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Rapid Acceleration of Diagnostics - Underserved Populations (RADx-UP): Scaling Up SARS-COV-2 Testing to Serve Latinx Communities

ABSTRACT: Rapid Acceleration of Diagnostics - Underserved Populations (RADx-UP): Scaling Up SARS-COV-2 Testing to Serve Latinx Communities

PROVIDER: PRJNA759661 | ENA |

REPOSITORIES: ENA

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Rapid Acceleration of Diagnostics - Underserved Populations (RADx-UP): Scaling Up SARS-COV-2 Testing to Serve Latinx Communities

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A Bidirectional Switch in the Shank3 Phosphorylation State Is Necessary to Enable Synaptic Scaling Up and Down

Project description:Wu C, Tatavarty V, Jean-Beltran PM, Guerrero A, Keshishian H, Krug K, MacMullan M, de Arce KP, Carr SA, Cottrell J, Turrigiano GG. 2021 Homeostatic synaptic plasticity requires widespread remodeling of synaptic signaling and scaffolding networks, but the role of posttranslational modifications in this process has not been systematically studied. Here we analyzed changes in the phosphoproteome during synaptic scaling up and down and found wide-spread and temporally complex changes. These included 424 bidirectionally modulated phosphosites that were strongly enrichment for synapse-associated proteins, including the ASD-associated synaptic scaffold protein Shank3. Shank3 was dephosphorylated at two highly conserved sites (rat S1586 and S1615) during scaling up, and hyperphosphorylated during scaling down. These changes modified the synaptic localization of Shank3 during scaling, and phosphomimetic or deficient mutants of Shank3 prevented scaling up or down, respectively. Finally, we found that dephosphorylation of these sites via PP2A activity was essential for the maintenance of synaptic scaling up. Thus Shank3 undergoes an activity-dependent switch between hypo- and hyperphosphorylation at S1586/ S1615, that is necessary to enable scaling up or down, respectively. More broadly, our data suggest that widespread and bidirectional changes in the synaptic phosphoproteome are essential for the functional reconfiguration of synaptic scaffolds during homeostatic plasticity.

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