Author/Editor		Mignogna, Maria Lidia; Giannandrea, Maila; Gurgone, Antonia; Fanelli, Francesca; Raimondi, Francesco; Mapelli, Lisa; Bassani, Silvia; Fang, Huaqiang; Van Anken, Eelco; D'Adamo, Patrizia
Title		The intellectual disability protein RAB39B selectively regulates GluA2 trafficking to determine synaptic AMPAR composition
Type		članek
Vol. and No.		Letnik 6
Publication year		2015
ISSN		2041-1723 - Nature communications
Language		eng
Abstract		RAB39B is a member of the RAB family of small GTPases that controls intracellular vesicular trafficking in a compartment-specific manner. Mutations in the RAB39B gene cause intellectual disability comorbid with autism spectrum disorder and epilepsy, but the impact of RAB39B loss of function on synaptic activity is largely unexplained. Here we show that protein interacting with C-kinase 1 (PICK1) is a downstream effector of GTP-bound RAB39B and that RAB39B-PICK1 controls trafficking from the endoplasmic reticulum to the Golgi and, hence, surface expression of GluA2, a subunit of alpha-amino-3-hydroxy-5-methyl-4-iso- xazole propionic acid receptors (AMPARs). The role of AMPARs in synaptic transmission varies depending on the combination of subunits (GluA1, GluA2 and GluA3) they incorporate. RAB39B downregulation in mouse hippocampal neurons skews AMPAR composition towards non GluA2-containing Ca 2+ -permeable forms and thereby alters synaptic activity, specifi- cally in hippocampal neurons. We posit that the resulting alteration in synaptic function underlies cognitive dysfunction in RAB39B-related disorders.
Keywords		autism spectrum disorder mutations intellectual disability motnje avtističnega spektra mutacije motnje v duševnem razvoju