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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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A circle in the coordinate plane is defined as the set of all points that lie at a constant distance, known as the radius, from a fixed point called the center. This relationship is captured using the distance formula. For a point (x, y) on the circle and a center (h, k), the distance between them equals the radius r. By squaring both sides of the distance formula, the equation of the circle is written in standard form:Constructing the Equation from Geometric InformationIf the center and the...
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Microfluidic Exponential Rolling Circle Amplification for Sensitive microRNA Detection Directly from Biological

Hongmei Cao1, Xin Zhou1, Yong Zeng1,2

  • 1Department of Chemistry, University of Kansas, Lawrence, KS 66045.

Sensors and Actuators. B, Chemical
|December 12, 2018
PubMed
Summary

A new Microfluidic Exponential Rolling Circle Amplification (MERCA) platform enables sensitive microRNA detection directly in complex samples. This advanced biosensing technology bypasses laborious RNA extraction, improving clinical applications.

Keywords:
Microfluidic Exponential Rolling Circle Amplification (MERCA)cell-derived exosomescomplex biological samplesmicroRNA detectionraw cell lysate

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Sensitive quantification of low-abundance microRNAs (miRNAs) is crucial for diagnosing diseases, especially from liquid biopsies.
  • Current miRNA detection methods often require extensive sample preparation, limiting their clinical utility.
  • There is a need for streamlined, sensitive bioanalytical platforms for direct miRNA analysis.

Purpose of the Study:

  • To develop an integrated microfluidic platform for sensitive and specific microRNA detection directly in minimally processed biological samples.
  • To overcome the limitations of laborious sample pretreatment in existing miRNA biosensing techniques.
  • To establish a platform capable of analyzing microRNAs in various complex biological matrices, including exosomes.

Main Methods:

  • Development of an integrated Microfluidic Exponential Rolling Circle Amplification (MERCA) platform.
  • Streamlining solid-phase miRNA isolation, miRNA-adapter ligation, and dual-phase exponential rolling circle amplification (eRCA) in a single workflow.
  • Utilizing microfluidics combined with the high sensitivity of eRCA for enhanced bioassay performance.

Main Results:

  • The MERCA platform achieved a low limit of detection (<10 zeptomole) and single-nucleotide discrimination.
  • Quantitative detection of microRNAs was demonstrated in total RNA, raw cell lysate, and cell-derived exosomes.
  • High sensitivity enabled direct detection of low-level exosomal miRNAs from as few as 2 × 10^6 exosomes.
  • Results were validated against TaqMan RT-qPCR, confirming adaptability for complex biological materials.

Conclusions:

  • The MERCA platform offers a sensitive, specific, and streamlined approach for microRNA detection directly from minimally processed samples.
  • This technology addresses the critical challenge of sample consumption in exosome-based liquid biopsies.
  • MERCA provides a valuable tool for advancing microRNA analysis in diverse biological and clinical applications, facilitating biomarker discovery and diagnostics.