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A chromosomal abnormality, specifically an interstitial deletion on chromosome 7 (7q22::7q31), was identified in a girl with developmental delays. This genetic finding correlated with specific physical and immunological markers, including high immunoglobulin G levels.
Area of Science:
- Genetics
- Clinical Medicine
- Immunology
Background:
- Chromosome studies are crucial for diagnosing genetic disorders.
- Developmental delays and physical anomalies often indicate underlying chromosomal abnormalities.
- Understanding chromosomal aberrations aids in disease diagnosis and management.
Observation:
- A 25-month-old girl presented with psychomotor retardation and dysphagia.
- Physical examination revealed short distal ulnar phalanges, clitoral hypertrophy, and thin ear cartilages.
- Laboratory tests showed elevated immunoglobulin G (IgG) and follicle-stimulating hormone (FSH) levels.
Findings:
- Cytogenetic analysis identified an interstitial deletion on the long arm of chromosome 7 (7q22::7q31).
- The deleted segment of chromosome 7 did not contain identifiable gene loci.
- Elevated IgG and serum FSH levels were noted in conjunction with the chromosomal deletion.
Implications:
- This case highlights the potential association between chromosome 7q deletions and specific phenotypic features.
- The immunological findings (elevated IgG) may represent a novel consequence of this chromosomal abnormality.
- Further research is warranted to elucidate the function of genes within the deleted region and their role in development and immunity.
Abstract:
Chromosome studies were carried out in a girl because of psychomotor retardation and difficulty in swallowing. The girl was admitted to hospital for the first time when 25 months old. The most characteristic signs revealed by the physical examination were short distal ulnar phalanges, clitoral hypertrophy, and very thin outer ear cartilages. An interstitial deletion of the long arm of chromosome 7 was observed: 7q22::7q31. Laboratory investigations revealed a remarkably high levels of IgG, immunoglobulin, and an elevated value of serum FSH. No evidence of gene loci located at the deleted part of chromosome 7 were found.