Centre d'Information et de documentation du CRA Rhône-Alpes
CRA
Informations pratiques
-
Adresse
Centre d'information et de documentation
du CRA Rhône-Alpes
Centre Hospitalier le Vinatier
bât 211
95, Bd Pinel
69678 Bron CedexHoraires
Lundi au Vendredi
9h00-12h00 13h30-16h00Contact
Tél: +33(0)4 37 91 54 65
Mail
Fax: +33(0)4 37 91 54 37
-
Détail de l'auteur
Auteur Zrinko KOZIC |
Documents disponibles écrits par cet auteur (1)
Faire une suggestion Affiner la recherche
Experience-dependent changes in hippocampal spatial activity and hippocampal circuit function are disrupted in a rat model of Fragile X Syndrome / Antonis ASIMINAS in Molecular Autism, 13 (2022)
[article]
Titre : Experience-dependent changes in hippocampal spatial activity and hippocampal circuit function are disrupted in a rat model of Fragile X Syndrome Type de document : Texte imprimé et/ou numérique Auteurs : Antonis ASIMINAS, Auteur ; Sam A. BOOKER, Auteur ; Owen R. DANDO, Auteur ; Zrinko KOZIC, Auteur ; Daisy ARKELL, Auteur ; Felicity H. INKPEN, Auteur ; Anna SUMERA, Auteur ; Irem AKYEL, Auteur ; Peter C. KIND, Auteur ; Emma R. WOOD, Auteur Article en page(s) : 49 p. Langues : Anglais (eng) Mots-clés : Mice Rats Animals Fragile X Syndrome/genetics Intellectual Disability Autism Spectrum Disorder Mice, Knockout Hippocampus/metabolism Fragile X Mental Retardation Protein/genetics Disease Models, Animal Index. décimale : PER Périodiques Résumé : BACKGROUND: Fragile X syndrome (FXS) is a common single gene cause of intellectual disability and autism spectrum disorder. Cognitive inflexibility is one of the hallmarks of FXS with affected individuals showing extreme difficulty adapting to novel or complex situations. To explore the neural correlates of this cognitive inflexibility, we used a rat model of FXS (Fmr1(-/y)). METHODS: We recorded from the CA1 in Fmr1(-/y) and WT littermates over six 10-min exploration sessions in a novel environment-three sessions per day (ITI 10Â min). Our recordings yielded 288 and 246 putative pyramidal cells from 7 WT and 7 Fmr1(-/y) rats, respectively. RESULTS: On the first day of exploration of a novel environment, the firing rate and spatial tuning of CA1 pyramidal neurons was similar between wild-type (WT) and Fmr1(-/y) rats. However, while CA1 pyramidal neurons from WT rats showed experience-dependent changes in firing and spatial tuning between the first and second day of exposure to the environment, these changes were decreased or absent in CA1 neurons of Fmr1(-/y) rats. These findings were consistent with increased excitability of Fmr1(-/y) CA1 neurons in ex vivo hippocampal slices, which correlated with reduced synaptic inputs from the medial entorhinal cortex. Lastly, activity patterns of CA1 pyramidal neurons were dis-coordinated with respect to hippocampal oscillatory activity in Fmr1(-/y) rats. LIMITATIONS: It is still unclear how the observed circuit function abnormalities give rise to behavioural deficits in Fmr1(-/y) rats. Future experiments will focus on this connection as well as the contribution of other neuronal cell types in the hippocampal circuit pathophysiology associated with the loss of FMRP. It would also be interesting to see if hippocampal circuit deficits converge with those seen in other rodent models of intellectual disability. CONCLUSIONS: In conclusion, we found that hippocampal place cells from Fmr1(-/y) rats show similar spatial firing properties as those from WT rats but do not show the same experience-dependent increase in spatial specificity or the experience-dependent changes in network coordination. Our findings offer support to a network-level origin of cognitive deficits in FXS. En ligne : http://dx.doi.org/10.1186/s13229-022-00528-z Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=491
in Molecular Autism > 13 (2022) . - 49 p.[article] Experience-dependent changes in hippocampal spatial activity and hippocampal circuit function are disrupted in a rat model of Fragile X Syndrome [Texte imprimé et/ou numérique] / Antonis ASIMINAS, Auteur ; Sam A. BOOKER, Auteur ; Owen R. DANDO, Auteur ; Zrinko KOZIC, Auteur ; Daisy ARKELL, Auteur ; Felicity H. INKPEN, Auteur ; Anna SUMERA, Auteur ; Irem AKYEL, Auteur ; Peter C. KIND, Auteur ; Emma R. WOOD, Auteur . - 49 p.
Langues : Anglais (eng)
in Molecular Autism > 13 (2022) . - 49 p.
Mots-clés : Mice Rats Animals Fragile X Syndrome/genetics Intellectual Disability Autism Spectrum Disorder Mice, Knockout Hippocampus/metabolism Fragile X Mental Retardation Protein/genetics Disease Models, Animal Index. décimale : PER Périodiques Résumé : BACKGROUND: Fragile X syndrome (FXS) is a common single gene cause of intellectual disability and autism spectrum disorder. Cognitive inflexibility is one of the hallmarks of FXS with affected individuals showing extreme difficulty adapting to novel or complex situations. To explore the neural correlates of this cognitive inflexibility, we used a rat model of FXS (Fmr1(-/y)). METHODS: We recorded from the CA1 in Fmr1(-/y) and WT littermates over six 10-min exploration sessions in a novel environment-three sessions per day (ITI 10Â min). Our recordings yielded 288 and 246 putative pyramidal cells from 7 WT and 7 Fmr1(-/y) rats, respectively. RESULTS: On the first day of exploration of a novel environment, the firing rate and spatial tuning of CA1 pyramidal neurons was similar between wild-type (WT) and Fmr1(-/y) rats. However, while CA1 pyramidal neurons from WT rats showed experience-dependent changes in firing and spatial tuning between the first and second day of exposure to the environment, these changes were decreased or absent in CA1 neurons of Fmr1(-/y) rats. These findings were consistent with increased excitability of Fmr1(-/y) CA1 neurons in ex vivo hippocampal slices, which correlated with reduced synaptic inputs from the medial entorhinal cortex. Lastly, activity patterns of CA1 pyramidal neurons were dis-coordinated with respect to hippocampal oscillatory activity in Fmr1(-/y) rats. LIMITATIONS: It is still unclear how the observed circuit function abnormalities give rise to behavioural deficits in Fmr1(-/y) rats. Future experiments will focus on this connection as well as the contribution of other neuronal cell types in the hippocampal circuit pathophysiology associated with the loss of FMRP. It would also be interesting to see if hippocampal circuit deficits converge with those seen in other rodent models of intellectual disability. CONCLUSIONS: In conclusion, we found that hippocampal place cells from Fmr1(-/y) rats show similar spatial firing properties as those from WT rats but do not show the same experience-dependent increase in spatial specificity or the experience-dependent changes in network coordination. Our findings offer support to a network-level origin of cognitive deficits in FXS. En ligne : http://dx.doi.org/10.1186/s13229-022-00528-z Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=491