Serines 13 and 16 are critical determinants of full-length human mutant huntingtin induced disease pathogenesis in HD mice.
Serines 13 and 16 are critical determinants of full-length human mutant huntingtin induced disease pathogenesis in HD mice.
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DOI:
10.1016/j.neuron.2009.11.020
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发表时间:
2009-12-24
期刊:
影响因子:
16.2
通讯作者:
Yang, X. William
中科院分区:
文献类型:
--
作者:
Gu, Xiaofeng;Greiner, Erin R.;Mishra, Rakesh;Kodali, Ravindra;Osmand, Alex;Finkbeiner, Steven;Steffan, Joan S.;Thompson, Leslie Michels;Wetzel, Ronald;Yang, X. William
The N-terminal 17-amino-acids of huntingtin (NT17) can be phosphorylated on serines 13 and 16; however, the significance of these modifications in Huntington’s disease pathogenesis remains unknown. In this study, we developed BAC transgenic mice expressing full-length mutant huntingtin (fl-mhtt) with serines 13 and 16 mutated to either aspartate (phosphomimetic or SD) or alanine (phosphoresistant or SA). Both mutant proteins preserve the essential function of huntingtin in rescuing knockout mouse phenotypes. However, fl-mhtt induced disease pathogenesis, including motor and psychiatric-like behavioral deficits, mhtt aggregation and selective neurodegeneration are abolished in SD but preserved in SA mice. Moreover, modification of these serines in expanded repeat huntingtin peptides modulates aggregation and amyloid fibril formation in vitro. Together, our findings demonstrate that serines 13 and 16 are critical determinants of fl-mhtt-induced disease pathogenesis in vivo, supporting the targeting of huntingtin NT17 domain and its modifications in HD therapy.
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