Mutations in POMT1 are found in a minority of patients with walker-warburg syndrome

Sophie C. Currier, Christine K. Lee, Bernard S. Chang, Adria L. Bodell, G. Shashidhar Pai, Leela Job, Lieven G. Lagae, Lihadh I. Al-Gazali, Wafaa M. Eyaid, Greg Enns, William B. Dobyns, Christopher A. Walsh

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

Walker-Warburg syndrome (WWS) is an autosomal recessive disorder of infancy characterized by hydrocephalus, agyria, retinal dysplasia, congenital muscular dystrophy, and over migration of neurons through a disrupted pial surface resulting in leptomeningeal heterotopia. Although previous work identified mutations in the o-mannosyl transferase, POMT1, in 6 out of 30 WWS families [Beltran-Valero de Bernabe et al., 2002], the incidence of POMT1 mutations in WWS is not known. We sequenced the entire coding region of POMT1 in 30 consecutive, unselected patients with classic WWS. Two novel heterozygous mutations were found in two patients from non-consanguineous parents, whereas 28 other patients failed to show any POMT1 mutations. One patient was found to be heterozygous for a transition, g.1233T > A, which predicts p.Y352X. A second patient was found also to be heterozygous for a transition g.1790C > G, which predicts p.S537R. As an additional determination of the frequency of the POMT1 mutations in WWS, we tested for linkage of WWS to POMT1 in six consanguineous families. All six demonstrated heterozygosity and negative LOD scores at the POMT1 locus. From these data we show that POMT1 is an uncommon cause of WWS, the incidence of coding region mutations in this population of WWS being less than 7%. We conclude that while the incidence of POMT1 mutations in WWS can be as high as 20% as reported by Beltran-Valero de Bernabe et al. [2002] and it can be as low as ∼7%, as reported here.

Original languageEnglish (US)
Pages (from-to)53-57
Number of pages5
JournalAmerican Journal of Medical Genetics
Volume133 A
Issue number1
DOIs
StatePublished - Feb 15 2005
Externally publishedYes

Keywords

  • CMD
  • Dystroglycan
  • Fukuyama congenital muscular dystrophy
  • Lissencephaly
  • Mannosylation
  • Muscle eye brain
  • Neuronal migration
  • POMT1
  • Walker-Warburg syndrome

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