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Genomic microarrays in mental retardation: from copy number variation to gene, from research to diagnosis
  1. Lisenka E L M Vissers1,
  2. Bert B A de Vries1,2,
  3. Joris A Veltman1
  1. 1Department of Human Genetics, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
  2. 2Department of Clinical Genetics, University Medical Centre Nijmegen, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
  1. Correspondence to Dr Lisenka Vissers, Department of Human Genetics-855, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, PO Box 9101, Nijmegen 6500 HB, The Netherlands; l.vissers{at}antrg.umcn.nl

Abstract

Structural chromosomal rearrangements can lead to a wide variety of serious clinical manifestations, including mental retardation (MR) and congenital malformations. Over the last few years, rearrangements below the detection level of conventional karyotyping have been proved to contribute significantly to the cause of MR. These so-called copy number variations are now routinely being detected using various high-resolution microarray platforms targeting the entire human genome. In addition to their clinical diagnostic use, the introduction of these high resolution platforms has facilitated identification of novel microdeletion and microduplication syndromes as well as disease genes. The aims of this review are to address several aspects of this revolutionising technology including its application in the diagnostics of MR, the identification of novel microdeletion and microduplication syndromes, and the finding of causative genes for known syndromes. In addition, a future prospect is provided for the detection of disease causing mutations and structural variants by next generation sequencing technologies.

  • Microarray
  • CNV
  • gene discovery
  • microdeletion syndromes
  • mental retardation
  • genetics
  • clinical genetics
  • cytogenetics
  • molecular genetics
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Footnotes

  • Funding Other funders: Netherlands Organisation for Health Research and Development and European Commission under FP6.

  • Competing interests None.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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