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Related Concept Videos

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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Chromatin Immunoprecipitation Assay for Tissue-specific Genes using Early-stage Mouse Embryos
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miR-98 delays skeletal muscle differentiation by down-regulating E2F5.

Jeremie Kropp1, Cindy Degerny1, Nadezda Morozova1

  • 1*CNRS FRE 3377, CEA Saclay, F-91191 Gif-sur-Yvette, France.

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MicroRNA-98 (miR-98) depletion enhances skeletal muscle differentiation by targeting the E2F5 transcription factor. This mechanism involves E2F5 regulating genes that inhibit terminal muscle differentiation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • MicroRNAs (miRNAs) are key regulators of gene expression.
  • The let-7 family of miRNAs, including miR-98, plays a role in cellular differentiation.
  • Previous studies indicated that miR-98 knockdown promotes myogenic differentiation.

Purpose of the Study:

  • To identify genes regulated by miR-98 during human myoblast differentiation.
  • To elucidate the molecular mechanism by which miR-98 influences skeletal muscle differentiation.
  • To investigate the role of E2F5 as a direct target of miR-98.

Main Methods:

  • Genome-wide screen to identify miRNAs affecting myogenic differentiation.
  • Transcriptomic analysis of human myoblasts following miR-98 knockdown.
  • Validation of direct miRNA-target interactions and functional assays.
  • Analysis of transcription factor binding to target gene promoters.

Main Results:

  • Knockdown of miR-98 significantly altered the expression of approximately 240 genes in human myoblasts.
  • E2F5 was identified as a direct transcriptional repressor target of miR-98.
  • Simultaneous knockdown of E2F5 and miR-98 largely rescued normal myogenic differentiation.
  • E2F5 directly binds to the promoters of ID1 and HMOX1, inhibiting their expression.

Conclusions:

  • miR-98 regulates skeletal muscle terminal differentiation.
  • This regulation occurs through miR-98 targeting of the transcription factor E2F5.
  • E2F5, in turn, modulates the expression of downstream targets involved in differentiation inhibition.