Together with previously reported cases, patients with DYRK1A mutations share many clinical features and may have a recognizable phenotype that includes, by decreasing order of frequency: developmental delay or ID with behaviors suggesting autism spectrum disorder, microcephaly, epileptic seizures, facial dysmorphism including ear anomalies (large ears, hypoplastic lobes), thin lips, short philtrum and frontal bossing.
Truncation of DYRK1A in patients with developmental delay (DD) and autism spectrum disorder (ASD) suggests a different pathology associated with loss-of-function mutations.