3q29 Microdeletion: A mental retardation disorder unassociated with a recognizable phenotype in two mother-daughter pairs

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Abstract

The 3q29 microdeletion syndrome (del 3q29) is a novel genomic disorder identified after the introduction of microarray-based technology. The phenotype of the reported patients is variable, including mental retardation and subtle facial anomalies. We report on two mother-daughter pairs, heterozygous for 3q29, and review clinical features of all known affected individuals. Del 3q29 syndrome is associated with nonspecific clinical features, including mild-to-moderate developmental delay, microcephaly, and mild facial dysmorphisms such as short philtrum and high nasal bridge. Facial anomalies were nonoverlapping and nondistinct, also within each mother-daughter pair. Parental transmission of del 3q29 could be more frequent than previously considered. Malformations are rare, occurring only in single subjects. The phenotypic diversity of affected patients and the lack of distinct dysmorphisms suggest that this disorder cannot be recognized on clinical ground alone. Del 3q29 should be searched in subjects with unexplained mild/moderate mental retardation, microcephaly, and minor nonspecific facial anomalies.

Original languageEnglish
Pages (from-to)1777-1781
Number of pages5
JournalAmerican Journal of Medical Genetics, Part A
Volume149
Issue number8
DOIs
Publication statusPublished - Aug 2009

Keywords

  • Array-CGH analysis
  • Deletion 3q29
  • Mental retardation
  • Microcephaly

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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