An acrofacial dysostosis characterized by a spectrum of mandibulofacial dysostosis phenotypes, such as cleft palate, micrognathia, malar flattening, microcephaly and, in some cases, extrafacial skeletal defects. It is that has_material_basis_in heterozygous mutation in the POLR1A gene on chromosome 2p11. [ http://purl.obolibrary.org/obo/ECO_0007645 ]