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- W2022157751 abstract "Reannotation of the pathogenic Mycoplasma gallisepticum strain Rlow genome identified the hypothetical gene MGA_0329 as a homolog of the sialidase gene MS53_0199 of Mycoplasma synoviae strain MS53. Potent sialidase activity was subsequently quantitated in several M. gallisepticum strains. Because sialidase activity levels correlate significantly with differing M. synoviae strain virulence, we hypothesized this enzyme may also influence the virulence of M. gallisepticum. MGA_0329 was disrupted in strain Rlow to create mutants 6, 358 and P1C5, which resulted in the loss of sialidase activity in all three mutants. Chickens infected with the knockout mutants had significantly less severe (P < 0.05) tracheal lesions and tracheal mucosal thickening than chickens infected with equal doses of strain Rlow. Significantly fewer (P < 0.05) CCU especially of strains 6 and P1C5 were recovered at necropsy. Mini-Tn4001tet plasmid pTF20 carrying a wild-type copy of MGA_0329 with its native promoter was used to complement the genetic lesion in strain P1C5. Three clones derived from P1C5, each having one copy of MGA_0329 stably transposed into a different site in its genome, expressed sialidase restored to wild-type activity levels (1.58 × 10−8 U/CFU). Complementation of P1C5 with MGA_0329 did not restore it to wild-type levels of virulence, indicating that the contribution of sialidase to M. gallisepticum virulence is not straightforward." @default.
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- W2022157751 date "2012-05-01" @default.
- W2022157751 modified "2023-09-23" @default.
- W2022157751 title "Effects of sialidase knockout and complementation on virulence of Mycoplasma gallisepticum" @default.
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- W2022157751 doi "https://doi.org/10.1016/j.vetmic.2011.12.004" @default.
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