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Unstable translocations: a new case?

T Mattina1, G Milana, A D'Agata

  • 1Istituto Clinica Pediatrica, University of Catania, Italy.

Clinical Genetics
|February 1, 1991
PubMed
Summary
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This study reports a female patient with Down syndrome caused by an unbalanced Robertsonian translocation (14;21). The father carried a balanced Robertsonian t(13;14), suggesting a complex origin for the translocation in the child.

Area of Science:

  • Genetics
  • Human genetics
  • Cytogenetics

Background:

  • Down syndrome is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21.
  • Robertsonian translocations are a type of chromosomal rearrangement that can lead to genetic imbalances.
  • Understanding the origin of chromosomal abnormalities is crucial for genetic counseling.

Observation:

  • A female patient presented with Down syndrome.
  • The patient's karyotype revealed an unbalanced Robertsonian translocation involving chromosomes 14 and 21 (t(14;21)).
  • Her father was a carrier of a balanced Robertsonian translocation t(13;14), and her mother had a normal karyotype.

Findings:

  • The unbalanced t(14;21) in the patient is linked to Down syndrome.

Related Experiment Videos

  • The father's balanced t(13;14) indicates a familial predisposition to chromosomal rearrangements.
  • The specific mechanism leading to the unbalanced translocation in the daughter requires further investigation.

    • Implications:

    • This case highlights the importance of detailed family history and parental karyotyping in cases of Down syndrome.
    • Identifying the origin of translocations aids in assessing recurrence risks for future pregnancies.
    • Further research into translocation inheritance patterns can improve genetic diagnostics and counseling.