Biotechnology Principles — Core Principles
Core Principles
Biotechnology Principles revolve around genetic engineering, the direct manipulation of an organism's genes. The core technology is Recombinant DNA (rDNA) technology, which involves combining DNA from different sources.
Key steps include isolating DNA, cutting it with restriction enzymes (molecular scissors) at specific sites to create sticky ends, amplifying the gene of interest using PCR, and then joining this gene into a cloning vector (like a plasmid) using DNA ligase (molecular glue).
This recombinant DNA is then introduced into a competent host cell (transformation). Finally, transformed cells are selected using selectable markers (e.g., antibiotic resistance) and screened (e.g., by insertional inactivation) to identify those containing the desired recombinant DNA.
The host cells are then grown in bioreactors to express the foreign gene and produce the desired protein. This technology has vast applications in medicine (insulin production, vaccines), agriculture (GM crops), and industry.
Important Differences
vs Traditional Breeding
| Aspect | This Topic | Traditional Breeding |
|---|---|---|
| Specificity | Highly specific, targets individual genes. | Non-specific, transfers entire sets of genes, including undesirable ones. |
| Gene Transfer | Can transfer genes across species (inter-specific) or even kingdoms (transgenic organisms). | Limited to sexually compatible species. |
| Time Required | Relatively fast, results can be seen in a single generation. | Slow, requires multiple generations of crosses and selection. |
| Control | Precise control over the genes being introduced or modified. | Less control, relies on random recombination and natural selection. |
| Outcome | Creation of novel combinations of genes, leading to new traits not found naturally. | Enhancement of existing traits within a species or closely related species. |