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Monosomy 21 in hematologic diseases.
Daniel L Van Dyke1, Anne Wiktor
1Department of Medical Genetics, Henry Ford Health System, 2799 West Grand Boulevard, Clara Ford Pavillion, Detroit, MI 48202, USA.
Cancer Genetics and Cytogenetics
|April 18, 2003
Summary
Monosomy 21 mosaicism is rare and often an artifact. Further testing, like fluorescence in situ hybridization (FISH), is crucial for confirming true cases and their potential links to leukemia.
Area of Science:
- Cytogenetics
- Human Genetics
- Cancer Genetics
Background:
- Monosomy 21 mosaicism, a rare chromosomal abnormality, is infrequently reported as an isolated finding.
- Previous literature describes limited confirmed cases, necessitating rigorous diagnostic approaches.
Observation:
- Five cases of low-level monosomy 21 mosaicism were identified since 1998.
- These cases, along with many prior reports, lacked confirmation via fluorescence in situ hybridization (FISH) or follow-up cytogenetics.
- The observed instances may represent artifacts from cell culture or slide preparation.
Findings:
- The study questions the validity of many reported monosomy 21 mosaicism cases due to lack of confirmation.
- Confirmed cases of monosomy 21 mosaicism suggest a potential, though rare, association with acute myelocytic leukemia and chronic lymphocytic leukemia.
Implications:
- Future suspected cases of monosomy 21 mosaicism require robust confirmation using advanced techniques.
- Accurate diagnosis is vital for understanding the true incidence and clinical significance of this chromosomal abnormality.
- Further research is needed to elucidate the potential oncogenic role of confirmed monosomy 21 mosaicism.