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inv(5)(p13q13) in a four generation pedigree.
E Vargas-Moyeda1, H Rivera, D Garcia-Cruz
1Unidad de Investigación Biomédica, Instituto Mexicano del Seguro Social, Guadalajara, Jalisco.
Journal De Genetique Humaine
|August 1, 1987
Summary
A young boy presented with right pectoralis major muscle hypoplasia. Genetic analysis revealed a familial chromosome 5 inversion, likely unrelated to the muscle defect, which did not affect fertility across generations.
Area of Science:
- Genetics
- Developmental Biology
- Clinical Medicine
Background:
- Pectoralis major muscle hypoplasia is a rare congenital condition affecting chest wall development.
- Chromosomal inversions can lead to various genetic consequences, including developmental abnormalities.
- Familial chromosomal abnormalities require careful evaluation for inheritance patterns and potential health impacts.
Observation:
- A 4 1/2-year-old male patient exhibited hypoplasia of the right pectoralis major muscle.
- Karyotype analysis identified a specific inversion on chromosome 5: 46,XY,inv(5)(p13q13)mat.
- This pericentric inversion was traced through at least four generations of the patient's maternal lineage.
Findings:
- The identified chromosome 5 inversion (inv(5)(p13q13)mat) was deemed likely independent of the patient's pectoralis major muscle hypoplasia.
- The familial inversion did not appear to compromise reproductive capacity (fertility) in affected individuals.
- No viable recombinant offspring were observed in relation to this specific inversion, suggesting stable inheritance.
Implications:
- This case highlights the importance of distinguishing between congenital malformations and unrelated familial chromosomal variations.
- Understanding the inheritance and effects of chromosomal inversions is crucial for genetic counseling and reproductive planning.
- Further research may elucidate the specific mechanisms, if any, by which this inversion influences genetic stability and recombination in subsequent generations.