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定义脊椎动物视网膜中形态和遗传上不同的GABAergic/cholinergic亚马克林细胞亚型

Yan Li^1,2, Shuguang Yu^1,2, Xinling Jia¹

¹Institute of Neuroscience, State Key Laboratory of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China.

|February 16, 2024

概括

研究人员在斑马鱼中发现了两种新型的视网膜亚马克林细胞,它们在遗传学和功能上有所不同. 这扩大了我们对脊椎动物视网膜视觉处理和细胞多样性的理解.

科学领域:

神经科学是一个神经科学.
视网膜细胞生物学视网膜细胞生物学
脊椎动物的比较解剖学

背景情况:

在哺乳动物中,视网膜方向选择性是由 sox2+ GABAergic/cholinergic 亚马克林细胞 (AC) 介导的.
在其他脊椎动物中,这些AC的细胞多样性在很大程度上是未知的.

研究的目的:

为了研究斑马鱼视网膜中GABAergic/cholinergicACs的细胞多样性和功能.
为了比较斑马鱼的AC与它们的哺乳动物对应物.

主要方法:

基因分析以确定细胞类型 (sox2+,bhlhe22+,bhlhe23+).
形态特征 (树突树木,层状, soma 位置).
在体内进行两光子成像和行为测试以评估视觉功能.

主要成果:

在斑马鱼中确定了两个不同的GABAergic/cholinergicAC类型:一个sox2+类型和一个新的bhlhe22+类型.
基因破坏研究显示,去除每个细胞类型的不同要求 (单独的sox2与bhlhe22/bhlhe23的codisruption).
两种AC类型都表现出方向选择性,但对不同大小的运动刺激有偏好反应.

结论:

斑马鱼在GABAergic/cholinergic亚马克林细胞中具有新的细胞多样性.
这些不同的AC类型通过差异化的刺激尺寸偏好,有助于视觉方向选择性.
这些发现促进了对脊椎动物视网膜电路和视觉处理机制的理解.

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