Downstream Neighbour of SON (DONSON, MIM *611428) gene, encoding a replisome component ensuring stabilisation of the replication fork, has been linked with two relatively similar autosomal recessive OMIM phenotypes: (1) microcephaly micromelia syndrome (MIM # 251230) [42, 43] and (2) microcephaly, short stature and limb abnormalities (MIM # 617604). Here, DONSON is linked to microcephaly.