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How does recombinant DNA technology combine genetic material from different organisms?
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recombinant DNA
The process of DNA extraction is necessary to isolate molecules of DNA from cells or tissues. A series of steps, including the use of protease enzymes to strip proteins from the DNA, are required for isolating pure DNA that is suitable for use in later procedures, such as cloning or sequencing.
Recombinant DNA technology combines genetic material from different organisms by using specific enzymes to cut and splice DNA molecules, creating sequences that do not occur naturally. The process generally follows these steps:12
- Cleaving DNA: Researchers use restriction enzymes, often called "molecular scissors," to cut both the donor DNA (containing the target gene) and a vector (such as a plasmid) at specific recognition sites. Many of these enzymes create staggered cuts, leaving single-stranded "overhangs" that are complementary to one another.32
- Splicing: When the cut donor DNA and vector are mixed, these complementary overhangs pair together. An enzyme called DNA ligase is then applied to seal the sugar-phosphate backbone, creating a stable, continuous recombinant DNA molecule.2
- Transformation and Amplification: The recombinant molecule is introduced into a host organism, typically bacteria, through a process called transformation. Once inside, the host cell replicates the recombinant DNA as it divides, producing many copies of the inserted genetic material.24
This technology allows scientists to isolate, manipulate, and study specific genes across different species for applications in medicine, agriculture, and industry.15