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CHRNA5/CHRNA3 gene cluster is a risk factor for lumbar disc herniation: a case-control study
Xuejun Yang1, Xiaodong Guo2, Zhi Huang1
1Spine (Thoracic and Vertebra) Department, the Second Affiliated Hospital of Inner Mongolia University, #1 Yingfang Road, Hohhot, 010050, Inner Mongolia, China.
Journal of Orthopaedic Surgery and Research
|August 1, 2019
Summary
Genetic variations in CHRNA5/CHRNA3 are linked to lumbar disc herniation risk. Specific single-nucleotide polymorphisms and haplotypes show associations with developing this chronic low back pain condition.
Area of Science:
- Genetics
- Orthopedics
- Pain Medicine
Background:
- Lumbar disc herniation (LDH) is a significant cause of chronic low back pain, often linked to intervertebral disc degeneration.
- The CHRNA5/CHRNA3 gene cluster is known for its association with smoking-related diseases.
- Investigating genetic predispositions for LDH is crucial for understanding its complex etiology.
Purpose of the Study:
- To investigate the association between single-nucleotide polymorphisms (SNPs) in the CHRNA5/CHRNA3 genes and the risk of developing lumbar disc herniation.
- To analyze genotype, allele, and haplotype frequencies in relation to LDH.
- To explore potential sex- and age-specific genetic risk factors for LDH.
Main Methods:
- A case-control study was conducted with 380 LDH patients and 400 healthy controls.
- Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) was used to determine genotype frequencies.
- Statistical analyses included allelic, genotypic, and haplotype association tests.
Main Results:
- The rs8040868 CT genotype was associated with a reduced risk of LDH in men (OR=0.46, p=0.012).
- In women, the rs8040868 CT+CC genotype also showed a protective effect against LDH (OR=0.50, p=0.019).
- The CHRNA5 "TACACCCG" haplotype was linked to decreased LDH risk overall (OR=0.79, p=0.047) but increased risk in individuals under 50 (OR=1.46, p=0.047).
Conclusions:
- Genetic variations within the CHRNA5/CHRNA3 gene region are associated with the risk of lumbar disc herniation.
- Specific SNPs and haplotypes may influence LDH susceptibility in a sex- and age-dependent manner.
- Further research is warranted to elucidate the precise mechanisms linking CHRNA5/CHRNA3 variants to LDH.
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