An article in the latest issue of the New England Journal of Medicine takes a look at the sharing of genetic risk factors between type 1 diabetes and celiac disease, two reasonably common auto-immune disorders (affecting ~0.4 and ~0.1%, respectively, of individuals of northern European origin).
Celiac disease is more common in type 1 diabetes than in the general population, so there's some reason to expect some shared genetic risk factors between the two disease. And indeed in this study the degree of overlap in risk genes between the two diseases is striking - out of 25 genes with a well-…