Gene Discovery Linked to COVID-19 Resistance

Overview of the Study

Recent research indicates that a specific gene may offer some level of resistance to severe symptoms of COVID-19. The study reveals notable differences in the genetic make-up of individuals experiencing severe symptoms compared to those who remain asymptomatic, particularly at one gene location.

Key Findings

The study identified a significantly higher prevalence of the HLA-DRB1*04:01 gene among asymptomatic individuals. This gene is an allele within the human leukocyte antigen (HLA) family, which plays a crucial role in the immune system’s response.

Research Methodology

Conducted by a research team from Newcastle University in the United Kingdom, the study involved 49 patients suffering from COVID-19 respiratory failure who required ventilation or oxygen. Their HLA genes were compared to those of 69 hospital staff members who tested positive for COVID-19 but remained asymptomatic.

Statistical Analysis

The results indicated that the frequency of the HLA-DRB1*04:01 gene was significantly higher in asymptomatic individuals at 16.7%, compared to just 5.1% in those with severe symptoms. This suggests that HLA-DRB1*04:01 may serve as a potential gene for COVID-19 resistance.

Mechanism of Action

The HLA-DRB1*04:01 gene, like other HLA genes, encodes transmembrane proteins that present foreign antigens to T cells, a type of immune cell. These T cells recognize these signals and initiate an immune response.

Geographical Variability

Previous studies have shown that HLA allele frequencies vary geographically. The current study included participants from similar European backgrounds and two hospitals in the North East of England. A control group from the same demographic was also assessed. The HLA-DRB1*04:01 allele frequency in this control group was calculated to be 11.0%, aligning closely with the U.K. population frequency of 11.1%. Notably, populations from Northwestern Europe exhibited a higher frequency of this gene associated with COVID-19 resistance.

Implications for Future Research

Dr. Carlos Echevarria, a co-author of the study, stated, “The identification of the HLA-DRB1*04:01 gene could lead us to a genetic test which may indicate who we need to prioritize for future vaccinations.” He emphasized the importance of this knowledge at a population level, noting that individuals who are resistant may spread the virus while remaining asymptomatic.

References

Langton, D.J. et al. (2021). The influence of HLA genotype on the severity of COVID-19 infection. HLA Early View. Doi: 10.1111/tan.14284.
Gene protection for COVID-19 identified. (2021). EurekAlert! The American Association for the Advancement of Science. Accessed on June 12, 2021. Retrieved from https://www.eurekalert.org/pub_releases/2021-06/nu-gpf060421.php
Image by PublicDomainPictures from Pixabay.