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Kay Y, Tsan L, Davis EA, Tian C, Décarie-Spain L, Sadybekov A, Pushkin AN, Katritch V, Kanoski SE, Herring BE. Schizophrenia-associated SAP97 mutations increase glutamatergic synapse strength in the dentate gyrus and impair contextual episodic memory in rats. Nat Commun 2022; 13:798. [PMID: 35145085 PMCID: PMC8831576 DOI: 10.1038/s41467-022-28430-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 01/05/2022] [Indexed: 12/24/2022] Open
Abstract
Mutations in the putative glutamatergic synapse scaffolding protein SAP97 are associated with the development of schizophrenia in humans. However, the role of SAP97 in synaptic regulation is unclear. Here we show that SAP97 is expressed in the dendrites of granule neurons in the dentate gyrus but not in the dendrites of other hippocampal neurons. Schizophrenia-related perturbations of SAP97 did not affect CA1 pyramidal neuron synapse function. Conversely, these perturbations produce dramatic augmentation of glutamatergic neurotransmission in granule neurons that can be attributed to a release of perisynaptic GluA1-containing AMPA receptors into the postsynaptic densities of perforant pathway synapses. Furthermore, inhibiting SAP97 function in the dentate gyrus was sufficient to impair contextual episodic memory. Together, our results identify a cell-type-specific synaptic regulatory mechanism in the dentate gyrus that, when disrupted, impairs contextual information processing in rats. The effects of SAP97 mutations associated with schizophrenia on synaptic function are unclear. Here, the authors show that schizophrenia-related SAP97 mutations enhance glutamatergic synapse strength in the dentate gyrus, impairing contextual episodic memory in rats.
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Affiliation(s)
- Yuni Kay
- Neuroscience Graduate Program, University of Southern California, Los Angeles, CA, 90089, USA
| | - Linda Tsan
- Neuroscience Graduate Program, University of Southern California, Los Angeles, CA, 90089, USA
| | - Elizabeth A Davis
- Department of Biological Sciences, Human and Evolutionary Biology Section, Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, CA, 90089, USA
| | - Chen Tian
- Neuroscience Graduate Program, University of Southern California, Los Angeles, CA, 90089, USA
| | - Léa Décarie-Spain
- Department of Biological Sciences, Human and Evolutionary Biology Section, Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, CA, 90089, USA
| | - Anastasiia Sadybekov
- Department of Chemistry, University of Southern California, Los Angeles, CA, 90089, USA
| | - Anna N Pushkin
- Neuroscience Graduate Program, University of Southern California, Los Angeles, CA, 90089, USA
| | - Vsevolod Katritch
- Department of Chemistry, University of Southern California, Los Angeles, CA, 90089, USA.,Quantitative and Computational Biology, University of Southern California, Los Angeles, CA, 90089, USA
| | - Scott E Kanoski
- Neuroscience Graduate Program, University of Southern California, Los Angeles, CA, 90089, USA.,Department of Biological Sciences, Human and Evolutionary Biology Section, Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, CA, 90089, USA
| | - Bruce E Herring
- Neuroscience Graduate Program, University of Southern California, Los Angeles, CA, 90089, USA. .,Department of Biological Sciences, Neurobiology Section, Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, CA, 90089, USA.
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