Articles tagged with Vertebrates
A new study supports the Lilliput effect, where mass extinctions lead to temporary size reductions in species. Smaller vertebrates with higher reproductive rates and shorter lifespans were more resilient to extinction events, while large vertebrates struggled to adapt.
Researchers used electron microscopy to study the dynamic process of myoblast fusion with muscle cells, revealing a series of distinct stages that require communication between transmembrane elements and actin cytoskeleton. The study provides insights into understanding muscle development and repair processes in vertebrates.
Researchers found that existing malaria infections in mosquitoes facilitate replication of secondary infections, leading to higher parasite loads. This could disproportionately contribute to malaria transmission, especially if control measures focus on reducing mosquito feedings.
A tiny tooth plate fossil, dated to over 40 years of neglect, has revealed new insights into the earliest origins of teeth in vertebrates. The study's findings suggest that teeth evolved from body scales in primitive fishes, pushing back their origin on the evolutionary tree.
French scientists have discovered that vertebrate formation is guided by a pattern present from early development stages, with folds along boundaries of elastic contrast forming the final shape. This finding explains how complex structures like vertebrates emerged during evolution.
A 415 million-year-old fish fossil suggests that humans and sharks share more primitive features than previously thought. The ancient creature, named Janusiscus, has a mix of cartilaginous and bony fish-like characteristics, which challenges the current classification of sharks as 'primitive'.
Researchers analyzed endogenous retroviruses to understand long-term interactions between viruses and hosts, finding that retroviruses are widespread across vertebrates and can switch among distantly related hosts.
Researchers have discovered microexons, small gene fragments critical for neuron maturation, providing a new understanding of genome regulation. The study found that these tiny exons play a key role in developing neurons and are highly conserved across vertebrates.
The study suggests that expanding protected areas by 17% could triple current protection levels and deliver a 50% more efficient result globally. However, land-use change threatens this opportunity, putting over 1,000 species at risk of losing up to 50% of their habitats.
Researchers discovered that as mice age, their primary DNA repair process fails and is replaced by a less effective mechanism, leading to increased mutations in critical tissues. This finding may explain why damaged DNA contributes to aging-related illnesses like cancer.
Researchers found that DNA sequences called enhancers find their targets hours before activation during embryonic development, with surprising complexity in fruit fly embryos comparable to vertebrates. The study reveals a primed system ready to spring into action when needed.
The fossil, Eocasea martini, provides evidence that large caseid herbivores evolved from small carnivorous ancestors. This finding contributes to our understanding of the early evolution of herbivory in terrestrial vertebrates.
Researchers used micron resolution X-ray imaging to study the skull of Romundina, an early armoured fish with jaws. The study shows that the face assembly during the evolutionary transition was a gradual process, with key features emerging before the final shape of the jawed vertebrate face.
The Burmese python genome study found large numbers of rapidly evolved genes linked to extreme characteristics such as rapid increases in metabolism and organ growth after feeding. The researchers discovered that snakes have undergone incredible changes at all levels of their biology, including physiological and molecular changes.
Scientists have re-examined the evolutionary origin of our skeleton and discovered that it originated from the armor of mud-slurping ancestors. The study found that conodonts evolved tooth-like structures within their own lineage, rather than inheriting them from a common ancestor with other vertebrates.
Research found that crocodylians have unique multi-sensory organs called dome pressure receptors or Integumentary Sensory organs, which grant fingertip sensitivity and detect surface pressure waves. These sensors also help regulate body temperature and detect suitable habitats.
Researchers at Instituto Gulbenkian de Ciencia discovered that the leg plays a crucial role in initiating the transition from trunk to tail tissues during embryonic development. The genetic cascade triggered by Gdf11 signaling is coordinated with the formation of legs and the cloaca, leading to changes in the body plan.
Scientists at OU, Japan, Germany, US, Canada, and Great Britain collaborate to sequence the sea lamprey genome, providing insights into vertebrate evolution and character traits. The study reveals two whole-genome duplication rounds in vertebrates, shedding light on the origins of myelin and paired appendages.
Researchers discovered fossilized tapeworm eggs in 270-million-year-old shark feces, indicating that intestinal parasites in vertebrates are much older than previously known. The finding provides a new timeline for the evolution of present-day parasitic tapeworms.
Researchers used non-invasive X-ray technology to study the jaws and teeth of a primitive jawed fish called Compagopiscis. The discovery provides solid evidence that teeth evolved along with or soon after the development of jaws in early vertebrates, shedding light on our evolutionary ancestry.
A new database allows users to search for information on Florida's endangered species with ease. The tool, developed by a team of researchers, provides access to comprehensive data on threatened and endangered vertebrates in the state.
Researchers release first installment of 500 terabytes of data on whole-brain circuit mapping project. The data provide a detailed picture of individual neurons and their processes, enabling users to explore three-dimensional brain space.
A recent study found that men who hold guns or large kitchen knives are perceived as taller and more muscular than those holding non-threatening objects. The researchers suggest that this pattern may reflect human psychology's tendency to associate size with danger and formidability.
Scientists have found highly similar signaling centers in the acorn worm that direct the formation of its embryonic body plan. This discovery provides unexpected insight into the evolution of vertebrate development and genetics, revealing complex mechanisms for establishing body plans in distant relatives.
Researchers found that MHC genes, which distinguish self from foreign proteins, undergo an 'arms race' with germs, favoring the retention of diverse genes. This diversity is crucial for mounting a defense against novel pathogens.
A team of researchers used advanced imaging techniques to study a 400 million-year-old fossilized jawless fish. They found evidence that the brain of early vertebrates was reorganized before the development of jaws, providing new insights into the evolutionary history of vertebrates.
A study of midshipman fish has identified two distinct groups of neurons controlling sound duration and frequency for social communication. The research provides a simplified wiring diagram for understanding how the brain allows vertebrates to produce sounds, revealing an ancestrally shared brain area that originated in fishes.
A team of researchers analyzed new conodont fossils and developed a 3D model of their feeding mechanism, revealing that these ancient vertebrates used teeth on upper lips and tongue to grasp food. The findings confirm the primitive nature of conodonts and suggest a common ancestor with lampreys.
Researchers study sea squirts' simple body structure to unravel complex mechanisms of heart formation, shedding light on GATA's role in congenital heart defects. Disrupting GATA function independently in the developing gut preserves heart cell identity, while disrupting it in heart precursor cells causes limbo-like state.
Researchers have discovered a remarkable 525-million-year-old fossil of a 'feathered helmet from beyond the clouds,' offering insights into ancient biology and evolution. The find belongs to a group called pterobranch hemichordates, related to starfish and sea urchins.
A new study in Current Biology found that male squid become aggressively after contacting a chemical on female eggs, revealing the first detailed evidence of an aggression-inducing pheromone in any aquatic animal. This discovery challenges previous theories on aggression and highlights the complex communication system of squid.
Research published in Nature reveals that simple marine worms Xenoturbella and Acoelomorpha are distantly related to humans and other complex species. The findings suggest that these organisms have evolved backwards into simpler forms, shedding light on the early stages of animal evolution.
Researchers found fossils dating back 446-444 million years, helping reconstruct the Cordillera Bética's palaeogeography. The discovery also sheds light on the tectonic history and geological history of the region.
Researchers at the Max Planck Institute of Neurobiology found that fruit flies process optical information in a similar way to vertebrates, separating channels and transmitting parallel image sequences. This efficient system allows the brain to save energy, a theory supported by the consistent wiring across various animal species.
Texas A&M University is part of a global conservation study that reviews the status of thousands of species and finds worldwide efforts have fallen short of biodiversity targets. Ongoing global-conservation efforts prevent extinction rates from worsening, with 50 species moving closer to extinction each year.
Researchers used rotting fish to understand the decomposition process, shedding light on soft-bodied creatures that existed 500 million years ago. The findings have improved the accuracy of fossil reconstructions, allowing scientists to better place early vertebrates on the evolutionary timeline.
EMBL scientists uncover counterpart of cerebral cortex in marine worm Platynereis dumerilii, a relative of the earthworm. The finding suggests that the pallium is much older than previously thought and likely evolved as an adaptation to early marine life.
A recent study found that human and other vertebrate genomes contain ancient sequences from deadly virus families, Ebola/Marburgviruses and Bornaviruses. These integrations were likely mediated by movable elements and may provide a selective advantage to the host species, potentially protecting against future infections.
Researchers from Instituto Gulbenkian de Ciencia found that making ribs is an active process in vertebrates, balanced by Hox genes. They discovered a coordinated mechanism controlling the production of both ribs and associated muscles.
Researchers from the University of Leicester used a new method to extract information from 500 million-year-old fossils, revealing that some early vertebrates may have been more complex than thought. The study found that decomposition altered characteristic anatomical features, providing clues for interpreting ancient fossils.
The Institute of Molecular and Cell Biology in Singapore joins an international effort to sequence the genomes of 10,000 species, enabling comparisons between animal and human genomes. This will help scientists understand evolutionary changes and predict responses to climate change, pollution, and disease.
Researchers at the University of Oregon have found that evolution can only go forward, as genetic mutations block paths to ancestral genes. The team resurrected ancient proteins and manipulated them to study reverse evolution, discovering that restrictive mutations act like an evolutionary ratchet, preventing reversal.
Researchers found that HDAC8 deletion causes cranial NCC deficiency, leading to skull dysmorphism and perinatal death. HDAC8 represses homeobox transcription factors that pattern the frontal skull, highlighting its crucial role in epigenetic control of vertebrate skull development.
A study published in PNAS found that the genetic toolkit for fin and limb development is linked to gill skeleton formation in sharks. This discovery provides evidence for an evolutionary connection between fins, limbs, and gills., The research suggests that common developmental programs patterned different anatomical structures.
A research team from Singapore and London has discovered that the elephant shark, a primitive deep-sea fish, possesses three cone pigments for color vision similar to humans. The finding suggests that gene duplication played a crucial role in this process, which may provide valuable insights into human genome evolution.
Researchers discovered that evolutionary changes produced improvements in molecules generating electrical signals in nerves between 550 and 400 million years ago. These innovations contributed to the evolutionary success and diversity of vertebrate animals. The study also found that the same electrical signaling molecules are an effect...
Researchers at Uppsala University shed new light on the origin of jawed vertebrates by studying the fossilized skull and jaws of Ptomacanthus anglicus, a 410-million-year-old fish. The study reveals a complex relationship between this ancient species and modern jawed vertebrates, including humans.
Research published in the journal Genetics shows that fruit flies and humans regulate their circadian rhythms through similar cellular machinery. This discovery provides a viable animal model for circadian research and sheds light on the potential treatment of seasonal affective disorder, insomnia, and possibly some cancers.
Researchers have identified genes controlling snail shell handedness, similar to those used by humans to set up left-right asymmetry. These findings suggest that the same genetic pathway has been responsible for establishing left-right symmetry in animals for 500-650 million years.
A team led by Professor Richard Ford is awarded a $1.85M contract to continue researching biologically-inspired tactical security infrastructure (BITSI) for military computing and disaster relief operations. The project aims to build computers that can protect themselves when under attack, using biological systems as inspiration.
Researchers at Dartmouth College have discovered that microRNAs played a crucial role in the emergence of vertebrates, with diverse regulatory mechanisms driving genome assembly. The study's findings suggest that these tiny molecules were responsible for the origin of unique organs such as the liver, pancreas, and brain.
A study by Alysha Heimberg and colleagues found that microRNAs, previously considered 'junk DNA', are diverse in primitive vertebrates like sharks and lampreys, but less common in invertebrates. This discovery suggests that microRNAs played a crucial role in the evolution of complex organs unique to vertebrates.
The study reveals surprising similarities in the developing CNS of Platynereis embryos and vertebrates, suggesting that the vertebrate nervous system is probably much older than expected. This finding provides strong evidence for a theory that vertebrates and annelid CNS are of common descent.
A philosopher argues that intelligent design lacks testability due to the inability of observations to discriminate between ID claims and competing theories. He also points out that criticism of evolution is not a sufficient test for ID, and auxiliary assumptions about the designer's goals are not independently justified.
Researchers discovered that Ets1/2 transcription factor controls early heart formation in the sea squirt Ciona intestinalis. The signaling molecule FGF also plays a crucial role in this process.
Researchers at Baylor College of Medicine discovered that fruit flies' visual systems are genetically programmed and don't require neuronal activity for formation. This finding challenges the idea that brain wiring needs activity from neurons to function correctly.
Researchers found that BMPs regulate neural patterning in fruit flies and vertebrates, implying a conserved evolutionary process. A unified model of early neural development suggests that at least part of the neural patterning mechanism has been preserved from a shared ancestral organism over 500 million years ago.
Researchers discovered that octopuses generate two waves of muscle contraction to create joint-like bends in their arms, allowing for precise point-to-point movements. This human-like strategy suggests that articulated limbs controlled by joints are the optimal solution for achieving such movements.
The newly discovered Photocorynus spiniceps is not only the smallest fish and vertebrate, but also one of the most unique reproductive strategies in nature. The tiny male anglerfish, measuring just 6.2 mm, attaches to a much larger female and provides her body with everything she needs to reproduce, essentially turning her into a herma...
New analysis confirms a logarithmic relationship between population size and time-to-extinction, providing insights into extinction dynamics. The study also reveals that ten populations exhibiting 'extinction vortices' show deteriorating dynamics as extinction approaches.