title: Fragile X Proteins FMRP and FXR2P Control Synaptic GluA1 Expression and Neuronal Maturation via Distinct Mechanisms.
abstract: Fragile X mental retardation protein (FMRP) and its autosomal paralog FXR2P are selective neuronal RNA-binding proteins, and mice that lack either protein exhibit cognitive deficits. Although double-mutant mice display more severe learning deficits than single mutants, the molecular mechanism behind this remains unknown. In the present study, we discovered that FXR2P (also known as FXR2) is important for neuronal dendritic development. FMRP and FXR2P additively promote the maturation of new neurons by regulating a common target, the AMPA receptor GluA1, but they do so via distinct mechanisms: FXR2P binds and stabilizes GluA1 mRNA and enhances subsequent protein expression, whereas FMRP promotes GluA1 membrane delivery. Our findings unveil important roles for FXR2P and GluA1 in neuronal development, uncover a regulatory mechanism of GluA1, and reveal a functional convergence between fragile X proteins in neuronal development.
authors.affiliation: State Key Laboratory for Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA; Department of Neuroscience, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI 53705, USA.
authors.forename: Weixiang
authors.initials: W
authors.lastname: Guo
authors.affiliation: Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA; Department of Neuroscience, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI 53705, USA.
authors.forename: Eric D
authors.initials: ED
authors.lastname: Polich
authors.affiliation: Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA; Department of Neuroscience, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI 53705, USA.
authors.forename: Juan
authors.initials: J
authors.lastname: Su
authors.affiliation: Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA; Department of Neuroscience, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI 53705, USA.
authors.forename: Yu
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Department of Neurosciences, University of New Mexico, Albuquerque, NM 87131, USA.
authors.forename: Devin M
authors.initials: DM
authors.lastname: Christopher
authors.affiliation: Department of Neurosciences, University of New Mexico, Albuquerque, NM 87131, USA.
authors.forename: Andrea M
authors.initials: AM
authors.lastname: Allan
authors.affiliation: State Key Laboratory for Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Min
authors.initials: M
authors.lastname: Wang
authors.affiliation: Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA; Department of Neuroscience, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI 53705, USA.
authors.forename: Feifei
authors.initials: F
authors.lastname: Wang
authors.affiliation: Department of Pharmacology, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.
authors.forename: Guangfu
authors.initials: G
authors.lastname: Wang
authors.affiliation: Waisman Center, University of Wisconsin-Madison, Madison, WI 53705, USA; Department of Neuroscience, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI 53705, USA. Electronic address: xzhao69@wisc.edu.
authors.forename: Xinyu
authors.initials: X
authors.lastname: Zhao
mesh_terms: D000818:Animals; D051860:Fragile X Messenger Ribonucleoprotein 1 / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009474:Neurons / Q000166:cytology* / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D018091:Receptors, AMPA / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D051860:Fragile X Messenger Ribonucleoprotein 1; D016601:RNA-Binding Proteins; D018091:Receptors, AMPA; C512309:FXR2 protein, mouse; C497684:Fmr1 protein, mouse