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Biology, 9th ed,Sylvia Mader

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Presentation on theme: "Biology, 9th ed,Sylvia Mader"— Presentation transcript:

1 Biology, 9th ed,Sylvia Mader
Chapter 16 Chapter 16 Biotechnology and Genomics Biotechnology and Genomics

2 Biology, 9th ed,Sylvia Mader
DNA Cloning: Chapter 16 Biotechnology and Genomics Gene Cloning is the production of genetically identical copies of DNA, cells, or organisms. Can be done to: ♦ Create many identical copies of the same gene (gene cloning) ♦ Genetically modify organisms in a beneficial way ● When used to modify a human it is called gene therapy. ● When used to modify another organism the new organisms created are called transgenic organisms.

3 DNA Cloning: Recombinant DNA Technology
Biology, 9th ed,Sylvia Mader DNA Cloning: Recombinant DNA Technology Chapter 16 Biotechnology and Genomics Recombinant DNA (rDNA) contains DNA from two or more different sources, such as a human cell and a bacterial cell This requires: 1. A vector This is a means to transfer foreign genetic material into a cell. Plasmids (small accessory rings of DNA from bacteria) are common vectors

4 Biology, 9th ed,Sylvia Mader
DNA Cloning: Plasmids Chapter 16 Biotechnology and Genomics There are many kinds of plasmids R plasmids carry genes for enzymes that destroy antibiotics: 1. Thus, bacteria that carry these plasmids and their genes are resistant to antibiotics ●This means they are not killed by the antibiotic. ● This is a serious problem for humans as more and more bacteria that cause human diseases are becoming resistant to our antibiotics

5 DNA Cloning: Recombinant DNA Technology
Biology, 9th ed,Sylvia Mader DNA Cloning: Recombinant DNA Technology Chapter 16 Biotechnology and Genomics Recombinant DNA technology A set of techniques for combining genes from different sources and then transferring the resulting rDNA into cells. Plasmids have been very useful in this endeavor Viruses have also been used for this purpose

6 DNA Cloning: Recombinant DNA Technology
Biology, 9th ed,Sylvia Mader DNA Cloning: Recombinant DNA Technology Chapter 16 Biotechnology and Genomics How to create recombinant DNA (rDNA)? 1. You must insert one organism’s DNA into the vector DNA 2. To do this you need the following: A restriction enzyme – which cleaves, or cuts, DNA A DNA ligase enzyme - seals DNA into the DNA of the vector

7 DNA Cloning: Restriction Enzymes
Biology, 9th ed,Sylvia Mader DNA Cloning: Restriction Enzymes Chapter 16 Biotechnology and Genomics Restriction Enzymes 1. These are “cutting” tools for making rDNA 2. They are actually bacterial enzymes called endonucleases. They are produced by bacteria to protect themselves from invading viral DNA They work by finding and chopping out the foreign DNA.

8 Restriction Enzyme Videos
Biology, 9th ed,Sylvia Mader Restriction Enzyme Videos Chapter 16 Biotechnology and Genomics Restriction Endonucleases

9 DNA Cloning: Restriction Enzymes
Biology, 9th ed,Sylvia Mader DNA Cloning: Restriction Enzymes Chapter 16 Biotechnology and Genomics How do restriction enzymes work? 1. They recognize short nucleotide sequences in the DNA and cut at very specific points 2. They produce staggered cuts which are called “sticky ends”. These single-stranded ends of DNA can base-pair with any other piece of DNA which was cut with the same restriction enzyme.

10 DNA Cloning: Restriction Enzymes
Biology, 9th ed,Sylvia Mader DNA Cloning: Restriction Enzymes Chapter 16 Biotechnology and Genomics

11 Biology, 9th ed,Sylvia Mader
Cloning a Human Gene Chapter 16 Biotechnology and Genomics

12 DNA Cloning: Creating Custom Bacteria
Biology, 9th ed,Sylvia Mader DNA Cloning: Creating Custom Bacteria Chapter 16 Biotechnology and Genomics Steps to make custom bacteria: 1. Obtain 2 kinds of DNA: a. Human DNA of interest Example: gene for human insulin b. Bacterial plasmid This will act as a vector to get human DNA into a bacterium

13 Biology, 9th ed,Sylvia Mader
Cloning a Human Gene Chapter 16 Biotechnology and Genomics

14 DNA Cloning: Creating Custom Bacteria
Biology, 9th ed,Sylvia Mader DNA Cloning: Creating Custom Bacteria Chapter 16 Biotechnology and Genomics 2. Treat plasmid and human DNA with the same restriction enzyme a. Pick a restriction enzyme that: • Cuts the plasmid in only ONE location (just to open up the plasmid) • Cuts the human DNA in just TWO spots ◊ Just in front of the gene for insulin ◊ Just behind of the gene for insulin

15 Biology, 9th ed,Sylvia Mader
Cloning a Human Gene Chapter 16 Biotechnology and Genomics

16 DNA Cloning: Creating Custom Bacteria
Biology, 9th ed,Sylvia Mader DNA Cloning: Creating Custom Bacteria Chapter 16 Biotechnology and Genomics 3. Mix the human DNA with the cut plasmid a. The sticky ends of the plasmid should base-pair with the complementary sticky ends of the human DNA b. Use DNA ligase to join the two DNA molecules together with covalent bonds c. The result is recombinant DNA

17 Biology, 9th ed,Sylvia Mader
Cloning a Human Gene Chapter 16 Biotechnology and Genomics

18 DNA Cloning: Creating Custom Bacteria
Biology, 9th ed,Sylvia Mader DNA Cloning: Creating Custom Bacteria Chapter 16 Biotechnology and Genomics 4. Mix the recombinant DNA plasmid with bacteria a. Given the right conditions, the bacteria take up the plasmid DNA by a process known as transformation 5. The bacteria then reproduce asexually and “clone” themselves. a. All of these cloned bacteria will have the gene for human insulin ◊ They will now produce insulin for us

19 DNA Cloning: Steps in Cloning a Gene
Biology, 9th ed,Sylvia Mader DNA Cloning: Steps in Cloning a Gene Chapter 16 Biotechnology and Genomics Steps in Cloning a Gene

20 Biology, 9th ed,Sylvia Mader
Cloning a Human Gene Chapter 16 Biotechnology and Genomics

21 Early Genetic Engineering Experiment
Biology, 9th ed,Sylvia Mader Early Genetic Engineering Experiment Chapter 16 Biotechnology and Genomics Early Genetic Engineering Experiment

22 DNA Cloning: How to get the gene for human insulin?
Biology, 9th ed,Sylvia Mader DNA Cloning: How to get the gene for human insulin? Chapter 16 Biotechnology and Genomics Gene given to the bacteria must NOT contain introns. How do you get intron free DNA? 1. Obtain cells from tissues that produce a lot of the desired protein a. In this case, get pancreatic cells 2. Isolate the mRNA from these cells that codes for insulin 3. Use the enzyme, reverse transcriptase, to make DNA from the mRNA. ◊ This is called complementary DNA, cDNA

23 DNA Cloning: cDNA Video
Biology, 9th ed,Sylvia Mader DNA Cloning: cDNA Video Chapter 16 Biotechnology and Genomics cDNA Video

24 DNA Cloning: Polymerase Chain Reaction (PCR)
Biology, 9th ed,Sylvia Mader DNA Cloning: Polymerase Chain Reaction (PCR) Chapter 16 Biotechnology and Genomics Technique to create copies of pieces of DNA quickly in a test tube. It is said to amplify a targeted sequence of DNA Allows thousands of copies to be made of small samples of DNA Requires: DNA polymerase A supply of nucleotides for the new DNA strands

25 DNA Cloning: Polymerase Chain Reaction (PCR)
Biology, 9th ed,Sylvia Mader DNA Cloning: Polymerase Chain Reaction (PCR) Chapter 16 Biotechnology and Genomics Steps of PCR technique: 1. DNA to be copied is mixed with heat- resistant versions of DNA polymerase and loose nucleotides a. These were discovered in the bacterium, Thermus aquaticus, which lives in hot springs. 2. High heat (> 94oC) is applied to test tube 3. H-bonds break & DNA splits 4. Cool down test tube; DNA replicates 5. Repeat steps over and over

26 Video Polymerase Chain Reaction (PCR)
Biology, 9th ed,Sylvia Mader Video Polymerase Chain Reaction (PCR) Chapter 16 Biotechnology and Genomics Polymerase Chain Reaction Video

27 Biology, 9th ed,Sylvia Mader
Chapter 16 PCR Biotechnology and Genomics

28 Applications of PCR: Analyzing DNA Segments
Biology, 9th ed,Sylvia Mader Applications of PCR: Analyzing DNA Segments Chapter 16 Biotechnology and Genomics DNA can be subjected to DNA fingerprinting Treat DNA segment with restriction enzymes This creates a unique collection of different fragments which differ from each other based on their lengths. (RFLPs = restriction fragment length polymorphisms) Gel electrophoresis separates the fragments according to their charge/size Produces distinctive banding pattern

29 Biology, 9th ed,Sylvia Mader
Gel Electrophoresis Chapter 16 Biotechnology and Genomics Gel electrophoresis is a method of physically sorting macromolecules (DNA or proteins) Steps of procedure: 1. Samples of DNA are placed in wells at one end of flat, rectangular gel 2. Gel is placed in an box with + and - electrodes at each end a. DNA, (-) charged, is placed at (-) end b. Electric current pulls the DNA thru gel towards the (+) electrode

30 Biology, 9th ed,Sylvia Mader
Gel Electrophoresis Chapter 16 Biotechnology and Genomics 3. As pieces of DNA move through the gel, they will separate according to their size: a. Smaller pieces move more quickly and end up traveling further through the gel b. Larger pieces will be bogged down in gel and not move as far in the same amount of time 4. You end up with “bands” in each lane of the gel. a. Each band represents a different size DNA

31 Restriction Length Fragment Polymorphisms Video
Biology, 9th ed,Sylvia Mader Restriction Length Fragment Polymorphisms Video Chapter 16 Biotechnology and Genomics Restriction Length Fragment Polymorphisms Video

32 DNA Fingerprinting & Paternity
Biology, 9th ed,Sylvia Mader DNA Fingerprinting & Paternity Chapter 16 Biotechnology and Genomics

33 Biology, 9th ed,Sylvia Mader
Gel Electrophoresis Chapter 16 Biotechnology and Genomics 5. If DNA from different people is run thru the same gel, differences and similarities can be studied 6. DNA fingerprinting is used to: a. Measure number of repeats of short sequences of DNA. People differ in the number of these repeats. b. Used in paternity suits, rape cases, corpse ID, identification of viral infections, identifying people with genetic disorders, detection of cancer, identification of trade in endangered species .

34 Biotechnology Products: Transgenic Bacteria
Biology, 9th ed,Sylvia Mader Biotechnology Products: Transgenic Bacteria Chapter 16 Biotechnology and Genomics Transgenic organisms have had a foreign gene inserted into their genetic make-up Transgenic bacteria now produce: Insulin, Human Growth Hormone, clotting factor VIII, hepatitis B vaccine Oil-Eating Bacteria Promote plant health (Ice-minus strawberries)

35 Genetically Engineered Bacteria
Biology, 9th ed,Sylvia Mader Genetically Engineered Bacteria Chapter 16 Biotechnology and Genomics

36 Biotechnology Products: Transgenic Plants and Animals
Biology, 9th ed,Sylvia Mader Biotechnology Products: Transgenic Plants and Animals Chapter 16 Biotechnology and Genomics Transgenic Plants have been created to produce: Pest resistant agricultural crops Human hormones Transgenic Animals Many types of animal eggs have taken up the gene for bovine growth hormone (bGH) The procedure has been used to produce larger fishes, cows, pigs, rabbits, and sheep

37 Biotechnology Products: Transgenic Plants and Animals
Biology, 9th ed,Sylvia Mader Biotechnology Products: Transgenic Plants and Animals Chapter 16 Biotechnology and Genomics Gene Pharming: Use of transgenic farm animals to produce pharmaceuticals Genes coding for therapeutic & diagnostic proteins are incorporated into an animal’s DNA The proteins appear in the animal’s milk Plans are to produce drugs to treat: Cystic fibrosis Cancer Blood diseases, etc.

38 Biology, 9th ed,Sylvia Mader
Transgenic Mammals Chapter 16 Biotechnology and Genomics

39 Biology, 9th ed,Sylvia Mader
Human Genome Project Chapter 16 Biotechnology and Genomics Genome - All the genetic information of an individual (or species) Goals of Human Genome Project: Determine the base pair sequence of human DNA Launched in 1990; completed a working draft in 2003 Construct a map showing sequence of genes on specific chromosomes (approximately 25,000 genes code for proteins) Other species sequences are being determined.

40 Biology, 9th ed,Sylvia Mader
Gene Therapy Chapter 16 Biotechnology and Genomics The insertion of genetic material into human cells for the treatment of a disorder Ex Vivo Gene Therapy ◊ Genes combined outside of body and then placed inside Examples: - Children with Severe Combined Immunodeficiency injected with modified bone marrow stem cells

41 Biology, 9th ed,Sylvia Mader
Chapter 16 Gene Therapy Biotechnology and Genomics

42 Biology, 9th ed,Sylvia Mader
Gene Therapy Chapter 16 Biotechnology and Genomics • In Vivo Gene Therapy ◊ Genes inserted in human body, via nasal sprays, viruses, or liposomes Examples: - Cystic Fibrosis treatments - Cancer therapies

43 Biology, 9th ed,Sylvia Mader
Chapter 16 Biotechnology and Genomics See Human Genome Project PowerPoint Presentation

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