A fourth case of ring chromosome 7

Area of Science:

• Genetics
• Human Biology

Background:

• Ring chromosomes are rare chromosomal abnormalities.
• Ring chromosome 7 (r(7)) is exceptionally uncommon, with few cases reported.
• Understanding the phenotypic spectrum of r(7) is crucial for genetic counseling.

Observation:

• A case of an 8-year-old female with r(7) is described, representing the fourth reported individual and the first female.
• The proband presented with short stature, minor skeletal anomalies, and normal intelligence.
• A striking feature was the presence of multiple large, pigmented nevi, unlike those seen in typical syndromes.

Findings:

• This patient is the first with a chromosome 7 anomaly to exhibit such extensive nevi.
• Comparison with other r(7) cases reveals significant phenotypic variability.
• The clinical presentation is also compared with various 7p and 7q deletion syndromes.

Implications:

• The findings expand the known phenotypic spectrum associated with ring chromosome 7.
• This case underscores the importance of detailed cytogenetic analysis in individuals with congenital anomalies.
• Further research into ring chromosome formation and behavior is needed to understand their variable phenotypic expression.