A single G-to-A point transition at chromosome 7 position 49,917,609 (GRCm38/mm10) causes the codon change of atG to atA resulting in the change of methionine to isoleucine in a transmembrane domain, p.M278I in NP_001139485.1 and p.M2701I in NP_683733.2. (J:222308, J:235637)