Untitled

Abstract

Some features of the ultraviolet mutagenesis Ultraviolet radiation produces cyclobutane pyrimidine dimers under induced by UVB irradiation. 1,2 Cis-syn cyclobutane pyrimidine dimers are a large majority of mutations induced by ultraviolet light. 3,4 In cells of E. coli, irradiation with a wavelength of 260 nm produces about 40% of thymine dimers, 5%-19% of cytosine dimers and 19%-22% of dimers consisting of cytosine and thymine. For UVC and UVB, the total relative proportion of cyclobutane pyrimidine dimers formed in the thymine-thymine, thymine-cytosine, cytosine-thymine and cytosine-cytosine sites was about 28%, 26%, 16% and 30%,