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Related Experiment Videos

Ring-X chromosomes: their cognitive and behavioural phenotype.

J Kuntsi1, D Skuse, K Elgar

  • 1Behavioural Sciences Unit, Institute of Child Health, University College London, UK. jkuntsi@ich.ucl.ac.uk

Annals of Human Genetics
|June 21, 2001
PubMed
Summary

Ring X chromosome (r(X)) is linked to learning difficulties and behavioral issues. Impairment severity correlates with the r(X) chromosome

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Area of Science:

  • Genetics
  • Neuroscience
  • Developmental Biology

Background:

  • Ring X chromosome (r(X)) is a rare chromosomal abnormality.
  • X chromosome inactivation (XCI) is crucial for dosage compensation.
  • The impact of r(X) on cognitive function and XCI is not fully understood.

Purpose of the Study:

  • To assess cognitive abilities and educational achievements in patients with r(X).
  • To correlate these variables with XCI failure and mosaicism in r(X) patients.
  • To compare r(X) patients with 45,X Turner syndrome.

Main Methods:

  • Cognitive and educational assessments were performed on 47 patients with r(X).
  • X inactivation patterns were analyzed in peripheral blood cells.
  • Correlations between r(X) characteristics, XCI status, and cognitive/behavioral outcomes were examined.

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Main Results:

  • r(X) possession is associated with increased risk of learning difficulties and behavioral maladjustment compared to 45,X Turner females.
  • A negative correlation exists between the proportion of inactivated r(X) cells and nonverbal IQ.
  • Impairment severity is linked to the size of the active ring, suggesting gene dosage effects on brain development.

Conclusions:

  • Ring X chromosome is associated with significant cognitive and behavioral challenges.
  • X inactivation patterns and the size of the active ring are key determinants of phenotype severity.
  • Further research is needed to identify specific genes affected by functional disomy on the ring X chromosome.