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수입산 관상어로부터 분리된 tetracycline 내성 Aeromonas spp에 tet (M) 및 tet (G) 유전자의 특성 분석
박신후 ( Shin Hoo Park ),전려진 ( Lyu Jin Jun ),조기택 ( Ki Taek Cho ),진지웅 ( Ji Woong Jin ),정현도 ( Hyun Do Jeong ) 한국수산과학회 2012 한국수산과학회지 Vol.45 No.3
In this study, the molecular structures of tet(M) and tet(G) carried by tetracycline (Tc) resistant bacteria in intestinal microflora from the imported ornamental fish were characterized and compared with each other depend on the imported countries. Of the total isolates, approximately 8.9% of the Ent-lac+ (lactose fermentative bacteria on coliform media) Tc resistant isolates in fish from three different countries, Singapore, Taiwan and Brazil, were appeared to contain tet (M). Three representative isolates of different countries, Aeromonas spp. JSM-1 (Singapore), JTM-1 (Taiwan) and JBM-1 (Brazil), were isolated and analyzed the molecular structures of tet (M) gene. Interestingly, partial sequence tet (M) genes (1099 bp) in JBM-1 (Brazil) showed 99.5% homology with the tet (M) found in the Vibrio spp. RV16 isolate, obtained from marine fish in Korea and known to carry Tn1545 parent type of tet (M). In contrast, tet (M) gene JSM-1 and JTM-1 showed mosaic structure of Tn1545 and Tn916, and 100% homology with each other. It may suggest the presence of various characteristics in terms of tet (M) gene structure. The determined sequence of the tet(G) from Aeromonas spp. JSG-1 and JBG-1 isolated from Singapore and Indonesia ornamental fish respectively showed similar nucleotide sequence homology but revealed a few nucleotide changes in comparison with the sequence of the prototype tet (G) gene (S52437 in GenBank).