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Ring chromosome 15:r(15). Identification by R banding
Humangenetik
|January 1, 1975
Summary
A ring chromosome 15 (r(15)) was identified in a girl with intellectual disability. This rare genetic condition, r(15) syndrome, typically shows minimal physical features but is associated with reduced height.
Area of Science:
- Genetics
- Clinical Medicine
- Human Biology
Background:
- Intellectual disability can stem from various genetic causes.
- Chromosomal abnormalities are a significant factor in developmental disorders.
- Ring chromosome D, specifically r(15), is a rare cytogenetic finding.
Purpose of the Study:
- To investigate the genetic basis of intellectual disability in a non-dysmorphic child.
- To identify and characterize a specific chromosomal abnormality.
- To understand the phenotypic impact of ring chromosome 15.
Main Methods:
- Clinical examination of a child with unexplained intellectual disability.
- Cytogenetic analysis, including thermic moderate denaturation, to identify chromosomal aberrations.
- Karyotyping to confirm the presence of a ring chromosome.
Main Results:
- A ring chromosome D was detected in the patient.
- Thermic moderate denaturation confirmed the ring chromosome as r(15).
- The patient exhibited intellectual disability without significant dysmorphic features.
Conclusions:
- Ring chromosome 15 (r(15)) syndrome is a rare condition.
- r(15) syndrome has a limited effect on overall phenotype.
- Reduced height is a consistent feature associated with r(15) syndrome.