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Related Experiment Videos

Gene expression changes in children with autism.

Jeffrey P Gregg1, Lisa Lit, Colin A Baron

  • 1Department of Pathology, University of California at Davis Medical Center, Sacramento, CA 95817, USA. University of California at Davis, Davis, CA 95616, USA. jpgregg@ucdavis.edu

Genomics
|November 17, 2007
PubMed
Summary
This summary is machine-generated.

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Gene expression differences in blood leukocytes were identified in children with autism spectrum disorder (ASD) compared to controls. These findings suggest potential genetic or environmental predispositions to autism.

Area of Science:

  • Genetics
  • Immunology
  • Neurodevelopmental Disorders

Background:

  • Autism Spectrum Disorder (ASD) is a complex neurodevelopmental condition with a growing need to understand its underlying biological mechanisms.
  • Gene expression studies in peripheral blood offer a potential window into the systemic biological alterations associated with ASD.

Purpose of the Study:

  • To identify distinct gene expression profiles in children with autism (AU) and ASD compared to typically developing children from the general population (GP).
  • To investigate gene expression differences within autism subgroups: early onset (A-E) and autism with regression (A-R).

Main Methods:

  • Transcriptional profiling of total RNA from blood samples using human Affymetrix microarrays.
  • Comparison of gene expression between 35 children with AU (subdivided into A-E and A-R) and 14 children with ASD against 12 GP children.

Related Experiment Videos

  • Statistical analysis using unpaired t-tests with false discovery rate correction and quantitative real-time PCR (qRT-PCR) for validation.

    • Main Results:

    • Significant gene expression differences were found between AU and GP (55 genes), A-E and GP (140 genes), and A-R and GP (20 genes).
    • A substantial number of genes (494) showed differential expression between the A-R and A-E subgroups.
    • Eleven shared genes, primarily expressed in natural killer cells and linked to natural killer cytotoxicity pathways, were identified across autism subgroups compared to GP. These were validated by qRT-PCR.

    Conclusions:

    • Gene expression data indicate abnormalities in peripheral blood leukocytes in children with autism.
    • These findings support the hypothesis of a genetic and/or environmental predisposition contributing to the development of autism spectrum disorder.
    • Natural killer cell-related gene expression may play a role in the pathophysiology of autism.