Because spontaneous pathogenic variants in some MODY genes can lead to insulin requiring diabetes and can be easily misdiagnosed for T1D [2], the patient underwent a screening of ABCC8, APPL1, GATA4, GATA6, GCK, HNF1A, HNF1B, HNF4A, INS, KCNJ11, NEUROD1, PDX1 and RFX6 genes by next generation sequencing (NGS). This evidence concerns the gene HNF1A and diabetes mellitus.