Lpar2b Controls Lateral Line Tissue Size by Regulating Yap1 Activity in Zebrafish

Frontiers in Molecular Neuroscience
Xueqian WangHui Xu

Abstract

LPA signaling plays important roles during cell migration and proliferation in normal and pathological conditions. However, its role during sensory organ development remains unknown. Here we show a LPA receptor Lpar2b is expressed in the posterior lateral line primordium (pLLP) and mechanosensory organs called neuromasts (NMs) in zebrafish embryos. Lpar2b loss-of-function significantly reduces the number of NMs and hair cells in the posterior lateral line (pLL). Further analysis reveals that Lpar2b regulates the patterning and tissue size of the pLLP. Interestingly, we show that knocking down a Hippo effector Yap1 phenocopies the result of Lpar2b depletion, and Lpar2b regulates the phosphorylation and activity of Yap1 in the pLLP. Importantly, a phosphorylation-resistant Yap1 rescues pLLP size and NM number in Lpar2b-depleted embryos. Our results indicate Lpar2b controls primordium size and NM number by regulating Yap1 activity in the lateral line system.

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Citations

Sep 26, 2020·Frontiers in Cell and Developmental Biology·Anqi ZhouLin Xiang

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Methods Mentioned

BETA
transgenic
in vitro transcription
PCR
confocal microscopy

Software Mentioned

ImageJ
Gene Tools
Adobe Photoshop®
Illustrator®

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