Cited by 109Genetics and Neurodevelopmental DisordersNeuroscience and Neuropharmacology ResearchMemory and Neural Mechanisms

Conserved Hippocampal Cellular Pathophysiology but Distinct Behavioural Deficits in a New Rat Model of FXS

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Till, Sally M., Asiminas, Antonis, Jackson, Adam D., Katsanevaki, Danai, Barnes, Stephanie A., Osterweil, Emily K., Bear, Mark F., Chattarji, Sumantra +3 more·2015·Human Molecular Genetics

Abstract

Recent advances in techniques for manipulating genomes have allowed the generation of transgenic animals other than mice. These new models enable cross-mammalian comparison of neurological disease from core cellular pathophysiology to circuit and behavioural endophenotypes. Moreover they will enable us to directly test whether common cellular dysfunction or behavioural outcomes of a genetic mutation are more conserved across species. Using a new rat model of Fragile X Syndrome, we report that Fmr1 knockout (KO) rats exhibit elevated basal protein synthesis and an increase in mGluR-dependent long-term depression in CA1 of the hippocampus that is independent of new protein synthesis. These defects in plasticity are accompanied by an increase in dendritic spine density selectively in apical dendrites and subtle changes in dendritic spine morphology of CA1 pyramidal neurons. Behaviourally, Fmr1 KO rats show deficits in hippocampal-dependent, but not hippocampal-independent, forms of associative recognition memory indicating that the loss of fragile X mental retardation protein (FMRP) causes defects in episodic-like memory. In contrast to previous reports from mice, Fmr1 KO rats show no deficits in spatial reference memory reversal learning. One-trial spatial learning in a delayed matching to place water maze task was also not affected by the loss of FMRP in rats. This is the first evidence for conservation across mammalian species of cellular and physiological hippocampal phenotypes associated with the loss of FMRP. Furthermore, while key cellular phenotypes are conserved they manifest in distinct behavioural dysfunction. Finally, our data reveal novel information about the selective role of FMRP in hippocampus-dependent associative memory.

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  • The deletion of exon 8 in the Fmr1-Δexon 8 rat is sufficient to cause FXS-like traits, such as deficits in sustained visuospatial attention, altered patterns of social interaction, cognitive impairment, and abnormal synaptic plasticity.

    “Such deletion is sufficient to cause FXS-like traits, such as deficits in sustained visuospatial attention [34], altered patterns of social interaction, and cognitive impairment [28], together with abnormal synaptic plasticity [32,35,36].”

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  1. [28]Steele R.J., Morris R.G. (1999) Delay-dependent impairment of a matching-to-place task with chronic and intrahippocampal infusion of the NMDA-antagonist D-AP5. Hippocampus, 9, 118– 136. 10226773

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Authors
Till, S. M., Asiminas, A., Jackson, A. D., Katsanevaki, D., Barnes, S. A., Osterweil, E. K., Bear, M. F., Chattarji, S., Wood, E. R., Wyllie, D. J. A., & Kind, P. C.
Affiliations
  • University of Edinburgh (GB)
  • Institute for Stem Cell Biology and Regenerative Medicine (IN)
  • Howard Hughes Medical Institute (US)
  • Tata Institute of Fundamental Research (IN)
Corresponding author
Kind, Peter C.
Venue
Human Molecular Genetics
Published
2015-08-04
Volume
24
Issue
21
Pages
5977-5984
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W1893201598
Cited by
109
References
28
Citations by year
2026: 6 · 2025: 8 · 2024: 7 · 2023: 3 · 2022: 16 · 2021: 9 · 2020: 16 · 2019: 9 · 2018: 13 · 2017: 11 · 2016: 10 · 2015: 1
FWCI
8.02
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Human Molecular Genetics (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, cc-by-nc)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
  • Oxford University Press eBooks
Funders
  • Wellcome Trust (104116, 104116/Z/14/Z)
  • Research Councils UK
  • University of Edinburgh
  • Medical Research Council (MR/K014137/1, MR/M006336/1)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
fragile X syndrome, FMRP, hippocampus, CA1 pyramidal neurons, dendritic spines, protein synthesis, synaptic plasticity, associative recognition memory, episodic-like memory, spatial memory, cross-species conservation, transgenic rats
MeSH terms
Animals, Disease Models, Animal, Female, Fragile X Syndrome, Hippocampus, Male, Memory Disorders, Neuronal Plasticity, Species Specificity, Rats, Sprague-Dawley, Pyramidal Cells, Maze Learning, Rats, Fragile X Mental Retardation Protein, Fragile X Messenger Ribonucleoprotein 1, Gene Knockout Techniques

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