Signal Transduction and Targeted Therapy (Apr 2022)

A genetic variant in IL-6 lowering its expression is protective for critical patients with COVID-19

  • Bo Gong,
  • Lulin Huang,
  • Yongquan He,
  • Wen Xie,
  • Yi Yin,
  • Yi Shi,
  • Jialing Xiao,
  • Ling Zhong,
  • Yi Zhang,
  • Zhilin Jiang,
  • Fang Hao,
  • Yu Zhou,
  • Huan Li,
  • Li Jiang,
  • Xingxiang Yang,
  • Xiangrong Song,
  • Yan Kang,
  • Lin Tuo,
  • Yi Huang,
  • Ping Shuai,
  • Yuping Liu,
  • Fang Zheng,
  • Zhenglin Yang

DOI
https://doi.org/10.1038/s41392-022-00923-1
Journal volume & issue
Vol. 7, no. 1
pp. 1 – 7

Abstract

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Abstract Critical coronavirus disease 2019 (COVID-19) is associated with high mortality and potential genetic factors have been reported to be involved in the development of critical COVID-19. We performed a genome-wide association study to identify the genetic factors responsible for developing critical COVID-19. 632 critical patients with COVID-19 and 3021 healthy controls from the Chinese population were recruited. First, we identified a genome-wide significant difference of IL-6 rs2069837 (p = 9.73 × 10−15, OR = 0.41) between 437 critical patients with COVID-19 and 2551 normal controls in the discovery cohort. When replicated these findings in a set of 195 patients with critical COVID-19 and 470 healthy controls, we detected significant association of rs2069837 with COVID-19 (p = 8.89 × 10−3, OR = 0.67). This variant surpassed the formal threshold for genome-wide significance (combined p = 4.64 × 10−16, OR = 0.49). Further analysis revealed that there was a significantly stronger expression of IL-6 in the serum from patients with critical COVID-19 than in that from patients with asymptomatic COVID-19. An in vitro assay showed that the A to G allele changes in rs2069837 within IL-6 obviously decreased the luciferase expression activity. When analyzing the effect of this variant on the IL-6 in the serum based on the rs2069837 genotype, we found that the A to G variation in rs2069837 decreased the expression of IL-6, especially in the male. Overall, we identified a genetic variant in IL-6 that protects against critical conditions with COVID-19 though decreasing IL-6 expression in the serum.