Customized Chromosomal Microarrays for Neurodevelopmental Disorders

Area of Science:

• Genetics
• Neuroscience
• Bioinformatics

Background:

• Neurodevelopmental disorders (NDDs), including autism spectrum disorder (ASD), are genetically complex.
• Structural genomic variations like copy number variants (CNVs) are implicated in NDDs.
• Current diagnostic methods struggle to interpret the clinical significance of these variants.

Purpose of the Study:

• To enhance diagnostic yield for NDDs using a custom gene-oriented chromosomal microarray (CMA).
• To prioritize candidate genes for NDDs through systems biology approaches.
• To identify novel genetic factors contributing to neurodevelopmental pathologies.

Main Methods:

• Developed a custom CMA targeting 6026 neurodevelopment genes.
• Analyzed 39 patients with unexplained developmental delay, intellectual disability, or ASD.
• Employed systems biology, including network analysis and functional module identification.

Main Results:

• Identified pathogenic or likely pathogenic CNVs in 31% of cases.
• Network analysis highlighted key candidate genes (e.g., NPEPPS, PSMG1, DOCK8, SLC15A4).
• Discovered novel CNV regions linked to neurodevelopmental phenotypes, with enriched glial and astrocytic network involvement.

Conclusions:

• Custom CMA improves detection and prioritization of clinically relevant CNVs in NDDs.
• Biological network integration aids in identifying novel candidate genes.
• The study underscores the role of glial and immune pathways in neurodevelopmental disorders and identifies new research targets.