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Related Concept Videos

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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The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more...
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Circulating MicroRNAs: Association with Lung Function in Asthma.

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Circulating microRNAs (miRNAs) are linked to asthma severity. These miRNAs may serve as biomarkers for lung function changes in asthma patients, reflecting disease biology.

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Area of Science:

  • Pulmonary Medicine
  • Genetics
  • Biomarkers

Background:

  • MicroRNAs (miRNAs) are regulators of gene expression implicated in asthma susceptibility.
  • The specific role of miRNAs in asthma severity and lung function decline remains largely unexplored.

Purpose of the Study:

  • To investigate circulating miRNAs as potential biomarkers for lung function in asthma.
  • To assess the association between specific miRNAs and measures of lung function, including FEV1/FVC, FEV1%, and FVC%.

Main Methods:

  • Serum samples from 160 Childhood Asthma Management Program participants were analyzed using a TaqMan microRNA array (754 primers).
  • Associations between detected miRNAs and lung function parameters (FEV1/FVC, FEV1%, FVC%) were evaluated.
  • Sex-specific and lung developmental associations were examined for a subset of miRNAs.

Main Results:

  • 74% of detected miRNAs were previously linked to asthma susceptibility.
  • 22, 4, and 8 miRNAs were associated with FEV1/FVC, FEV1%, and FVC%, respectively.
  • Several miRNAs showed associations with asthma-related pathways, sex-specific effects in boys, and fetal lung development.

Conclusions:

  • Circulating miRNAs are associated with lung function in asthma patients.
  • These miRNAs reflect underlying asthma biology and may serve as valuable biomarkers for asthma severity.