A5056092219- Protist diversity and phylogeny
- Microbial Community Ecology and Physiology
- Synthesis and Reactions of Organic Compounds
- Synthesis and Characterization of Heterocyclic Compounds
- Genomics and Phylogenetic Studies
- Synthesis and Reactivity of Sulfur-Containing Compounds
- Structural and Chemical Analysis of Organic and Inorganic Compounds
- Synthesis and Biological Evaluation
- Synthesis and Catalytic Reactions
- Organic Chemistry Cycloaddition Reactions
- Chemical synthesis and pharmacological studies
- Synthesis of heterocyclic compounds
- Chemical Reactions and Mechanisms
- Phenothiazines and Benzothiazines Synthesis and Activities
- Organic and Inorganic Chemical Reactions
- Synthesis and biological activity
- Chemical Reaction Mechanisms
- Fluorine in Organic Chemistry
- Chromosomal and Genetic Variations
- Chemical Synthesis and Analysis
- Methane Hydrates and Related Phenomena
- Synthesis and Reactivity of Heterocycles
- Environmental DNA in Biodiversity Studies
- Synthesis of Organic Compounds
- Chemical Synthesis and Reactions
St Petersburg University
2013-2024
Universität Innsbruck
2022-2024
Zoological Institute
2020-2023
Kazan Federal University
2023
Novosibirsk State University
2021
All-Russian Scientific Research Institute of Technical Physics
2014
S. M. Kirov Military Medical Academy
2001
Pushkin Leningrad State University
1971-1993
Abstract Whole-genome duplications (WGDs) have shaped the gene repertoire of many eukaryotic lineages. The redundancy created by WGDs typically results in a phase massive loss. However, some WGD–derived paralogs are maintained over long evolutionary periods, and relative contributions different selective pressures to their maintenance still debated. Previous studies revealed history three successive lineage ciliate Paramecium tetraurelia two its sister species from aurelia complex. Here, we...
The order Rickettsiales (Alphaproteobacteria) encompasses multiple diverse lineages of host-associated bacteria, including pathogens, reproductive manipulators, and mutualists. Here, in to understand how intracellularity host association originated this order, whether they are ancestral or convergently evolved characteristics, we built a large phylogenetically-balanced dataset that includes de novo sequenced genomes selection published genomic metagenomic assemblies. We perform detailed...
Current understanding of the population genetics free-living unicellular eukaryotes is limited, and amount genetic variability in these organisms still a matter debate. We characterized-reproductively genetically-worldwide samples multiple Paramecium species belonging to cryptic complex, aurelia, whose have been shown be reproductively isolated. found that levels diversity both nucleus mitochondrion are substantial within groups compatible P. aurelia strains but drop considerably when...
Abstract Members of the order Rickettsiales are often found in association with ciliated protists. An interesting case is bacterial endosymbiont “ Candidatus Megaira”, which phylogenetically closely related to pathogen Rickettsia . Megaira” was first described as an intracellular bacterium several ciliate species. Since then it has been diverse evolutionary distantly-related hosts, among them other unicellular eukaryotes, and also algae, metazoa, such cnidarians. We provide characterization...
Ciliated protists often form symbioses with many diverse microorganisms. In particular, symbiotic associations between ciliates and green algae, as well intracellular bacteria, are rather wide-spread in nature. this study, we describe the complex system a very rare ciliate, Paramecium chlorelligerum, unicellular algae inhabiting its cytoplasm, novel bacteria colonizing host macronucleus. previously found only twice Germany, was retrieved from location vicinity of St. Petersburg Russia....
Members of the bacterial order Rickettsiales are obligatorily associated with a wide range eukaryotic hosts. Their evolutionary trajectories, in particular concerning origin shared or differential traits among distant sub-lineages, still poorly understood. Here, we characterized novel bacterium ciliate Paramecium tredecaurelia and phylogenetically related to Rickettsia genus. Its genome encodes significant lineage-specific features, chiefly mevalonate pathway gene repertoire, involved...
Hot springs are known as highly adverse extreme environments where thermophilic and hyperthermophilic microorganisms can survive. We describe taxonomic diversity of several microbial biofilms collected along water temperature gradient in hot streams the aquatic system Stolbovskie on Kunashir Island, Kurils, Russia. The composition studied communities was assessed by 16S rRNA gene metabarcoding for bacteria archaea, 18S protists. Richness geothermal decreased with increase temperature, while...
Holospora and related bacteria are a group of obligate Paramecium symbionts. Characteristic features their infectivity, the presence two distinct morphotypes, usually strict specialization for single species as host nuclear compartment (either somatic or generative nucleus) reproduction. caryophila steps out line, naturally occurring in biaurelia caudatum. This study addresses phylogenetic relationship among H. other based on 16S rRNA gene sequence comparison analyzing type strain seven new...
Microbiomes of multicellular organisms are one the hottest topics in microbiology and physiology, while only few studies addressed bacterial communities associated with protists. Protists widespread all environments can be colonized by plethora different bacteria, including also human pathogens. The aim this study was to characterize prokaryotic community sessile ciliate Stentor coeruleus. 16S rRNA gene metabarcoding performed on single cells S. coeruleus their environment, water from sewage...
Paramecium (Ciliophora) is an ideal model organism to study the biogeography of protists. However, many regions world, such as Central America, are still neglected in understanding diversity. We combined morphological and molecular approaches identify paramecia isolated from more than 130 samples collected different waterbodies several states Mexico. found representatives six morphospecies, including rare species jenningsi, putrinum, which first report this tropical regions. also retrieved...
Abstract The Paramecium aurelia complex, a group of morphologically similar but sexually incompatible sibling species, is unique example the evolutionary plasticity mating-type systems. Each species has two mating types, O (Odd) and E (Even). Although types are homologous in all three different modes determination inheritance have been described: genetic by Mendelian alleles, stochastic developmental determination, maternally inherited determination. Previous work latter kind revealed key...
Paramecium (Ciliophora) systematics is well studied, and about twenty morphological species have been described. The may include several genetic species. However, molecular phylogenetic analyses revealed that the diversity within could be even higher has raised a problem of cryptic whose statuses remain uncertain. In present study, we provide characterization two novel While lynni n. sp., although morphologically similar to P. multimicronucleatum, phylogenetically separated from all other...
Summary Holosporales are an alphaproteobacterial lineage encompassing bacteria obligatorily associated with multiple diverse eukaryotes. For most representatives, little is known on the interactions their hosts. In this study, we characterized a novel symbiont of ciliate Paramecium polycaryum . This bacterium inhabits host cytoplasm, frequently forming quite large aggregates. Possibly due to such aggregates, cells sometimes displayed lethal division defects. The was also able experimentally...
Abstract A new microsporidian species, Globosporidium paramecii gen. nov., sp. from Paramecium primaurelia is described on the basis of morphology, fine structure, and SSU rRNA gene sequence. This first case microsporidiosis in reported so far. All observed stages life cycle are monokaryotic. The parasites develop cytoplasm, at least some part population endoplasmic reticulum its derivates. Meronts divide by binary fission. Sporogonial plasmodium divides rosette-like budding. Early...
New stands of Paramecium dodecaurelia were found in Russia, Ukraine, Kazahstan, Poland, and Tenerife. Molecular studies (RAPD sequencing LSU rRNA CO1 mtDNA gene fragments) P. strains depicted intraspecific polymorphism within the species, revealed as distinct differences between from USA comparison with different regions Palearctic.