
Originally Posted by
Thermaltake
Are some mutations reversable? If there is, name some?
DNA repair systems correct mutations if they are detected before replication of the mutation. A commonly cited example is correction of thymidine dimers; individuals lacking the repair system have the condition xeroderma pigmentosum. Generally, 'mismatch repair' can also be accomplished, and the correct base is determined by virtue of the fact that the 'older' DNA strand is more heavily methylated than the newer strand.
I vaguely recall that some rare experimental systems have demonstrated the correction of mutations after replication of the mutation but cannot recall the specifics, and may be incorrect.