Site of DNA cleavage - Recombination Signal Sequence (RSS) 

TLS Online TPP Program

#Id: 6119

#Unit 3. Fundamental Processes

Mutations in MutS/L components can lead to hereditary nonpolyposis colorectal cancer (HNPCC). A characteristic feature of HNPCC is microsatellite instability, in which the lengths (numbers of repeats) of microsatellite sequences change rapidly in the tumor cells due to the loss of the mismatch repair system to correct replication slippage in these sequences.

TLS Online TPP Program

#Id: 6120

#Unit 3. Fundamental Processes

Eukaryotic cells lack MutH and uses Okazaki fragments nick to recognise daughter starnds

TLS Online TPP Program

#Id: 6121

#Unit 3. Fundamental Processes

The MutT, -M, -Y system handles the consequences of oxidative damage. Major type of chemical damage is caused by oxidation of G to 8-oxo-G

TLS Online TPP Program

#Id: 6122

#Unit 3. Fundamental Processes

The deamination generates a G-T/C-T mismatch pair, MutL and MutS remove T from both G-T and C-T mismatches.

TLS Online TPP Program

#Id: 6123

#Unit 3. Fundamental Processes

Base excision repair is triggered by directly removing a damaged base from DNA. In E.coli, system include

Uracil DNA glycosylases

AP endonuclease

DNA polymerase I 

DNA ligase

TLS Online TPP Program

#Id: 6124

#Unit 3. Fundamental Processes