Many people affected by fragile X syndrome(FXS)and autism spectrum disorders have sensory processing deficits,such as hypersensitivity to auditory,tactile,and visual stimuli.Like FXS in humans,loss of Fmr1 in rodents also cause sensory,behavioral,and cognitive deficits.However,the neural mechanisms underlying sensory impairment,especially vision impairment,remain unclear.It remains elusive whether the visual processing deficits originate from corrupted inputs,impaired perception in the primary sensory cortex,or altered integration in the higher cortex,and there is no effective treatment.In this study,we used a genetic knockout mouse model(Fmr1KO),in vivo imaging,and behavioral measurements to show that the loss of Fmr1 impaired signal processing in the primary visual cortex(V1).Specifically,Fmr1KO mice showed enhanced responses to low-intensity stimuli but normal responses to high-intensity stimuli.This abnormality was accom-panied by enhancements in local network connectivity in V1 microcircuits and increased dendritic complexity of V1 neurons.These effects were ameliorated by the acute application of GABAA receptor activators,which enhanced the activity of inhibitory neurons,or by rein-troducing Fmr1 gene expression in knockout V1 neu-rons in both juvenile and young-adult mice.Overall,V1 plays an important role in the visual abnormalities of Fmr1KO mice and it could be possible to rescue the sensory disturbances in developed FXS and autism patients.

State Key Laboratory of Membrane Biology,PKU-IDG/McGovem Institute for Brain Research,School of Life Sciences,Peking University,Beijing 100871,China;School of Basic Medical Sciences,Beijing Key Laboratory of Neural Regeneration and Repair,Capital Medical University,Beijing 100069,China;Peking-Tsinghua Center for Life Sciences,Academy for Advanced Interdisciplinary Studies,Peking University,Beijing 100871,China;School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China;School of Life Sciences,Tsinghua University,Beijing 100084,China;Britton Chance Center for Biomedical Photonics,Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology,Wuhan 430074,China;State Key Laboratory of Brain and Cognitive Sciences,Institute of Biophysics,Chinese Academy of Sciences(CAS),Beijing 100101,China;Institute of Laboratory Animal Science,Peking Union Medical College/Chinese Academy of Medical Science,Beijing 100021,China;Laboratory Animal Center,Fujian University of Tradition Chinese Medicine,Fuzhou 350122,China;State Key Laboratory of Virology,CAS Center for Excellence in Brain Science and,Intelligence Technology,Wuhan Institute of Virology,CAS,Wuhan 430071,China;Center for Brain Science,Key Laboratory of Magnetic Resonance in Biological Systems and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics,CAS,Center for Excellence in Brain Science and Intelligence Technology,Chinese Academy of Sciences,Wuhan 430071,China;Department of Physiology,Anhui Medical University,Hefei 230032,China;Department of Physiology,Institute of Neuroscience and Collaborative Innovation Center for Brain Science,School of Medicine,Zhejiang University,Hangzhou 310058,China

[1]Chaojuan Yang;Yonglu Tian;Feng Su;Yangzhen Wang;Mengna Liu;Hongyi Wang;Yaxuan Cui;Peijiang Yuan;Xiangning Li;Anan Li;Hui Gong;Qingming Luo;Desheng Zhu;Peng Cao;Yunbo Liu;Xunli Wang;Min-hua Luo;Fuqiang Xu;Wei Xiong;Liecheng Wang;Xiang-yao Li;Chen Zhang-.Restoration of FMRP expression in adult V1 neurons rescues visual deficits in a mouse model of fragile X syndrome)[J].蛋白质与细胞,2022(03):203-219

FMRP,Fmr1KO,microcircuits

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