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Related Experiment Videos

Quantitation of cellular deoxyribonucleic acid by flow microfluorometry

P B Coulson, A O Bishop, R Lenarduzzi

    The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
    |October 1, 1977
    PubMed
    Summary

    This study introduces a simple method to standardize flow microfluorometry by using nucleated red blood cells for absolute deoxyribonucleic acid (DNA) quantification. This approach enables reliable comparisons of DNA content per cell across experiments and labs.

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    Area of Science:

    • Cell Biology
    • Biophysics
    • Biochemistry

    Background:

    • Flow microfluorometry often reports relative fluorescent units, hindering inter-experiment and inter-laboratory comparisons.
    • Standardization is crucial for accurate quantitative analysis of cellular components like deoxyribonucleic acid (DNA).

    Purpose of the Study:

    • To establish an easy and reproducible method for standardizing relative fluorescent units in flow microfluorometry.
    • To enable the determination of absolute deoxyribonucleic acid (DNA) content per cell using a reference standard.

    Main Methods:

    • Utilized nucleated red blood cells from various species as references for quantitative DNA analysis.
    • Characterized cells for DNA content over a range of 2 pg/cell to 93 pg/cell.
    • Employed acridine-orange (green) and propidium iodide (red) fluorescence staining, optimizing gain controls and current for linear results.

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    Main Results:

    • Achieved linear fluorescence staining curves across the investigated DNA range (2-93 pg/cell) with optimized parameters.
    • Established a standardization curve equivalent to mammalian cell DNA content from 1N (3.5 pg/cell) to 28N (91 pg/cell).
    • Validated the method by comparing standard curves with mammalian cell preparations (bovine thymus and liver), yielding consistent DNA values.

    Conclusions:

    • Nucleated red blood cells provide a reliable and accessible standard for absolute DNA quantification in flow microfluorometry.
    • This standardization method facilitates consistent and comparable results across different experiments, staining protocols, and laboratories.
    • Routine implementation of this technique will enhance the reproducibility and comparability of flow microfluorometry data in biological research.