this week
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This Week. Score Conjugation Plates, Start High Frequency of Recombination (HFR) experiment, Continue Nasonia experiment. H igh F requency of R ecombination (Hfr). ...bacteria exhibiting a high frequency of recombination , - PowerPoint PPT PresentationTRANSCRIPT
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This Week
• Score Conjugation Plates,
• Start High Frequency of Recombination (HFR) experiment,
• Continue Nasonia experiment.
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High Frequency of Recombination(Hfr)
...bacteria exhibiting a high frequency of recombination,
– an alteration DNA sequence such that the genotype of subsequent individuals differs from the parent,
…specifically, strains with a chromosome integrated F factor that is able to mobilize and transfer part of the chromosome to the F- cell.
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Hfr Cells
F factor
Bacterial Chromosome
Inserted F plasmid
...F factor integration site,
...host (bacteria chromosome) integration site.
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F Pilus Attaches to F- Cell
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Hfr DNA is Cut
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F factor and Chromosomal DNA are Transferred
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Recombination Requires Crossing over
Double Crossover
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DNA not Incorporated into Chromosome are Digested
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F factor inserts in different regions of the bacterial chromosome,
Also inserts in different orientations.
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Origin of Replication
Hfr Order of transferstrain
H thr azi ton lac pur gal his gly thi 1 thr thi gly his gal pur lac ton azi 2 lac pur gal his gly thi thr azi ton 3 gal pur lac ton azi thr thi gly his
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F factor
Hfr F-
A
a
Indicates direction of transfer.
A
A
a
Hfr DNA that is not incorporated in the F- strand, and DNA that has crossed out of the F- strand is
digested.
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F factor
Hfr F-
A
Leading Gene: the first gene transferred is determined empirically.
A
Hfr
A
F-A
A transfers first.
A transfers last.
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Hfr Order of transferstrain
H thr azi ton lac pur gal his gly thi 1 thr thi gly his gal pur lac ton azi 2 lac pur gal his gly thi thr azi ton 3 gal pur lac ton azi thr thi gly his
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E. coli Map
• 0 minutes is at the threonine,
• 100 minutes is required to transfer complete genome,
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lac (7)
car::tn10 (0.6)tetR
car (0.6)tetS
rpoB- (90)rifR
rpoB+ (90)rifS
metB- (89)
metB+ (89)
cysG- (72) cysG+ (72)
gyrA- (48)
nalS
gyrA+ (48)
nalR
1st Selection: tetR, nalR
pp. 3 assignmentdue 5/28/2008
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lac (7)
car::tn10 (0.6)tetR
car (0.6)tetS
rpoB- (90)rifR
rpoB+ (90)rifS
metB- (89)
metB+ (89)
cysG- (72) cysG+ (72)
gyrA- (48)
nalS
gyrA+ (48)
nalR
1st Selection: tetR, nalR
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Plate A proline, arginine, uracil
Plate B proline, arginine, uracil,methionine
Plate C proline, arginine, uracil,cysteine
Plate D proline, arginine, uracil,methionine, cysteine
Supplements Marker Selectedmet, cys
cys
met
no selection
Selection Scheme
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lac (7)
car::tn10 (0.6)tetR
car (0.6)tetS
rpoB- (90)rifR
rpoB+ (90)rifS
metB- (89)
metB+ (89)
cysG- (72) cysG+ (72)
gyrA- (48)
nalS
gyrA+ (48)
nalR
Met +, Cys + Met +, Cys - Met -, Cys +Met -, Cys -
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Met+ Cys+ Plates: A __ B __ C __ D __
lac (7)
car::tn10 (0.6)tetR
car (0.6)tetS
rpoB- (90)rifR
rpoB+ (90)rifS
metB- (89)
metB+ (89)
cysG- (72) cysG+ (72)
gyrA- (48)
nalS
gyrA+ (48)
nalR
Met+ Cys- Plates: A __ B __ C __ D __Met- Cys+ Plates: A __ B __ C __ D __Met- Cys - Plates: A __ B __ C __ D __
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lac (7)
car::tn10 (0.6)tetR
car (0.6)tetS
rpoB- (90)rifR
rpoB+ (90)rifS
metB- (89)
metB+ (89)
cysG- (72) cysG+ (72)
gyrA- (48)
nalS
gyrA+ (48)
nalR
Met+, Cys+ Plates: A __ B __ C __ D __
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lac (7)
car::tn10 (0.6)tetR
car (0.6)tetS
rpoB- (90)rifR
rpoB+ (90)rifS
metB- (89)
metB+ (89)
cysG- (72) cysG+ (72)
gyrA- (48)
nalS
gyrA+ (48)
nalR
Met_, Cys+ Plates: A __ B __ C __ D __
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lac (7)
car::tn10 (0.6)tetR
car (0.6)tetS
rpoB- (90)rifR
rpoB+ (90)rifS
metB- (89)
metB+ (89)
cysG- (72) cysG+ (72)
gyrA- (48)
nalS
gyrA+ (48)
nalR
Met_, Cys- Plates: A __ B __ C __ D __
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lac (7)
car::tn10 (0.6)tetR
car (0.6)tetS
rpoB- (90)rifR
rpoB+ (90)rifS
metB- (89)
metB+ (89)
cysG- (72) cysG+ (72)
gyrA- (48)
nalS
gyrA+ (48)
nalR
Met+, Cys- Plates: A __ B __ C __ D __