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Related Concept Videos

Labeling DNA Probes03:31

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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Tracing Gene Expression Through Detection of &#946;-galactosidase Activity in Whole Mouse Embryos
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Detecting β-Galactosidase-Labeled Cells.

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    This summary is machine-generated.

    Beta-galactosidase is a widely used enzyme label for immunoassays and immunocytochemistry. Its substrate, X-gal, produces a stable, intense blue product for clear detection.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Immunology

    Background:

    • Beta-galactosidase is a crucial enzyme utilized in various biological assays.
    • Its application as a label in enzyme immunoassays and immunocytochemistry is well-established.

    Purpose of the Study:

    • To highlight the utility of beta-galactosidase as a biological label.
    • To introduce and describe the properties of a specific substrate for beta-galactosidase detection.

    Main Methods:

    • Enzyme-linked assays utilizing beta-galactosidase.
    • Histochemical staining techniques for immunocytochemistry.

    Main Results:

    • 5-bromo-4-chloro-3-indolyl-β-d-galactopyranoside (X-gal) serves as an effective substrate for beta-galactosidase.
    • X-gal yields an intense blue precipitate upon enzymatic cleavage.
    • The resulting blue product exhibits stability and insolubility in both water and alcohol.

    Conclusions:

    • X-gal is a highly suitable substrate for beta-galactosidase detection in biochemical and cellular studies.
    • The intense and stable blue product facilitates clear visualization and interpretation in enzyme immunoassays and immunocytochemistry.