Ring chromosome 2: clinical, chromosomal, and biochemical aspects

Area of Science:

• Genetics
• Human Biology
• Molecular Biology

Background:

• Ring chromosome 2 is a rare chromosomal abnormality.
• Previous cases of ring chromosome 2 have shown variable clinical presentations.

Observation:

• A novel case of ring chromosome 2 was identified.
• The patient exhibited severe pre- and postnatal growth failure, microcephaly, psychomotor retardation, and minor dysmorphic features.

Findings:

• Cytogenetic analysis confirmed a ring chromosome 2 structure with aneuploidy.
• High-resolution banding did not reveal significant chromosomal material loss.
• Enzymatic studies indicated reduced red cell acid phosphatase activity.

Implications:

• The findings suggest a potential gene dosage effect for acid phosphatase.
• This case contributes to understanding the phenotype associated with ring chromosome 2.
• The study refines the chromosomal localization of the acid phosphatase gene to the 2p25-2pter region.