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MicroRNAs01:22

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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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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The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
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Investigation of the Transcriptional Role of a RUNX1 Intronic Silencer by CRISPR/Cas9 Ribonucleoprotein in Acute Myeloid Leukemia Cells
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MicroRNA-590-5p Stabilizes Runx2 by Targeting Smad7 During Osteoblast Differentiation.

M Vishal1, S Vimalraj1, R Ajeetha1

  • 1Department of Biotechnology, School of Bioengineering, SRM University, Kattankulathur, Tamil Nadu, India.

Journal of Cellular Physiology
|May 19, 2016
PubMed
Summary
This summary is machine-generated.

MicroRNA-590-5p promotes osteoblast differentiation by targeting Smad7, indirectly stabilizing Runx2 protein. This mechanism enhances bone formation by regulating mesenchymal stem cell differentiation.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Mesenchymal stem cells (MSCs) differentiate into osteoblasts, a process regulated by microRNAs (miRNAs).
  • Runx2 is a key transcription factor for osteoblast differentiation.
  • Identifying miRNA regulators of osteogenesis is crucial for understanding bone formation.

Purpose of the Study:

  • To investigate the role of miR-590-5p in osteoblast differentiation.
  • To identify the targets of miR-590-5p involved in regulating osteogenesis.
  • To elucidate the mechanism by which miR-590-5p influences Runx2 activity.

Main Methods:

  • In silico analysis to predict miRNA targets.
  • Transfection of mouse MSCs with miR-590-5p mimic.
  • Analysis of osteoblast differentiation markers (calcium deposition, ALP, collagen).
  • Luciferase reporter assay to confirm direct targeting of Smad7 by miR-590-5p.

Main Results:

  • miR-590-5p expression increased during osteoblast differentiation.
  • miR-590-5p mimic transfection enhanced osteogenic marker expression and calcium deposition in mMSCs.
  • Smad7 was identified as a direct target of miR-590-5p, with its expression reduced upon mimic transfection.
  • Runx2 protein levels increased indirectly following miR-590-5p mimic transfection, independent of direct Runx2 targeting.

Conclusions:

  • miR-590-5p promotes osteoblast differentiation.
  • The mechanism involves miR-590-5p targeting Smad7, leading to the stabilization of Runx2 protein.
  • This pathway offers a novel regulatory mechanism in osteogenesis.