DiGeorge anomaly in a patient with isochromosome 18p born to a diabetic mother

Ralph J. DeBerardinis, Livija Medne, Nancy B. Spinner, Elaine H. Zackai

Research output: Contribution to journalReview articlepeer-review

7 Scopus citations


The DiGeorge anomaly (DGA) is an etiologically heterogeneous developmental field defect in which cardiovascular malformations, hypocalcemia, thymic hypoplasia, and characteristic dysmorphisms are major clinical features. The 22q11.2 deletion is the most common single etiology of DGA, although a number of other chromosomal abnormalities and teratogens, including maternal diabetes, have been implicated as well. We present a patient, born to a diabetic mother, with interrupted aortic arch type B (IAA-B), neonatal hypocalcemia, thymic hypoplasia, and dysmorphic features including microcephaly, thick, overfolded helices, and anteriorly-placed anus. Cytogenetic studies showed the presence of a marker chromosome, identified by fluorescence in-situ hybridization (FISH) as an isochromosome 18p [i(18p)]. We did not detect a 22q11.2 deletion by FISH using a cosmid probe corresponding to locus D22S75. The patient is the first example of either DGA or IAA-B in a patient with i(18p). We review the genetic abnormalities associated with DGA, and discuss the potential contributions of maternal diabetes and i(18p) in our patient.

Original languageEnglish (US)
Pages (from-to)155-159
Number of pages5
JournalAmerican Journal of Medical Genetics
Volume138 A
Issue number2
StatePublished - Oct 1 2005


  • DiGeorge anomaly
  • Fluorescence in situ hybridization
  • Interrupted aortic arch type B
  • Isochromosome 18p
  • Maternal diabetes

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)


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