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TitleProtein Kinase A Deregulation in the Medial Prefrontal Cortex Impairs Working Memory in Murine Oligophrenin-1 Deficiency
AuthorChun-Lei Zhang, Mattia Aime, Emilie Laheranne, Xander Houbaert, Hajer El Oussini, Christelle Martin, Marilyn Lepleux, Elisabeth Normand, Jamel Chelly, Etienne Herzog, Pierre Billuart and Yann Humeau
Affiliation(s)Centre National de la Recherche Scientifique, Université Paris Descartes, Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche 8104, Institut Cochin, 75014 Paris, France
PublishedJournal of Neuroscience 15 November 2017, 37 (46) 11114-11126; DOI: https://doi.org/10.1523/JNEUROSCI.0351-17.2017
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AbstractClassical and systems genetics have identified wide networks of genes associated with cognitive and neurodevelopmental diseases. In parallel to deciphering the role of each of these genes in neuronal or synaptic function, evaluating the response of neuronal and molecular networks to gene loss of function could reveal some pathophysiological mechanisms potentially accessible to nongenetic therapies. Loss of function of the Rho-GAP oligophrenin-1 is associated with cognitive impairments in both human and mouse. Upregulation of both PKA and ROCK has been reported in Ophn1−/y mice, but it remains unclear whether kinase hyperactivity contributes to the behavioral phenotypes. In this study, we thoroughly characterized a prominent perseveration phenotype displayed by Ophn1-deficient mice using a Y-maze spatial working memory (SWM) test. We report that Ophn1 deficiency in the mouse generated severe cognitive impairments, characterized by both a high occurrence of perseverative behaviors and a lack of deliberation during the SWM test. In vivo and in vitro pharmacological experiments suggest that PKA dysregulation in the mPFC underlies cognitive dysfunction in Ophn1-deficient mice, as assessed using a delayed spatial alternation task results. Functionally, mPFC neuronal networks appeared to be affected in a PKA-dependent manner, whereas hippocampal-PFC projections involved in SWM were not affected in Ophn1−/y mice. Thus, we propose that discrete gene mutations in intellectual disability might generate “secondary” pathophysiological mechanisms, which are prone to become pharmacological targets for curative strategies in adult patients.

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