Distribution pattern of floor plate neurons in zebrafish
Received date: 2022-03-17
Revised date: 2022-04-22
Online published: 2022-05-27
Supported by
Supported by the National Natural Science Foundation of China No(31991194)
The floor plate (FP) is a critical signaling center for the development of neural tube and body axis, and is localized at the ventral midline of the neural tube. Multiple types of neurons are present in the floor plate, while the distribution pattern of these neuronal cells remains unclear. By using transgenic zebrafish lines that specifically label different neuronal cells, we investigated the distribution pattern of these neurons in the floor plate region. Our results showed that foxj1a, sox2, clusterin and gfap genes were expressed in the medial floor plate (MFP), consisting of a single row of cells. The cerebrospinal fluid-contacting neurons (CSF-cNs), also named as Kolmer-Agduhr interneurons (KAʼ and KA” neurons), were located on the lateral sides of MFP. The foxj1a and pkd2l1 genes were expressed in the KA” neurons, which were located to the ventral terminal gap of wedge-shaped MFP cells. The neighboring KA” neurons were separated by neurons expressing Gfap, Olig2 or Sox2. In contrast, the KAʼ neurons were positive for Foxj1a +/Pkd2l1+/Olig2+, and were localized to the dorsal side of KA” neurons. Similarly, the Sox2 or Olig2 expressing neurons were intermingled with KAʼ neurons along the anterior-posterior axis in these regions. Further pharmaceutical treatment demonstrated that interference of Notch signaling resulted in the abnormal distribution of floor plate neurons together with strong dorsal body curvature at 3 days post fertilization in the zebrafish larvae. Our data showed the gene expression patterns and relative positions of the floor plate neurons; and suggested a potential role of Notch signaling during floor plate development.
Pengfei Zheng, Haibo Xie, Panpan Zhu, Chengtian Zhao . Distribution pattern of floor plate neurons in zebrafish[J]. Hereditas(Beijing), 2022 , 44(6) : 510 -520 . DOI: 10.16288/j.yczz.22-074
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