A5033719209- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Bacteriophages and microbial interactions
- Protist diversity and phylogeny
- Coral and Marine Ecosystems Studies
- Genomics and Phylogenetic Studies
- Methane Hydrates and Related Phenomena
- Marine Toxins and Detection Methods
- Diatoms and Algae Research
- Plant Virus Research Studies
- Marine Biology and Ecology Research
- Algal biology and biofuel production
- Atmospheric chemistry and aerosols
- Aquaculture disease management and microbiota
- Photosynthetic Processes and Mechanisms
- Vibrio bacteria research studies
- Atmospheric aerosols and clouds
- Ocean Acidification Effects and Responses
- Marine Bivalve and Aquaculture Studies
- Animal Virus Infections Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Geology and Paleoclimatology Research
- Metabolomics and Mass Spectrometry Studies
- Evolution and Genetic Dynamics
- Soybean genetics and cultivation
Weizmann Institute of Science
2016-2025
Planta
2016-2023
Rutgers, The State University of New Jersey
2007-2012
École Normale Supérieure - PSL
2006-2010
Centre National de la Recherche Scientifique
2006-2010
Inserm
2010
Hebrew University of Jerusalem
1999-2007
Rütgers (Germany)
2007
Rutgers Sexual and Reproductive Health and Rights
2007
Stazione Zoologica Anton Dohrn
2004-2006
Diatoms are unicellular algae with plastids acquired by secondary endosymbiosis. They responsible for ∼20% of global carbon fixation. We report the 34 million–base pair draft nuclear genome marine diatom Thalassiosira pseudonana and its 129 thousand–base plastid 44 mitochondrial genomes. Sequence optical restriction mapping revealed 24 diploid chromosomes. identified novel genes silicic acid transport formation silica-based cell walls, high-affinity iron uptake, biosynthetic enzymes several...
Diatoms, a type of microscopic marine and freshwater alga, dominate the oceans are responsible for about fifth primary productivity on Earth. The complete genome sequence Phaeodactylum tricornutum is reported in this issue, second diatom to be sequenced. Comparisons with Thalassiosira pseudonana, first, reveal that hundreds genes have been acquired by gene transfer from bacteria — or vice versa. Gene appears common during evolution, creating unorthodox combinations including some plants...
Marine viruses that infect phytoplankton are recognized as a major ecological and evolutionary driving force, shaping community structure nutrient cycling in the marine environment. Little is known about signal transduction pathways mediating viral infection. We show glycosphingolipids regulate infection of Emiliania huxleyi, cosmopolitan coccolithophore plays role global carbon cycle. These sphingolipids derive from an unprecedented cluster biosynthetic genes Coccolithovirus genomes,...
Sourcing the smell of seaside Marine phytoplankton plays a critical role in global sulfur cycle. Algae, for instance, are main source aromatic compound dimethylsulfide (DMS) released from oceans into atmosphere. Alcolombri et al. identified lyase enzyme responsible DMS production bloom-forming marine Emiliania huxleyi (see Perspective by Johnston). The presence this gene other globally distributed and corals suggests that it may serve as reliable indicator across diverse phyla. Because gets...
Abstract Anthropogenic pollution from marine microplastic particles is a growing concern, both as source of toxic compounds, and because they can transport pathogens other pollutants. Airborne were previously observed over terrestrial coastal locations, but not in the remote ocean. Here, we collected ambient aerosol samples North Atlantic Ocean, including atmosphere, during Tara Pacific expedition May-June 2016, chemically characterized them using micro-Raman spectroscopy. We detected range...
Significance The fitness of corals and their ability to form large reefs hinge on capacity exchange oxygen nutrients with environment. Lacking gills or other ventilating organs, have been commonly assumed depend entirely ambient flow overcome the mass transport limitations associated molecular diffusion. Here, we show that are not enslaved but instead, can actively enhance by producing intense vortical flows epidermal cilia. By vigorously stirring water immediately adjacent surface, this...
Unicellular algae, termed phytoplankton, greatly impact the marine environment by serving as basis of food webs and playing central roles in biogeochemical cycling elements. The interactions between phytoplankton heterotrophic bacteria affect fitness both partners. It is becoming increasingly recognized that metabolic exchange determines nature such interactions, but underlying molecular mechanisms remain underexplored. Here, we investigated for bacterial lifestyle switch, from coexistence...
Diatoms are an important group of eukaryotic phytoplankton, responsible for about 20% global primary productivity. Study the functional role chemical signaling within phytoplankton assemblages is still in its infancy although recent reports diatoms suggest existence chemical-based defense strategies. Here, we demonstrate how accurate perception diatom-derived reactive aldehydes can determine cell fate diatoms. In particular, aldehyde (2E,4E/Z)-decadienal (DD) trigger intracellular calcium...
Summary Microcystins constitute a serious threat to the quality of drinking water worldwide. These protein phosphatase inhibitors are formed by various cyanobacterial species, including Microcystis sp. produced complex microcystin synthetase, composed peptide synthetases and polyketide synthases, encoded mcyA‐J gene cluster. Recent phylogenetic analysis suggested that synthetase predated metazoan lineage, thus dismissing possibility microcystins emerged as means defence against grazing,...
Marine viruses are major evolutionary and biogeochemical drivers in marine microbial foodwebs. However, an in-depth understanding of the cellular mechanisms signal transduction pathways mediating host–virus interactions during natural bloom dynamics has remained elusive. We used field-based mesocosms to examine “arms race” between populations coccolithophore Emiliania huxleyi its double-stranded DNA-containing coccolithoviruses (EhVs). Specifically, we examined EhV infection regulation cell...
Significance Phytoplankton form massive blooms in the oceans that are controlled by nutrients, light availability, and biotic interactions with grazers viruses. Although phytoplankton were traditionally considered passive drifters currents here we demonstrate how diatom cells sense respond to oxidative stress through a redox-sensitive protein network. We further redox sensitivity of nitrogen assimilation, which is essential for ocean, provide compelling evidence organelle-specific oxidation...
Abstract Marine viruses are major ecological and evolutionary drivers of microbial food webs regulating the fate carbon in ocean. We combined transcriptomic metabolomic analyses to explore cellular pathways mediating interaction between bloom-forming coccolithophore Emiliania huxleyi its specific coccolithoviruses (E. virus [EhV]). show that EhV induces profound transcriptome remodeling targeted toward fatty acid synthesis support viral assembly. A metabolic shift production viral-derived...
Summary Viruses that infect marine photosynthetic microorganisms are major ecological and evolutionary drivers of microbial food webs, estimated to turn over more than a quarter the total photosynthetically fixed carbon. Viral infection bloom‐forming microalga Emiliania huxleyi induces rapid remodeling host primary metabolism, targeted towards fatty acid metabolism. We applied liquid chromatography‐mass spectrometry ( LC ‐ MS )‐based lipidomics approach combined with imaging flow cytometry...
Abstract Coral reefs, and the unique ecosystems they support, are facing severe threats by human activities climate change. Our understanding of these is hampered lack robust approaches for studying micro-scale interactions between corals their environment. Here we present an experimental platform, coral-on-a-chip, combining micropropagation microfluidics to allow direct microscopic study live coral polyps. The small transparent micropropagates ideally suited live-imaging microscopy, while...
Significance Marine viruses constitute a major ecological and evolutionary driving force in marine ecosystems are responsible for cycling of nutrients; however, their dispersal mechanisms remain underexplored. By using one the most established host–pathogen planktonic model systems we provide strong evidence that specific coccolithophores can be transmitted stay infective as aerosols. Being transported by wind, phytoplankton conveyed long distances transmit infection to remote locations...
Emiliania huxleyi is a bloom-forming microalga that affects the global sulfur cycle by producing large amounts of dimethylsulfoniopropionate (DMSP) and its volatile metabolic product dimethyl sulfide. Top-down regulation E. blooms has been attributed to viruses grazers; however, possible involvement algicidal bacteria in bloom demise remained elusive. We demonstrate Roseobacter strain, Sulfitobacter D7, we isolated from North Atlantic bloom, exhibited effects against upon coculturing. Both...