NEUROD1 and MODY: Early-onset diabetes due to homozygous or heterozygous NEUROD1 mutations have also been reported in human patients (Kristinsson et al., 2001; Liu et al., 2007; Gonsorčíková et al., 2008; Rubio-Cabezas et al., 2010; Chapla et al., 2015; Bouillet et al., 2020; Brodosi et al., 2021), thus NEUROD1 is associated with maturity-onset diabetes of the young (MODY), i.e., MODY6 (Horikawa and Enya, 2019).