Title: Mutations in ionotropic AMPA receptor 3 alter channel properties and are associated with moderate cognitive impairment in humans
Authors: Wu, Ye ×
Arai, Amy C
Rumbaugh, Gavin
Srivastava, Anand K
Turner, Gillian
Hayashi, Takashi
Suzuki, Erika
Jiang, Yuwu
Zhang, Lilei
Rodriguez, Jayson
Boyle, Jackie
Tarpey, Patrick
Raymond, F Lucy
Nevelsteen, Joke
Froyen, Guido
Stratton, Mike
Futreal, Andy
Gecz, Jozef
Stevenson, Roger
Schwartz, Charles E
Valle, David
Huganir, Richard L
Wang, Tao #
Issue Date: 22-Nov-2007
Series Title: Proceedings of the National Academy of Sciences of the United States of America vol:104 issue:46 pages:18163-18168
Abstract: Ionotropic alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors (iGluRs) mediate the majority of excitatory synaptic transmission in the CNS and are essential for the induction and maintenance of long-term potentiation and long-term depression, two cellular models of learning and memory. We identified a genomic deletion (0.4 Mb) involving the entire GRIA3 (encoding iGluR3) by using an X-array comparative genomic hybridization (CGH) and four missense variants (G833R, M706T, R631S, and R450Q) in functional domains of iGluR3 by sequencing 400 males with X-linked mental retardation (XLMR). Three variants were found in males with moderate MR and were absent in 500 control males. Expression studies in HEK293 cells showed that G833R resulted in a 78% reduction of iGluR3 due to protein misfolding. Whole-cell recording studies of iGluR3 homomers in HEK293 cells revealed that neither iGluR3-M706T (S2 domain) nor iGluR3-R631S (near channel core) had substantial channel function, whereas R450Q (S1 domain) was associated with accelerated receptor desensitization. When forming heteromeric receptors with iGluR2 in HEK293 cells, all four iGluR3 variants had altered desensitization kinetics. Our study provides the genetic and functional evidence that mutant iGluR3 with altered kinetic properties is associated with moderate cognitive impairment in humans.
ISSN: 0027-8424
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Genetics Section (-)
Human Genome Laboratory
Department of Human Genetics - miscellaneous
× corresponding author
# (joint) last author

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