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Modification of 400 bp (approximate size) calf thymus DNA with OH radical resulted in lowered Tm, modification of thymine (58.3%), guanine (20%) and single strand breaks. Monoclonal antibodies (mAb) generated against ROS‐DNA were of IgG1 subclass. The mAb showed strong binding to ROS‐DNA and ROS‐modified bases and polymers, in particular, of thymine. The mAb, therefore, preferentially recognizes ROS‐modified epitopes on nucleic acids. Distinct binding to DNA isolated from aged, but not from normal humans by the monoclonal antibdy was observed. The antibody effectively recognized oxidative lesions in DNA from cancer patients. These studies demonstrate the potential application of the mAb as an immunochemical probe to detect oxidative DNA lesions.
IUBMB Life – Wiley
Published: Dec 1, 1997
Keywords: Reactive oxygen species; oxidative DNA damage; monoclonal antibody; antibody probe; cancer; aging
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