Subsequent analysis of our data repository identified three additional unrelated patients with overlapping phenotypes, including NDD and ataxia, with homozygous loss of function variants in ITFG2 (NM_018463.3:c.848-1G>A; NM_018463.3:c.704dupC, p.(Ala236fs), NM_018463.3:c.1000_1001delAT, p.(Ile334fs)). This evidence concerns the gene ITFG2 and cerebellar ataxia.