Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Chemical warfare does not always win – rapid evolution of increased virulence in Beauveria bassiana

ABSTRACT: Virulence is a key trait under selection during host-parasite coevolution. In order to obtain increased fitness, parasites are predicted to increase their ability to circumvent and overcome host immunity. A particular challenge for pathogens are external immune systems, found among various invertebrates. Such external immune systems are chemical defence systems comprised of highly potent antimicrobial compounds released by prospective hosts into the environment. We carried out a coevolution experiment with the entomopathogenic fungus, Beauveria bassiana, and the red flour beetle, Tribolium castaneum, which has a well-documented external immune system. Surprisingly, after just seven transfers of experimental evolution we saw a significant increase in virulence in all B. bassiana. This increase in virulence was mainly the result of the B. bassiana isolates evolving resistance to the external immune defences of the T. castaneum beetles, but not obviously through the increased production of toxins or other harmful substances. Furthermore, transcriptomic analyses of B. bassiana RNA-seq data implicates up-regulation of genes responsible for resistance to oxidative stress underlying the observed resistance. We conclude that external immunity acts as a powerful selective force for virulence evolution, with an increase in virulence being achieved apparently entirely by overcoming these defences, most likely due to elevated oxidative stress resistance.

ORGANISM(S): Beauveria bassiana

PROVIDER: GSE71570 | GEO | 2017/03/09

SECONDARY ACCESSION(S): PRJNA291528

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Rad6,an E2 enzymes required for insect-pathogenic lifestyle, UV damage repair, and genomic expression of Beauveria bassiana

Project description:This transcriptomic analysis aims at unveiling all possible genes orchestrated by Rad6, which is evidently required for insect pathogenicity , virulence-related cellular events and UV damage repair of Beauveria bassiana

2023-10-17 | GSE245232 | GEO

Innate immune checkpoint inhibitor resistance is associated with melanoma sub-types exhibiting invasive and de-differentiated gene expression signatures

Project description:Melanoma is a highly aggressive skin cancer, which, although highly immunogenic, frequently escapes the body’s immune defences. Immune checkpoint inhibitors (ICI), such as anti-PD1, anti-PDL1, and anti-CTLA4 antibodies lead to reactivation of immune pathways, promoting rejection of melanoma. However, the benefits of ICI therapy remain limited to a relatively small proportion of patients who do not exhibit ICI resistance. Moreover, the precise mechanisms underlying innate and acquired ICI resistance remain unclear. Here, we have investigated differences in melanoma tissues in responder and non-responder patients to anti-PD1 therapy in terms of tumour and immune cell gene-associated signatures.

2022-09-15 | GSE213145 | GEO

Quantitative analysis of acetylome reveals the roles of Rpd3 and Sir2 in asexual development, virulence and multiple stress responses in Beauveria bassiana.

Project description:Lysine acetylation is one of the most prevalent post-translational modifications and has since been found to regulate histone functions and affect chromatin structure and gene expression. Here, we charactered Rpd3, a histone deacetylase of Beauveria bassiana, played important roles in the deacetylation of histone H3 and H4. We unveil the role of Rpd3 in asexual development and show that a ΔRpd3 mutant strain has severe growth defects and is defective in conidiophores and blastospores development. Acetylomic analyses indicated that Rpd3 functions in asexual development and virulence and multiple stress responses via broad genetic pathways in B. bassiana. Therefore, we conclude that BbRpd3 is vital for asexual development, virulence and multiple stress responses in Beauveria bassiana.

2021-08-12 | PXD006714 | Pride

Quantitative analysis of proteome reveals the roles of Rpd3 and Sir2 in asexual development, virulence and multiple stress responses in Beauveria bassiana.

Project description:Lysine acetylation is one of the most prevalent post-translational modifications and has since been found to regulate histone functions and affect chromatin structure and gene expression. Here, we charactered Rpd3, a histone deacetylase of Beauveria bassiana, played important roles in the deacetylation of histone H3 and H4. We unveil the role of Rpd3 in asexual development and show that a ΔRpd3 mutant strain has severe growth defects and is defective in conidiophores and blastospores development. Proteomic analyses indicated that Rpd3 functions in asexual development and virulence and multiple stress responses via broad genetic pathways in B. bassiana. Therefore, we conclude that BbRpd3 is vital for asexual development, virulence and multiple stress responses in Beauveria bassiana.

2021-08-12 | PXD006713 | Pride

Immune Stimulation via Wounding Alters Chemical Profiles of Adult Tribolium castaneum

Project description:Group-living individuals experience immense risk of disease transmission and parasite infection. In social and in some non-social insects, disease control with immunomodulation arises not only via individual immune defenses, but also via infochemicals such as contact cues and (defensive) volatiles to mount a group-level immunity. However, little is known about whether activation of the immune system elicits changes in chemical phenotypes, which may mediate these responses. We here asked whether individual immune experience resulting from wounding or injection of heat-killed Bacillus thuringiensis (priming) leads to changes in the chemical profiles of female and male adult red flour beetles, Tribolium castaneum, which are non-social but gregarious. We analyzed insect extracts using GC-FID to study the chemical composition of (1) cuticular hydrocarbons (CHCs) as candidates for the transfer of immunity-related information between individuals via contact, and (2) stink gland secretions, with analysis of benzoquinones as main active compounds regulating ‘external immunity’. Despite a pronounced sexual dimorphism in CHC profiles, wounding stimulation led to similar profile changes in males and females with increases in the proportion of methyl-branched alkanes compared to naïve beetles. While changes in the overall secretion profiles were less pronounced, absolute amounts of benzoquinones were transiently elevated in wounded compared to naïve females. Responses to priming were insignificant in CHCs and secretions. We suggest that changes in different infochemicals after wounding may mediate immune status signaling in the context of both internal and external immune responses in groups of this non-social insect, thus showing parallels to social immunity.

2023-04-24 | MTBLS2277 | MetaboLights

Profound effect of a small cysteine-free protein (pspA) on genomic expression of Beauveria bassiana

Project description:Purpose: This transcriptomic analysis aims at unveiling all possible genes orchestrated by pspA, which is evidently required for insect pathogenicity and virulence-related cellular events of Beauveria bassiana. Methods: Total RNAs were extracted from three 3-day-old hyphal cultures (replicates) of pspA disruption and wild-type strains grown under normal culture conditionsand and subjected to deep sequencing on Illumina NovaseqTM 6000 platform. The sequence reads that passed quality filters were mapped to the genome of Beauveria bassiana. All genes differentially expressed in the disruptant versus the wild-type strain were enriched to GO function classes and KEGG pathways. Results: The resultant transcriptome comprises 10430 genes annotated or not annotated. Among those, 1818 genes (genomic 17.54%) were dysregulated in the absence of pspA, including 806 down-regulated and 1012 up-regulated. Conclusions: pspA lacking any predictable function domain has profound impact on the genomic expression of Beauveria bassiana.

2020-10-01 | GSE158758 | GEO

Genome-wide effect of carbon catabolic repressor 1 (Cre1) on genomic expression of Beauveria bassiana

Project description:Purpose: This transcriptomic analysis aims at unveiling all possible genes orchestrated by Cre1, which is evidently required for insect pathogenicity and virulence-related cellular events of Beauveria bassiana. Methods: Total RNAs were extracted from three 3-day-old hyphal cultures (replicates) of cre1 deletion and wild-type strains grown under normal culture conditionsand and subjected to deep sequencing on Illumina NovaseqTM 6000 platform. The sequence reads that passed quality filters were mapped to the genome of Beauveria bassiana. All genes differentially expressed in the deletion mutant versus the wild-type strain were enriched to GO function classes and KEGG pathways. Results: The resultant transcriptome comprises 10364 genes annotated or not annotated. Among those, 1881 genes (genomic 18.149%) were dysregulated in the absence of cre1, including 1117 down-regulated and 764 up-regulated. Conclusions: Cre1 has profound impact on the genomic expression of Beauveria bassiana.

2021-10-02 | GSE184973 | GEO

Effect of maternal treatment on gene expression differences in Bacillus thuringiensis infected pooled larvae

Project description:This study examines gene expression differences between infected larvae from different maternal infection backgrounds to try to understand the immunological basis of invertebrate immune priming. Female Tribolium castaneum beetles were either jabbed with sterile saline, heat killed Bt, or left naÃ¯ve. 15 Offspring from the first and second broods were infected with Bt and 24 hours later pooled by treatment and flash frozen Beetles from saline and primed maternal backgrounds are compared to naÃ¯ve infected Pooled whole larvae, custom array for T. castaneum, 1 replicate per treatment comparison. Same naÃ¯ve sample used for both arrays

2016-06-01 | E-GEOD-44912 | biostudies-arrayexpress

Rgg-Shp regulators are important for pneumococcal colonization and invasion through their effect on mannose utilization and capsule synthesis

Project description:Microbes communicate with each other by using quorum sensing (QS) systems and modulate their collective ‘behavior’ for in-host colonization and virulence, biofilm formation, and environmental adaptation. The recent increase in genome data availability reveals the presence of several putative QS sensing circuits in microbial pathogens, but many of these have not been functionally characterized yet, despite their possible utility as drug targets. To increase the repertoire of functionally characterized QS systems in bacteria, we studied Rgg144/Shp144 and Rgg939/Shp939, two putative QS systems in the important human pathogen Streptococcus pneumoniae. We find that both of these QS circuits are induced by short hydrophobic peptides (Shp) upon sensing sugars found in the respiratory tract, such as galactose and mannose. Microarray analyses using cultures grown on mannose and galactose revealed that the expression of a large number of genes is controlled by these QS systems, especially those encoding for essential physiological functions and virulence-related genes such as the capsular locus. Moreover, the array data revealed evidence for cross-talk between these systems. Finally, these Rgg systems play a key role in colonization and virulence, as deletion mutants of these QS systems are attenuated in the mouse models of colonization and pneumonia.

2018-10-19 | GSE112288 | GEO

Transcriptome comparison of the Streptococcus pneumoniae D39 ∆rgg939 to D39 wild type grown in Mannose

2018-10-19 | GSE112286 | GEO