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RECOMBINANT DNA TECHNOLOGY
PART 2
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Topics Genomic libraries
Id a specific clone or sequence within a library Transgenic plants Transgenic animals Timely topics
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Genomic library contains all of the organism’s genome
Probe design
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Bacterial clones and finding desired clone
Probe design
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A Final about vectors : There are many types
Small vectors Large vectors Expression vectors Viral vectors
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Transgenic Mice
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transgene Non-homologous recombination Linear DNA
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Knockout Mice
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G418 gancyclovir Homozygous knockout
Phenotype of the knockout mouse gives information on protein function
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Applications of DNA technology
Agriculture Drug design Genetic testing Gene therapy
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Genetic Modified Plants: “GM”
Tobacco with luciferase gene from firefly Transgenic plant
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Tumor Inducing Plasmid
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Model for making genetically modified (GM) plants
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GM crops Bt toxin genes (Bacillus thuringensis)
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Bt Toxin Cry toxins and cry genes: damages gut of larvae
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GM Plants Roundup ready plants: herbicide resistant
Herbicide known as: Glyphosate
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Glyphosate Enzyme inhibitor Prevents amino acid synthesis
Prevents weed growth Environmental concerns
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Antisense Technology 5´ C A U G 3´ mRNA 3´ G U A C 5´ Antisense RNA
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Anti-Sense Technology & FLAVR SAVRTM Tomato
Anti-sense DNA technology inhibits polygalacturonase (PG)
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The Flavr-Savr Tomato Ripens on the vine Preserves firmness and flavor
Uses anti-sense technology
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Cloning of a whole organism: Reproductive Cloning (you can read about this on page 601 of your book as well)
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SHEEP CELLS 54 27 Somatic Cell Germ Cell For ex. Mammary cell ovum
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How to process begins: 54 27 54 discarded Somatic Cell Germ Cell
For ex. Mammary cell ovum
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Now the germ cell contains 54 chromosomes!
The germ is stimulated “electrically”. Cell division in some instances begins. Individual is identical to host “DNA” donor. Aging affects? “Was Dolly a sheep in lamb’s clothing?”
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Somatic Gene Therapy
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Successes SCIDS (Severe Combined Immunodeficiency Disease)
Head and neck cancers
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But also failures and controversy
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