Partial loss of Tip60 slows mid-stage neurodegeneration in a spinocerebellar ataxia type 1 (SCA1) mouse model.

Partial loss of Tip60 slows mid-stage neurodegeneration in a spinocerebellar ataxia type 1 (SCA1) mouse model.
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DOI:
10.1093/hmg/ddr108
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发表时间:
2011-06-01
影响因子:
3.5
通讯作者:
Orr HT
Orr HT
中科院分区:
生物学2区
文献类型:
--
作者:
Gehrking KM;Andresen JM;Duvick L;Lough J;Zoghbi HY;Orr HT

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脊髓小脑性共济失调1型(SCA 1)是由多聚谷氨酰胺束扩张引起的9种显性遗传性神经退行性疾病之一。在SCA 1中,扩展的多聚谷氨酰胺束位于共济失调蛋白-1(ATXN 1)蛋白中。ATXN 1是维甲酸受体相关孤儿受体α(Rora)和乙酰转移酶tat相互作用蛋白60 kDa(Tip 60)体内复合物的一部分。ATXN 1和Tip 60通过ATXN 1和ATXN 1的HMG盒蛋白1(AXH)结构域直接相互作用。此外,在位置776处的磷酸模拟Asp氨基酸,先前显示增强发病机制,增加ATXN 1与Tip 60相互作用的能力。使用遗传学方法,通过将ATXN 1 [82 Q]小鼠与Tip 60 +/−动物杂交来评估ATXN 1/Tip 60相互作用的生物学相关性。Tip 60的部分缺失增加了Rora和Rora介导的基因表达,并延迟了疾病进展中期ATXN 1介导的小脑变性。这些结果表明Tip 60在疾病进展期间具有特定的时间作用。我们还表明,遗传背景调节ATXN 1 [82 Q]诱导的表型。有趣的是,这些后面的研究表明,一些表型在混合背景下增强,而另一些则被抑制。
Spinocerebellar ataxia type 1 (SCA1) is one of nine dominantly inherited neurodegenerative diseases caused by polyglutamine tract expansion. In SCA1, the expanded polyglutamine tract is in the ataxin-1 (ATXN1) protein. ATXN1 is part of an in vivo complex with retinoid acid receptor-related orphan receptor alpha (Rora) and the acetyltransferase tat-interactive protein 60 kDa (Tip60). ATXN1 and Tip60 interact directly via the ATXN1 and HMG-box protein 1 (AXH) domain of ATXN1. Moreover, the phospho-mimicking Asp amino acid at position 776, previously shown to enhance pathogenesis, increases the ability of ATXN1 to interact with Tip60. Using a genetic approach, the biological relevance of the ATXN1/Tip60 interaction was assessed by crossing ATXN1[82Q] mice with Tip60+/−animals. Partial Tip60 loss increased Rora and Rora-mediated gene expression and delayed ATXN1[82]-mediated cerebellar degeneration during mid-stage disease progression. These results suggested a specific, temporal role for Tip60 during disease progression. We also showed that genetic background modulated ATXN1[82Q]-induced phenotypes. Of interest, these latter studies showed that some phenotypes are enhanced on a mixed background while others are suppressed.
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