Deficits in tactile learning in a mouse model of fragile X syndrome.

Deficits in tactile learning in a mouse model of fragile X syndrome.
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易碎X综合征的鼠标模型中的触觉学习缺陷。

DOI:
10.1371/journal.pone.0109116
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
McGee AW
McGee AW
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Arnett MT;Herman DH;McGee AW

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脆性X智力低下1突变小鼠(Fmr1 KO)重现了与脆性X综合征(FXS)相关的几种神经功能缺损。由于触觉超敏反应是FXS的一个标志,我们研究了单个胡须在Fmr1 KO和野生型(WT)小鼠的体感桶皮层的感觉表征,并比较了它们在胡须依赖性学习范式,差距交叉试验中的表现。Fmr1 KO小鼠表现出升高的反应,刺激个别胡须的内在信号的光学成像测量。在差距交叉任务中,Fmr 1 KO小鼠的初始表现与WT对照没有区别。然而,虽然WT小鼠在所有间隙距离的经验显着改善,但Fmr1 KO小鼠在更长距离的改善中表现出显着和特定的缺陷,这仅仅依赖于来自胡须的触觉信息。因此,Fmr1基因敲除小鼠对感觉输入的皮层反应发生了改变,这与触觉学习的缺陷有关。
The fragile X mental retardation 1 mutant mouse (Fmr1 KO) recapitulates several of the neurologic deficits associated with Fragile X syndrome (FXS). As tactile hypersensitivity is a hallmark of FXS, we examined the sensory representation of individual whiskers in somatosensory barrel cortex of Fmr1 KO and wild-type (WT) mice and compared their performance in a whisker-dependent learning paradigm, the gap cross assay. Fmr1 KO mice exhibited elevated responses to stimulation of individual whiskers as measured by optical imaging of intrinsic signals. In the gap cross task, initial performance of Fmr1 KO mice was indistinguishable from WT controls. However, while WT mice improved significantly with experience at all gap distances, Fmr1 KO mice displayed significant and specific deficits in improvement at longer distances which rely solely on tactile information from whiskers. Thus, Fmr1 KO mice possess altered cortical responses to sensory input that correlates with a deficit in tactile learning.
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