Hippo signaling in Drosophila and mammals is prominent in regulating cell proliferation, death and differentiation. Hippo signaling effectors (YAP/TAZ) exhibit crosstalk with transforming growth factor-β (TGF-β)-Smad and Wnt-β-catenin pathways. Previously, we implicated Smad7 and β-catenin in myogenesis. Therefore, we assessed a potential role of TAZ on theSmad7/β-catenin complex in muscle cells. Here, we document functional interactions between Smad7, TAZ and β-catenin in myogenic cells. Ectopic TAZ expression resulted in repression of the muscle-specific creatine kinase muscle (ckm) gene promoter and its corresponding protein level. Depletion of endogenous TAZ enhanced ckm promoter activation. Ectopic TAZ, while potently active on a TEAD reporter (HIP-HOP), repressed myogenin and myod enhancer regions and Myogenin protein level. Additionally, a Wnt/β-catenin readout (TOP flash) demonstrated TAZ inhibition of β-catenin activity. In myoblasts, TAZ is predominantly localized in nuclear speckles, while in differentiation conditions TAZ is hyperphosphorylated at Ser 89 leading to enhanced cytoplasmic sequestration. Finally, live cell imaging indicates that TAZ exhibits properties of liquid-liquid phase separation (LLPS). These observations indicate that TAZ, as an effector of Hippo signaling, supresses the myogenic differentiation machinery.
ACCEPTED MANUSCRIPT
RESEARCH ARTICLE|
03 December 2021
TAZ exhibits phase separation properties and interacts with Smad7 and β-catenin to repress skeletal myogenesis
Soma Tripathi,
Soma Tripathi
‡
1
Department of Biology, York University, Toronto, ON, M3J 1P3
, Canada
2
Muscle Health Research Centre (MHRC), York University, Toronto, ON, M3J 1P3
, Canada
3
Centre for Research in Biomolecular Interactions (CRBI), York University, Toronto, ON, M3J 1P3
, Canada
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Tetsuaki Miyake,
Tetsuaki Miyake
‡
1
Department of Biology, York University, Toronto, ON, M3J 1P3
, Canada
2
Muscle Health Research Centre (MHRC), York University, Toronto, ON, M3J 1P3
, Canada
3
Centre for Research in Biomolecular Interactions (CRBI), York University, Toronto, ON, M3J 1P3
, Canada
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Jonathan Kelebeev,
Jonathan Kelebeev
1
Department of Biology, York University, Toronto, ON, M3J 1P3
, Canada
2
Muscle Health Research Centre (MHRC), York University, Toronto, ON, M3J 1P3
, Canada
3
Centre for Research in Biomolecular Interactions (CRBI), York University, Toronto, ON, M3J 1P3
, Canada
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John C. McDermott
John C. McDermott
*
1
Department of Biology, York University, Toronto, ON, M3J 1P3
, Canada
2
Muscle Health Research Centre (MHRC), York University, Toronto, ON, M3J 1P3
, Canada
3
Centre for Research in Biomolecular Interactions (CRBI), York University, Toronto, ON, M3J 1P3
, Canada
4
Centre for Research in Mass Spectrometry (CRMS), York University, Toronto, ON, M3J 1P3
, Canada
*Author for correspondence: jmcderm@yorku.ca
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Soma Tripathi
‡
1
Department of Biology, York University, Toronto, ON, M3J 1P3
, Canada
2
Muscle Health Research Centre (MHRC), York University, Toronto, ON, M3J 1P3
, Canada
3
Centre for Research in Biomolecular Interactions (CRBI), York University, Toronto, ON, M3J 1P3
, Canada
Tetsuaki Miyake
‡
1
Department of Biology, York University, Toronto, ON, M3J 1P3
, Canada
2
Muscle Health Research Centre (MHRC), York University, Toronto, ON, M3J 1P3
, Canada
3
Centre for Research in Biomolecular Interactions (CRBI), York University, Toronto, ON, M3J 1P3
, Canada
Jonathan Kelebeev
1
Department of Biology, York University, Toronto, ON, M3J 1P3
, Canada
2
Muscle Health Research Centre (MHRC), York University, Toronto, ON, M3J 1P3
, Canada
3
Centre for Research in Biomolecular Interactions (CRBI), York University, Toronto, ON, M3J 1P3
, Canada
John C. McDermott
*
1
Department of Biology, York University, Toronto, ON, M3J 1P3
, Canada
2
Muscle Health Research Centre (MHRC), York University, Toronto, ON, M3J 1P3
, Canada
3
Centre for Research in Biomolecular Interactions (CRBI), York University, Toronto, ON, M3J 1P3
, Canada
4
Centre for Research in Mass Spectrometry (CRMS), York University, Toronto, ON, M3J 1P3
, Canada
‡
These authors contributed equally to the manuscript.
*Author for correspondence: jmcderm@yorku.ca
Received:
06 Jul 2021
Accepted:
18 Nov 2021
Online ISSN: 1477-9137
Print ISSN: 0021-9533
Funding Group:
- Award Group:
- Funder(s): the Canadian Institute of Health Research
- Award Id(s): PJT-159644
- Funder(s):
J Cell Sci jcs.259097.
Article history
Received:
06 Jul 2021
Accepted:
18 Nov 2021
Currently Viewing Accepted Manuscript - Newer Version Available
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Citation
Soma Tripathi, Tetsuaki Miyake, Jonathan Kelebeev, John C. McDermott; TAZ exhibits phase separation properties and interacts with Smad7 and β-catenin to repress skeletal myogenesis. J Cell Sci 2021; jcs.259097. doi: https://doi.org/10.1242/jcs.259097
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