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Free trisomy 9P in elderly woman
Annales De Genetique
|March 1, 1977
Summary
A rare genetic condition, trisomy 9p, was identified in a woman with intellectual disability and developmental abnormalities. This case highlights the impact of extra chromosome material on complex human development.
Area of Science:
- Human Genetics
- Clinical Cytogenetics
- Developmental Biology
Background:
- Trisomy 9p, a rare chromosomal abnormality, results from an extra copy of the short arm of chromosome 9.
- This condition is associated with a spectrum of developmental and intellectual disabilities.
Observation:
- A 50-year-old woman presented with intellectual disability, dysmorphic facial features, severe cerebral malformations, limb deformities, and delayed sexual maturation.
- Karyotype analysis revealed an extra chromosome, identified as 47,XX,+9p, with banding revealing the extra material comprised 9p and proximal 9q.
Findings:
- The extra chromosome fragment was characterized by a large secondary constriction, with the estimated breakage point at 9q13.
- Homozygous large C bands were noted on both normal chromosome 9s and the extra chromosome, suggesting potential genetic implications.
- The clinical presentation was consistent with a pure trisomy 9p syndrome.
Implications:
- This case suggests that malsegregation of a deleted chromosome 9 may be a mechanism leading to trisomy 9p.
- Understanding the genetic basis of trisomy 9p is crucial for genetic counseling and potential therapeutic strategies.
- Further research into the specific breakpoints and C-band variations can refine genotype-phenotype correlations in trisomy 9p.