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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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Updated: May 6, 2026

Lung microRNA Profiling Across the Estrous Cycle in Ozone-exposed Mice
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Challenges for MicroRNA Microarray Data Analysis.

Bin Wang1, Yaguang Xi

  • 1Department of Mathematics and Statistics, University of South Alabama, 411 University BLVD N, Room 325, Mobile, AL 36688, USA; bwang@southalabama.edu.

Microarrays (Basel, Switzerland)
|October 29, 2013
PubMed
Summary
This summary is machine-generated.

Traditional microarray normalization methods fail for microRNA (miRNA) arrays due to low target numbers and expression levels. Novel strategies are needed for accurate miRNA profiling and reliable genomic research.

Keywords:
bead arraymeasurement errormicroRNAmicroarraynormalizationqRT-PCR

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • Microarrays are high-throughput tools for genomic research, relying on probe-target hybridization to quantify nucleic acid abundance.
  • Normalization is crucial in microarray analysis to mitigate non-biological variations and ensure data quality.
  • Established normalization methods assume a large number of genes and stable expression in the majority, which is unsuitable for microRNA (miRNA) arrays.

Purpose of the Study:

  • To review current microarray platforms for miRNA profiling.
  • To compare traditional normalization techniques with novel strategies tailored for miRNA analysis.

Main Methods:

  • Discussion of representative miRNA microarray platforms.
  • Comparative analysis of existing and novel normalization methods for miRNA expression data.

Main Results:

  • Traditional normalization assumptions are not met by miRNA arrays due to limited miRNA numbers (<2,000) and variable expression.
  • Novel normalization strategies are required to address the unique characteristics of miRNA profiling.

Conclusions:

  • Existing normalization methods are inadequate for miRNA microarrays.
  • Development and application of specific normalization strategies are essential for accurate miRNA expression profiling.