Investigating the neuronal role of the proteasomal ATPase subunit gene PSMC5 in neurodevelopmental proteasomopathies

Authors

Sébastien Küry, Janelle E Stanton, Geeske M van Woerden, Amélie Bosc-Rosati, Tzung-Chien Hsieh, Lise Bray, Marielle Oloudé, Cory Rosenfelt, Marie Pier Scott-Boyer, Victoria Most, Tianyun Wang, Jonas J Papendorf, Charlotte de Konink, Wallid Deb, Virginie Vignard, Maja Studencka-Turski, Thomas Besnard, Anna M Hajdukowicz, Franziska G Thiel, Sophie Wolfgramm, Laëtitia Florenceau, Silvestre Cuinat, Sylvain Marsac, Yann Verrès, Audrey Dangoumau, Léa Poirier, Ingrid M Wentzensen, Annabelle Tuttle, Cara Forster, Johanna Striesow, Richard Golnik, Damara Ortiz, Laura Jenkins, Jill A Rosenfeld, Alban Ziegler, Clara Houdayer, Dominique Bonneau, Erin Torti, Amber Begtrup, Kristin G Monaghan, Sureni V Mullegama, Catharina M L Nienke Volker-Touw, Koen L I van Gassen, Renske Oegema, Mirjam S de Pagter, Katharina Steindl, Anita Rauch, Ivan Ivanovski, Kimberly McDonald, Emily Boothe, Andrew Dauber, Janice Baker, Noelle Andrea V Fabie, Raphael A Bernier, Tychele N Turner, Siddharth Srivastava, Kira A Dies, Lindsay C Swanson, Carrie Costin, Alali Abdulrazak, Rebekah K Jobling, John Pappas, Rachel Rabin, Dmitriy Niyazov, Anne Chun-Hui Tsai, Karen Kovak, David B Beck, May Christine V Malicdan, David R Adams, Lynne Wolfe, Rebecca D Ganetzky, Colleen C Muraresku, Davit Babikyan, Zdeněk Sedláček, Miroslava Hančárová, Andrew T Timberlake, Hind Al Saif, Berkley Nestler, Kayla King, M J Hajianpour, Gregory Costain, D'Arcy Prendergast, Chumei Li, David Geneviève, Antonio Vitobello, Arthur Sorlin, Christophe Philippe, Tamar Harel, Ori Toker, Ataf Sabir, Derek Lim, Mark J Hamilton, Lisa J Bryson, Elaine Cleary, Sacha Weber, Trevor L Hoffman, Anna M Cueto-González, Eduardo F Tizzano, David Gómez-Andrés, Marta Codina-Solà, Athina Ververi, Efterpi Pavlidou, Alexandros Lambropoulos, Kyriakos Garganis, Marlène Rio, Jonathan Levy, Sarah J Langas, Anne M McRae, Mathieu K Lessard, Maria Daniela D'Agostino, Isabelle De Bie, Meret Wegler, Rami Abou Jamra, Susanne B Kamphausen, Viktoria Bothe, Lorraine Potocki, Eric Olinger, Yves Sznajer, Elsa Wiame, Michelle L Thompson, Molly C Schroeder, Catherine Gooch, Raphael A Smith, Arti Pandya, Larissa M Busch, Uwe Völker, Elke Hammer, Kristian Wende, Benjamin Cogné, Bertrand Isidor, Jens Meiler, Clémentine Ripoll, Stéphanie Bigou, Frédéric Laumonnier, Peter W Hildebrand, Evan E Eichler, Kirsty McWalter, Peter M Krawitz, Florence Roux-Dalvai, Ype Elgersma, Julien Marcoux, Marie-Pierre Bousquet, Arnaud Droit, Jeremie Poschmann, Andreas M Grabrucker, Francois V Bolduc, Stéphane Bézieau, Frédéric Ebstein, Elke Krüger

Abstract

Nat Commun. 2025 Nov 26;16(1):10545. doi: 10.1038/s41467-025-65556-8.

ABSTRACT

Neurodevelopmental proteasomopathies are a group of disorders caused by variants in proteasome subunit genes, that disrupt protein homeostasis and brain development through poorly characterized mechanisms. Here, we report 26 distinct variants in PSMC5, encoding the AAA⁺ ATPase subunit PSMC5/RPT6, in individuals with syndromic neurodevelopmental conditions. Combining genetic, multi-omics and biochemical approaches across cellular models and Drosophila, we unveil the essential role of proteasomes in sustaining key cellular processes. Loss of PSMC5/RPT6 function impairs proteasome activity, leading to protein aggregation, disruption of mitochondrial homeostasis, and dysregulation of lipid metabolism and immune signaling. It also compromises synaptic balance, neuritogenesis, and neural progenitor cell stemness, causing deficits in higher-order functions, including learning and locomotion. Pharmacological targeting of integrated stress response kinases reveals a mechanistic link between proteotoxic stress and spontaneous type I interferon activation. These findings expand our understanding of proteasome-dependent quality control in neurodevelopment and suggest potential therapeutic strategies for neurodevelopmental proteasomopathies.

PMID:41298377 | DOI:10.1038/s41467-025-65556-8