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Related Experiment Videos

Autism and the X chromosome. Multipoint sib-pair analysis

J Hallmayer1, J M Hebert, D Spiker

  • 1Department of Psychiatry and Behavioral Sciences, Nancy Pritzker Laboratory of Developmental and Molecular Neurobiology, Stanford University, Calif, USA.

Archives of General Psychiatry
|November 1, 1996
PubMed
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Genetic factors contribute to autism, but inheritance is unclear. This study found no strong evidence for X-linked genes causing autism, though smaller effects remain possible.

Area of Science:

  • Genetics
  • Neurodevelopmental Disorders
  • Human Genetics

Background:

  • Genetic factors are significant in autism etiology.
  • The inheritance pattern of autism remains largely unknown.
  • Higher autism incidence in males suggests potential X chromosome involvement.

Purpose of the Study:

  • To investigate the role of X-linked genes in autism inheritance.
  • To identify specific regions on the X chromosome linked to autism.

Main Methods:

  • Utilized data from 38 multiplex autism families.
  • Conducted multipoint sib-pair linkage analysis on the X chromosome.
  • Assessed linkage using risk ratio (lambda xs) parameter and exclusion mapping.

Main Results:

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  • The entire X chromosome was excluded for a risk ratio (lambda xs) of 4.
  • Exclusion ability decreased with smaller lambda xs values.
  • A maximum lod score of 1.24 was observed at locus DXS424 for lambda xs = 1.5.

Conclusions:

  • Moderate to strong gene effects on the X chromosome causing autism were excluded.
  • Smaller gene effects (lambda xs < 4) could not be ruled out.
  • A potential small-effect gene between DXS453 and DXS1001 was not excluded.