SP-D polymorphisms and the risk of COPD.
Tania A Shakoori1, Don D Sin, S Nazim Hussain Bokhari
1University of Health Science, Lahore, Pakistan. drtaniashakoori@yahoo.com
Disease Markers
|August 1, 2012
Summary
Genetic variations in surfactant protein D (SP-D) influence its serum levels and the risk of Chronic Obstructive Pulmonary Disease (COPD). Higher SP-D levels are linked to COPD exacerbations, regardless of genetic factors.
Area of Science:
- Pulmonary Medicine
- Genetics
- Biochemistry
Background:
- Limited data exist on the association between serum surfactant protein D (SP-D) levels, its genetic polymorphisms, and the risk of Chronic Obstructive Pulmonary Disease (COPD).
- Understanding these links is crucial for identifying novel biomarkers and therapeutic targets for COPD.
Purpose of the Study:
- To investigate the relationship between serum SP-D levels, specific genetic polymorphisms (rs721917, rs2243639, rs3088308), and the risk of developing COPD.
- To explore the association between serum SP-D levels and COPD exacerbations.
Main Methods:
- A case-control study design was employed, including 115 COPD patients diagnosed via spirometry (FEV1/FVC < 0.7) and 106 healthy controls.
- Single nucleotide polymorphisms (SNPs) were genotyped using polymerase chain reaction (PCR) and restriction analysis.
- Serum SP-D levels were quantified using a specific immunoassay.
Main Results:
- Allele 'A' at rs3088308 and allele 'C' at rs721917 were associated with reduced serum SP-D levels.
- The 'T/T' genotype at rs721917 was significantly linked to an increased risk of COPD.
- Patients experiencing recurrent COPD exacerbations exhibited higher serum SP-D levels, even after accounting for genetic influences.
Conclusions:
- The study identifies rs3088308 as a novel factor influencing systemic SP-D levels.
- The findings confirm the previously reported association between rs721917 and both COPD risk and serum SP-D levels.
- Elevated serum SP-D levels in patients with frequent exacerbations suggest its potential role in COPD pathogenesis and progression.
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