Cri-du-chat syndrome cytogenetically cryptic recombination aneusomy of chromosome 5: Implications in recurrence risk estimation

Y. Ohnuki, C. Torii, R. Kosaki, T. Yagihashi, H. Sago, K. Hayashi, K. Yasukawa, Takao Takahashi, Kenjiro Kosaki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Cri-du-chat syndrome is caused by haploinsufficiency of the genes on the distal part of the short arm of chromosome 5, and characteristic features include microcephaly, developmental delays, and a distinctive high-pitched mewing cry. Most cri-du-chat syndrome cases result from a sporadic de novo deletion that is associated with a low recurrence risk. On rare occasions, however, cri-du-chat syndrome with 5p monosomy can be accompanied by 5q trisomy. This combination is virtually always associated with parental large pericentric inversions. Among previously reported cri-du-chat syndrome cases with 5p monosomy accompanied by 5q trisomy, the aneusomy of chromosome 5 in all but one case was cytogenetically visible using G-banding. When an accompanying 5q trisomy is detected, a significant recurrence risk is expected. We here report on a patient with cri-du-chat syndrome phenotype who initially exhibited a normal karyotype on G-banding but in whom molecular analysis using multiplex ligation-dependent probe amplification and array comparative genomic hybridization revealed a 5p deletion accompanied by a 5q duplication. Parental chromosomal testing led to the identification of a very large pericentric inversion, of which breakpoints resided at the terminal regions of 5p15.31 and 5q35.1. This information was vital for counseling the family regarding the significantly high recurrence risk.

Original languageEnglish
Pages (from-to)95-98
Number of pages4
JournalMolecular Syndromology
Volume1
Issue number2
DOIs
Publication statusPublished - 2010

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Cri-du-Chat Syndrome
Chromosomes, Human, Pair 5
Genetic Recombination
Recurrence
Haploinsufficiency
Microcephaly
Comparative Genomic Hybridization
Multiplex Polymerase Chain Reaction
Karyotype
Counseling
Phenotype
Trisomy 5q Chromosome 5
Genes

Keywords

  • Genetic counseling
  • Monosomy 5p
  • Trisomy 5q

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

Cite this

Cri-du-chat syndrome cytogenetically cryptic recombination aneusomy of chromosome 5 : Implications in recurrence risk estimation. / Ohnuki, Y.; Torii, C.; Kosaki, R.; Yagihashi, T.; Sago, H.; Hayashi, K.; Yasukawa, K.; Takahashi, Takao; Kosaki, Kenjiro.

In: Molecular Syndromology, Vol. 1, No. 2, 2010, p. 95-98.

Research output: Contribution to journalArticle

Ohnuki, Y. ; Torii, C. ; Kosaki, R. ; Yagihashi, T. ; Sago, H. ; Hayashi, K. ; Yasukawa, K. ; Takahashi, Takao ; Kosaki, Kenjiro. / Cri-du-chat syndrome cytogenetically cryptic recombination aneusomy of chromosome 5 : Implications in recurrence risk estimation. In: Molecular Syndromology. 2010 ; Vol. 1, No. 2. pp. 95-98.
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