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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...
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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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Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
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The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws.
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ELIME Enzyme Linked Immuno Magnetic Electrochemical Method for Mycotoxin Detection
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Molecular methods in electrochemical microRNA detection.

Philip Gillespie1, Sylvain Ladame1, Danny O'Hare1

  • 1Department of Bioengineering, Imperial College London, South Kensington Campus, London, SW72AZ, UK. d.ohare@imperial.ac.uk.

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Electrochemical sensors offer sensitive and scalable detection of microRNAs (miRNAs), small non-coding RNAs crucial for diagnosing diseases like cancer. This review highlights promising electrochemical strategies for miRNA biomarker sensing.

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Area of Science:

  • Biomedical Engineering
  • Molecular Diagnostics
  • Biosensing Technologies

Background:

  • High-throughput nucleic acid profiling is vital for early disease diagnosis, particularly cancer.
  • MicroRNAs (miRNAs) are key non-coding RNA biomarkers involved in gene regulation and disease progression.
  • Challenges in miRNA detection include small size, low abundance, and sequence similarity.

Purpose of the Study:

  • To review and highlight promising electrochemical sensing strategies for microRNA biomarkers.
  • To address the challenges in developing quantitative, ultrasensitive, and specific miRNA detection methods.
  • To compare electrochemical methods with optical techniques for miRNA sensing.

Main Methods:

  • Review of current literature on electrochemical miRNA sensing technologies.
  • Analysis of strategies for enhancing sensitivity and specificity in miRNA detection.
  • Comparison of advantages offered by electrochemical sensors over optical methods.

Main Results:

  • Electrochemical sensors demonstrate significant advantages in sensitivity and scalability for miRNA detection.
  • Various strategies are being developed to overcome limitations in miRNA sensing.
  • Promising electrochemical approaches offer potential for improved disease diagnostics.

Conclusions:

  • Electrochemical sensing presents a powerful platform for the ultrasensitive and specific detection of miRNA biomarkers.
  • These advancements hold significant promise for early disease diagnosis and prognosis.
  • Further development of electrochemical strategies is crucial for clinical translation.