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Variants of chromosome 9 in phenotypically normal individuals
K F Cheong1, L A Knight, M Tan
1Department of Pathology, Singapore General Hospital, Singapore.
Annals of the Academy of Medicine, Singapore
|May 1, 1997
Summary
Human chromosome 9 shows significant structural variability, including inversions and duplications. Identifying inheritance from normal individuals is key to distinguishing variant from abnormal chromosomes.
Area of Science:
- Human Genetics
- Cytogenetics
- Molecular Biology
Background:
- Human chromosome 9 exhibits exceptional structural variability.
- Four primary variant types are identified: pericentric inversion, extra G-positive bands (p and q arms), and duplication of 9q21-q22.
Purpose of the Study:
- To detail the structural variants of human chromosome 9.
- To emphasize the importance of distinguishing variant chromosomes from abnormal ones.
Main Methods:
- Review of cytogenetic data on chromosome 9 variants.
- Analysis of banding patterns (G-positive bands).
- Comparative analysis of variant and abnormal chromosome structures.
Main Results:
- Chromosome 9 variants include pericentric inversions, extra G-positive bands on both p and q arms, and duplication of the 9q21-q22 region.
- These variants represent significant structural diversity within the human genome.
Conclusions:
- Demonstrating inheritance from phenotypically normal individuals is crucial.
- This differentiation is essential for accurate genetic diagnosis and counseling.