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Identification of an unbalanced cryptic translocation t(9;17)(q34.3;p13.3) in a child with dysmorphic features
  1. A M Estop1,2,3,
  2. P A Mowery-Rushton3,4,
  3. K M Cieply1,2,
  4. S J Kochmar3,4,
  5. C R Sherer1,2,
  6. M Clemens3,4,
  7. U Surti3,4,5,
  8. E McPherson3,4
  1. 1Center for Medical Genetics, Allegheny Health, Research and Education Foundation, 320 East North Avenue, Pittsburgh, PA 15212, USA
  2. Medical College of Pennsylvania and Hahnemann University, Pittsburgh, PA, USA
  3. Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, PA, USA
  4. Department of Genetics, Magee Women's Hospital, Pittsburgh, PA, USA
  5. Department of Pathology, School of Medicine, University of Pittsburgh, PA, USA

    Abstract

    We report a case of an unbalanced cryptic telomeric translocation 46,XY,der(17),t(9;17)(q34.3;p13.3) in a boy with dysmorphic features and developmental delay. The proband had intrauterine growth retardation, postnatal short stature, and mild microcephaly. Magnetic resonance imaging showed incomplete myelination, but no evidence of lissencephaly. Cytogenetic analysis of the proband's peripheral blood showed an abnormal 17p. Fluorescence in situ hybridisation (FISH) with a Miller-Dieker cosmid probe did not detect a deletion for that area. Further analysis with a 17p telomere specific probe identified an unbalanced telomeric translocation. The same probe was used to determine the presence of an apparent balanced translocation t(9;17)(q34.3;p13.3) in the mother of the proband. The balanced translocation was confirmed with two cosmids that map distally on 9q34.3. Two phenotypically normal half sibs, a maternal aunt, a maternal uncle, and the maternal grandmother were found to be balanced translocation carriers as well. A subtle translocation carriers as well. A subtle translocation is one mechanism that can produce an abnormal phenotype in a patient who had a normal karyotype at lower band resolution levels.

    https://doi.org/10.1136/jmg.32.10.819

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