The ataxin-1 interactome reveals direct connection with multiple disrupted nuclear transport pathways.

Sunyuan Zhang, Nicholas A Williamson, Lisa Duvick, Alexander Lee, Harry T Orr, Austin Korlin-Downs, Praseuth Yang, Yee-Foong Mok, David A Jans, Marie A Bogoyevitch

Nature communications 2020 Jul 03

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The expanded polyglutamine (polyQ) tract form of ataxin-1 drives disease progression in spinocerebellar ataxia type 1 (SCA1). Although known to form distinctive intranuclear bodies, the cellular pathways and processes that polyQ-ataxin-1 influences remain poorly understood. Here we identify the direct and proximal partners constituting the interactome of ataxin-1[85Q] in Neuro-2a cells, pathways analyses indicating a significant enrichment of essential nuclear transporters, pointing to disruptions in nuclear transport processes in the presence of elevated levels of ataxin-1. Our direct assessments of nuclear transporters and their cargoes confirm these observations, revealing disrupted trafficking often with relocalisation of transporters and/or cargoes to ataxin-1[85Q] nuclear bodies. Analogous changes in importin-β1, nucleoporin 98 and nucleoporin 62 nuclear rim staining are observed in Purkinje cells of ATXN1[82Q] mice. The results highlight a disruption of multiple essential nuclear protein trafficking pathways by polyQ-ataxin-1, a key contribution to furthering understanding of pathogenic mechanisms initiated by polyQ tract proteins.

Citation

Sunyuan Zhang, Nicholas A Williamson, Lisa Duvick, Alexander Lee, Harry T Orr, Austin Korlin-Downs, Praseuth Yang, Yee-Foong Mok, David A Jans, Marie A Bogoyevitch. The ataxin-1 interactome reveals direct connection with multiple disrupted nuclear transport pathways. Nature communications. 2020 Jul 03;11(1):3343