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Labeling DNA Probes

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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems
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DNA-Based Nanoprobes for Fluorescence K+ Sensing in Neural Systems.

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    This study introduces a new fluorescent nanoparticle sensor for visualizing potassium ion dynamics in neurons. This minimally invasive method offers a promising alternative to traditional electrodes for studying neurological conditions.

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    Area of Science:

    • Neuroscience
    • Biotechnology
    • Chemical Sensing

    Background:

    • Hippocampal potassium (K+) abnormalities are linked to seizures and neurological diseases.
    • Current K+ measurement methods use invasive electrodes, limiting spatial coverage.
    • A need exists for minimally invasive techniques to monitor K+ dynamics.

    Purpose of the Study:

    • To develop and validate a DNA-based fluorescence nanoprobe for sensing neuronal potassium ion concentrations.
    • To demonstrate the nanoprobe's ability to monitor K+ dynamics in response to electrical stimulation ex vivo.

    Main Methods:

    • Utilized a DNA-based fluorescence nanoprobe for potassium ion sensing.
    • Employed widefield fluorescence microscopy to observe fluorescence intensity changes in brain tissue.
    • Applied electrical stimulation ex vivo to induce and monitor K+ dynamics.

    Main Results:

    • The nanoprobe showed intracellular retention and linear fluorescence modulation with electrical current.
    • Demonstrated a fractional fluorescence change of ~1% per 10 mA stimulation in brain tissue.
    • Optical spectroscopy confirmed the nanoprobe's selectivity for potassium ions over other endogenous ions.

    Conclusions:

    • The developed nanoprobe enables direct visualization of potassium dynamics.
    • This technology can aid in understanding pathologies like migraines, seizures, and trauma.
    • Offers a minimally invasive alternative to electrode-based potassium measurements.