ZFP57 and transient neonatal diabetes mellitus: In particular, zygotic biallelic variants of the ZFP57 gene have been found in case of Transient Neonatal Diabetes Mellitus (TNDM) [14], while biallelic or heterozygous variants affecting some of the genes encoding the subcortical maternal complex (SCMC) proteins have been identified in the healthy mothers of children affected by BWS or SRS [13, 15–19].