992-嗅觉系统的空间转录组密码与受体图谱构建 episode artwork

EPISODE · May 18, 2026 · 21 MIN

992-嗅觉系统的空间转录组密码与受体图谱构建

from 聊聊Sci

这份研究资料揭示了小鼠嗅觉系统中的一种空间编码机制,挑战了以往认为嗅觉受体选择是随机的传统观点。研究发现,鼻腔内约1,100种嗅觉受体并非杂乱分布,而是根据其在嗅觉上皮中的背腹侧位置,形成了高度精确且可重复的空间地图。这种空间特性由包含约250个基因的转录程序驱动,并受到视黄酸(RA)信号梯度的严密调控。在受体被正式选择之前,嗅觉感觉神经元的前体细胞就已经具备了这种空间身份。该机制确保了鼻腔内的受体分布与大脑嗅球中的轴突靶向目标保持一致,从而实现了感知地图的精准对接。这种连续变化的转录代码不仅解释了嗅觉受体的选择逻辑,也揭示了嗅觉系统如何通过空间布局来组织复杂的嗅觉信息。References:Brann D H, Tsukahara T, Tau C, et al. A spatial code governs olfactory receptor choice and aligns sensory maps in the nose and brain[J]. Cell, 2026.前往小宇宙评论区与主播互动

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992-嗅觉系统的空间转录组密码与受体图谱构建

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