The single nucleotide polymorphism (SNP) of aldehyde dehydrogenase-2 (ALDH2) codon 487, GAA (Glu) or AAA (Lys), was examined using green fluorescent protein (GFP)-display, an electrophoretic detection method for single amino acid changes. Although no shift in migration between the GFP-ALDH (Glu487) and GFP-ALDH (Lys487) fusion proteins was observed on SDS/urea gel, the two migrated to different positions when tagged with Asp. The SNP analysis was performed with GFP-ALDH-Asp3, and GFP-ALDH-Asp3 constructed from donors having the codon GAA/GAA, GAA/AAA or AAA/AAA was detected as different patterns as expected. GFP-display is potentially a unique method in SNP analysis, which does not require any special equipment or chemicals.
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