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Isolated imprinting mutation of the DLK1/GTL2 locus associated with a clinical presentation of maternal uniparental disomy of chromosome 14
  1. Isabel Karen Temple (ikt{at}soton.ac.uk)
  1. Division of Human Genetics, University of Southampton, United Kingdom
    1. Valerie Shrubb (valerie.shrubb{at}scpct.nhs.uk)
    1. Ashurst Hospital, United Kingdom
      1. Margaret Lever (margaret.lever{at}salisbury.nhs.uk)
      1. Wessex Regional Genetics Laboratory, United Kingdom
        1. Hilary Bullman (hilary.bullman{at}salisbury.nhs.uk)
        1. Wessex Regional Genetics Laboratory, United Kingdom
          1. Deborah JG Mackay (djgm{at}soton.ac.uk)
          1. Division of Human Genetics, University of Southampton, United Kingdom

            Abstract

            The clinical phenotypes of maternal and paternal uniparental disomy of chromosome 14 (UPD14) are attributed to dysregulation of imprinted genes. A large candidate locus exists within 14q32, under the regulation of a paternally-methylated intergenic differentially methylated region (IG-DMR). We present a case with clinical features of maternal UPD14, including growth retardation, hypotonia, scoliosis, small hands and feet and advanced puberty, who had loss of methylation of the IG-DMR with no evidence of maternal UPD14. This case provides support for the hypothesis that the maternal UPD14 phenotype is due to aberrant gene expression within the imprinted domain at 14q32.

            • DLK1
            • DNA methylation
            • UPD14
            • imprinting

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