Maternal balanced translocation leading to partial duplication of 4q and partial deletion of 1p in a son: Cytogenetic and FISH studies using band-specific painting probes generated by chromosome microdissection

Zhong Chen, Theresa A. Grebe, Xin Yuan Guan, Mathilda Notohamiprodjo, Pamela J. Nutting, John F. Stone, Jeffrey M. Trent, Avery A. Sandberg

Research output: Contribution to journalArticlepeer-review

Abstract

A 9-month-old boy with pre- and post-natal growth retardation, microcephaly, plagiocephaly, and several minor anomalies had the initial karyotype: 46,XY,der(1)t(1;?) (p36.1;?). Further analysis showed that the der(1) was derived from an unfavorable segregation of a maternal complex chromosome rearrangement, i.e., 46,XX,der(1)t(1;?) (p36.1;?), der(4)t(4;?)(q?;?). Whole chromosome fluorescence in situ hybridization (FISH) and chromosome microdissection were used to clarify the maternal karyotype as: 46,XX,der(1)t(1;4) (4qter→4q33:: 1p36.13→1qter),der(4)t(1;4)inv(4)(4pter→ 4q31.3::1p36.33→1p36.13::4q33→4q31.3:: 1p36.33→1pter). Therefore, the karyotype of the boy actually was 46,XY,der(1)t(1;4) (p36.13;q33). Clinical comparison of the patient's clinical findings showed similarities to individuals with partial del(1p) and dup(4q). To our knowledge the above cytogenetic abnormalities have not been described previously. This case further demonstrates the advantages of chromosome microdissection and FISH in the identification of anomalous chromosomes regions and breakpoints.

Original languageEnglish (US)
Pages (from-to)160-166
Number of pages7
JournalAmerican Journal of Medical Genetics
Volume71
Issue number2
DOIs
StatePublished - Aug 8 1997

Keywords

  • Chromosome microdissection
  • Chromosome translocation
  • Del(1p)
  • Dup(4q)
  • FISH

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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