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Developmental regulation of olfactory circuit formation in mice.
Development, Growth & Differentiation ( IF 2.5 ) Pub Date : 2020-02-28 , DOI: 10.1111/dgd.12657
Hitoshi Sakano 1
Affiliation  

In mammals, odorants induce various behavioral responses that are critical to the survival of the individual and species. Binding signals of odorants to odorant receptors (ORs) expressed in the olfactory epithelia are converted to an odor map, a pattern of activated glomeruli, in the olfactory bulb (OB). This topographic map is used to identify odorants for memory-based learned decisions. In the embryo, a coarse olfactory map is generated in the OB by a combination of dorsal-ventral and anterior-posterior targeting of olfactory sensory neurons (OSNs), using specific sets of axon-guidance molecules. During the process of OSN projection, odor signals are sorted into distinct odor qualities in separate functional domains in the OB. Odor information is then conveyed by the projection neurons, mitral/tufted cells, to various regions in the olfactory cortex, particularly to the amygdala for innate olfactory decisions. Although the basic architecture of hard-wired circuits is generated by a genetic program, innate olfactory responses are modified by neonatal odor experience in an activity-dependent manner. Stimulus-driven OR activity promotes post-synaptic events and dendrite selection in the responding glomeruli making them larger. As a result, enhanced odor inputs in neonates establish imprinted olfactory memory that induces attractive responses in adults, even when the odor quality is innately aversive. In this paper, I will provide an overview of the recent progress made in the olfactory circuit formation in mice.

中文翻译:

小鼠嗅觉回路形成的发育调控。

在哺乳动物中,加味剂会诱发各种行为反应,这对于个体和物种的生存至关重要。在嗅球(OB)中,嗅觉上皮中表达的气味剂与气味受体(OR)的结合信号被转换为气味图,即激活的肾小球模式。该地形图用于识别气味,以基于记忆的学习决策。在胚胎中,使用特定组的轴突引导分子,通过嗅觉感觉神经元(OSNs)的背腹侧和前后定向的结合,在OB中生成粗略的嗅觉图。在OSN投影过程中,气味信号在OB的单独功能域中被分类为不同的气味质量。然后,气味信息由投射神经元,二尖瓣/簇状细胞传递,嗅觉皮层的各个区域,特别是杏仁核的先天嗅觉决定。尽管硬连线电路的基本体系结构是由遗传程序生成的,但先天性嗅觉反应是通过新生儿气味体验以活动依赖的方式进行修改的。刺激驱动的OR活动促进突触后事件和响应性肾小球中的树突选择,使它们变大。结果,即使气味质量天生令人厌恶,新生儿增加的气味输入也会建立烙印的嗅觉记忆,从而引起成年人的吸引力反应。在本文中,我将概述小鼠嗅觉回路形成的最新进展。尽管硬连线电路的基本体系结构是由遗传程序生成的,但先天性嗅觉反应是通过新生儿气味体验以活动依赖的方式进行修改的。刺激驱动的OR活动促进突触后事件和响应性肾小球中的树突选择,使它们变大。结果,即使气味质量天生令人厌恶,新生儿增加的气味输入也会建立烙印的嗅觉记忆,从而引起成年人的吸引力反应。在本文中,我将概述小鼠嗅觉回路形成的最新进展。尽管硬连线电路的基本体系结构是由遗传程序生成的,但先天性嗅觉反应是通过新生儿气味体验以活动依赖的方式进行修改的。刺激驱动的OR活动促进突触后事件和响应性肾小球中的树突选择,使它们变大。结果,即使气味质量天生令人厌恶,新生儿增加的气味输入也会建立烙印的嗅觉记忆,从而引起成年人的吸引力反应。在本文中,我将概述小鼠嗅觉回路形成的最新进展。结果,即使气味质量天生令人厌恶,新生儿增加的气味输入也会建立烙印的嗅觉记忆,从而引起成年人的吸引力反应。在本文中,我将概述小鼠嗅觉回路形成的最新进展。结果,即使气味质量天生令人厌恶,新生儿增加的气味输入也会建立烙印的嗅觉记忆,从而引起成年人的吸引力反应。在本文中,我将概述小鼠嗅觉回路形成的最新进展。
更新日期:2020-02-28
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