PRUNE1 and microcephaly: Homozygous or compound heterozygous mutations in the PRUNE1 gene cause the neurodevelopmental disorder with microcephaly, hypotonia, and variable brain anomalies (NMIHBA) (OMIM#617481) that is characterized by global developmental delay, microcephaly, central hypotonia, spastic quadriplegia, and cerebral and cerebellar atrophy [1].