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Autism traits in the RASopathies.

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RASopathies, a group of genetic disorders, show increased autism traits, suggesting Ras/MAPK pathway dysregulation may contribute to autism spectrum disorder (ASD) risk.

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Area of Science:

  • Genetics
  • Neurodevelopmental Disorders
  • Psychiatry

Background:

  • Ras/mitogen-activated protein kinase (Ras/MAPK) pathway mutations cause RASopathies (e.g., NF1, NS, CS, CFC).
  • Potential overlap exists between Ras/MAPK dysregulation and autism spectrum disorders (ASD).
  • Previous research on NF1 and autism is conflicting; no systematic evaluation of autism traits across RASopathies exists.

Purpose of the Study:

  • To systematically evaluate autism traits in RASopathies as a class.
  • To investigate the role of germline Ras/MAPK activation in ASD.

Main Methods:

  • Examined autism traits in NF1, NS, CS, and CFC probands.
  • Compared affected individuals with unaffected sibling controls and idiopathic ASD subjects.
  • Utilized the Social Communication Questionnaire (SCQ) and Social Responsiveness Scale (SRS).

Main Results:

  • All four RASopathies demonstrated increased qualitative and quantitative autism traits versus sibling controls.
  • Distinct patterns of social impairment were observed in each RASopathy.
  • Autism-like impairment showed a male bias, mirroring idiopathic ASDs.

Conclusions:

  • Elevated autism traits in RASopathies suggest Ras/MAPK pathway dysregulation may increase ASD risk.
  • Sex bias and sibling correlation indicate shared characteristics between RASopathy-associated and general/clinical ASD traits.
  • This study offers insights into the mechanisms underlying idiopathic ASDs.