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Related Concept Videos

MicroRNAs01:22

MicroRNAs

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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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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
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Author Spotlight: Analyzing Bone Marrow Microenvironment in Murine Hematological Malignancies
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Microarray profiling defines circulating microRNAs associated with myelodysplastic syndromes.

M Dostalova Merkerova, A Hrustincova, Z Krejcik

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    Summary

    Specific circulating microRNAs (miRNAs) in plasma can predict myelodysplastic syndromes (MDS) patient outcomes. Lower levels of certain miRNAs indicate higher risk and poorer survival, offering potential new biomarkers for MDS prognosis.

    Keywords:
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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Oncology

    Background:

    • Circulating microRNAs (miRNAs) are non-coding RNAs found in body fluids.
    • Aberrant miRNA levels are linked to various diseases, suggesting their potential as clinical biomarkers.
    • Myelodysplastic syndromes (MDS) are a group of clonal hematopoietic stem cell disorders.

    Purpose of the Study:

    • To investigate circulating miRNA profiles in myelodysplastic syndromes (MDS) patients.
    • To identify specific miRNAs that discriminate between patients with different prognoses.
    • To evaluate the prognostic value of identified miRNAs in MDS.

    Main Methods:

    • Plasma samples from MDS patients were analyzed using microarrays to profile circulating miRNAs.
    • Deregulation of specific miRNAs was further validated using droplet digital PCR.
    • Multivariate analysis was employed to assess the predictive power of miRNA levels for survival outcomes.

    Main Results:

    • Levels of miR-27a-3p, miR-150-5p, miR-199a-5p, miR-223-3p, and miR-451a were reduced in higher-risk MDS patients.
    • miR-451a was identified as an independent predictor of progression-free survival (HR = 0.072, P = 0.006).
    • miR-223-3p levels showed a significant association with overall survival (HR = 0.039, P = .032).

    Conclusions:

    • Plasma levels of specific miRNAs are associated with MDS patient prognosis.
    • These miRNAs may provide additional prognostic information beyond existing scoring systems.
    • Circulating miRNAs hold potential as novel biomarkers for predicting MDS outcomes.