Segregation of a familial balanced (12;10) insertion resulting in dup(10)(q21.2q22.1) and Del(10)(q21.2q22.1) in First cousins

Kimberly F. Doheny, Sonja A. Rasmussen, Julie Rutberg, Gregg L. Semenza, Judith Stamberg, Marcia Schwartz, Denise A.S. Batista, Gail Stetten, George H. Thomas

Research output: Contribution to journalArticle

Abstract

An interchromosomal insertion in 3 generations of a family was ascertained through two developmentally delayed first cousins. Cytogenetic analysis using G-banding and chromosome painting showed an apparently balanced direct insertion of chromosome 10 material into chromosome 12, ins(12;10)(q15;q21.2q22.1), in the mothers and grandfather of these children. The proposita inherited only the derivative 10 chromosome, resulting in deletion of 10q21.2 → 22.1 while her cousin inherited only the derivative 12, resulting in duplication of 10q21.2 → 22.1. A comparison of the proposita with published deletion cases suggests a pattern of anomalies attributable to deletion of the 10q21 → q22 region: developmental delay, hypotonia, a heart murmur, telecanthus, broad nasal root and ear abnormalities. This is the first report of a nontandem duplication of the 10q21 → q22 region. The phenotype of the cousin with the duplication does not overlap greatly with published tandem 10q duplications. Finally, this report reaffirms the importance of obtaining family studies of patients with interstitial chromosomal abnormalities.

Original languageEnglish (US)
Pages (from-to)188-193
Number of pages6
JournalAmerican journal of medical genetics
Volume69
Issue number2
DOIs
StatePublished - Mar 17 1997

Keywords

  • chromosome 10
  • del(10)(q21.2q22.1)
  • insertion
  • translocation

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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