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X-linked genes and mental functioning.

David H Skuse1

  • 1Behavioural and Brain Sciences Unit, Institute of Child Health, London, UK. dskuse@ich.ucl.ac.uk

Human Molecular Genetics
|April 6, 2005
PubMed
Summary

The X-chromosome influences intelligence and social-emotional regulation through its genes. Differences in X-linked gene expression between sexes impact brain development and function.

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Area of Science:

  • Genetics
  • Neuroscience
  • Evolutionary Biology

Background:

  • The X-chromosome has evolved over 300 million years, accumulating genes related to mental functions.
  • Evidence suggests X-linked genes influence general intelligence and specific cognitive/emotional traits.

Purpose of the Study:

  • To explore the mechanisms by which X-linked genes influence sexually dimorphic brain processes.
  • To investigate the role of X-linked gene dosage and imprinting in neural differentiation and function.

Main Methods:

  • Review of studies on human and mouse models, including X-monosomic individuals (45,X and 39,X).
  • Analysis of X-linked gene expression patterns, including those escaping X-inactivation.
  • Examination of X-linked imprinted genes' effects on brain structure and function.

Main Results:

  • X-linked genes show a general influence on intelligence and specific effects on social cognition and emotional regulation.
  • Differential expression of some X-linked genes in male and female brains observed in mice.
  • Escape from X-inactivation in many human X-linked genes suggests dosage differences are crucial for neural differentiation.
  • Studies of X-monosomic individuals reveal specific influences of X-linked imprinted genes on brain development.

Conclusions:

  • X-linked genes play a significant role in brain development and function, influencing intelligence and behavior.
  • Dosage effects of X-linked genes escaping X-inactivation and imprinted genes contribute to sex differences in the brain.
  • Further research is needed to identify specific candidate genes responsible for these observed effects.

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