Toward a modern search for schizophrenia genes

Area of Science:

• Psychiatry
• Genetics
• Neuroscience

Background:

• Genetic epidemiology confirms schizophrenia has a genetic basis.
• This genetic component is complex, polygenic, and involves gene epistasis.
• Molecular studies have not yet identified specific DNA variants contributing to schizophrenia vulnerability.

Purpose of the Study:

• To address challenges in identifying schizophrenia genes.
• To propose new analytical and phenotyping strategies for complex genetic disorders.
• To improve the definition of affected phenotypes in schizophrenia research.

Main Methods:

• Utilizing analytical methods suitable for complex multifactorial disorders.
• Gathering large-scale clinical samples for robust genetic analysis.
• Implementing novel phenotyping strategies: candidate symptom and endophenotypic approaches.

Main Results:

• The candidate symptom approach uses proband characteristics (age at onset, symptom severity) as phenotypes.
• The endophenotypic approach examines unaffected relatives, yielding positive findings in areas like P50 inhibitory gating and eye-movement dysfunctions.
• These strategies aim to overcome limitations in current diagnostic classifications for genetic validity.

Conclusions:

• New strategies are essential for advancing the search for schizophrenia genes.
• Refining phenotypes through candidate symptom and endophenotypic approaches is crucial.
• These methods enhance the ability to dissect the complex genetic architecture of schizophrenia.