DNA Damage a. single base changes 1. Deamination 2. Replication error b. structural distortions 1. Ultraviolet irradiation 2. Alkylation 3. Depurination
DNA repair n n n Direct repair Excision repair ☆Mismatch repair Recombination repair ☆SOS system
討論 TYPE OF DAMAGE events/cell/day % of total daily damage Single-strand break 120, 000 50. 9 N 7 -Methyl. Guanine 84, 000 35. 6 Depurination 24, 000 10. 2 Oxidized DNA 2, 880 1. 2 Depyrimidation 1, 320 0. 5 Cytosine deamination 360 0. 2 Double-strand breaks 9 0. 01
參考文獻 n n Gene VII, Chapter 14, Oxford University Press 現代遺傳學, 第二十章, 藝軒出版