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Mosaicism for ring and isopseudodicentric chromosome 13
Clinical Genetics
|January 1, 1986
Summary
This study details a rare case of chromosome 13 mosaicism in an infant, specifically an isopseudodicentric/ring formation. This genetic anomaly explains the infant's multiple malformations due to chromosome 13 duplication-deficiency.
Area of Science:
- Cytogenetics
- Human Genetics
- Developmental Biology
Background:
- Routine cytogenetic evaluation is crucial for diagnosing genetic disorders in infants.
- Chromosome 13 abnormalities can lead to severe developmental issues and multiple malformations.
Observation:
- A three-month-old female infant presented with multiple congenital malformations.
- Initial cytogenetic analysis revealed mosaicism involving chromosome 13, specifically a dicentric/ring structure.
Findings:
- Further investigation identified the dicentric chromosome as an isopseudodicentric.
- The formation mechanism involves chromosome and chromatid breaks, bridging, breaking, and fusion, distinct from typical ring chromosome 13 formation.
- The infant's phenotype is consistent with a combined duplication-deficiency of chromosome 13.
Implications:
- This case highlights a rare mechanism of chromosome rearrangement in humans.
- Understanding isopseudodicentric/ring formation is vital for accurate genetic diagnosis and counseling.
- Phenotypic correlation in chromosomal mosaicism underscores the importance of detailed cytogenetic analysis.