FMR1 and fragile X syndrome: DGKk expression was found severely reduced in the brain of Fmr1‐KO mouse, and a perturbation of DAG/PA acid homeostasis was observed in Fmr1‐KO cortical neurons and in the brain of FXS individuals, suggestive of a decreased DGK activity and altered DAG/PA signaling (Tabet et al, 2016a).