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Related Experiment Videos

[Pericentric inversions: studies in 47 cases].

F Giraud, J F Mattei, M G Mattei

    Journal De Genetique Humaine
    |June 1, 1979
    PubMed
    Summary
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    Pericentric inversions involving chromosomes 2, 11, and 9 increase the risk of birth defects and encephalopathy, warranting prenatal diagnosis. Inversions of chromosome 9's secondary constriction do not significantly raise this risk.

    Area of Science:

    • Human Genetics
    • Medical Genetics
    • Cytogenetics

    Context:

    • Pericentric inversions are chromosomal rearrangements affecting genetic material.
    • Understanding the clinical significance of these inversions is crucial for genetic counseling.
    • Previous studies have suggested varying risks associated with different chromosomal regions.

    Purpose:

    • To analyze the clinical outcomes and risks associated with pericentric inversions.
    • To determine the necessity of prenatal diagnosis for specific types of pericentric inversions.
    • To investigate the role of "position effect", "aneusomie de recombinaison", and "interchromosomal effect" in pericentric inversions.

    Summary:

    • The study reviewed 47 cases of pericentric inversions.
    • Eleven cases involved chromosomes 2, 11, and 9, showing an increased risk of malformations and encephalopathy due to "position effect", "aneusomie de recombinaison", or "interchromosomal effect", thus indicating the need for prenatal diagnosis.

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  • Thirty-six cases involved the secondary constriction of chromosome 9, where the risk was not sufficiently elevated to warrant prenatal diagnosis.

    • Impact:

    • Provides evidence for targeted prenatal diagnosis based on the specific chromosomes involved in pericentric inversions.
    • Informs genetic counseling regarding the risks associated with different types of chromosomal rearrangements.
    • Highlights the importance of considering "position effect" and other mechanisms in assessing genetic risks.