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100 1 _ |a Balduin, Carina
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245 _ _ |a Disruption of ClC-3-mediated 2Cl−/H+ exchange leads to behavioural deficits and thalamic atrophy
260 _ _ |a [London]
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520 _ _ |a CLCN3 encodes ClC-3, an endosomal 2Cl⁻/H⁺ exchanger, with pathogenic variants causing aneurodevelopmental condition marked by developmental delays, intellectual disability, seizures,hyperactivity, anxiety, and brain and retinal abnormalities. Clcn3−/− mice show hippocampal and retinaldegeneration, recapitulating key symptoms observed in humans. ClC-3 forms homodimers (ClC-3/ClC-3) and heterodimers with ClC-4 (ClC-3/ClC-4), with overlapping brain expression. This suggestsdistinct functional roles for homo- and heterodimeric assemblies and raises the question of which brainregions specifically depend on ClC-3/ClC-3 rather than ClC-3/ClC-4 complexes. Using ex vivo PET traceranalyses, Clcn3−/− and Clcn3td/td mice, we found neurodegeneration in the hippocampus and thalamusof Clcn3−/−, while Clcn3td/td mice showed thalamic degeneration and altered neuronal excitability,including changes in action potential threshold and after hyperpolarization. Clcn3td/td mice carryinga transport-deficient p.E281Q ClC-3 variant that still associates with ClC-4, thereby allowing ClC-4 tobe sorted to endosomes as ClC-4/ClC-3 heterodimers, unlike in the Clcn3−/− model. Clcn3td/td mice alsoexhibited reduced weight, hyperactivity, and motor deficits, reflecting clinical features. Lower ClC-4levels in thalamus predict a predominant thalamic expression of ClC-3/ClC-3 homodimers. Overall,our findings indicate a region-specific function of ClC-3/ClC-3 homodimeric complexes and highlightthe importance of ClC-3 transport activity in thalamic neuron survival, with electrophysiologicaldysfunction likely contributing to neurodegeneration.
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700 1 _ |a Qi, Guanxiao
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700 1 _ |a Schöneck, Michael
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700 1 _ |a Trinkel, Verena
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700 1 _ |a Schemmert, Sarah
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700 1 _ |a Guzman, Gustavo A.
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700 1 _ |a Bungert-Plümke, Stefanie
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700 1 _ |a Klüssendorf, Malte
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700 1 _ |a Neumaier, Bernd
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700 1 _ |a Feldmeyer, Dirk
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700 1 _ |a Shah, N. Jon
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700 1 _ |a Stauber, Tobias
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700 1 _ |a Langen, Karl-Josef
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700 1 _ |a Guzman, Raul E.
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700 1 _ |a Willuweit, Antje
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773 _ _ |a 10.1038/s41598-025-19757-2
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