Identifying rare genetic variants in 21 highly multiplex autism families: the role of diagnosis and autistic traits.

Scientists studied the DNA of 21 families where at least three members have autism. They looked at both autism diagnoses and autism-like traits to find rare genetic changes linked to autism. They found slightly more autism-related genetic variants in people with autism diagnoses. The genes they identified are involved in brain development, suggesting these genetic changes may affect how the brain grows and develops.

This study examined genetic variants in 21 families with multiple autistic members using whole-genome sequencing. Researchers analyzed both clinical autism diagnoses and autistic traits to identify rare genetic variants associated with autism and related neurodevelopmental conditions. The study found a modest increase in autism-associated variants among diagnosed autistic individuals compared to those without autism diagnoses. Identified genes converged on molecular pathways related to brain development and neurogenesis.

The research demonstrates potential value in combining clinical diagnosis with trait-based approaches for genetic prioritization in autism research.

Findings support genetic testing approaches that consider both clinical diagnosis and autistic traits. Results may inform genetic counseling for multiplex autism families and contribute to understanding of developmental pathways involved in autism.

Small sample size of 21 families limits generalizability. Study design and methodology not clearly described in abstract. Magnitude of genetic variant excess described as 'modest', suggesting limited effect sizes.

Autism is a highly heritable, heterogeneous, neurodevelopmental condition. Large-scale genetic studies, predominantly focussing on simplex families and clinical diagnoses of autism have identified hundreds of genes associated with autism. Yet, the contribution of these classes of genes to multiplex families and autistic traits still warrants investigation. Here, we conducted whole-genome sequencing of 21 highly multiplex autism families, with at least three autistic individuals in each family, to prioritise genes associated with autism.

Using a combination of both autistic traits and clinical diagnosis of autism, we identify rare variants in genes associated with autism, and related neurodevelopmental conditions in multiple families. We identify a modest excess of these variants in autistic individuals compared to individuals without an autism diagnosis. Finally, we identify a convergence of the genes identified in molecular pathways related to development and neurogenesis. In sum, our analysis provides initial evidence to demonstrate the value of integrating autism diagnosis and autistic traits to prioritise genes.