.

Details

Authors
  • Johanna Lundin
  • Cilla Soderhall
  • Lina Lunden
  • Anna Hammarsjo
  • Irene White
  • Jacqueline Schoumans
  • Goran Lackgren
  • Christina Clementson Kockum
  • Agneta Nordenskjold
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Pediatrics

Keywords

  • 22q11.2 microduplication, Bladder exstrophy, Hearing impairment, syndrome, Array-CGH
Original languageEnglish
Pages (from-to)61-65
JournalEuropean Journal of Medical Genetics
Volume53
Issue number2
Publication statusPublished - 2010
Publication categoryResearch
Peer-reviewedYes