DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule. This process is fundamental to cell division and the transmission of genetic information from one generation to the next.
An enzyme that unwinds the DNA double helix at the replication fork, separating the two strands to create single-stranded DNA templates.
Adds nucleotides to the growing DNA strand, complementary to the template strand. It also proofreads and corrects errors.
Synthesizes short RNA primers that provide a starting point for DNA polymerase to begin adding nucleotides.
Each new DNA molecule consists of one original (conserved) strand and one newly synthesized strand.
Origin of replication is recognized, helicase binds and begins unwinding the DNA.
Primase lays down RNA primers, DNA polymerase extends new strands in 5' to 3' direction. Leading strand synthesizes continuously; lagging strand synthesizes in Okazaki fragments.
Replication forks meet, RNA primers are replaced with DNA, fragments are joined by ligase.
Polymerase Chain Reaction uses DNA replication principles to amplify DNA for research and diagnostics.
Understanding replication errors helps explain mutations and develop targeted cancer therapies.
Manipulating DNA replication enables gene editing, cloning, and biotechnology applications.
DNA replication techniques allow analysis of tiny samples for identification purposes.