CDKN1C and Silver-Russell syndrome: Rarely, SRS is caused by maternal uniparental disomy of chromosome 7 (mUPD7; 7–10% of SRS cases [9,10,11]), duplications, deletions, or translocations involving chromosome 7 and by pathogenic variants in CDKN1C (maternal allele) [12], PLAG1 [13], and HMGA2 [14].