Experimental Factor Ontology term EFO_0010252 (Menke-Hennekam syndrome 1) is a form of Menke-Hennekam syndrome, a congenital autosomal dominant disease characterized by developmental delay, growth retardation, and craniofacial dysmorphism. Patients have intellectual disability of variable severity, speech delay, autistic behavior, short stature and microcephaly. Main facial characteristics include short palpebral fissures, telecanthi, depressed nasal ridge, short nose, anteverted nares, short columella and long philtrum. Menke-Hennekam syndrome-1 (MKHK1) is caused by heterozygous mutation in exon 30 or 31 of the CREBBP gene.