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Genome and secretome analysis of Pochonia chlamydosporia provide new insight into egg-parasitic mechanisms.

Abstract：

:Pochonia chlamydosporia infects eggs and females of economically important plant-parasitic nematodes. The fungal isolates parasitizing different nematodes are genetically distinct. To understand their intraspecific genetic differentiation, parasitic mechanisms, and adaptive evolution, we assembled seven putative chromosomes of P. chlamydosporia strain 170 isolated from root-knot nematode eggs (~44 Mb, including 7.19% of transposable elements) and compared them with the genome of the strain 123 (~41 Mb) isolated from cereal cyst nematode. We focus on secretomes of the fungus, which play important roles in pathogenicity and fungus-host/environment interactions, and identified 1,750 secreted proteins, with a high proportion of carboxypeptidases, subtilisins, and chitinases. We analyzed the phylogenies of these genes and predicted new pathogenic molecules. By comparative transcriptome analysis, we found that secreted proteins involved in responses to nutrient stress are mainly comprised of proteases and glycoside hydrolases. Moreover, 32 secreted proteins undergoing positive selection and 71 duplicated gene pairs encoding secreted proteins are identified. Two duplicated pairs encoding secreted glycosyl hydrolases (GH30), which may be related to fungal endophytic process and lost in many insect-pathogenic fungi but exist in nematophagous fungi, are putatively acquired from bacteria by horizontal gene transfer. The results help understanding genetic origins and evolution of parasitism-related genes.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Lin R,Qin F,Shen B,Shi Q,Liu C,Zhang X,Jiao Y,Lu J,Gao Y,Suarez-Fernandez M,Lopez-Moya F,Lopez-Llorca LV,Wang G,Mao Z,Ling J,Yang Y,Cheng X,Xie B

doi

10.1038/s41598-018-19169-5

subject

Has Abstract

pub_date

2018-01-18 00:00:00

pages

1123

issue

1

issn

2045-2322

pii

10.1038/s41598-018-19169-5

journal_volume

8

pub_type

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