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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...
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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 Expression Profiling in Psoriatic Arthritis.

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Researchers identified specific microRNA (miRNA) signatures in psoriatic arthritis (PsA) patients. Downregulated miR-126-3p in active PsA suggests potential as a biomarker and therapeutic target.

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Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • Psoriatic arthritis (PsA) is an inflammatory condition involving bone erosion and formation.
  • MicroRNAs (miRNAs) are crucial immune response regulators, but their role in PsA pathogenesis is unclear.

Purpose of the Study:

  • To identify miRNA expression signatures linked to PsA.
  • To explore the potential involvement of these miRNAs in PsA pathogenesis.

Main Methods:

  • MicroRNA microarray analysis in blood cells from PsA patients and healthy controls.
  • Pathway and transcriptome analyses integrating global miRNA profiling with gene expression data.
  • Validation of selected miRNA deregulation using real-time PCR.

Main Results:

  • Identified distinct miRNA signatures in PsA patients with active disease.
  • Targeted pathways include TNF, MAPK, and WNT signaling.
  • miR-126-3p was significantly downregulated in active PsA; its overexpression reduced PsA-implicated gene expression.

Conclusions:

  • This study highlights epigenetic factors in PsA by identifying specific miRNAs.
  • These miRNAs show promise as potential biomarkers for PsA.
  • Identified miRNAs may guide the development of novel therapeutic strategies for PsA.