POLR3A and leukodystrophy: Finally, whole‐exome sequencing (WES) was performed in January 2019 which was reported as follows: compound heterozygote mutation in POLR3A gene (intron 13: c.1771‐6C > G, exon 31: c.4037G > A p.C1346Y) related to 4H leukodystrophy (Table 1).