Assessment of Brain Morphological Abnormalities and Neurodevelopmental Risk Copy Number Variants in Individuals from...

Area of Science:

• Neuroscience
• Genetics
• Neuroimaging

Background:

• Brain morphological abnormalities are hallmarks of neurodevelopmental disorders (NDDs) and neuropsychiatric disorders.
• The precise etiology of structural brain changes in these conditions, despite shared genetic factors, remains unclear.
• Understanding the genetic underpinnings of neuroanatomy is crucial for deciphering NDDs and related disorders.

Purpose of the Study:

• To investigate the association between copy number variants (CNVs) associated with NDD risk and neuroanatomical alterations.
• To determine if these neuroanatomical changes are present in both individuals with NDDs and neurotypical individuals.
• To explore the link between specific genomic regions, brain structure, and neuropsychiatric disorder risk.

Main Methods:

• Analysis of magnetic resonance imaging (MRI) and genetic data from over 30,000 UK Biobank participants.
• Evaluation of the relationship between NDD-risk CNVs and brain region sizes, including the corpus callosum and cerebellum.
• Gene set enrichment analysis to identify biological pathways associated with identified genomic regions.

Main Results:

• Specific deletions in genomic regions were significantly associated with altered sizes of brain structures like the corpus callosum and cerebellum.
• Neuroanatomical changes linked to CNVs were found to confer risk for neuropsychiatric disorders.
• Gene sets within these CNV regions were enriched for critical brain development pathways and NDD-related phenotypes.

Conclusions:

• Copy number variants (CNVs) are implicated in both brain structure abnormalities and the shared pathophysiology of NDDs and other neuropsychiatric disorders.
• These findings elucidate the connection between genetic variations, neuroanatomy, and the development of neurological and psychiatric conditions.
• The study suggests potential biomarkers for improved diagnosis of NDDs and related disorders.