›› 2013, Vol. 40 ›› Issue (10): 216-220.

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Analysis of Transfer Modes of 16S rRNA Methylase in Chicken Intestinal E.coli

DING Xiao-li, CHEN Lin, HUANG Dong-zhang, LIU Jun-dong, WEI Dong-xia, GUAN Yuan-hong, LI Ju-yin, ZHOU Si-si, CHEN Xin-xiu   

  1. Jiangsu Agri-animal Husbandry Vocational College, Taizhou 225300, China
  • Revised:2013-06-19 Online:2013-10-20 Published:2013-12-19

Abstract: To study the transfer mode of rmtB and armA in chicken intestinal E.coli,plasmid conjugation experiment was carried out to study the horizontal transfer mode of rmtB and armA genes, and conjugative transfer frequencies were calculated. Broth microdilution method was applied to test susceptibility of 16S rRNA emthylase-positive isolates and their transconjugants to antimicrobial agents. As a result, all the rmtB genes located in five rmtB-positive isolates were easily transferred to recipients of E.coli C600. Conjugative transfer frequencies varied from 4.30×10-10 to 5.5×10-6 per recipient cell, and the armA gene located in one armA-positive isolate was not easily transferred to the recipient of E.coli C600. The results suggested that horizontal transfer was responsible for the dissemination of rmtB gene in chicken intestinal E.coli, but not for armA.

Key words: 16S rRNA methylase; plasmid; horizontal transfer; resistance

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