The phenotype of recurrent 10q22q23 deletions and duplications

Eur J Hum Genet. 2011 Apr;19(4):400-8. doi: 10.1038/ejhg.2010.211. Epub 2011 Jan 19.


The genomic architecture of the 10q22q23 region is characterised by two low-copy repeats (LCRs3 and 4), and deletions in this region appear to be rare. We report the clinical and molecular characterisation of eight novel deletions and six duplications within the 10q22.3q23.3 region. Five deletions and three duplications occur between LCRs3 and 4, whereas three deletions and three duplications have unique breakpoints. Most of the individuals with the LCR3-4 deletion had developmental delay, mainly affecting speech. In addition, macrocephaly, mild facial dysmorphisms, cerebellar anomalies, cardiac defects and congenital breast aplasia were observed. For congenital breast aplasia, the NRG3 gene, known to be involved in early mammary gland development in mice, is a putative candidate gene. For cardiac defects, BMPR1A and GRID1 are putative candidate genes because of their association with cardiac structure and function. Duplications between LCRs3 and 4 are associated with variable phenotypic penetrance. Probands had speech and/or motor delays and dysmorphisms including a broad forehead, deep-set eyes, upslanting palpebral fissures, a smooth philtrum and a thin upper lip. In conclusion, duplications between LCRs3 and 4 on 10q22.3q23.2 may lead to a distinct facial appearance and delays in speech and motor development. However, the phenotypic spectrum is broad, and duplications have also been found in healthy family members of a proband. Reciprocal deletions lead to speech and language delay, mild facial dysmorphisms and, in some individuals, to cerebellar, breast developmental and cardiac defects.

Publication types

  • Case Reports
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Abnormalities, Multiple / genetics*
  • Abnormalities, Multiple / pathology*
  • Adaptor Proteins, Signal Transducing / genetics
  • Animals
  • Body Dysmorphic Disorders / genetics
  • Body Dysmorphic Disorders / pathology
  • Bone Morphogenetic Protein Receptors, Type I / genetics
  • Child
  • Chromosome Deletion
  • Chromosomes, Human, Pair 10 / genetics*
  • DNA Copy Number Variations
  • Developmental Disabilities / genetics
  • Developmental Disabilities / pathology
  • Female
  • Humans
  • Language Development Disorders / genetics
  • Male
  • Megalencephaly / genetics
  • Megalencephaly / pathology
  • Mice
  • Natural Cytotoxicity Triggering Receptor 3 / genetics
  • Phenotype
  • Segmental Duplications, Genomic / genetics*


  • Adaptor Proteins, Signal Transducing
  • GRAP2 protein, human
  • NCR3 protein, human
  • Natural Cytotoxicity Triggering Receptor 3
  • BMPR1A protein, human
  • Bone Morphogenetic Protein Receptors, Type I