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Published on: April 19, 2013
Convergent lines of evidence support CAMKK2 as a schizophrenia susceptibility gene
11] College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China [2] Department of Ophthalmology and Flaum Eye Institute, University of Rochester, Rochester, NY, USA.
Abstract:
Genes that are differentially expressed between schizophrenia patients and healthy controls may have key roles in the pathogenesis of schizophrenia. We analyzed two large-scale genome-wide expression studies, which examined changes in gene expression in schizophrenia patients and their matched controls. We found calcium/calmodulin (CAM)-dependent protein kinase kinase 2 (CAMKK2) is significantly downregulated in individuals with schizophrenia in both studies. To seek the potential genetic variants that may regulate the expression of CAMKK2, we investigated the association between single-nucleotide polymorphisms (SNPs) within CAMKK2 and the expression level of CAMKK2. We found one SNP, rs1063843, which is located in intron 17 of CAMKK2, is strongly associated with the expression level of CAMKK2 in human brains (P=1.1 × 10(-6)) and lymphoblastoid cell lines (the lowest P=8.4 × 10(-6)). We further investigated the association between rs1063843 and schizophrenia in multiple independent populations (a total of 130 623 subjects) and found rs1063843 is significantly associated with schizophrenia (P=5.17 × 10(-5)). Interestingly, we found the T allele of rs1063843, which is associated with lower expression level of CAMKK2, has a higher frequency in individuals with schizophrenia in all of the tested samples, suggesting rs1063843 may be a causal variant. We also found that rs1063843 is associated with cognitive function and personality in humans. In addition, protein-protein interaction (PPI) analysis revealed that CAMKK2 participates in a highly interconnected PPI network formed by top schizophrenia genes, which further supports the potential role of CAMKK2 in the pathogenesis of schizophrenia. Taken together, these converging lines of evidence strongly suggest that CAMKK2 may have pivotal roles in schizophrenia susceptibility.
Insights
Calcium/calmodulin (CAM)-dependent protein kinase kinase 2 (CAMKK2) is downregulated in schizophrenia patients. A specific genetic variant, rs1063843, is linked to CAMKK2 expression and schizophrenia risk, impacting cognitive function.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Schizophrenia pathogenesis involves differential gene expression.
- Identifying key genes and their regulatory variants is crucial for understanding schizophrenia.
Purpose of the Study:
- To investigate the role of calcium/calmodulin (CAM)-dependent protein kinase kinase 2 (CAMKK2) in schizophrenia.
- To identify genetic variants associated with CAMKK2 expression and schizophrenia risk.
Main Methods:
- Analyzed two large-scale genome-wide expression studies.
- Investigated single-nucleotide polymorphism (SNP) association with CAMKK2 expression.
- Conducted multi-population association study for SNP rs1063843 and schizophrenia.
- Performed protein-protein interaction (PPI) network analysis.
Main Results:
- CAMKK2 was significantly downregulated in schizophrenia patients in both expression studies.
- SNP rs1063843 in intron 17 of CAMKK2 strongly associated with CAMKK2 expression levels.
- rs1063843 significantly associated with schizophrenia risk across multiple populations.
- The T allele of rs1063843, linked to lower CAMKK2 expression, was more frequent in schizophrenia patients.
- rs1063843 also associated with cognitive function and personality traits.
- CAMKK2 identified within a highly interconnected PPI network of top schizophrenia genes.
Conclusions:
- CAMKK2 downregulation and its regulatory SNP rs1063843 suggest a role in schizophrenia susceptibility.
- Converging evidence supports CAMKK2's pivotal role in the pathogenesis of schizophrenia.
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