22q11.2q13 duplication including SOX10 causes sex-reversal and peripheral demyelinating neuropathy, central dysmyelinating leukodystrophy, Waardenburg syndrome, and Hirschsprung disease

Am J Med Genet A. 2017 Apr;173(4):1066-1070. doi: 10.1002/ajmg.a.38109.

Abstract

Diagnosis of genetic syndromes may be difficult when specific components of a disorder manifest at a later age. We present a follow up of a previous report [Seeherunvong et al., (2004); AJMGA 127: 149-151], of an individual with 22q duplication and sex-reversal syndrome. The subject's phenotype evolved to include peripheral and central demyelination, Waardenburg syndrome type IV, and Hirschsprung disease (PCWH; MIM 609136). DNA microarray analysis defined the duplication at 22q11.2q13, including SOX10. Sequencing of the coding region of SOX10 did not reveal any mutations. Our data suggest that SOX10 duplication can cause disorders of sex development and PCWH, supporting the hypothesis that SOX10 toxic gain of function rather than dominant negative activity underlies PCWH.

Keywords: 22q duplication syndrome; WS4; Waardenburg syndrome; Waardenburg-Shah syndrome; central demyelinating leukodystrophy; peripheral demyelinating neuropathy.

Publication types

  • Case Reports

MeSH terms

  • 46, XX Testicular Disorders of Sex Development*
  • African Americans
  • Chromosome Duplication
  • Chromosomes, Human, Pair 22 / chemistry*
  • Demyelinating Diseases / diagnosis
  • Demyelinating Diseases / ethnology
  • Demyelinating Diseases / genetics*
  • Demyelinating Diseases / pathology
  • Hirschsprung Disease / diagnosis
  • Hirschsprung Disease / ethnology
  • Hirschsprung Disease / genetics*
  • Hirschsprung Disease / pathology
  • Humans
  • Kidney Failure, Chronic / diagnosis
  • Kidney Failure, Chronic / ethnology
  • Kidney Failure, Chronic / genetics*
  • Kidney Failure, Chronic / pathology
  • Male
  • Pelizaeus-Merzbacher Disease / diagnosis
  • Pelizaeus-Merzbacher Disease / ethnology
  • Pelizaeus-Merzbacher Disease / genetics*
  • Pelizaeus-Merzbacher Disease / pathology
  • SOXE Transcription Factors / genetics
  • Waardenburg Syndrome / diagnosis
  • Waardenburg Syndrome / ethnology
  • Waardenburg Syndrome / genetics*
  • Waardenburg Syndrome / pathology

Substances

  • SOX10 protein, human
  • SOXE Transcription Factors

Supplementary concepts

  • Leukodystrophy, Demyelinating, Adult-Onset, Autosomal Dominant
  • Waardenburg syndrome, type 4