ATAXIN-1 Interacts with the Repressor Capicua in Its Native Complex to Cause SCA1 Neuropathology

Yung C. Lam, Aaron B. Bowman, Paymaan Jafar-Nejad, Janghoo Lim, Ronald Richman, John D. Fryer, Eric D. Hyun, Lisa A. Duvick, Harry T. Orr, Juan Botas, Huda Y. Zoghbi

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Abstract

Spinocerebellar ataxia type 1 (SCA1) is one of several neurodegenerative diseases caused by expansion of a polyglutamine tract in the disease protein, in this case, ATAXIN-1 (ATXN1). A key question in the field is whether neurotoxicity is mediated by aberrant, novel interactions with the expanded protein or whether its wild-type functions are augmented to a deleterious degree. We examined soluble protein complexes from mouse cerebellum and found that the majority of wild-type and expanded ATXN1 assembles into large stable complexes containing the transcriptional repressor Capicua. ATXN1 directly binds Capicua and modulates Capicua repressor activity in Drosophila and mammalian cells, and its loss decreases the steady-state level of Capicua. Interestingly, the S776A mutation, which abrogates the neurotoxicity of expanded ATXN1, substantially reduces the association of mutant ATXN1 with Capicua in vivo. These data provide insight into the function of ATXN1 and suggest that SCA1 neuropathology depends on native, not novel, protein interactions.

Original languageEnglish (US)
Pages (from-to)1335-1347
Number of pages13
JournalCell
Volume127
Issue number7
DOIs
StatePublished - Dec 29 2006

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    Lam, Y. C., Bowman, A. B., Jafar-Nejad, P., Lim, J., Richman, R., Fryer, J. D., Hyun, E. D., Duvick, L. A., Orr, H. T., Botas, J., & Zoghbi, H. Y. (2006). ATAXIN-1 Interacts with the Repressor Capicua in Its Native Complex to Cause SCA1 Neuropathology. Cell, 127(7), 1335-1347. https://doi.org/10.1016/j.cell.2006.11.038