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Updated: Jul 17, 2026
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A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
Published on: June 15, 2011
A genome-wide scan for modifier loci in schizophrenia
Ayman H Fanous1, Michael C Neale, B Todd Webb
1Washington VA Medical Center, Washington, DC 20422, USA. ayman.fanous@med.va.gov
Summary
Genetic loci influencing schizophrenia
Area of Science:
- Psychiatric Genetics
- Human Genetics
- Neuroscience
Background:
- Identifying genetic factors for psychotic illness is crucial for understanding its complex etiology.
- Previous research has focused on susceptibility genes, but loci influencing clinical presentation are less understood.
Purpose of the Study:
- To detect genetic loci that influence clinical features of psychotic illness, not just susceptibility.
- To analyze specific symptom dimensions and illness course as quantitative traits.
Main Methods:
- Utilized the Irish Study of High-Density Schizophrenia Families (n=1,408).
- Performed genome-wide quantitative trait locus linkage analysis on five symptom factors (hallucinations, delusions, negative, manic, depressive), age at onset, and illness course.
- Employed empirical significance testing and corrected for multiple comparisons using simulated genome scans.
Main Results:
- Suggestive linkage (LOD > 2.0) for illness course near 9q33.1 (D9S934) and 14q24.2 (D14S587).
- Suggestive linkage for age at onset near 6q23.1-25.1 (D6S1040-D6S2420).
- A region on 6q showed joint linkage for age of onset, illness course, delusions, and depressive symptoms (genome-wide P=0.06).
Conclusions:
- Genes near 9q33.1 and 14q24.2 may influence schizophrenia's clinical course and severity.
- A gene on chromosome 6q might affect multiple clinical features of psychotic illness.
- Further research is needed to identify specific genes and their functional roles.
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