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Updated: Aug 14, 2026
05:51
A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
Published on: June 15, 2011
Genetic Heterogeneity in Autism Spectrum Disorder: Diagnostic Yield, Recurrent Genes, and Rare Variant-Phenotype
Zainab Gaouzi1,2,3, Giulia Spoto4, Francesca Polito3
1Mohammed VI University of Sciences and Health (UM6SS), Casablanca 82403, Morocco.
International Journal of Molecular Sciences
|August 13, 2026
Summary
Whole-exome sequencing identified pathogenic variants in 36% of children with autism spectrum disorder (ASD), revealing recurrent genes and phenotype-specific associations. This genetic analysis offers actionable diagnoses and insights into ASD
Area of Science:
- Genetics and Genomics
- Neurodevelopmental Disorders
- Bioinformatics
Background:
- Autism spectrum disorder (ASD) exhibits significant genetic heterogeneity, involving both rare and common genetic variants.
- These variants disrupt critical neurodevelopmental pathways, contributing to the complex etiology of ASD.
- Understanding the genetic underpinnings is crucial for accurate diagnosis and targeted interventions.
Purpose of the Study:
- To investigate the genetic architecture of autism spectrum disorder (ASD) using whole-exome sequencing (WES).
- To identify pathogenic variants and recurrent genes associated with ASD phenotypes.
- To explore genotype-phenotype relationships and uncover potential convergent genetic pathways.
Main Methods:
- Whole-exome sequencing (WES) was performed on a cohort of children diagnosed with ASD.
- Clinical phenotypes were systematically recorded, and variant interpretation followed ACMG guidelines.
- Recurrence analysis, cohort enrichment testing (gnomAD), and SKAT/SKAT-O were employed to analyze genotype-phenotype correlations across 16 phenotypes.
Main Results:
- Pathogenic or likely pathogenic variants were identified in 9 out of 25 individuals (36% diagnostic yield), implicating genes in neurodevelopmental, epileptic, metabolic, and syndromic disorders.
- Recurrence analysis revealed 586 genes present in at least two individuals, with PABPC1, GTF2I, PCLO, PKD1, and EP400 being most frequent.
- SKAT/SKAT-O identified significant genotype-phenotype associations for motor delay, aggressive behavior, mutism, anxiety, unresponsiveness to spoken voice, digestive disorder, and sleep disturbances, with some phenotype-specific gene signals.
Conclusions:
- This integrative WES study provides clinically actionable genetic diagnoses for a substantial proportion of individuals with ASD.
- The findings highlight recurrently mutated genes and uncover phenotype-specific genetic associations, suggesting convergent neurodevelopmental pathways with underlying gene-level heterogeneity.
- The study underscores the utility of WES in unraveling the genetic complexity of ASD and informing personalized medicine approaches.
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