PCR was performed in 25 ml reaction volume containing 20 ng
of DNA template, 5 mM MgCl2, 1 mM dNTPs, 0.2 mM of each
primer, 2.5 ml 10X buffer and 1.5 U of Taq polymerase (Invitrogen
Life Technologies, Brazil) on GeneAmp1 PCR system 9700 (Applied
Biosystems). The PCR conditions were: initial denaturation at 94 8C
for 5 min followed by 35 cycles of denaturation (94 8C for 30 s),
annealing (57 8C for 30 s for primer set I and 54 8C for 30 s for
primer set II) and extension (72 8C for 30 s) with a final extension of
72 8C for 5 min followed by 4 8C hold. The amplified fragments
were visualized on 2% agarose gel using ethidium bromide stain
(0.5 mg/ml). The generated amplicons were cycle sequenced using
BigDye1 Terminator v3.1 cycle sequencing kit (Applied Biosystems,
Foster City, CA). DNA sequencing was performed on 3100
Avant Genetic Analyzer (Applied Biosystems).
Validation studies: The technique was validated with respect to
the following points.