While, perturbation of RPTKs by aberrant expression or mutation could promote cellular transformation and tumorigenesis [ 24].
Therefore, we investigated whether the mechanism whereby DDR2 mutation could promote EMT process in lung SCC cells.
Further investigation indicated that enhanced DDR2 and its S131C mutation could promote HBE and lung SCC cells proliferation, migration and invasion partly via promoting EMT through regulating MMP-2 and E-cadherin expression.
It was also discovered that a mechanism to induce MRP2 activation, activated in cholestatic conditions, is removed by a specific mutation and as such could promote the onset of cholestasis (Russmann et al. 2010).
Microsatellite instability is not therefore the sole result or indicator of DNA MMR failure, and transient MMR inactivation (e.g. via EPEC infection) could promote mutations in cancer relevant genes without causing MSI.
The mutation of S131C in DDR2 could promote lung SCC cells proliferation, migration and invasion via inducing MMP-2, but reducing E-cadherin expression.
This work identified several genes or proteins, including RAS, RAGE, AKT, DVL, IKK, RB and PTEN, whose mutation or loss of function could promote the cancer cell and stellate cell's proliferation and inhibit apoptosis, leading to uncontrolled growth and unorganized angiogenesis in the future.
Second, restriction of mutagenesis to small zones, even if randomly chosen, could promote high-level multiple mutations (concerted evolution) within genes without causing deleterious mutations throughout the genome (Ninio, 1996; Ponder et al., 2005; Yang et al., 2008).
The HVRs of GAS M proteins elicit the production of protective antibodies in the host, and mutations in this region of emm genes could promote escape from immune clearance [ 44].
Again, the mutation of the G protein Ras, often seen in NF1 tumors, could promote tumorigenesis due to a prolonged or persistent arrest in the activated GTP loaded state.
Therefore, impaired p53 function, dependent on a decrease in FOXO3, could promote survival and proliferation of cells harbouring mutations.
