GCK and MODY: Information about rs1554335421 (IVS5 –1G>A)of GCK is absent in the 1000 Genomes Project, The ExomeAggregation Consortium, and GNOMAD (https://gnomad.broadinstitute.org/) databases; however, taking into accountthe previous study and the data we obtained here, carriage ofthe A allele at position –1 of intron 5 is most likely a causative dominant variant of the GCK gene in MODY-affected people.