Related Experiment Videos
Summary
Pentasomy X, a rare genetic condition with a 49,XXXXX karyotype, was identified in a 12-month-old girl with psychomotor retardation. This case highlights key clinical features associated with this X chromosome polysomy syndrome.
Area of Science:
- Human Genetics
- Cytogenetics
- Developmental Biology
Background:
- Psychomotor retardation in children necessitates comprehensive etiological investigations, including cytogenetic analysis.
- X chromosome polysomy syndromes are rare genetic disorders characterized by intellectual disability and distinctive physical features.
Observation:
- A 12-month-old female infant presented with severe psychomotor retardation.
- Cytogenetic analysis revealed a 49,XXXXX karyotype, confirming pentasomy X.
- Clinical examination noted low birth weight, oligophrenia, craniofacial abnormalities (hypertelorism, epicanthus), and digital deformities.
Findings:
- The patient exhibited a significantly diminished total ridge count (TRC) of 15.
- Comparison with existing literature revealed consistent features such as low birth weight and craniofacial anomalies.
- Less common findings, including cardiac malformations and facial hemiatrophy, were also observed.
Implications:
- This case expands the phenotypic description of pentasomy X, particularly regarding dermatoglyphic patterns and hemiatrophy.
- Early cytogenetic diagnosis is crucial for understanding developmental trajectories and providing appropriate supportive care.
- Further research into X chromosome polysomy syndromes can elucidate genotype-phenotype correlations and inform genetic counseling.