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Updated: Mar 6, 2026
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Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
Published on: January 7, 2014
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Association between gene polymorphism and depression in Parkinson's disease: A case-control study
Jinhua Zheng1, Xinglong Yang1, Quanzhen Zhao1
1Department of Neurology, West China Hospital, Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan Province 610041, PR China.
Journal of the Neurological Sciences
|March 22, 2017
Summary
Parkinson's disease (PD) patients with depression showed genetic links to specific gene polymorphisms. These findings in SLC6A15 and TPH2 genes may clarify depression's role in PD.
Area of Science:
- Genetics
- Neuroscience
- Psychiatry
Background:
- Parkinson's disease (PD) is a neurodegenerative disorder.
- Depression is a common comorbidity in PD patients.
- The genetic underpinnings of depression in PD are not fully understood.
Purpose of the Study:
- To explore associations between PD and genetic variations in depression-related genes.
- To investigate the role of alpha-synuclein (SNCA) gene polymorphisms in PD with depression.
Main Methods:
- Genotyping of 330 PD patients for single-nucleotide polymorphisms (SNPs) in depression-related genes and the SNCA gene.
- Dividing patients into groups with and without depression for comparative analysis.
- Utilizing univariate and logistic regression analyses to identify risk factors.
Main Results:
- Significant differences in allele and genotype frequencies were observed at rs1545843 (SLC6A15) and rs78162420 (TPH2) between PD patients with and without depression.
- Higher Hoehn and Yahr stage (p=0.037), AA genotype at rs1545843 (p=0.044), and AC genotype at rs78162420 (p=0.011) were identified as risk factors for depression in PD.
Conclusions:
- Depression in PD is significantly associated with specific polymorphisms in the SLC6A15 and TPH2 genes.
- These genetic variations may contribute to the pathogenesis of depression in Parkinson's disease.
- Further research can elucidate the complex interplay between genetics, PD, and depression.
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