In situPYRIMIDINE DIMER DETERMINATION BY LASER CYTOMETRY

Abstract
Abstract—By using antiserum against pyrimidine dimers and argon‐laser imaging microspectrofluoro‐metry, we established a new method to determine UV‐induced pyrimidine dimers and their repair in individual human cells. The method was sensitive enough to determine dimers induced by UV dose as low as 2 J/m2. Normal human cells repaired 50 and 60% of total damage within 8 and 24 h after UV irradiation (20 J/m2), butXeroderma pigmentosumcells (complementation group A) were unable to repair any within the same period. Therefore, the method proved to be a quick, easy, sensitive and accurate means to determine pyrimidine dimersin situ.

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