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Mosaicism and the trisomy 8 syndrome
Clinical Genetics
|August 1, 1978
Summary
Trisomy 8 mosaicism presents variably, with atypical cases challenging diagnosis. Mosaicism levels differ between tissues and over time, impacting clinical presentation.
Area of Science:
- Genetics
- Developmental Biology
- Clinical Genetics
Background:
- Trisomy 8 mosaicism is a rare chromosomal abnormality.
- Characterized by the presence of an extra copy of chromosome 8 in some cells.
- Often associated with a range of developmental abnormalities.
Observation:
- Presents three new cases of trisomy 8 mosaicism.
- Two cases exhibited typical features, while one was highly atypical.
- Mosaicism was almost universal across the presented cases.
Findings:
- Little correlation exists between the degree of mosaicism and the extent of clinical abnormality.
- Mosaicism levels vary significantly between different tissues (e.g., fibroblasts vs. lymphocytes).
- Evidence suggests mosaicism levels can change over time.
Implications:
- Fibroblast analysis is more informative for detecting aneuploidy than lymphocyte analysis.
- Atypical presentations necessitate careful diagnostic evaluation.
- Further research into the causes, including potential links to advanced paternal age, is warranted.