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Single Nucleotide Polymorphisms-SNPs01:05

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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Monitoring Protein Adsorption with Solid-state Nanopores
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Identification of Single Nucleotides by a Tiny Charged Solid-State Nanopore.

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    Researchers differentiated single nucleotides using nanopore measurements. Electroosmotic flow enabled unique current signals and longer dwell times, allowing for nucleotide identification based on volume and translocation speed.

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    Area of Science:

    • Nanotechnology
    • Biophysics
    • Molecular Biology

    Background:

    • Discriminating individual nucleotides is difficult due to their subtle differences.
    • Nanopore sensing offers a potential method for single-molecule analysis.

    Purpose of the Study:

    • To investigate the translocation of single nucleotides through a silicon nitride nanopore.
    • To determine if unique blockade currents and dwell times can be achieved for nucleotide discrimination.

    Main Methods:

    • Measuring blockade currents during single nucleotide translocation through a 1.8 nm nanopore.
    • Applying bias voltage and analyzing translocation dynamics driven by electroosmotic flow.
    • Utilizing the 1D Fokker-Planck equation to model dwell-time distributions and deduce kinetic parameters.
    • Performing molecular dynamics simulations to validate findings.

    Main Results:

    • Single nucleotides exhibited unique and differentiable blockade currents correlated with their volume.
    • Electroosmotic flow, not electrophoretic force, primarily drove nucleotide translocation.
    • Longer dwell times (hundreds of microseconds) facilitated nucleotide identification.
    • Larger nucleotides translocated faster, attributed to increased drag force from electroosmotic flow.

    Conclusions:

    • Nanopore sensing with electroosmotic flow allows for the discrimination of single nucleotides.
    • Nucleotide volume and translocation velocity are key parameters for identification.
    • The study provides insights into the physics of molecule translocation in nanopores.