A recent genetic association study (Ellinghaus et al. 2020) identified a gene cluster on chromosome 3 as a risk locus for respiratory failure in SARS-CoV-2. Recent data comprising 3,199 hospitalized COVID-19 patients and controls reproduce this and find that it is the major genetic risk factor for severe SARS-CoV-2 infection and hospitalization (COVID-19 Host Genetics Initiative). Here, we show that the risk is conferred by a genomic segment of ~50 kb that is inherited from Neandertals and occurs at a frequency of ~30% in south Asia and ~8% in Europe.
The highest frequency is in the 1000 Genomes Bangladesh sample. 60%. In a study of Europeans all things equal the risk allele at this locus increases odds of respiratory failure by a factor of 1.75. This isn’t really the major factor; age and hypertension, all the things you know, matter more. But, it’s not trivial either to increase risk by 1.75.
If you are on 23andMe and got tested before the summer of 2017, the older chips has a marker for the locus that’s informative (in LD with the haplotype). This link should take you there. I’m TT homozygote. Modern human. A C is for Neanderthals.