

FOLLOWUS
1. State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences
2. University of Chinese Academy of Sciences
3. College of Fisheries Jimei University
网络首发:2016-12-01,
纸质出版:2017
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Involvement of two glycoside hydrolase family 19 members in colony morphotype and virulence in Flavobacterium columnare[J]. 海洋湖沼学报(英文), 2017,35(6):1511-1523.
Zhang, X., Li, N., Qin, T. et al. Involvement of two glycoside hydrolase family 19 members in colony morphotype and virulence in Flavobacterium columnare., Chin. J. Ocean. Limnol. 35, 1511–1523 (2017). https://doi.org/10.1007/s00343-017-6160-z
Involvement of two glycoside hydrolase family 19 members in colony morphotype and virulence in Flavobacterium columnare[J]. 海洋湖沼学报(英文), 2017,35(6):1511-1523. DOI: 10.1007/s00343-017-6160-z.
Zhang, X., Li, N., Qin, T. et al. Involvement of two glycoside hydrolase family 19 members in colony morphotype and virulence in Flavobacterium columnare., Chin. J. Ocean. Limnol. 35, 1511–1523 (2017). https://doi.org/10.1007/s00343-017-6160-z DOI:
Flavobacterium columnare is the pathogenic agent of columnaris disease in aquaculture. Using a recently developed gene deletion strategy
two genes that encode the Glyco_hydro_19 domain (GH19 domain) containing proteins
ghd-1 and ghd-2
were deleted separately and together from the F. columnare G4 wild type strain. Surprisingly
the single-
Δghd-1 and Δghd-2
and double-gene mutants
Δghd-1 Δghd -2
all had rhizoid and non-rhizoid colony morphotypes
which we named Δghd-1
Δghd-2
Δghd-1 Δghd-2
and NΔghd-1
NΔghd-2
and NΔghd-1 Δghd-2. However
chitin utilization was not detected in either these mutants or in the wild type. Instead
skimmed milk degradation was observed for the mutants and the wild type; the non-rhizoid strain NΔghd-2 exhibited higher degradation activity as revealed by the larger transparent circle on the skimmed milk plate. Using zebrafish as the model organism
we found that non-rhizoid mutants had higher LD50 values and were less virulent because zebrafish infected with these survived longer. Transcriptome analysis between the non-rhizoid and rhizoid colony morphotypes of each mutant
i.e.
NΔ ghd -1 versus (vs) Δghd-1
NΔghd-2 vs Δghd-2
and NΔghd-1 Δghd-2 vs Δghd-1 Δghd-2
revealed a large number of differentially expressed genes
among which 39 genes were common in three of the pairs compared. Although most of these genes encode hypothetical proteins
a few molecules such as phage tail protein
rhs element Vgr protein
thiol-activated cytolysin
and TonB-dependent outer membrane receptor precursor
expression of which was down-regulated in non-rhizoid mutants but up-regulated in rhizoid mutants
may play a role F. columnare virulence.
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