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DNA Repair
Spontaneous Alterations
Depurination and Deammination
Thymine Dimer
Deamintation
Depurination
Double-Strand Break Repair
DNA Recombination
Junction
ssDNA Hybridization
Rec A in Homologous Recombinaton at DNA
Synapsis
Holiday Junction
Resolving Holiday Junction
General Recombination in Mitotic and Meiotic Cells
Site Specific Recombination
• Moving of mobile genetic elements between non-homologous DNA
• Transpositional site-specific recombination– DNA only transposition
• Cut and Pase transposition• Replicative transposition
– Retroviral-like retrotransposition– Nonretroviral retrotransposition
• Conservative site-specific recombination
Bacterial Transposons
Cut-and-Paste Transposition
Replicative Transposon
Replicative Transposon
Retrovirus
Site-specific recombintaion by a retro virus or a retrovirus-like
retrotransposon
Nonretroviral Retrotransposon
Conservative site specific recombination