Genome-wide approaches to schizophrenia

Area of Science:

• Psychiatric Genetics
• Molecular Psychiatry
• Human Genetics

Background:

• Schizophrenia (SZ) is a severe psychiatric disorder with significant genetic and environmental risk factors.
• High heritability of SZ underscores the importance of genetic research.
• Over two decades of molecular genetics research have paved the way for recent advancements.

Purpose of the Study:

• To present recent progress in understanding the genetic architecture of schizophrenia.
• To identify chromosomal regions and genetic mechanisms associated with SZ risk.
• To explore the genetic overlap between SZ, autism, and bipolar disorder.

Main Methods:

• Genome-wide association studies (GWAS) to identify common polymorphisms associated with SZ.
• Analysis of rare (<1%) and large (>100kb) copy number variants (CNVs).
• Comparative genetic analysis to investigate overlap with autism and bipolar disorder.

Main Results:

• Identification of specific chromosomal regions (MHC at 6p22-p21, 18q21.2, 2q32.1) associated with SZ.
• Evidence supporting polygenic inheritance and the role of rare CNVs in SZ.
• Demonstration of genetic overlap between SZ, autism, and bipolar disorder, challenging traditional classifications.

Conclusions:

• New genetic findings provide biological leads for SZ but require further translation into causal mechanisms.
• A significant portion of SZ heritability remains unexplained, termed 'missing heritability'.
• Future research integrating deep resequencing and systems biology approaches is crucial for a comprehensive understanding of SZ genetics.