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Related Concept Videos

MicroRNAs01:22

MicroRNAs

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...
MicroRNAs01:22

MicroRNAs

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 ends...
Experimental RNAi02:15

Experimental RNAi

RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...

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Updated: May 26, 2026

A Complete Pipeline for Isolating and Sequencing MicroRNAs, and Analyzing Them Using Open Source Tools
09:29

A Complete Pipeline for Isolating and Sequencing MicroRNAs, and Analyzing Them Using Open Source Tools

Published on: August 21, 2019

How the RNA isolation method can affect microRNA microarray results.

Agnieszka Podolska1, Bogumil Kaczkowski, Thomas Litman

  • 1Department of Basic Animal and Veterinary Sciences, Section of Genetics and Bioinformatics, University of Copenhagen, Copenhagen, Denmark.

Acta Biochimica Polonica
|December 8, 2011
PubMed
Summary
This summary is machine-generated.

RNA isolation methods significantly impact microRNA microarray results. Different methods yield varying microRNA quantification, highlighting the need for standardized protocols in gene expression studies.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biochemistry

Background:

  • RNA quality is critical for accurate gene expression analysis.
  • Degraded RNA can lead to erroneous microRNA quantification and gene expression measurements.
  • MicroRNA (miRNA) analysis is sensitive to RNA integrity and isolation techniques.

Purpose of the Study:

  • To evaluate the impact of two distinct RNA isolation methods on microRNA microarray analysis in porcine brain tissue.
  • To determine if different RNA fractions (total RNA vs. small RNA) affect miRNA expression profiling.
  • To assess the sensitivity of specific microRNAs to RNA isolation procedures.

Main Methods:

  • Comparison of a phenol-guanidine isothiocyanate-based total RNA isolation method with a column-based small RNA isolation method (miRvana™).
  • Performance of microRNA microarray analysis on RNA extracted using both methods.
  • Analysis of differential results obtained from the two RNA isolation techniques.

Main Results:

  • MicroRNA microarray analyses yielded different results depending on the RNA fraction utilized.
  • Certain microRNAs demonstrated significant sensitivity to the chosen RNA isolation method.
  • The choice of RNA isolation technique directly influenced the observed miRNA expression profiles.

Conclusions:

  • The method of RNA isolation critically affects microRNA microarray outcomes.
  • Direct comparison of miRNA microarray studies using different RNA isolation procedures should be approached with caution.
  • Standardization of RNA isolation protocols is recommended for reproducible miRNA expression profiling.