New Genomics Discoveries Across the Bipolar Disorder Spectrum Implicate Neurobiological and Developmental Pathways.

Area of Science:

• Psychiatry
• Genetics
• Genomics

Background:

• Bipolar disorder (BD) is a highly heritable mental disorder impacting millions globally.
• Recent advancements have significantly improved understanding of BD's genetic causes and biological underpinnings.

Purpose of the Study:

• To review progress in identifying common genetic variants for bipolar disorder.
• To highlight the need for further research into rare genetic variations and subtype-specific genetic architectures in BD.
• To emphasize the importance of diverse ancestral representation in future genetic studies.

Main Methods:

• Review of recent genome-wide association studies (GWAS) for bipolar disorder.
• Analysis of common and rare variant contributions to BD heritability.
• Consideration of genetic architecture differences across BD subtypes.

Main Results:

• Significant progress in identifying common variant signals for BD.
• Polygenic scores derived from GWAS show potential clinical utility when combined with other risk factors.
• Genes associated with common variant loci are enriched for rare variations, suggesting a role for rare variants.

Conclusions:

• Genetic studies of bipolar disorder subtypes are crucial for identifying specific signals and biological mechanisms.
• Increased sample sizes for subtype-specific GWAS are necessary.
• Future genetic research must ensure global representation and account for cultural and geographical differences.