Abstract
We have evaluated the association of polymorphisms in the intronic variable-number tandem repeat (VNTR) regions of the human NKG2D, NKG2A, and IL-1RN genes with resistance and/or susceptibility to SARS-CoV-2 infection in a total of 209 patients with SARS-CoV-2 infection (125 asymptomatic patients and 84 symptomatic patients with mild symptoms) and 355 healthy controls, using the PCR-RFLP method. The genotypic and allelic frequency distributions for an IL-1RN (VNTR) single-nucleotide polymorphism (SNP) were found to be comparable among the patient groups. Overall, in SARS-CoV-2 patients, NKG2A (rs2734440) showed a protective association in the codominant [(A/A vs. A/G): (OR = 0.53, 95% CI = 0.34–0.83, p = 0.006)], recessive [(A/A vs. A/G+G/G): (OR = 0.6, 95% CI = 0.39–0.92, p = 0.02)] and over-dominant [(A/A+G/G vs. A/G): (OR = 0.57, 95% CI = 0.38–0.84, p = 0.005)] models. Similarly, NKG2D (rs7980470) showed a protective association in the codominant [(A/A vs. A/G): (OR = 0.46, 95% CI = 0.3–0.7, p = 0.0003), codominant (A/A vs. G/G): (OR = 0.54, 95% CI = 0.31–0.71, p = 0.027)], recessive [(A/A vs. A/G+G/G): (OR = 0.47, 95% CI = 0.32–0.7, p = 0.0001) and over-dominant [(A/A+G/G vs. A/G): (OR = 0.56, 95% CI = 0.38–0.82, p = 0.003)] models. At the allelic level, there was a higher frequency of the “G” allele of NKG2D (rs7980470) in healthy controls than in patients with SARS-CoV-2 infection, suggesting that individuals with the “G” allele in the intronic region of NKG2D are likely to be protected against SARS-CoV-2 infection. Overall, our data suggest that polymorphisms in the host NKG2D and NKG2A genes have a protective role in SARS-CoV-2 infection, although the functional impact of these polymorphisms on control of SARS-CoV-2 infection remains unknown.
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Acknowledgements
The authors would like to thank Mr. Vasant Walkoli, Mr. K.D. Ramaiah, Mr. Bipin Tilekar and Mr PD Sarje for their genuine effort in clinical sample collection for the study. Financial support provided by the Indian Council of Medical Research, New Delhi, is duly acknowledged.
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Conceptualization: AST. Material preparation, data collection and analysis: PW, KA, AMW. Resources: VAP, MC, NK, LN. Writing—original draft preparation: AST, KA. PW and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Tripathy, A.S., Wagh, P., Akolkar, K. et al. Association of inhibitory NKG2A and activating NKG2D natural killer cell receptor genes with resistance to SARS-CoV-2 infection in a western Indian population. Arch Virol 168, 237 (2023). https://doi.org/10.1007/s00705-023-05861-z
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DOI: https://doi.org/10.1007/s00705-023-05861-z