Brain-Enriched Coding and Long Non-coding RNA Genes Are Overrepresented in Recurrent Neurodevelopmental Disorder CNVs

Area of Science:

• Genetics
• Neurodevelopmental Disorders
• Bioinformatics

Background:

• Autism spectrum disorder (ASD) is a complex neurodevelopmental condition with significant genetic heterogeneity.
• Copy number variations (CNVs) are implicated in 10%-20% of ASD cases, but causative genes are often unclarified.

Purpose of the Study:

• To develop and validate SNATCNV, a novel computational tool for identifying recurrent autism spectrum disorder (ASD) copy number variation (CNV) regions.
• To analyze the gene content of identified ASD CNV regions for brain-enriched expression patterns and potential functional significance.

Main Methods:

• Utilized the AutDB database comprising 19,663 ASD cases and 6,479 controls.
• Developed and applied SNATCNV, a new tool for recurrent CNV region identification, comparing its performance to existing methods.
• Performed gene content analysis using FANTOM5 to assess expression patterns of coding genes and long non-coding RNAs (lncRNAs) within identified CNV regions.

Main Results:

• Identified 47 recurrent ASD CNV regions using SNATCNV, demonstrating superior performance compared to existing tools.
• Observed brain-enriched expression patterns for coding genes and lncRNAs within ASD CNV regions identified by SNATCNV, a feature not seen with other tools.
• Detected evidence of sexual dimorphism in CNV loci, identified a unique locus with a single lncRNA gene, and correlated CNVs with distinct clinical and behavioral traits.

Conclusions:

• SNATCNV is an effective tool for defining genomic loci and causative genes in ASD and other CNV-associated conditions.
• The identified ASD CNV regions harbor brain-enriched genes, suggesting a role in neurodevelopmental pathways.
• Further research into these specific CNV regions and their associated genes may elucidate etiological mechanisms in ASD and inform therapeutic strategies.