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Partial trisomy of chromosome 14: (+14q-)
Birth Defects Original Article Series
|January 1, 1976
Summary
Partial trisomy 14, a karyotype with an extra 14q- chromosome, is compatible with life. This genetic condition presents with nonspecific clinical features, primarily growth and intellectual disability, broadening the scope for chromosome analysis.
Area of Science:
- Cytogenetics
- Human Genetics
- Molecular Biology
Background:
- Partial trisomy 14 (47, +14q-) is a cytogenetic abnormality compatible with life.
- Clinical manifestations are nonspecific, often presenting as growth and mental retardation.
- The diagnosis relies on cytogenetic analysis rather than distinct clinical features.
Observation:
- The presence of a +14q- karyotype necessitates careful consideration.
- Equally important is the exclusion of disorders with similar features but without chromosomal aberrations, such as those linked to ESA fragments.
- Investigating parental karyotypes for balanced translocations is crucial for genetic counseling.
Findings:
- The proximal long arm of chromosome 14 exhibits relative fragility at two sites: 14q12 (in vitro) and 14q22 (in vivo).
- Blood group analyses have not proven informative in diagnosing or characterizing this condition.
- The study highlights the importance of cytogenetic analysis for identifying partial trisomy 14.
Implications:
- This finding broadens the indications for chromosome analysis in pediatric cases with developmental delays.
- Understanding chromosome 14 fragility sites can aid in diagnosing complex genetic disorders.
- Accurate cytogenetic diagnosis is essential for appropriate genetic counseling and family planning.