Articles tagged with Eukaryotes
Researchers constructed yeast strain SYNE27α with all 300 spliceosomal introns removed, demonstrating intron non-essentiality. The strain showed slow growth but heterozygous cells grew normally, supporting recessive fitness defects.
A study by IRB Barcelona and BSC suggests that the origin of complex cells was a longer, more gradual process than previously thought. The researchers identified signals from bacterial groups and giant viruses that may have facilitated gene exchange, contributing to the complexity of eukaryotic cells.
The discovery reveals that early complex life required oxygen and lived on or within the seafloor, contrary to previous expectations. The study's findings suggest that ancient eukaryotes were restricted to oxygenated environments, including offshore waters and coastal regions.
Researchers found that ancient eukaryotes required oxygen to survive, living primarily on the seafloor. The team's study overturns long-held assumptions and provides new insights into the evolution of these lifeforms.
Researchers discover that using filters with larger pore sizes significantly improves the recovery of eukaryotic DNA in seawater samples, allowing for more accurate detection of marine life. This breakthrough could enhance the application of environmental DNA analysis in biomonitoring and conservation efforts.
A comprehensive phylogenomic tree of ciliates has been reconstructed, providing a new framework for the phylum Ciliophora. The study establishes three main lineages and a divergence timeline linking key splits to major Earth history events. This robust phylogenetic framework enables precise tracing of key evolutionary innovations.
Scientists from the University of Texas at Austin have solved the mystery of how complex life evolved. The discovery suggests that eukaryotes arose when an Asgard archaeon developed a symbiotic relationship with an alphaproteobacterium, which led to the evolution of mitochondria and oxygen-based energy metabolism.
A groundbreaking new study sheds light on the conditions needed for early organisms to evolve and challenges long-standing scientific theories. The research indicates that complex organisms evolved around 2.9 billion years ago, significantly earlier than previously believed.
A study reveals how plate tectonics reshaped the planet, triggering conditions for oxygen-rich oceans and eukaryote evolution. The findings link deep-Earth dynamics to near-surface geochemical and biological evolution, offering a unifying framework.
The Earth BioGenome Project aims to create a digital library of DNA sequences to preserve and protect life on Earth. The project has revealed a refined strategy to scale up the sequencing of 150,000 species, accelerating biodiversity research and global conservation.
Researchers found that eukaryotes could survive in shallow pools of water atop ice sheets, similar to modern-day meltwater ponds in Antarctica. These environments supported diverse communities of early complex life, influenced by salinity levels.
Researchers at ISTA have discovered a new DNA marker, N4-methylcytosine (4mC), crucial for sperm function and fertility in the liverwort Marchantia polymorpha. The team found that high levels of 4mC are necessary for agile sperm development, affecting swimming speed, direction, and fertilization success.
Researchers have found a previously unknown group of microbes, known as Asgard archaea, which possess structures similar to those found in eukaryotic cells. These discoveries suggest that Asgard archaea may be the missing link between archaea and eukaryotes, challenging our current understanding of the three domains of life.
Research reveals that warmer conditions in Antarctic waters lead to changes in microbial community composition, with bacteria dominating over phytoplankton. This shift can decrease biological productivity and affect the global food web.
A joint research group clarifies a key mechanism of how retrotransposons preferentially insert in the centromere. The findings reveal strong integration biases for certain genetic elements, shedding light on rapid genome evolution.
The Virginia Tech analysis extends the chart of life by nearly 1.5 billion years, mapping the rise and fall of ancient life from the Proterozoic Eon. The study reveals that global ice ages accelerated the pace of evolution in species counts.
Two proteins, viperins and argonautes, play important roles in human immunity, originating from Asgard archaea. These defense systems have been passed down for billions of years, providing a crucial line of defense against viruses.
Fossil discovery of microbial eukaryotes from 750 million years ago provides new insights into the evolution of early life and ecosystems. Researchers can now better understand the history of testate amoebae, which are some of the earliest confirmed heterotrophic eukaryotes.
A new study suggests that specific physical conditions during the Snowball Earth era, including ocean viscosity and resource deprivation, may have driven eukaryotes to form multicellular colonies. This finding provides a potential explanation for the long delay in the evolution of multicellularity.
Researchers successfully cultured and analyzed two strains of Meteora sporadica, a small, unicellular eukaryote with a complex cytoskeleton featuring lateral arms supported by microtubules. The study reveals that Meteora sporadica is closely related to Hemimastigophora, a group of deep-branching eukaryotes with no arms or MTOCs.
The discovery of 1.63-billion-year-old multicellular fossils from North China reveals that eukaryotes acquired simple multicellularity approximately 1.05 billion years ago. This finding supports the early appearance of the last eukaryotic common ancestor in the late Paleoproterozoic, consistent with molecular clock studies.
Scientists engineered yeast that can harness energy from light, growing 2% faster in the light than in the dark. This discovery provides key evolutionary insights into how rhodopsins spread across lineages and has potential applications for biofuel production and studying cellular aging.
Researchers discovered diverse microfossils of ancient eukaryotes, including 10 previously undescribed species, that exhibit complex characteristics like cell walls made of bound fibers and tiny trapdoors. These findings suggest that early eukaryotes were already diverse and advanced, with some evidence pointing to an aerobic metabolism.
Researchers use molecular dating approach to estimate moment of LUCA's split into bacteria and archaea, as well as eukaryotes' emergence. The study reveals archaea are younger than previously thought, with some potentially living hidden on Earth.
Researchers successfully cultured Rhabdamoeba marina from Japanese seawater, revealing its genetic sequence and clarifying its phylogenetic position. The study suggests reclassification into Chlorarachnea due to its close relationship with chlorarachnid algae.
Researchers have engineered a chromosome entirely from scratch, contributing to the production of the world's first synthetic yeast. The tRNA Neochromosome forms part of a wider project that has successfully synthesised all 16 native chromosomes in Saccharomyces cerevisiae, common baker's yeast.
Researchers isolated five strains of Minorisa from Japanese coastlines and identified three new species: M. fusiformis, M. magna, and M. megafusiformis. These discoveries reveal the previously unknown diversity within the genus Minorisa and provide opportunities to study their ecological role.
A recent study found that apoptotic factors in eukaryotes have a bacterial or mitochondrial origin, suggesting conservation over 1.8 billion years. The researchers proposed an alternative scenario where early protoeukaryotes domesticated bacteria to produce toxins, which eventually evolved into apoptotic factors.
Researchers investigate protists in Lassen Volcanic National Park's hot and acidic geothermal lake to gain insight into their evolution and genome biology. They aim to understand how these organisms adapted to survive in extreme environments, which could expand the understanding of life's potential habitats.
The study reveals extensive genome size variation among closely related algal strains, with a more than twofold range of approximately 450-1,100 megabases. Genome-wide copy number variation, rather than duplication or proliferation, drives this dynamics, suggesting rapid changes in genome size through frequent duplications and deletions.
A research team sheds light on Dmc1 filament assembly mechanisms using single-molecule experiments. Swi5-Sfr1 and Hop2-Mnd1 proteins regulate Dmc1 assembly through distinct mechanisms, promoting efficient strand exchange during homologous recombination.
Researchers from IMBA identify a family of virus-like transposons called Mavericks that facilitate horizontal gene transfer (HGT) between reproductively isolated worm species. The study reveals the role of Mavericks in overcoming the species barrier, with potential applications in pathogen control and genomic innovation.
Researchers have discovered that eukaryotes, including plants, animals, and fungi, share a common ancestor among the Asgards. The team identified a newly described order called the Hodarchaeales as the closest microbial relative to all complex life forms on the tree of life.
Researchers have discovered a new record of protosteroids in Earth's Middle Ages, extending the current molecular record of eukaryotes to 1600 million years ago. This finding provides a rare glimpse into the conditions surrounding the evolution of complex life and may shed light on the competitive demise of ancient eukaryote groups.
Researchers have identified a new group of mitochondrial viruses confined to arbuscular mycorrhizal fungi Glomeromycotina, which may represent an ancestral lineage of mitoviruses. These large duamitoviruses possess distinct characteristics and are globally distributed in ecological niches occupied by glomeromycotinian fungi.
Researchers have proposed a new evolutionary model for the origin of the Bamfordvirae kingdom of viruses, suggesting a billion-year evolutionary arms race between two groups and their hosts. The study reveals strong evidence against a sister relationship between adenoviruses and NCLDVs, instead supporting a common ancestor with Mavericks.
Researchers discovered a protein involved in membrane remodeling in cyanobacteria, structurally similar to eukaryotic membrane proteins, suggesting it may be the oldest known bacterial ancestor. The protein, SynDLP, was found to have structural properties that match those of eukaryotic dynamin.
Research team used genome models to test viability, persistence, and evolvability of prokaryote endosymbioses, finding that more than half were viable but often less fit and adaptable than their ancestors. The study suggests metabolic network compatibility is unlikely the limiting factor in prokaryotic endosymbiosis.
Horodyskia, a fossil with uniform size and spacing, is among the oldest multicellular macroorganisms. Its fossils suggest coenocytism and simple clonal coloniality, challenging previous interpretations.
Researchers found an increase in biologically available nitrogen during the time when marine eukaryotes became dominant, leading to a new era for life on Earth. This discovery links ancient ocean records to the present and beyond, providing context for global changes.
A team of researchers has identified a molecular switch that regulates autophagy in plants, bridging two quality control pathways. The study reveals that this regulatory mechanism is conserved in eukaryotes and essential for preventing cells from 'eating' healthy cellular components.
Researchers at the University of Vienna and ETH Zurich have successfully cultivated a representative of the Asgard archaea, a group believed to be the closest relatives of eukaryotes. The newly developed model organism, Lokiarchaeum ossiferum, exhibits unique cellular characteristics, including an extensive cytoskeleton and complex cel...
Researchers uncover five new types of microfossils in the Gunflint Formation, including colonial, ellipsoidal, and spinous forms. These discoveries suggest that prokaryotes began diversifying their functions before the emergence of eukaryotes, providing insights into the evolution of life on Earth.
A recent study has revealed that the great current diversity of eukaryotes is largely due to the large number of habitat transitions between sea and land over millions of years. Microbial eukaryotes have made hundreds of leaps from one habitat to another, allowing them to occupy vacant ecological niches.
A new study challenges a popular scenario explaining the origin of eukaryotes, suggesting that cells can grow to considerable volume without acquiring mitochondria. Researchers explore energy requirements and genome arrangement in prokaryotes and eukaryotes, revealing overlap between cell types rather than a hard boundary line.
An international team has uncovered that eukaryotes have made hundreds of big leaps from sea to soil and freshwater habitats during their evolution. This reveals that adapting to a different salinity is difficult, even for microbes, but still allows them to occupy vacant ecological niches.
Researchers discovered new viruses infecting Asgard archaea, which may hold clues to the origin of complex life. The viruses share features with both prokaryotic and eukaryotic viruses, offering a new perspective on viral eukaryogenesis.
A team of scientists has discovered a novel magnetotactic bacterium that forms intracellular amorphous silica globules. This finding suggests a previously unobserved influence on the global silicon cycle during early Earth history, expanding our knowledge of prokaryotic biosilicification.
Researchers at the Center for Genomic Regulation (CRG) found that chromatin, a genetic architecture that protects DNA and regulates gene expression, originated in ancient microbes between 1-2 billion years ago. This eukaryotic innovation has been essential for life since its emergence.
Researchers at the University of Illinois have successfully engineered artificial photosynthetic life-forms through endosymbiosis between cyanobacteria and yeast. The engineered chimera can survive and reproduce under optimal conditions, shedding light on the evolutionary origins of eukaryotic cells.
Eukaryotes emerged in an anoxic environment in the ocean, and their mitochondria-bearing cells likely resulted from a merger between archaea and bacteria. This finding contradicts the long-held view that oxygenation of Earth's surface environment led to eukaryogenesis.
Researchers used new techniques to uncover the Tetrahymena electron transport chain, revealing gaps in our knowledge of a major branch of life. The study highlights the power of structural biology and shows potential as a discovery tool for biodiversity research.
A new mechanism has been discovered that decorates the end tails of RNA molecules in a parasite causing sleeping sickness, preventing their degradation and potentially increasing virulence. This fundamental discovery opens new avenues for treatment strategies for this disease, as well as other RNA-based infections/diseases.
University of Ottawa scientists, collaborating with Yale researchers, have discovered the hidden influence of a single variation between histone H3.1 and H3.3 proteins. This finding could expand our understanding of DNA damage repair and its role in diseases like cancers and sponastrine dysplasia.
A team of researchers has discovered a novel epigenetic mark in bdelloid rotifers, small freshwater animals, that allows them to control jumping transposons. This marks the first time a horizontally transferred gene has reshaped the gene regulatory system in a eukaryote.
Researchers at Uppsala University discovered that the ancestors of Legionella bacteria infected eukaryotic cells around 2 billion years ago. This finding challenges the chicken-or-egg debate about which came first, phagocytosis or mitochondria evolution.
New research reveals that gene exchange between viruses and their hosts plays a major role in shaping the tree of life. The study found that viruses acquire genes from their hosts to hone their infection process, while also co-opting useful viral genes from hosts.
A new study suggests that climate change is displacing cold-water communities of algae with warm-adapted ones, threatening to destabilize the delicate marine food web. The research found a clear boundary between these communities at moderate water temperatures, highlighting the vulnerability of polar ecosystems.
Researchers analyzed Raman spectral analysis data from nine geological formations to estimate oxygen levels during the Proterozoic Eon, finding minimum oxygen levels were 2-20% of present levels. This suggests that oxygen did not hinder eukaryote and early animal evolution during this time period.
Researchers found that some foraminifera species can survive and even thrive in hypoxic and anoxic sediments, suggesting a new direction for studying past environmental conditions. The study also revealed diverse metabolic strategies used by these organisms to adapt to low oxygen conditions.