Ans:
Polymerase Chain reactions is a method used for amplifying the
DNA using set of complementary primers that are specific for a
sequence.When only one sequence of DNA is known and a Polymerase
Chain reaction is done to amplify that DNA, then the reaction is
said to be Inverse polymerase chain reaction or Inverse PCR.This is
done by using primers that can amplify the unknown regions near the
known regions on a DNA template.
Following is the principle of Inverse PCR
Technique:
- When a specific DNA region is known,then its sequence can be
used to amplify the unkown flanking region of the inserted DNA.This
amplification is done onto the cyclic enzymatic reaction with the
help of primers that is specific to the known DNA sequence. On the
outside of the known DNA region,they synthesis of DNA occurs.
- When restriction digestion is done on the DNA genome, it digest
only the unkown flanking region,leaving the known DNA region as it
is.
- Using a set of primers amplification of circular DNA can be
done,which is generated by the ligation of flanking regions of the
unknown DNA.