Identification of Components of the Hippo Pathway in Hydra and Potential Role of YAP in Cell Division and Differentiation

被引:4
|
作者
Unni, Manu [1 ,2 ]
Reddy, Puli Chandramouli [1 ]
Pal, Mrinmoy [1 ]
Sagi, Irit [2 ]
Galande, Sanjeev [1 ,3 ]
机构
[1] Indian Inst Sci Educ & Res, Ctr Excellence Epigenet, Dept Biol, Pune, Maharashtra, India
[2] Weizmann Inst Sci, Dept Biol Regulat, Rehovot, Israel
[3] Shiv Nadar Univ, Dept Life Sci, Delhi, India
基金
欧洲研究理事会;
关键词
hydra; hippo pathway; YAP; budding; cell prolferation; MULTIPLE SEQUENCE ALIGNMENT; AXIS FORMATION; MST1; KINASE; DOMAIN; HEAD; GENE; PHOSPHORYLATION; ACTIVATION; BRACHYURY; EVOLUTION;
D O I
10.3389/fgene.2021.676182
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
The Hippo signaling pathway has been shown to be involved in regulating cellular identity, cell/tissue size maintenance and mechanotransduction. The Hippo pathway consists of a kinase cascade which determines the nucleo-cytoplasmic localization of YAP in the cell. YAP is the effector protein in the Hippo pathway, which acts as a transcriptional cofactor for TEAD. Phosphorylation of YAP upon activation of the Hippo pathway prevents it from entering the nucleus and abrogates its function in the transcription of the target genes. In Cnidaria, the information on the regulatory roles of the Hippo pathway is virtually lacking. Here, we report the existence of a complete set of Hippo pathway core components in Hydra for the first time. By studying their phylogeny and domain organization, we report evolutionary conservation of the components of the Hippo pathway. Protein modelling suggested the conservation of YAP-TEAD interaction in Hydra. Further, we characterized the expression pattern of the homologs of yap, hippo, mob and sav in Hydra using whole-mount RNA in situ hybridization and report their possible role in stem cell maintenance. Immunofluorescence assay revealed that Hvul_YAP expressing cells occur in clusters in the body column and are excluded in the terminally differentiated regions. Actively proliferating cells marked by Ki67 exhibit YAP colocalization in their nuclei. Strikingly, a subset of these colocalized cells is actively recruited to the newly developing bud. Disruption of the YAP-TEAD interaction increased the budding rate indicating a critical role of YAP in regulating cell proliferation in Hydra. Collectively, we posit that the Hippo pathway is an essential signaling system in Hydra; its components are ubiquitously expressed in the Hydra body column and play a crucial role in Hydra tissue homeostasis.
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页数:19
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