A5079198225- Protist diversity and phylogeny
- Microbial Community Ecology and Physiology
- Genomics and Phylogenetic Studies
- Legionella and Acanthamoeba research
- Amoebic Infections and Treatments
- Parasitic Infections and Diagnostics
- Neutrophil, Myeloperoxidase and Oxidative Mechanisms
- Photosynthetic Processes and Mechanisms
- Plant Disease Resistance and Genetics
- Cancer Research and Treatments
- Mitochondrial Function and Pathology
- Chromosomal and Genetic Variations
- Photoreceptor and optogenetics research
- Marine Ecology and Invasive Species
- Plant Pathogens and Fungal Diseases
- Mycorrhizal Fungi and Plant Interactions
- Plant and Fungal Interactions Research
- Legume Nitrogen Fixing Symbiosis
- Marine and coastal ecosystems
- Myxozoan Parasites in Aquatic Species
- RNA and protein synthesis mechanisms
- Vibrio bacteria research studies
- Genetic diversity and population structure
- Insect and Arachnid Ecology and Behavior
- Plant Pathogens and Resistance
Dalhousie University
2016-2025
Indian Institute of Science Education and Research, Bhopal
2024
Nova Scotia Health Authority
2018
Canadian Institute for Advanced Research
2007-2017
University of British Columbia
2004-2012
University of Buenos Aires
2007
Fundación Ciencias Exactas y Naturales
2001
Idaho State University
2001
Current sampling of genomic sequence data from eukaryotes is relatively poor, biased, and inadequate to address important questions about their biology, evolution, ecology; this Community Page describes a resource 700 transcriptomes marine microbial help understand role in the world's oceans.
Cryptophyte and chlorarachniophyte algae are transitional forms in the widespread secondary endosymbiotic acquisition of photosynthesis by engulfment eukaryotic algae. Unlike most plastid-bearing algae, miniaturized versions endosymbiont nuclei (nucleomorphs) persist cryptophytes chlorarachniophytes. To determine why, to address other fundamental questions about eukaryote-eukaryote endosymbiosis, we sequenced nuclear genomes cryptophyte Guillardia theta Bigelowiella natans. Both have >21,000...
Abstract Diverse microbial ecosystems underpin life in the sea. Among these microbes are many unicellular eukaryotes that span diversity of eukaryotic tree life. However, genetic tractability has been limited to a few species, which do not represent or environmentally relevant taxa. Here, we report on development tools range protists primarily from marine environments. We present evidence for foreign DNA delivery and expression 13 species never before transformed advancement eight other as...
The introduction of plastids into different heterotrophic protists created lineages algae that diversified explosively, proliferated in marine and freshwater environments, radically altered the biosphere. origins these secondary are usually inferred from presence additional plastid membranes. However, two examples provide unique snapshots secondary-endosymbiosis-in-action, because they retain a vestige endosymbiont nucleus known as nucleomorph. These chlorarachniophytes cryptomonads, which...
Arbuscular mycorrhizal fungi (AMF) represent an ecologically important and evolutionarily intriguing group of symbionts land plants, currently thought to have propagated clonally for over 500 Myr. AMF produce multinucleate spores may exchange nuclei through anastomosis, but meiosis has never been observed in this group. A provocative alternative their successful long asexual evolutionary history is that these organisms cryptic sex, allowing them recombine alleles compensate deleterious...
The Alphaproteobacteria is an extraordinarily diverse and ancient group of bacteria. Previous attempts to infer its deep phylogeny have been plagued with methodological artefacts. To overcome this, we analyzed a dataset 200 single-copy conserved genes employed strategies reduce compositional Such include using novel dataset-specific profile mixture models recoding schemes, removing sites, taxa that are compositionally biased. We show the Rickettsiales Holosporales (both groups intracellular...
The origin of land plants from algae is a long-standing question in evolutionary biology. It becoming increasingly clear that many characters were once assumed to be 'embryophyte specific' can fact found their closest algal relatives, the streptophyte algae. One such case phenylpropanoid pathway. While biochemical data indicate harbor lignin-like components, core pathway, which serves as backbone lignin biosynthesis, has been proposed have arisen at base plants. Here we revisit this...
We investigated the relationship between satellite copy number and chromosomal evolution in tuco-tucos (genus Ctenomys), a karyotypically diverse clade of rodents. To explore phylogenetic relationships among 23 species 5 undescribed forms, we sequenced complete mitochondrial cytochrome b genes 27 specimens incorporated previously published sequences. then used quantitative dot-blot techniques to assess changes major Ctenomys DNA (satDNA), named RPCS. Our analysis variation RPCS employed...
The gene density of eukaryotic nuclear genomes is generally low relative to prokaryotes, but several lineages (many parasites or endosymbionts) have independently evolved highly compacted, gene-dense genomes. best studied these are the microsporidia, adapted fungal parasites, and nucleomorphs, relict nuclei endosymbiotic algae found in cryptomonads chlorarachniophytes. These systems now models for effects compaction on form dynamics genome. Here we report a large-scale investigation...
The number of cases lateral or horizontal gene transfer in eukaryotic genomes is growing steadily, but most cases, neither the donor nor recipient known, and biological implications are not clear. We describe a relatively well-defined case from cyanobacterial source to an ancestor dinoflagellates that diverged before Oxyrrhis after Perkinsus. This also exceptional 2 adjacent genes, paralogue shikimate biosynthetic enzyme AroB O-methyltransferase (OMT) were transferred together formed fusion...
Reconstructing the history of plastid acquisition and loss in alveolate protists is a difficult problem because our knowledge distribution plastids extant lineages incomplete due to possible presence cryptic, nonphotosynthetic several lineages. The discovery apicoplast apicomplexan parasites has drawn attention this and, more specifically, question whether many other also contain cryptic or are derived from plastid-containing ancestors. Oxyrrhis marina one such organism: It heterotrophic,...
Abstract Protein phosphatases with Kelch-like domains (PPKL) are members of the phosphoprotein family present only in plants and alveolates. PPKL have been described as positive effectors brassinosteroid (BR) signaling plants. Most evidence supporting this role has gathered using one four homologs Arabidopsis (Arabidopsis thaliana), BRASSINOSTEROID-INSENSITIVE1 SUPPRESSOR (BSU1). We reappraised roles other three family, BSL1, BSL2, BSL3, through phylogenetic, functional, genetic analyses....
<title>Abstract</title> Mirusviruses are enigmatic double-stranded (ds) DNA viruses with a chimeric evolutionary history – they have informational genes of Nucleocytoviricota ancestry and virion module most like those herpesviruses. Mirusvirus genomes were discovered in marine metagenomic data (1) but, despite their abundance broad environmental distribution, host range is unknown. The thraustochytrid protist Aurantiochytrium limacinum was recently found to possess two mirusvirus-like...