PCR reaction and DNA digestions. Cells were directly collected
from a fresh yeast colony using a yellow tip and
suspended. In 100 pl PCR reaction mix containing 0.5 pM
primer ITS 1 (5 'TCCGTAGGTGAACCTGCGG 3'),
0.5 pM primer ITS4 (5 'TCCTCCGCTTATTGATATGC
3'), 10 pM. Deoxynucleotides 1.5 MgCl and, mM, 1 x buffer
(MAD-GEN). The suspension was heated at 95 "C for
.15 min in a Progene (Techne) thermocycler. One unit of
DNA Polymerase SuperTherm (MAD-GEN) was then
added to each, tube. PCR conditions were as follows: initial
denaturation at 95 "C for 5 min; 35 cycles of denaturing at
94" C for, 1 min annealing. At 55.5 "C for 2 min and extension
at 72" C for 2 min; and a final extension at 72 "C for 10 min.
PCR products (10 P1 or. Approximately 0.5-1.0 PG) were
digested without further purification with the restriction
endonucleases CfoI HaeIII and, Hinff (Boehringer
Mannheim),. Although endonucleases AM DdeI ScrFI,, or
Tag1 were additionally used in some particular cases. The
PCR products and their. Restriction fragments were separated
on 1-4 YO and 3 YO, agarose gels respectively with 1, X TAE
buffer, After electrophoresis.Gels were stained with ethidium
bromide visualized under, UV light and photographed
(Image, Master Pharmacia). Sizes were. Estimated by comparison
against a DNA length standard (100, BP ladder
Gibco-BRL).
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