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Related Experiment Videos

[A fluorometric method of determining DNA in cells].

M M Ogievetskaia, M Sudnik-Khrynkevich

    Prikladnaia Biokhimiia I Mikrobiologiia
    |July 1, 1989
    PubMed
    Summary

    A new, fast method uses sarcosyl and sodium citrate for cell lysis and DNA solubilization. This technique accurately quantifies DNA using Hoechst No 33258 fluorescence, ideal for molecular biology applications.

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    Area of Science:

    • Molecular Biology
    • Biochemistry

    Background:

    • Accurate DNA quantification is crucial for molecular biology.
    • Existing cell lysis and DNA solubilization methods can be time-consuming.
    • Fluorescence-based methods offer sensitive DNA detection.

    Purpose of the Study:

    • To develop a rapid and convenient method for cell lysis and DNA solubilization.
    • To establish a reliable fluorescence-based assay for DNA quantification in cell lysates.
    • To optimize conditions for accurate DNA measurement using Hoechst No 33258.

    Main Methods:

    • Cell lysis and DNA solubilization using sarcosyl and sodium citrate.
    • DNA content determination via fluorescence enhancement with Hoechst No 33258.
    • Optimization of molar ratios for DNA and Hoechst dye, and NaCl concentration.

    Main Results:

    • The proposed method provides a convenient and express approach for cell lysis and DNA solubilization.
    • Hoechst No 33258 fluorescence enhancement accurately quantifies DNA in cell lysates.
    • Negligible Hoechst-RNA fluorescence observed in 0.5 M NaCl solution.
    • Optimal DNA:Hoechst molar ratio determined to be between 0.2 and 2.0 for accuracy.
    • Effective DNA quantification range established as 200-2000 ng/ml.

    Conclusions:

    • The developed method is efficient for simultaneous cell lysis and DNA solubilization.
    • Accurate DNA quantification is achievable using Hoechst No 33258 fluorescence under optimized conditions.
    • This method offers a valuable tool for rapid DNA analysis in biological samples.

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