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Related Experiment Videos

Phenotypic variability in the chromosome 9 ring.

M L Cavaliere1, M M Rinaldi, P Castelluccio

  • 1Service of Medical Genetics, Hospital A. Cardarelli, Naples, Italy.

Acta Bio-Medica De L'Ateneo Parmense : Organo Della Societa Di Medicina E Scienze Naturali Di Parma
|January 1, 1997
PubMed
Summary
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Ring chromosome 9 syndrome is rare, marked by microcephaly, psychomotor retardation, and facial differences similar to 9p monosomy. Deletion size influences symptom severity.

Area of Science:

  • Genetics
  • Clinical Medicine
  • Developmental Biology

Background:

  • Ring chromosome 9 syndrome is a rare chromosomal disorder.
  • It is characterized by a specific set of clinical features.

Observation:

  • The syndrome was first described by Kistenmacher in 1970.
  • Subsequent observations have detailed constant signs including microcephaly, psychomotor retardation, and facial dysmorphism.

Findings:

  • The observed facial dysmorphism is consistent with that seen in 9p monosomy.
  • Clinical variability, particularly in psychomotor retardation, correlates with the extent of the telomeric deletion.

Implications:

  • Understanding the relationship between deletion size and phenotype is crucial for accurate diagnosis and prognosis.

Related Experiment Videos

  • Further research into ring chromosome syndromes can improve genetic counseling and patient management.