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Related Experiment Videos

Bisatellited microchromosomes and multiple congenital malformations.

J Chemke, S Rappaport, R Nisani

    Acta Paediatrica Scandinavica
    |May 1, 1983
    PubMed
    Summary

    The role of extra small metacentric chromosomes remains unclear. A case study highlights a patient with congenital malformations and an additional bisatellited chromosome, linked to maternal chromosomal changes, posing genetic counseling challenges.

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    Area of Science:

    • Human Genetics
    • Cytogenetics
    • Medical Genetics

    Background:

    • The clinical significance of supernumerary small metacentric chromosomes is not well-defined.
    • Extra small bisatellited chromosomes can be associated with phenotypic abnormalities.
    • Parental chromosomal rearrangements, even minor ones, can increase the risk of aneuploidy or instability in offspring.

    Observation:

    • A patient presented with multiple congenital malformations affecting craniofacial structures, cardiovascular system, and gastrointestinal tract.
    • Genetic analysis revealed an extra small bisatellited chromosome in the affected individual.
    • The mother's karyotype showed a marker chromosome 9.

    Findings:

    • The presence of an additional small bisatellited chromosome may be associated with a spectrum of congenital malformations.

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  • Maternal chromosomal abnormalities, such as marker chromosomes, can be linked to the occurrence of extra chromosomes in offspring.
  • Chromosomal instability can arise in families with parental minor structural chromosomal changes.

    • Implications:

    • These findings present a diagnostic challenge for genetic counseling, particularly regarding recurrence risk assessment.
    • Understanding the role of small supernumerary marker chromosomes is crucial for accurate genetic diagnosis and patient management.
    • Further research is needed to elucidate the mechanisms and clinical consequences of small additional metacentric chromosomes.