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Genetic Engineering

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  1. Genetic Engineering Aulanni’amBiochemistry LaboratoryChemistry DepartmentBrawijaya

  2. What is genetic engineering? The transfer of genes (segment of DNA) from one species to another. This is impossible in naturally breeding.

  3. How to get the gene from species A to species B? A vector is used to carry the gene into the host nucleus.

  4. What are vectors commonly used in GE? • Plasmid (of bacteria) • Viruses • Shotgun technique (blindly shoots tiny particles coated with the gene into the host cells)

  5. What is a plasmid?

  6. Natural role of a plasmid in bacteria? • Plasmids usually contain one or two gene that confer a selective advantage on the bacterium e.g. antibiotic resistance gene. • Every plasmid possess a replicator gene can duplicated independently from the chromosomal DNA.

  7. 1&2 : antibiotic resistance genes 3: replicator gene

  8. Recombinant DNA technology • Cut insulin production gene from a human DNA • Paste it into the DNA of Escherichia coli • The E. coli reproduces rapidly to produce large numbers: gene cloning

  9. restriction enzyme In bacteria, restriction enzymes are found naturally. They cut DNA at specific sites.

  10. DNA double helixes are cut at the axis of symmetry:

  11. Cut insulin gene from human cell (by adding restriction enzyme) Cut plasmid (by adding restriction enzyme) adding ligase enzyme Insulin gene has been inserted into the plasmid

  12. Place the recombinant plasmids back into the bacteria Leave the bacteria to grow and multiply

  13. How do I know which bacteria will have the plasmid? • Add specific antibiotics to the agar culture • All those bacteria which do not have the plasmid will die • Only those with the recombinant plasmids can grow and multiply

  14. Application of GE: • Medical • GM Food • Industrial production • Environmental protection

  15. Medical • Production of pharmaceuticals for treatment of diseases e.g. human insulin, interferons • Production of pharmaceuticals for disease prevention e.g. vaccine (hepatitis B vaccine)

  16. Medical • Gene therapy: Artificially replace the disease-causing gene with a normal allele. The normal allele can be carried by a virus vector to the target tissues. e.g. treatment of cystic fibrosis

  17. Medical • Clonal propagation: a source of tissue or organ for transplantation avoid all problems of immunoincompatibility.

  18. Agricultural • Transgenic plants and farm animals pest-resistant (reduce use of pesticides), increase yield • Increase storage time • e.g. green tomato • tomato with beef genes

  19. Industrial: • Use of GM microorganisms to make stone-wash jeans • Use of GM microorganisms to produce enzymes e.g. detergents

  20. Environmental protection • GM E. coli possesses gene to break down cellulose, speeding up recycling of the most abundant biomass on earth • GM microorganisms with enhanced ability to break down environmental pollutants

  21. Dispute in the development of GM • Dangerous pathogens formed in the course of rDNA • New tools for militarists and terrorists • Triggering of catastrophic ecological imbalance • Moral problems in the use of GM techniques in man e.g. germ cell gene therapy • Unknown effect of GM food on men