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Related Experiment Videos

[Balanced chromosome rearrangements with abnormal phenotype].

N Philip1, M G Mattei, M C Pellissier

  • 1Centre de Génétique Médicale, Hôpital d'enfants de la Timone, Marseille.

Journal De Genetique Humaine
|January 1, 1988
PubMed
Summary

Balanced chromosomal rearrangements, such as reciprocal translocations and pericentric inversions, are linked to phenotypic abnormalities including intellectual disability and non-specific dysmorphism. Genetic counseling for these cases depends on whether the rearrangement is inherited or de novo.

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Area of Science:

  • Human Genetics
  • Clinical Cytogenetics
  • Medical Genomics

Context:

  • Balanced chromosomal rearrangements (BCRs) are structural variations in chromosomes that appear normal but can lead to abnormal phenotypes.
  • Reciprocal translocations and pericentric inversions are common types of BCRs.
  • Phenotypic abnormalities associated with BCRs often include intellectual disability and non-specific dysmorphism.

Purpose:

  • To report and compare 27 new cases of apparent balanced chromosomal rearrangements associated with phenotypic abnormalities.
  • To analyze the clinical presentation and genetic counseling implications of these rearrangements.
  • To provide guidance on managing unexpected structural rearrangements found in prenatal diagnosis.

Summary:

  • This study reports 27 cases of apparent balanced chromosomal rearrangements (reciprocal translocations, pericentric inversions) linked to phenotypic abnormalities.

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  • The majority of affected patients exhibit intellectual disability and non-specific dysmorphism.
  • Genetic counseling strategies differ based on whether the chromosomal abnormality is inherited or de novo.

    • Impact:

    • Highlights the significant clinical impact of apparently balanced chromosomal rearrangements.
    • Emphasizes the importance of parental chromosomal studies in cases of de novo rearrangements.
    • Informs genetic counseling and clinical management for individuals with chromosomal abnormalities and their families.