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Related Experiment Videos

13q-/r(13) mosaicism

T Tamura, M Umetsu, H Motoya

    European Journal of Pediatrics
    |March 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    This study reports a rare mosaic chromosomal abnormality in a 2-month-old infant with 13q- syndrome. The infant presented with persistent low serum sodium and chloride levels, potentially linked to brain abnormalities.

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    Area of Science:

    • Human Genetics
    • Clinical Cytogenetics
    • Pediatric Endocrinology

    Background:

    • 13q- syndrome is a rare chromosomal disorder characterized by a deletion on the long arm of chromosome 13.
    • Mosaicism, where an individual has cell populations with different genetic makeup, can complicate diagnosis and prognosis.
    • Electrolyte imbalances, such as low serum sodium (hyponatremia) and chloride (hypochloremia), can occur in infants and may indicate underlying genetic or developmental issues.

    Observation:

    • A 2-month-old female infant presented with typical clinical features suggestive of 13q- syndrome.
    • Genetic analysis revealed an unreported mosaic chromosomal abnormality: 46,XX,del(13)(q22) alongside 46,XX,r(13)(p13q22).
    • The infant exhibited persistent difficulties in maintaining normal serum sodium and chloride levels from the second day of life.

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    Findings:

    • The identified mosaicism involving deletion and a ring chromosome 13 is a novel genetic finding.
    • The persistent hyponatremia and hypochloremia in the infant suggest a potential link to the chromosomal abnormality.
    • Cerebral dysgenesis is hypothesized as a possible cause for the observed electrolyte disturbances.

    Implications:

    • This case highlights the importance of detailed cytogenetic analysis in infants with complex presentations of 13q- syndrome.
    • Understanding the genotype-phenotype correlation in mosaic chromosomal abnormalities is crucial for accurate diagnosis and management.
    • Further investigation into the relationship between this specific mosaicism, cerebral dysgenesis, and electrolyte imbalance is warranted.