Biotechnology Dolly

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  • Slide 1
  • Biotechnology repairstemcell.files.wordpress.com Dolly
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  • Potential Uses for Cloned Genes to produce a protein product plasminogen activator to endow an organism with a metabolic capability engineered bacteria that degrade oil spills create more copies of the gene for further study
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  • Genetic Engineering Stages 1. Isolate gene cleavage of plasmid 2. Recombinant-DNA 3. Clone * Screen 4. Harvest Gene Protein
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  • 1. Isolate Gene Isolate the desired gene from the genome the desired gene will be cut with restriction endonucleases (enzymes) desired gene to be isolated
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  • Cleavage cut DNA of host with restriction endonucleases (enzymes) several hundred REs exist discovered 1960s produce sticky ends or blunt ends
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  • Sticky Ends Escherichia coli Eco RI sticky end
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  • Blunt ends Haemophilus aegyptius Hae III G G C C C C G G G G C C C C G G
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  • 2. Recombinant DNA splice desired gene into host DNA, DNA ligase seals the strands Vector, generally plasmid of bacteria (prok) or yeast (euk) viral DNA (not for harvesting protein) plasmid with recombinant DNA
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  • 3. Clone produce a cell line in which all members have identical copies of a particular gene Screen Choose cells that carry desired gene & eliminate those cells that do not carry desired gene
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  • 4. Harvest (or Isolate) harvest protein harvest gene genetic harvesting protein harvesting pest resistant gene oil eating bacteria dissolving clot protein human growth hormone copies of the gene protein molecules
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  • Cloning Directly from an organism complementary DNA made from mRNA template through reverse transcription (cDNA) Reverse transcriptase can be used to make smaller cDNA libraries These contain only the genes that are transcribed by a particular type of cell recognized by the addition of a RE recognition sequence to it reverse transcriptase plus mRNAs mRNAs mRNA is degraded by an enzyme DNA polymerase synthetizes the 2nd strand cDNA
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  • Genomic Libraries Book, a clone containing a foreign DNA Plasmid library (bacterial, yeast) Phage library (virus) Bacterial Artificial Chromosome library
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  • Plasmid Library Copies of DNA fragments can be stored in a cloned bacterial plasmid Each one of these is considered a "book" recombinant plasmid bacterial clones foreign genome
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  • Phage Library DNA fragments can be stored in a cloned phage each phage type is considered a "book" phage clones recombinant phage "book" foreign genome
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  • Bacterial Artificial Chromosome (BAC) Library Copies of multiple DNA fragments can be stored in a bacterial artificial chromosome plasmid with many genes BAC clone each clone occupies one well
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  • Gene products ProductMade in Use human insulinE. coli diabetes human growth hormoneE. coli growth defects epidermal growth factorE. coli burns, ulcers interleukin-2E. coli possibly cancer bovine growth hormoneE. coli improving weight gain cellulaseE. coli breakdown of cellulose TaxolE. coli ovarian cancer hepatitis B vaccineS. cerevisiae prevents hepatitis erythropoietinmammalian cells anemia factor VIIImammalian cells hemophilia tissue plasminogen activatormammalian cells heart attacks
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  • Other Examples "golden rice" genetically modified rich in beta-carotene prevents blindness news.bbc.co.uk
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  • papaya's ringspot disease gene was introduced to control the plague http://www2.dpi.qld.gov.au
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  • Human Genome Project Collaborative effort to map and sequence entire human genome Began 1990 4 goals genetic (linkage) mapping physical mapping sequencing analyzing the genomes of other species
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  • Genetic Mapping of the Human Genome to locate genetic markers spaced evenly throughout the chromosomes to make it easier to find other loci
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  • Physical Mapping of the Human Genome cutting chromosomes into identifiable fragments then determining their order on the chromosome
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  • Sequencing the Human Genome determining the exact nucleotide pairs haploid set of human chromosomes contains approximately 3 billion nucleotide pairs Genbank Database where DNA sequences have been deposited publically available via the Internet final draft, 2004 (over 99% of genome was determined) remain a few 100 gaps of unknown sequences that require special methods to figure out
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  • Analyzing Gene Expression Analyze genomes of other important species for genetic engineering
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  • Stem Cells unspecialized blastula cells pluripotent adult stem cells gives rise to specific types of cells bone marrow blood cells
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  • Applications Medical Diagnosis Human Gene therapy Pharmaceutical products animal and plant application gold rice salinity resistant gene Environmental biofuel oil cleaning bacteria Forensic evidence The Innocence Project conviction of guilty
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  • Genomes of other species and H. sapiens Bacteria H. influenzae1,7001995 E. coli4,4001997 Fungi S. cerevisiae6,2001996 Plants Oryza sativa (rice)60,0002002 Animals D. melanogaster13,7002000 Mus musculus 22,0002001 Rattus norvegius25,0002004 H. sapiens21,0002003
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  • Ethical Issues Should we engineer new genotypes for individuals with anomalies? diabetes, CF, immune deficiencies, MD, stunted growth, sickle-cell disease myopia, altering personalities, increase length of life
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  • Should we engineer human germ cells? If they are carrying abnormal genes eugenics - deliberate effort to control the genetic makeup of human populations color of eyes color of skin color of hair
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  • We have technology to test for diseases for which there is no cure and sometimes no treatment. (Ex. Huntingtons disease, breast cancer) Would you want to be tested?
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  • Who should have right to examine someones genetic info? How should that info be used? Should a persons genome be a factor in determining eligibility for a job or insurance The End