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Transcriptional analysis of tendons and tenocytes from mice with a targeted deletion of scleraxis

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus

PROVIDER: GSE145864 | GEO | 2020/02/24

REPOSITORIES: GEO

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Transcriptional analysis of tenocytes from mice with a targeted deletion of scleraxis

Project description:We report RNA sequencing data from tenocytes cultured from the tail tendons of adult male mice in the C57Bl/6 background that either have the scleraxis gene (Scx+) or mice in which scleraxis has been deleted using CreERT2 driven from the Rosa26 locus using 4-hydroxytamoxifen (4HT).

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Transcriptional analysis of tendons from mice with a targeted deletion of scleraxis

Project description:We report RNA sequencing data from the plantaris tendons of adult male mice in the C57Bl/6 background that either have the scleraxis gene (Scx+) or mice in which scleraxis has been deleted using CreERT2 driven from the Rosa26 locus (Scx-). Mice in which scleraxis was deleted were created by crossing scleraxis-floxed mice with Rosa26-CreERT2 mice. Rosa26-CreERT2 mice that did not have a floxed scleraxis allele served as controls. Mice were treated with tamoxifen for 5 days to induce recombination at the scleraxis locus, and then subjected to a synergist ablation procedure in which the Achilles tendon is removed, resulting in compensatory growth of the plantaris tendon. Mice were analyzed either 7 or 14 days after synergist ablation. Control mice that did not undergo tamoxifen treatment or synergist ablation were also studied (NOC).

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Transcriptional analysis of tendons and tenocytes from mice with a targeted deletion of scleraxis

Project description:Transcriptional analysis of tendons and tenocytes from mice with a targeted deletion of scleraxis

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Scleraxis is a transcriptional activator that regulates the expression of Tenomodulin, a marker of mature tenocytes and ligamentocytes.

Project description:Tenomodulin (Tnmd) is a type II transmembrane glycoprotein predominantly expressed in tendons and ligaments. We found that scleraxis (Scx), a member of the Twist-family of basic helix-loop-helix transcription factors, is a transcriptional activator of Tnmd expression in tenocytes. During embryonic development, Scx expression preceded that of Tnmd. Tnmd expression was nearly absent in tendons and ligaments of Scx-deficient mice generated by transcription activator-like effector nucleases-mediated gene disruption. Tnmd mRNA levels were dramatically decreased during serial passages of rat tenocytes. Scx silencing by small interfering RNA significantly suppressed endogenous Tnmd mRNA levels in tenocytes. Mouse Tnmd contains five E-box sites in the ~1-kb 5'-flanking region. A 174-base pair genomic fragment containing a TATA box drives transcription in tenocytes. Enhancer activity was increased in the upstream region (-1030 to -295) of Tnmd in tenocytes, but not in NIH3T3 and C3H10T1/2 cells. Preferential binding of both Scx and Twist1 as a heterodimer with E12 or E47 to CAGATG or CATCTG and transactivation of the 5'-flanking region were confirmed by electrophoresis mobility shift and dual luciferase assays, respectively. Scx directly transactivates Tnmd via these E-boxes to positively regulate tenocyte differentiation and maturation.

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