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Horigane SI, Ozawa Y, Zhang J, Todoroki H, Miao P, Haijima A, Yanagawa Y, Ueda S, Nakamura S, Kakeyama M, Takemoto-Kimura S. A mouse model of Timothy syndrome exhibits altered social competitive dominance and inhibitory neuron development. FEBS Open Bio 2020; 10:1436-1446. [PMID: 32598571 PMCID: PMC7396430 DOI: 10.1002/2211-5463.12924] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 06/13/2020] [Accepted: 06/25/2020] [Indexed: 01/17/2023] Open
Abstract
Multiple genetic factors related to autism spectrum disorder (ASD) have been identified, but the biological mechanisms remain obscure. Timothy syndrome (TS), associated with syndromic ASD, is caused by a gain-of-function mutation, G406R, in the pore-forming subunit of L-type Ca2+ channels, Cav 1.2. In this study, a mouse model of TS, TS2-neo, was used to enhance behavioral phenotyping and to identify developmental anomalies in inhibitory neurons. Using the IntelliCage, which enables sequential behavioral tasks without human handling and mouse isolation stress, high social competitive dominance was observed in TS2-neo mice. Furthermore, histological analysis demonstrated inhibitory neuronal abnormalities in the neocortex, including an excess of smaller-sized inhibitory presynaptic terminals in the somatosensory cortex of young adolescent mice and higher numbers of migrating inhibitory neurons from the medial ganglionic eminence during embryonic development. In contrast, no obvious changes in excitatory synaptic terminals were found. These novel neural abnormalities in inhibitory neurons of TS2-neo mice may result in a disturbed excitatory/inhibitory (E/I) balance, a key feature underlying ASD.
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Affiliation(s)
- Shin-Ichiro Horigane
- Department of Neuroscience I, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Molecular/Cellular Neuroscience, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yukihiro Ozawa
- Department of Neuroscience I, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Molecular/Cellular Neuroscience, Nagoya University Graduate School of Medicine, Nagoya, Japan.,Department of Pathology and Laboratory Medicine, Nagoya University Hospital, Nagoya, Japan
| | - Jun Zhang
- Department of Neuroscience I, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Molecular/Cellular Neuroscience, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Hiroe Todoroki
- Laboratory for Systems Neurosciences and Preventive Medicine, Faculty of Human Sciences, Waseda University, Tokorozawa, Japan
| | - Pan Miao
- Department of Neuroscience I, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Molecular/Cellular Neuroscience, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Asahi Haijima
- Laboratory for Systems Neurosciences and Preventive Medicine, Faculty of Human Sciences, Waseda University, Tokorozawa, Japan.,Research Institute for Environmental Medical Sciences, Waseda University, Tokorozawa, Japan
| | - Yuchio Yanagawa
- Department of Genetic and Behavioral Neuroscience, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Shuhei Ueda
- Department of Neuroscience I, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Molecular/Cellular Neuroscience, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Shigeo Nakamura
- Department of Pathology and Laboratory Medicine, Nagoya University Hospital, Nagoya, Japan
| | - Masaki Kakeyama
- Laboratory for Systems Neurosciences and Preventive Medicine, Faculty of Human Sciences, Waseda University, Tokorozawa, Japan.,Research Institute for Environmental Medical Sciences, Waseda University, Tokorozawa, Japan
| | - Sayaka Takemoto-Kimura
- Department of Neuroscience I, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Molecular/Cellular Neuroscience, Nagoya University Graduate School of Medicine, Nagoya, Japan.,Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency, Saitama, Japan
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