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Related Experiment Videos

Five new subjects with ring chromosome 22.

H A Ishmael1, D Cataldi, M L Begleiter

  • 1The Children's Mercy Hospitals and Clinics and University of Missouri-Kansas City School of Medicine, Kansas City, MO, USA.

Clinical Genetics
|May 20, 2003
PubMed
Summary

Ring chromosome 22 syndrome is a rare genetic disorder with variable symptoms. This study details five new cases and reviews existing literature, highlighting common features like intellectual disability and motor delays.

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Area of Science:

  • Genetics
  • Cytogenetics
  • Human Genetics

Background:

  • Ring chromosome 22 (r(22)) is a rare cytogenetic abnormality.
  • Approximately 50 cases have been reported since its initial description in 1968.

Purpose of the Study:

  • To describe five new patients with ring chromosome 22 syndrome.
  • To summarize and analyze clinical findings from existing literature.
  • To discuss the role of the ring chromosome and its impact on clinical outcomes.

Main Methods:

  • Case study of five unreported subjects with r(22).
  • Literature review and synthesis of reported clinical findings.
  • Analysis of potential genetic mechanisms contributing to phenotypic variability.

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Main Results:

  • The five new subjects presented with common features: mental retardation, hypotonia, motor delay, speech impairment, full eyebrows, and large ears.
  • Two subjects exhibited central nervous system malformations and regression.
  • Clinical manifestations in r(22) syndrome are highly variable, lacking a consistent physical phenotype.

Conclusions:

  • The variable phenotype in ring chromosome 22 syndrome may result from deletions of specific chromosome 22 sequences near telomeres.
  • Genetic background and unmasked recessive alleles due to deletions can also influence the clinical presentation.
  • Further research is needed to fully elucidate the genotype-phenotype correlations in r(22).