Mutations in EIF2S3, encoding the eIF2γ subunit, are associated with severe intellectual disability and microcephaly, usually as part of MEHMO syndrome.
Morpholino-based knockdown of the zebrafish EIF2S3 ortholog (eif2s3) recapitulates the human microcephaly and short stature phenotype, supporting the pathogenicity of the identified variants.
Here, we show that a human X-chromosomal neurological disorder characterized by intellectual disability and microcephaly is caused by a missense mutation in eIF2γ (encoded by EIF2S3), the core subunit of the heterotrimeric eIF2 complex.