Golden Key Points – Chapter 9-BIOTECHNOLOGY : PRINCIPLES AND PROCESSES

Golden Key Points

1. Biotechnology Overview:

   • Definition: Use of living organisms or their products to develop useful products and processes.
   • Techniques include genetic engineering, bioprocess engineering, and various biotechnological processes.
   • Examples: Microbe-mediated processes like making curd, bread, or wine, as well as modern molecular techniques like gene cloning and DNA vaccines.

2. Principles of Biotechnology:

   • Core Techniques:
     • Genetic Engineering: Alters DNA/RNA to change the phenotype of organisms.
     • Bioprocess Engineering: Maintains sterile conditions for large-scale growth of desired microbes.
   • Importance of these techniques in biotechnological advancements.

3. Tools of Recombinant DNA Technology:

   • Key Tools:
     • Restriction Enzymes: Cut DNA at specific sequences.
     • Polymerase Enzymes: Synthesize DNA strands.
     • Ligases: Join DNA fragments.
     • Vectors: Carry foreign DNA into host cells.
   • Importance of these tools in genetic engineering and creating recombinant DNA.

4. Restriction Enzymes:

   • Function: Cut DNA at specific recognition sequences.
   • Types: Exonucleases (remove nucleotides) and endonucleases (cut at specific positions).
   • Use in creating sticky ends for DNA ligation and forming recombinant DNA molecules.

5. Cloning Vectors:

   • Purpose: Carry foreign DNA into host cells for replication.
   • Features: Origin of replication (ori), selectable markers, cloning sites.
   • Examples: Plasmids, bacteriophages, Ti plasmids for plants, retroviruses for animals.

6. Competent Host and DNA Insertion:

   • Making cells competent for DNA uptake.
   • Methods of DNA insertion: Transformation, transfection, micro-injection, biolistics.
   • Importance of selectable markers in identifying transformed cells.

7. Processes of Recombinant DNA Technology:

   • Steps: Isolation of DNA, restriction enzyme digestion, DNA ligation, transformation.
   • Importance of each step in creating recombinant DNA and transferring it into host cells.

8. Amplification of Gene using PCR:

   • Polymerase Chain Reaction (PCR): Amplifies DNA segments in vitro.
   • Use of primers and DNA polymerase to create multiple copies of a gene.
   • Importance in creating sufficient DNA for cloning and other applications.

9. Obtaining Foreign Gene Product:

   • Expression of foreign genes in host cells.
   • Large-scale production methods using bioreactors.
   • Importance of downstream processing for purification, formulation, clinical trials, and quality control testing.

10. Downstream Processing:

    • Definition: Series of processes post-biosynthesis to prepare the product for market.
    • Processes: Separation, purification, formulation, clinical trials, quality control testing.
    • Importance in ensuring product safety, efficacy, and quality before marketing.