Phenotypic correlations in a patient with ring chromosome 22

Area of Science:

• Genetics
• Clinical Medicine
• Human Cytogenetics

Background:

• Ring chromosome 22 (r(22)) is a rare cytogenetic abnormality.
• Over 60 cases have been documented in medical literature.
• This report presents a novel case and family evaluation.

Observation:

• An 8-year-old female presented with features of r(22).
• Cytogenetic analysis revealed a de novo 46, XX, r(22)(p11.2;q13) karyotype.
• Proband exhibited profound mental retardation, language impairment, dysmorphic features, lack of speech, hyperactivity, and behavioral disorders.

Findings:

• The patient's phenotype included prominent features associated with r(22).
• Observed physical abnormalities showed variability compared to literature.
• This variability is hypothesized to stem from differences in the size of the deleted chromosomal region.

Implications:

• This case contributes to the understanding of ring chromosome 22 phenotypes.
• Highlights the importance of cytogenetic analysis in diagnosing developmental disorders.
• Suggests that deleted region size is a key factor in r(22) manifestation variability.