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Tetraploidy in a liveborn infant.

I López Pajares1, A Delicado, A Diaz de Bustamante

  • 1Laboratory of Medical Genetics, Hospital La Paz, Madrid, Spain.

Journal of Medical Genetics
|December 1, 1990
PubMed
Summary

A rare tetraploidy case in a 3-month-old boy revealed severe growth and neurodevelopment delays, plus a cleft lip. This case is the seventh documented liveborn infant with a 92,XXYY karyotype.

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Area of Science:

  • Genetics
  • Developmental Biology
  • Pediatrics

Background:

  • Tetraploidy, a condition of having four sets of chromosomes, is extremely rare in liveborn infants.
  • Most tetraploidy cases result in early miscarriage, making live births exceptionally uncommon.

Observation:

  • A 3-month-old male infant presented with severe growth and neurodevelopmental delays.
  • Physical examination revealed a cleft lip, a feature not previously associated with this karyotype.

Findings:

  • Karyotype analysis of peripheral blood and skin fibroblasts confirmed tetraploidy (92,XXYY).
  • This represents the seventh documented case of a liveborn infant with a 92,XXYY karyotype.
  • The combination of tetraploidy, severe developmental delays, and cleft lip is a novel observation.

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Implications:

  • This case expands the known phenotypic spectrum of tetraploidy in liveborn infants.
  • Further research is needed to understand the mechanisms underlying tetraploidy and its varied clinical manifestations.
  • Highlights the importance of genetic analysis in cases of severe congenital anomalies and developmental delays.