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This study examined the relationship between the\u00a0<jats:italic>IL-6<\/jats:italic>\u00a0(\u2212\u00a0174G\/C) gene polymorphism and mild and severe asthma, focusing on its influence on type 2 inflammation.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Our study comprised 98 patients with mild asthma and 116 with severe asthma. Additionally, we recruited 121 healthy participants to serve as controls for comparative analyses. The\u00a0<jats:italic>IL-6<\/jats:italic> gene (\u2212\u00a0174G\/C) polymorphism was assessed utilizing the polymerase chain reaction-restriction fragment length polymorphism (PCR\u2013RFLP) method.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>In our study, the risk of mild asthma exhibited a significant fourfold increase in individuals with the GG genotype pattern compared to healthy controls, yielding an odds ratio (OR) of 4.4 (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). Conversely, we found no significant correlation between the IL-6 \u2212\u00a0174G\/C gene polymorphism and severe asthma when compared to the healthy control group. However, a noteworthy pattern emerged when we compared subgroups of mild and severe asthma. The risk of severe asthma increased fivefold in individuals with the GC polymorphism pattern, with an OR of 4.99 (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001), while the likelihood of mild asthma showed a similar fourfold increase with the GG polymorphism pattern, OR\u2009=\u20094.4 (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). Consequently, we observed a significantly higher frequency of the C allele in patients with severe asthma, whereas the G allele was more prevalent in individuals with mild asthma (<jats:italic>p<\/jats:italic>\u2009=\u20090.05). Additionally, the correlation between markers of type 2 inflammation and the dominant model of the <jats:italic>IL-6<\/jats:italic> gene -174G\/C polymorphism (CC\u2009+\u2009CG vs GG) revealed a significant increase in total serum immunoglobulin E (IgE), Blood Eosinophil Counts (BEC), and Fractional Exhaled Nitric Oxide (FeNO) levels in asthmatic patients with the CC\u2009+\u2009CG gene pattern compared to those with GG, with p-values of 0.04, 0.03, and 0.04, respectively. Furthermore, after adjusting for other risk factors, the likelihood of developing severe asthma increased from fourfold to eightfold, with an OR of 8.12 (<jats:italic>p<\/jats:italic>\u2009=\u20090.01) with (CC\u2009+\u2009CG) gene pattern. Other predictors for severe asthma included older age and childhood-onset disease (OR\u2009=\u20091.13 and 19.19,\u00a0<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). Allergic rhinitis (AR) and nasal polyps (NP) also demonstrated a substantial association with an increased risk of severe asthma, with odds ratios of 5 and 32.29 (<jats:italic>p<\/jats:italic>\u2009=\u20090.01 and\u2009&lt;\u20090.001), respectively. Additionally, elevated Body Mass Index (BMI), BEC, and FeNO were linked to severe asthma, with ORs of 1.11, 1.00, and 1.04, respectively (<jats:italic>p<\/jats:italic>\u2009=\u20090.04, 0.05, and 0.001).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>This study illuminated the intricate relationship between the IL-6 gene polymorphism, type 2 inflammation markers, and diverse risk factors in shaping asthma severity. As a significant association between the GG polymorphism of the\u00a0<jats:italic>IL-6<\/jats:italic>\u00a0gene (\u2212\u00a0174G\/C) and mild asthma was found, while possessing at least one C allele, whether in a homozygous (CC) or heterozygous (CG) combination, independently predicts the likelihood of severe asthma.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s13223-024-00880-0","type":"journal-article","created":{"date-parts":[[2024,2,22]],"date-time":"2024-02-22T14:02:18Z","timestamp":1708610538000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Association between interleukin-6-174G\/C gene polymorphism and asthma severity: exploring the role of total serum IgE, blood eosinophils, and FeNO as markers of type 2 inflammation"],"prefix":"10.1186","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2950-5363","authenticated-orcid":false,"given":"Mona","family":"Al-Ahmad","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7421-5085","authenticated-orcid":false,"given":"Asmaa","family":"Ali","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ahmed","family":"Maher","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8187-0061","authenticated-orcid":false,"given":"Mohammad Z.","family":"Haider","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,2,22]]},"reference":[{"issue":"13","key":"880_CR1","doi-asserted-by":"publisher","first-page":"822091","DOI":"10.3389\/fgene.2022.822091","volume":"16","author":"Y Yang","year":"2022","unstructured":"Yang Y, Xiao J, Tang L, Wang B, Sun X, Xu Z, Liu L, Shi S. 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