By comparing the cDNA sequence of the
Wx-D1b allele with genomic DNA sequence, two
specific primers were designed to amplify a specific
region of the Wx-D1 gene. This region covers the 588
bp deletion and 12 bp insertion of the mutant allele.
PCR was carried out using two specific primers (D1:
5′-GAGATGGTCAAGAACTGCAT-3′; D2: 5′-TAGTGCGTCCAGACTCACAG-3′)
as described by
Vrinten et al [10]. Another two specific primers located
inside D1 and D2, D3: 5 ′-TGGTGCTCTTGTTCGATGT-3′
and D4: 5′-AGACTCACAGTTTAACAGCA-3′,
were designed, respectively. Amplification
reactions were performed with pre-denaturation at
94℃for 10 min, followed by 28 cycles of denaturation
at 94℃ for 1 min, annealing at 56℃ for 1 min,
and extension at 72℃ for 1 min. A final extension
was carried out at 72℃ for 5 min.