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PCR The polymerase chain reaction. Crick and Watson – structure of DNA.

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Presentation on theme: "PCR The polymerase chain reaction. Crick and Watson – structure of DNA."— Presentation transcript:

1 PCR The polymerase chain reaction

2 Crick and Watson – structure of DNA

3 A double helix with two antiparallel strands

4 “It has not escaped our notice that the specific pairing we have postulated immediately suggests a copying mechanism for the genetic material.”

5 Ends 5’ end 3’end 5’ end

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9 My gene: 5’TCACGACGTTGTAAAACGACGTCTATACCGAGCTCCTCTCTCTCTCATAGCTGTTTCCTGTGTGAA3’ I design custom oligonucleotides to the “sense” strand at the beginning and the “antisense” at the end Sense 5’TCACGACGTTGTAAAACGACGTCTATACCGAGCTCCTCTCTCTCTCATAGCTGTTTCCTGTGTGAA3’ Anti 3’AGTGCTGCAACATTTTGCTGCAGATATGGCTCGAGGAGAGAGAGAGTATCGACAAAGGACACACTT5’ “forward primer” 5’TCACGACGTTGTAAAACGACG3’ “reverse primer” 3’GTATCGACAAAGGACACACTT5’

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13 http://www.people.virginia.edu/~rjh9u/pcranim.html

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16 DNA hybridization rate is altered by changing Temperature: template dependent Salt Concentration: can be standardized DNA concentration: can be standardized Time: can be standardized

17 Thermal cycler Peltier effect heating / cooling block Heated lid (prevents evaporation problems) 96 well plate format Microprocessor controlled thermal program

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22 Real-time PCR Quantitative Fast High sample processing speed Very sensitive

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24 Parasitic Worm Inoculation Levels Violet= 200 worms per root Red = 50 worms per root Blue= 20 worms per root


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