Rickettsiella isopodorum
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ABSTRACT:
PROVIDER: PRJNA644295 | ENA |
REPOSITORIES: ENA
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Project description:Here we describe the principles of 3D genome folding dynamics in vertebrates and show how lineage-specific patterns of genome reshuffling can result in different chromatin configurations. We (i) identified different patterns of chromosome folding across vertebrate species, (ii) reconstructed ancestral marsupial and afrotherian genomes analyzing whole-genome sequences of 10 species representative of the major therian phylogroups, (iii) detected lineage-specific chromosome rearrangements and (iv) identified the dynamics of the structural properties of genome reshuffling through therian evolution.
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Project description:Variations between strains have been extensively studied in human pathogens mainly because even genomically highly identical strains can cause severely different phenotypes in their hosts. Here we investigate within-species diversity in Rhabdochlamydia porcellionis a pathogen infecting terrestrial isopods and a member of the phylum Chlamydia that also includes well-known human pathogens as Chlamydia trachomatis. Using an infection assay in Sf9 insect cell cultures we could show that albeit there are only few genomic variations, the strains 15C and ZGO cause different phenotypes. To investigate potential underlying mechanisms we carried out a global gene expression analysis and could show that changes in major metabolic pathways help strain 15C to replicate more efficiently in the host cells. In addition we found that genes shown to be involved in pathogenicity and host interaction of human pathogenic chlamydia i.e. genes encoding the type III secretion system and polymorphic membrane proteins are regulated differently by the strains.
2023-09-01 | GSE212062 | GEO
Project description:Background The number of managed honey bee colonies has considerably decreased in many developed countries in recent years and the ectoparasitic mites are considered as major threats to honey bee colonies and health. However, their general biology remains poorly understood. Results We sequenced the genome and transcriptomes of Tropilaelaps mercedesae, the prevalent ectoparasitic mite infesting honey bees in Asia. The de novo assembled genome sequence (353 Mb) represents 53% of the estimated genome size because of the compression of repetitive sequences; nevertheless, we predicted 15,190 protein-coding genes which were well supported by the mite transcriptomes and proteomic dataes. Although amino acid substitutions have been accelerated within the conserved core genes in of two mites, T. mercedesae and Metaseiulus occidentalis, T. mercedesae has undergone the least gene family expansion and contraction between the seven arthropods we tested. The number of sensory system genes has been dramatically reduced; meanwhile, T. mercedesae may have evolved a specialized cuticle and water homeostasis mechanisms, as well as epigenetic control of gene expression for ploidy compensation between males and females., and water homeostasis. T. mercedesae contains all gene sets required to detoxify xenobiotics, enabling it to be miticide resistant. T. mercedesae is closely associated with a symbiotic bacteriuma (Rickettsiella grylli-like) and DWVdeformed wing virus (DWV), the most prevalent honey bee virus. The presence of DWV in both adult male and female mites was also confirmed by the proteomic analysis. Conclusions T. mercedesae has a very specialized life history and habitat as the ectoparasitic mite strictly dependsing on the honey bee inside the a stable colony. Thus, comparison of the genome and transcriptome sequences with those of a tick and free-living mites and tick has revealed the specific features of the genome shaped by interaction with the honey bee and colony environment. T. mercedesae, as well as Varroa destructor, genome and transcriptome sequences not only provide insights into the mite biology, but may also help to develop measures to control the most serious pests of the honey bee.
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