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Disomic balanced reciprocal translocation.

P L Wilmot1, L R Shapiro, A C Casamassima

  • 1Department of Pediatrics, New York Medical College, Valhalla.

Clinical Genetics
|August 1, 1990
PubMed
Summary
This summary is machine-generated.

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A unique genetic condition, complete disomy of a balanced reciprocal translocation, was found in a patient with infantile seizures. This occurred when both parents, who are related, passed on the same translocation, leading to potential gene imbalances.

Area of Science:

  • Genetics
  • Human Genetics
  • Medical Genetics

Background:

  • Balanced reciprocal translocations are chromosomal rearrangements typically considered benign in carriers.
  • Genetic inheritance patterns can be complex, especially in consanguineous families.
  • Understanding chromosomal abnormalities is crucial for diagnosing genetic disorders.

Observation:

  • A novel case of complete disomy for a balanced reciprocal translocation was identified.
  • The affected patient presented with infantile seizures.
  • Both parents, who were second cousins once removed, shared the identical balanced reciprocal translocation.

Findings:

  • The complete disomy resulted from each parent contributing the same balanced translocation chromosome.
  • Despite the translocation being balanced, a hemizygous state for certain genes on the translocation chromosomes is possible.

Related Experiment Videos

  • This hemizygosity, in a disomic homozygous state, may underlie the patient's abnormal phenotype.

    • Implications:

    • This case highlights a previously unreported mechanism for genetic imbalance leading to disease.
    • It underscores the importance of detailed genetic analysis even in cases of apparently balanced translocations.
    • Further research is needed to identify specific genes affected and their role in the observed phenotype.