SEC61A1 and common variable immunodeficiency: A similarly permeable Sec61 channel may exist in case of CVID, where a heterozygous mutation of the SEC61A1 gene (resulting in the substitution of valine 85 by aspartate) introduces a polar amino acid side chain into the typically non-polar “pore ring” of the Sec61 channel (Schubert et al., 2017).