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PCR and Electrophoresis
Techniques of Recombinant DNA Technology
Multiplying DNA in vitro: The Polymerase Chain Reaction (PCR)
VIDEO CLIP◦Large number of identical molecules of DNA
produced in vitro◦Critical to amplify DNA in variety of situations
Epidemiologists use to amplify genome of unknown pathogen
Amplified DNA from Bacillus anthracis spores in 2001 to identify source of spores
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Techniques of Recombinant DNA Technology
Multiplying DNA in vitro: The Polymerase Chain Reaction (PCR)◦Repetitive process consisting of three steps
Denaturation Priming Extension
◦Can be automated using a thermocycler
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Polymerase chain reaction (PCR)
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Figure 8.5a
Polymerase chain reaction (PCR)
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Figure 8.5b
Techniques of Recombinant DNA Technology
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Techniques of Recombinant DNA Technology
Separating DNA Molecules: Gel Electrophoresis and the Southern Blot◦Gel electrophoresis
Separates molecules based on electrical charge, size, and shape
Allows scientists to isolate DNA of interest Negatively charged DNA drawn toward positive electrode Agarose makes up gel; acts as molecular sieve Smaller fragments migrate faster and farther than larger
ones Determine size by comparing distance migrated to
standards
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Gel electrophoresis
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Figure 8.6
GEL ELECTROPHORESIS VIDEO
Video of our lab’s gel electrophoresisElectrophoresis Results video
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