Characterization and cross-protection evaluation of M949_1603 gene deletion Riemerella anatipestifer mutant RA-M1

文献类型： 外文期刊

第一作者： Zou, Jiechi

作者： Zou, Jiechi;Wang, Xiaolan;Ding, Chan;Tian, Mingxing;Han, Xiangan;Wang, Shaohui;Yu, Shengqing

作者机构：

关键词： Riemerella anatipestifer;Lipopolysaccharide;Cross-protection;Vaccine candidate

期刊名称：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY （ 影响因子：4.813； 五年影响因子：4.697 ）

ISSN：

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收录情况： SCI

摘要： Riemerella anatipestifer infection causes high mortality for ducks which results in major economic losses in the duck industry. In this study, we identified a mutant strain RA-M1 by Tn4351 transposon mutagenesis, in which the M949_1603 gene encoding glycosyl transferase was inactivated. PCR analysis revealed that M949_1603 gene is specifically existed in R. anatipestifer serotype 1 strains. RA-M1 presented no reactivity to the anti-lipopolysaccharide (LPS) MAb in an indirect ELISA. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) followed by Western blotting demonstrated that RA-M1 LPS had a deficiency in ladder-like binding pattern to rabbit antiserum against R. anatipestifer serotype 1 strain CH3, indicating that the O-antigen structure of RA-M1 was changed. RA-M1 showed significant attenuated virulence in ducks and higher sensitivity to normal duck serum, compared with its parent strain CH3. Furthermore, cross-protection of RA-M1 for R. anatipestifer serotypes 1, 2, and 10 strains was evaluated. Ducks that received two immunizations with inactivated RA-M1 vaccine were 100 % protected from challenge with R. anatipestifer serotype 1 strain WJ4, serotype 2 strain Yb2, and serotype 10 strain HXb2. No changes were observed in the liver, heart, or spleen samples from the protected ducks during autopsy and histological examination. Furthermore, vaccination generated high antibody titers of 1:12,800 against serotypes 1, 2, and 10 strains and enhanced production of interleukin 2 (IL-2) and IL-4 in ducks. These results suggested that M949_1603 gene is associated with serotype 1 O-antigen biosynthesis, and mutant RA-M1 could be used as a novel cross-protection vaccine candidate to protect ducks against R. anatipestifer infection.

分类号： Q939.9`Q81

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