(1995). After the preamplification reaction, the reaction mixture was diluted to 150 μl with double distilled
H2O (dd H2O). The 10 μl PCR selective amplification system contained 1 μl of product from the diluted preamplification
reaction, 25 ng of both selective primers, 0.3 units of Taq DNA polymerase, 0.2 mM of each dNTP, 1.5 mM MgCl2 1X PCR buffer. All amplification reactions were performed in a Touch gene model thermocycler (Techne). Initially, three individuals from three studied strains were chosen to test the variation of 66 primer combinations (data not shown). With these individuals the polymorphism rates and the total number of bands with the 66 primer combinations were evaluated. The most useful primer combinations were considered those having the highest polymorphism rate that also
generate a reasonable number of clearly detectable
total fragments. Using results from the evaluation of
66 primer combinations based on 3 individuals, the ten
most-polymorphic primer combinations, producing
clearly readable bands, were selected for the subsequent
analyses with at least 30 samples.
Gel analysis: An equal volume of loading buffer
(Formamide 10 ml, Xylene cyanol FF 10 mg,
Bromophenol blue 10 mg, 0.5 M EDTA pH 8.0 200 μl)
was added to each sample, and denatured at 95°C for 3
min then placed on ice for 2 min before loading. 4 μl of
samples loaded onto 6% denaturing polyacrylamide gel
matrix (7 M Urea; 19:1 Acrylamide: bis; 1X TBE
buffer). The electrophoresis parameters were set to 75
Watt, 50°C and a run time of 1.5 hours was selected.
Bands detected by the silver staining procedure
(Promega, Technical manual No.023) and gel images
were scanned and saved as jpeg files for scoring and further
analysis. Two typical gels are shown in Figure 1a,b.
(1995). After the preamplification reaction, the reaction mixture was diluted to 150 μl with double distilledH2O (dd H2O). The 10 μl PCR selective amplification system contained 1 μl of product from the diluted preamplificationreaction, 25 ng of both selective primers, 0.3 units of Taq DNA polymerase, 0.2 mM of each dNTP, 1.5 mM MgCl2 1X PCR buffer. All amplification reactions were performed in a Touch gene model thermocycler (Techne). Initially, three individuals from three studied strains were chosen to test the variation of 66 primer combinations (data not shown). With these individuals the polymorphism rates and the total number of bands with the 66 primer combinations were evaluated. The most useful primer combinations were considered those having the highest polymorphism rate that alsogenerate a reasonable number of clearly detectabletotal fragments. Using results from the evaluation of66 primer combinations based on 3 individuals, the tenmost-polymorphic primer combinations, producingclearly readable bands, were selected for the subsequentanalyses with at least 30 samples.Gel analysis: An equal volume of loading buffer(Formamide 10 ml, Xylene cyanol FF 10 mg,Bromophenol blue 10 mg, 0.5 M EDTA pH 8.0 200 μl)was added to each sample, and denatured at 95°C for 3min then placed on ice for 2 min before loading. 4 μl ofsamples loaded onto 6% denaturing polyacrylamide gelmatrix (7 M Urea; 19:1 Acrylamide: bis; 1X TBEbuffer). The electrophoresis parameters were set to 75Watt, 50°C and a run time of 1.5 hours was selected.Bands detected by the silver staining procedure(Promega, Technical manual No.023) and gel imageswere scanned and saved as jpeg files for scoring and furtheranalysis. Two typical gels are shown in Figure 1a,b.
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