Related Experiment Videos
Complex chromosomal rearrangement leading to partial trisomy 22
Journal of Medical Genetics
|February 1, 1980
Summary
A boy with unique facial features and intellectual disability was found to have a trisomy 22 condition due to extra genetic material. His parents and siblings had normal chromosomes, indicating a de novo genetic event.
Area of Science:
- Genetics
- Cytogenetics
- Human Biology
Background:
- Genetic disorders can manifest with distinctive physical and cognitive symptoms.
- Cytogenetic analysis is crucial for diagnosing chromosomal abnormalities.
Observation:
- A male patient presented with unusual facial characteristics and significant mental retardation.
- Initial cytogenetic studies revealed an abnormal karyotype: 47,XY, with two additional marker chromosomes (M1 and M2).
Findings:
- The patient's karyotype was interpreted as a functionally partial trisomy 22.
- Analysis of parental and sibling chromosomes confirmed they were normal, suggesting a new genetic mutation.
Implications:
- This case highlights the phenotypic variability associated with partial trisomy 22.
- Understanding such chromosomal anomalies is vital for genetic counseling and diagnosis of developmental disorders.