2.2.1. Extraction of genomic DNA
DNA was isolated using a universal genomic DNA extraction kit
(Takara) following the recommendations of the manufacturer. Then
the quality and concentration of DNA were assessed by 1.0% agarose
gel electrophoresis and Cintra 5 UV–visible spectrophotometer (GBC
Scientific Equipment), respectively.
2.2.2. Isolation of total RNA and cDNA synthesis
Total RNA was extracted using the Trizol method (Chomczynski
and Sacchi, 1987), and quantified by a spectrophotometer. Then cDNA
templates were generated from the total RNA using the reverse transcription
kit (SuperScript III First-Strand Synthesis System for RT-PCR,
Invitrogen) and following the manufacturer's protocol.