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PurposeWe characterize the phenotypes of six unrelated individuals with intellectual disability and autism spectrum disorder, who carry heterozygous missense-variants of the PRKAR1B gene.MethodsVariants of PRKAR1B were identified by single-exome or trio-exome analysis. We contacted the families and physicians of the six individuals in order to collect clinical and phenotypic information.ResultsPRKAR1B encodes the R1β subunit of the cyclic AMP-dependent protein kinase A (PKA), and is predominantly expressed in the central nervous system. Recent studies of patient cohorts with neurodevelopmental disorders found significant enrichment of de novo missense variants in PRKAR1B, and in vivo studies of the murine ortholog demonstrated altered hippocampal function and reduced neurogenic inflammation and long-term nociceptive pain in R1β-deficient mice.In our study, de novo origin of the PRKAR1B-variants could be confirmed in five out of six individuals, and four carried the same heterozygous de novo variant c.1003C>T (p. Arg335Trp; NM_001164760). Global developmental delay, autism spectrum disorder, and apraxia/dyspraxia has been reported in all six, and reduced pain sensitivity was found in three individuals carrying the c.1003C>T variant.ConclusionOur study provides strong evidence for a novel, PRKAR1B-related neurodevelopmental disorder.