Introduction
Chronic obstructive pulmonary disease (COPD) is a chronic respiratory disorder that progresses slowly and is characterized by an obstructive ventilatory pattern, which is rarely reversible. The main risk factors are active smoking, genetic factors, and air pollution. In particular, COPD has been a major public health problem and will remain a challenge for clinicians in the 21st century. In recent years, COPD has been the focus of pulmonary research given its high prevalence and increased morbidity and mortality rates, which pose formidable challenges for health-care systems. The projection for 2020 indicates that COPD will be the third leading cause of death worldwide, which is responsible for early mortality, high death rates, and significant cost to health systems.1,2
Kashi city is located to the west of XinJiang province, China, and is close to Taklamakan desert which is the second largest desert in the world. The desert climate and geographic location of Kashi area are favorable for the development of COPD, because people living in this area are frequently exposed to dust storms. In these conditions, the prevalence rates of COPD increase yearly, and the Uyghur population appear most affected with COPD in the Kashi area. Furthermore, we found that the increased incidence of COPD in this area is also related to genetic factors and customs of the local people. In this study, we investigated the unique polymorphic site in the exonic region of the SREK1 gene and discuss the relationship between the SREK1 gene SNP in the rs74794265 locus and the susceptibility to COPD among the Uyghur population in Kashi, XinJiang, China.
SREK1 is a member of the SR protein superfamily with an additional glutamic acid-lysine (EK)-rich domain that regulates RNA processing by modulating multiple SR proteins. The SR proteins play significant roles in constitutive and alternative splicing of pre-mRNAs as well as in nuclear export, nonsense-mediated decay, and translation of mRNAs.3 SREK1 is a direct interactor and regulator of SRSF6 and is particularly interesting because one of its target mRNAs is the TATA-box binding protein associated factor 1 (TAF1).4 A previous study showed that SRSF6 regulates alternative splicing of genes involved in DNA damage response and DNA repair in HeLa cells.5 However, thus far, no study has shown the correlation between SREK1 and COPD. Sanger sequencing showed that only one SNP of the SREK1 gene was founded and SREK1 gene polymorphism confers protection against COPD. The role of rs74794265 in the regulation of SREK1 expression levels and the mechanisms via which it influences COPD require further investigation.
A total of 1075 subjects were included in this study: 541 patients with COPD in the case group and 534 healthy people in the control group. COPD patients were diagnosed based on the results from multiple examinations including the ratio of forced expiratory volume in 1 second/forced vital capacity (FEV1/FVC ratio, 70%) and FEV1 (80% predicted), according to the Global Initiative for Chronic Obstructive Lung Disease criteria.6 All patients and controls were matched for age, sex, and BMI; all subjects underwent pulmonary function testing and showed normal spirometry results. The exclusion criteria for the control group were: 1) other respiratory diseases such as asthma, tuberculosis, fibrosis, or lung cancer; 2) suffering from any respiratory symptoms or non-respiratory diseases such as diabetes or cardiovascular disease; 3) unable to perform the pulmonary function tests.
All subjects were required to complete a questionnaire about basic information and provide 5 mL peripheral blood for testing. Written informed consent was obtained from all participating subjects. The project was approved by the Ethics Committee of the First Peoples Hospital of Kashi. This study was conducted in accordance with the tenets of the Declaration of Helsinki.
Data analyses were performed using SPSS software (version 18.0, IBM Corporation, Armonk, NY, USA). Quantitative data are presented as meanstandard deviation or medians (interquartile ranges). Independent t-test was used to compare the difference between age and BMI, because this data showed approximately normal distribution which was supported by the QQ plots. Annual household income, FEV1%, and FEV1/FVC not conforming to normal or approximately normal distribution were compared using MannWhitney U-test. Differences in sex, smoking status, smoking index, coal combustion (Burning coal for cooking and heating), and charcoal combustion (Burning charcoal for cooking and heating) were assessed by chi-square test (2). The SNP genotypic distribution in all subjects was evaluated by HardyWeinberg equilibrium (HWE), using the Fishers exact test. Unconditional logistic regression analysis was performed to identify independent risk factors of COPD in each SNP genetic model. Odds ratio (OR), 95% confidence intervals (CI), and stratified analysis were presented by multivariable logistic regression analysis before or after adjusting for age, sex, and BMI. For all analyses, P<0.05 was considered to indicate statistical significance. The relationship between the COPD risk and the tag-SNPs under different genotypic models was designed for analysis by SNP Stats.7
The characteristics of all objects including average age, BMI, smoking, and pulmonary function (FEV, FVC) were significantly different between the patient and control groups shown in Table 1.
Table 1 Characteristics of the Study Population
The multiple logistic regression model was adjusted for age, sex, and smoking history in all subjects, and the HWE analysis was applied. Results of the HWE analysis are shown in Table 2. After adjusting for age, sex, and BMI among COPD patients, all data were analyzed using unconditional logistic regression analysis. Table 3 shows the results of the logistic regression model wherein the SNP of the rs74794265 locus SREK1 gene included two genotypes of C/C and C/T respectively; In the Additive and Dominant genetic model, the risk of COPD was significantly lower in the case group with heterozygous C/T in rs74794265 [p=0.0236, OR=0.3677 (0.15470.8742)], and the gene frequency of T was also significantly lower in the allele model in the case group [p=0.0245, OR=0.3728 (0.15770.8811)]. We speculate that the heterozygous C/T genotype can confer further protection against COPD.
Table 2 HWE Analysis
Table 3 Analysis of Genotypes of Rs74794265
Smoking is considered the main risk factor of COPD in reports;8,9 therefore, we explored the SREK1 gene SNP in the rs74794265 locus in smokers to explore the correlation the rs74794265 SNP with smoking. We evaluated the covariates related with smoking, including annual household income, coal combustion and charcoal combustion (Table 1). There were no significant differences between the cases and controls. Interestingly, there was only one SNP frequency in the smokers with heterozygous C/T in rs74794265 (Table 4). There was no significant difference in smoking status between the case and control groups in any genetic model. Table 5 showed that among the no smokers, there were significant differences with heterozygous C/T in rs74794265 in all genetic models between the cases and controls, and the frequency of the T allele was also significantly lower in the Allele model in the case group than the control group. This indicates that the SNP of rs74794265 has no correlation with smoking status.
Table 4 SNP of Rs74794265 Among Smokers
Table 5 SNP of Rs74794265 in No Smokers
COPD is a lung disease characterized by incomplete reversible airflow limitation, which progressively develops and is associated with lung damage particles and gas abnormalities of the inflammatory response. Studies10 have indicated the existence of familial clustering of COPD. A twin study showed that a higher risk of COPD was found in identical twins than in fraternal twins, and 60% of individual risks were determined by genetic factors.11 Therefore, investigation of genetic factors may be beneficial for the early prevention and diagnosis of COPD.
In our current study, we investigated 1075 subjects belonging to the Uyghur population from the Kashi region and found that the unique polymorphic site of the SREK1 gene with heterozygous C/T in rs74794265 was apparently associated with reducing COPD risk in this population who have lived here for a long term. Moreover, reports point out that tobacco smoke exposure is the primary risk factor of COPD and 1015% of smokers finally develop COPD.8,9 Therefore, we compared the SNP of rs74794265 among non-smoking COPD patients and found that there was no correlation between rs74794265 and smoking status. This indicated that the occurrence of COPD in this area is most likely related to poor air condition and genetic factors than smoking because of the special geographical location of Kashi.
Several GWAS have reported that multiple SNPs in the CXCL10,12 ADRB2,13 HHIP,14 and SERPIN215 genes contribute to COPD susceptibility. However, association of the SNPs in the SREK1 gene with COPD is still poorly understood. Our findings first revealed the rs74794265 locus on SREK1 is obviously related to COPD susceptibility. As the major risk factor for COPD, the associations of cigarette smoking with SNPs variants were evaluated. Stratified analysis showed that the rs74794265 SNP was no significant difference in smoking status between the case and control groups in any genetic model. In addition, silicosis, which is a chronic progressive fibrotic lung inflammation, may increase the risk of COPD. Research indicates that the functional variant of the CPM gene16 and the rs2609255 polymorphism in the FAM13A gene17 are associated with silicosis susceptibility in a Chinese population. In our study, we discussed the susceptibility of SREK1 rs74794265 C>T polymorphism in COPD. However, whether the rs74794265 SNP was directly associated with COPD or through silicosis increase the risk of COPD, remains unclear.
Our study has some limitations. The number of subjects was relatively small and the effects of second-hand smoke or other smoke-inhalation methods in non-smoking individuals were not considered. In summary, to our knowledge, this is the first account of the beneficial association of the rs74794265 SNP in the SREK1 gene with COPD and in Uyghur population residing in the Kashi region.
The project was approved by the Ethics Committee of First Peoples Hospital of Kashi. This study was conducted in accordance with the tenets of the Declaration of Helsinki.
Zulipikaer Abudureheman, Li Li, and XueMei Zhong contributed equally to this work as primary authors (co-first authors). Aimin Xu and Xiaoguang Zou are co-corresponding authors.
Tianshan Youth Project of Xinjiang Uyghur Autonomous Region (2019Q143).
I would like to declare on behalf of my co-authors that our paper was submitted solely to this journal and the work described is original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part.
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4. Hernndez IH, Cabrera JR, Santos-Galindo M, et al. Pathogenic SREK1 decrease in Huntingtons disease lowers TAF1 mimicking X-linked dystonia parkinsonism. Brain. 2020;143(7):22072219.
5. Xiao Y, Peng Z, Shuqiang F, et al. SRSF6 regulates alternative splicing of genes involved in DNA damage response and DNA repair in HeLa cells. Oncol Rep. 2020;44(5):18511862.
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14. Ortega-Martnez A, Prez-Rubio G, Ambrocio-Ortiz E, et al. The SNP rs13147758 in the HHIP gene is associated with COPD susceptibility, serum, and sputum protein levels in smokers. Front Genet. 2020;11:882.
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17. Wang W, Yu Y, Wu S, et al. The rs2609255 polymorphism in the FAM13A gene is reproducibly associated with silicosis susceptibility in a Chinese population. Gene. 2018;661:196201.
Continued here:
SNP of the SREK1 gene is associated with COPD in Kashi | COPD - Dove Medical Press
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