We found evidence for a shared causal variant between the risk of type 1 diabetes and whole-blood IL2RA (rs61839660, posterior probability 100%, Fig. 1), IL6R (rs10908839, posterior probability 96.5%, Fig. 2) and IL6ST gene expression (rs7731626, posterior probability 97.0%, Table 2 and ESM Fig. 4). Here, IL6ST is linked to type 1 diabetes mellitus.