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- W4382282183 abstract "Abstract The MRTF-SRF pathway has been extensively studied for its crucial role in driving the expression of a large number of genes involved in actin cytoskeleton of various cell types. However, the specific contribution of MRTF-SRF in hair cells remains unknown. In this study, we showed that hair cell-specific deletion of Srf or Mrtfb , but not Mrtf a, leads to similar defects in the development of stereocilia dimensions and the maintenance of cuticular plate integrity. We used FACS-based hair cell RNA-seq analysis to investigate the mechanistic underpinnings of the changes observed in Srf and Mrtfb mutants, respectively. Interestingly, the transcriptome analysis revealed distinct profiles of genes regulated by Srf and Mrtfb , suggesting different transcriptional regulation mechanisms of actin cytoskeleton activities mediated by Srf and Mrtfb . Exogenous delivery of calponin 2 using Adeno-associated virus transduction in Srf mutants partially rescued the impairments of stereocilia dimensions and the F-actin intensity of cuticular plate, suggesting the involvement of Cnn2 , as an Srf downstream target, in regulating the hair bundle morphology and cuticular plate actin cytoskeleton organization. Our study uncovers, for the first time, the unexpected differential transcriptional regulation of actin cytoskeleton mediated by Srf and Mrtfb in hair cells, and also demonstrates the critical role of SRF-CNN2 in modulating actin dynamics of the stereocilia and cuticular plate, providing new insights into the molecular mechanism underlying hair cell development and maintenance." @default.
- W4382282183 created "2023-06-28" @default.
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- W4382282183 date "2023-06-26" @default.
- W4382282183 modified "2023-09-24" @default.
- W4382282183 title "Differential regulation of hair cell actin cytoskeleton mediated by SRF and MRTFB" @default.
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- W4382282183 doi "https://doi.org/10.1101/2023.06.26.546585" @default.
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