PCRs for dCAPS analyses of the G/T polymorphism in
intron 1 were carried out in 20 μl using GoTaq DNA
Polymerase (Promega) supplemented with 5% DMSO
and with 20 ng of genomic DNA, 1 μM of GBSS-W2F,
1 μM of GBSS-W2R (Ayres et al. 1997; Chen et al.
2008). Amplification conditions were: 94°C per 4 min
followed by 40 cycles of 94°C per 40 sec, 60°C per 50 sec
and 72°C per 1 min per kb and a final extension of 72°C
per 10 min. After amplification 5 μl of PCR products
were digested with 1 U of AccI restriction enzyme (New
England BioLabs) in a total volume of 10 μl at 37°C over
night. The samples were run on 2% agarose gel. Each
digested sample was compared alongside with its notdigested
cognate control.