Development of animal models for schizophrenia

Area of Science:

• Psychiatry
• Genetics
• Neuroscience

Background:

• Schizophrenia affects 1% of the global population, presenting with positive, negative, and cognitive symptoms.
• Strong evidence points to a complex genetic inheritance involving multiple genes, environmental factors, and stochastic influences.
• Recent genome-wide studies highlight the significant role of rare alleles and copy number variations (CNVs) in schizophrenia risk.

Purpose of the Study:

• To investigate the role of rare genetic variants, specifically CNVs, in schizophrenia.
• To leverage the genetic conservation between human and mouse models for studying schizophrenia pathogenesis.
• To develop etiologically valid animal models for exploring molecular and circuit-level abnormalities in schizophrenia.

Main Methods:

• Genome-wide scans to identify rare variants associated with schizophrenia.
• Characterization of copy number variations (CNVs) as causative mutations.
• Engineering of genetically faithful animal models by utilizing conserved syntenic regions (e.g., mouse chromosome 16 for human 22q11.2 locus).

Main Results:

• Rare alleles, particularly CNVs, are significant contributors to schizophrenia risk.
• Deletions at the 22q11.2 locus are the most common structural rearrangements associated with schizophrenia.
• Conservation of the 22q11.2 locus in mice enables the creation of valid animal models.

Conclusions:

• Understanding rare genetic variants like CNVs is key to unraveling schizophrenia's genetic architecture.
• Etiologically valid animal models, such as those for 22q11.2 deletions, are essential for studying the underlying biological mechanisms of schizophrenia.
• Genetically faithful models facilitate research into the molecular, cellular, and circuit-level disruptions in schizophrenia.