Genome-wide copy number variation association study in anorexia nervosa.

Area of Science:

• Genetics
• Neuroscience
• Metabolic Disorders

Background:

• Large, rare copy number variants (CNVs) are linked to neurodevelopmental disorders and schizophrenia, but their role in anorexia nervosa (AN) remains unclear.
• Previous research has not established a clear genetic link between rare CNVs and the etiology of AN.

Purpose of the Study:

• To investigate the association of established syndromic and pleiotropic CNVs with AN.
• To identify novel rare CNV regions (CNVRs) associated with AN risk using genome-wide association studies (GWAS).

Main Methods:

• Utilized genome-wide association study (GWAS) array data from the Anorexia Nervosa Genetics Initiative (ANGI) comprising 7414 AN cases and 5044 controls.
• Examined 67 known syndromic CNVs and 178 dosage-sensitive CNVs associated with various diseases.
• Conducted a genome-wide association study focused on rare CNV breakpoints (CNV-GWAS) to discover novel AN-associated CNVRs.

Main Results:

• No significant enrichment of rare deletions or duplications was found in AN.
• None of the investigated syndromic or pleiotropic CNVs showed a significant association with AN status.
• CNV-GWAS identified 21 nominally associated CNVRs, including genes involved in synaptic function, metabolism, and lipid transport (e.g., CD36).
• CNVRs associated with neurodevelopmental traits, such as NRXN1, IMMP2L, and PTPRD, were also identified.

Conclusions:

• Rare CNVs appear to have a limited role in the etiology of AN, similar to their role in bipolar disorder.
• The findings support AN as a metabo-psychiatric disorder with a common genetic architecture.
• The identified CNVRs provide potential targets for future replication studies and a deeper understanding of AN's genetic underpinnings.