Because of the relatively high frequency of mutations in RIT1 among patients with NS and its occurrence in different populations, we suggest that it should be added to the list of genes included in panels for the molecular diagnosis of NS through targeted next-generation sequencing.
Expression of the mutant RASA2, MAP2K1, or RIT1 alleles in heterologous cells increased RAS-ERK pathway activation, supporting a causative role in NS pathogenesis.
Expression of the mutant RASA2, MAP2K1, or RIT1 alleles in heterologous cells increased RAS-ERK pathway activation, supporting a causative role in NS pathogenesis.
These results demonstrate that gain-of-function mutations in RIT1 cause Noonan syndrome and show a similar biological effect to mutations in other RASopathy-related genes.