Articles tagged with Evolutionary Genetics
Researchers at the American Museum of Natural History contributed to a study analyzing over 2,300 species in Madagascar to develop a more efficient conservation plan for the country's unique biodiversity. A new phylogenetic tree of multicellular animals has also been redrawn by comparing genetic data from diverse animal phyla.
A K-State biology professor is studying the evolution of the state flower, sunflower, using a $610,000 grant from the National Science Foundation. The research focuses on how environmental stress may have caused the activation of retrotransposons in hybrid species, leading to massive genomic expansion and restructuring.
Researchers discovered a preference for certain DNA letters across intron regions and the opposite preference in coding regions, affecting at least a third of the genome. This finding supports previous studies suggesting that non-coding DNA is biologically important.
A new genetic analysis by Yale School of Medicine researchers suggests that a genetic variant in East Asian populations may have protected residents from becoming alcoholics. The study found that this variant became widespread through natural selection in specific Hmong- and Altaic-speaking groups, hinting at an environmental factor.
A new study by Yale and Washington University researchers challenges the idea that complex traits have a 'cost of complexity,' suggesting that many mutations only affect a small number of traits. The team identified genomic regions affecting skeleton characteristics, revealing a well-coordinated process in tuning up complex traits.
Menopause is thought to be an evolutionary adaptation that helps minimize reproductive competition between females in the same family unit. The researchers propose that older women should cease breeding when younger women start to breed, explaining the observed timing of reproductive cessation in humans.
Scientists at MIT have developed a mathematical approach to analyze protein patterns across species to identify natural selection in microbial evolution. By analyzing the 'selective signature' of genes, researchers can infer gene function and understand ecological shifts.
A recent study published in PNAS found that Spanish brown bears have genetic material from bears in other parts of Europe, challenging the idea of their isolation. The research, led by Anders Götherstam and Cristina Valdiosera, analyzed DNA sequences from prehistoric material and discovered a unexpected pattern.
Researchers found that milk-protein genes arose in the mammalian common ancestor and preceded the loss of egg protein genes. This transition allowed mammals to feed their young via the placenta and with milk, abandoning eggs as a source of nutrition. The study provides insights into the origins of lactation and placentation in mammals.
Scientists have discovered that ants deliberately spread their offspring with 'royal' genes to avoid detection and maintain an unfair advantage in queen selection. This genetic cheating undermines the notion of egalitarianism in ant societies, revealing a complex web of conflict and cooperation.
An invasive population of the freshwater snail Melanoides tuberculata shows a tremendous amount of genetic variation for key life-history traits, allowing for large potential for evolutionary change. This diversity can arise from multiple invasions and amplification through sexual reproduction.
The International Giant Panda Genome Project aims to sequence and assemble the giant panda's draft genome within six months. The project will aid in understanding the genetic and biological underpinnings of this unique species, informing conservation efforts and advancing sequencing technology.
A new study found that chickens have a different version of a gene that codes for white skin, but the yellow-skin variant is present in a completely different wild species, grey junglefowl. This discovery contradicts Charles Darwin's theory that all chickens came from a wild red junglefowl species.
Researchers found that genetic reassortment events led to the creation of new hybrid viruses in humans during severe influenza epidemics in 1947 and 1951. This challenges the standard model of human influenza virus evolution, suggesting a more complex co-circulation of multiple forms of the same strain.
Psychologists Agneta Herlitz and Jenny Rehnman found significant sex differences in episodic memory, favoring women. Women excel in verbal episodic memory tasks and are better at remembering faces, especially of females.
Researchers have speculated that the Foxp2 gene is linked to language ability, but MIT's Robert Berwick argues this connection is unlikely due to complexity and speculative chain of events. Language is likely the result of a subtle interplay among various factors, making direct genetic connections impossible.
A new study using molecular genetic data confirms that modern birds originated more than 100 million years ago, contradicting earlier fossil-based estimates of around 60 million years ago. The analysis suggests that both the fossil record and molecular clock methods have limitations in dating biological events.
Researchers discovered a significant amount of variation in genetic recombination events among individuals, with some hotspots being used more by one sex. The study found heritable differences in recombination rate and hotspot use, which could provide insights into the evolution of recombination rates.
A Penn State University research team investigated the simultaneous effects of numerous factors on microsatellite mutability, finding that repeat number, length, and composition are significant predictors. The study has applications in medical genetics, forensics, and conservation genetics.
Researchers at Fred Hutchinson Cancer Center discovered that rapid evolution of protein ZAP is associated with increased antiviral activity in humans. The longer human ZAP protein isoform has higher antiviral activity against various viruses, including alphaviruses and filoviruses.
Researchers found that a protein produced by an immunity gene called ZAP has increased antiviral activity in humans, linked to evolutionary changes. The study suggests that studying evolutionary biology and virology can accelerate the discovery of viral-defense mechanisms.
Genes have been found to recognize similar patterns of chemical bases without physical contact, shedding light on the process of homologous recombination. This ability could explain how genes group together to perform key processes involved in species evolution.
Researchers have developed a method to measure the reproductive value of female side-blotched lizards, revealing that large clutches are associated with increased survival rates. Male lizards also exhibit improved survival with small clutch sizes due to hormonal changes, highlighting an 'ontogenetic conflict' between the sexes.
Researchers found that dark coat color is linked to genes reducing fitness, contradicting Darwin's theory. The study reveals that light-coated sheep have higher reproductive success despite being smaller.
A recent study has found that human genes have evolved additional safeguards to boost the p53 regulatory network's ability to guard against DNA damage. This enhancement is thought to be linked to humans' increased need for coordinated control of molecular repair activities during DNA replication.
Researchers successfully switched a gene regulatory element from a bat to a mouse, resulting in abnormally long forelimbs. This study demonstrates that evolution can be driven by changes in gene expression patterns, rather than solely genetic changes.
This special issue of the International Journal of Plant Sciences presents exciting research on flower evolution, pollination, and reproductive strategies in flowering plants. The focus is on evolutionary transitions, which are key elements of biological diversification.
Research shows that blind cavefish populations can regain vision in their offspring through hybridization, highlighting genetic differences behind eye loss. The study found that mutations in distinct genes are responsible for eye loss in separate lineages, which can be compensated by good gene copies in hybrids.
A new study reveals that large numbers of modern-day beetle lineages evolved soon after the first beetles originated and have persisted ever since. The team used DNA sequencing and fossil records to compile an evolutionary family tree for beetles, showing that many species pre-date the appearance of flowering plants.
New research identifies a second gene, TRIM22, that exhibits rapid evolutionary adaptation to defeat retroviruses, suggesting alternate defense mechanisms over time. The study suggests that both TRIM5 and TRIM22 have played roles in protecting humans against retroviral infections.
Research on frogs and giraffes reveals three distinct species of terrestrial leaflitter frog and at least six genealogically distinct lineages of giraffe, highlighting underestimated biodiversity. The findings suggest that some subspecies have fewer than 100 members, making them highly endangered.
Researchers found that a common genetic mechanism, involving the Kitlg gene, is responsible for the evolution of skin pigmentation in both fish and humans. This discovery reveals a surprising parallel between the evolutionary history of stickleback fish and human populations.
A new study suggests humans are evolving rapidly, with genetic differences accelerating on a continental scale. The pace of change has accelerated in the last 40,000 years, especially since the end of the Ice Age, leading to increased divergence among human populations.
A recent genome study found that positive selection has occurred at a rate roughly 100 times higher in the past 5,000 years compared to other periods of human evolution. The study, led by University of Wisconsin-Madison anthropologist John Hawks, identified 1,800 genes with recent genetic changes, driven by major cultural shifts such a...
A genetic study suggests that gorilla populations' geographic variation may be tied to Ice Age climate change and river barriers. Regional differences in gorillas were shaped by 'refugia' that harbored suitable habitat remnants.
Researchers have identified a natural compound, sulforaphane, found in broccoli that may treat a genetic skin disorder called epidermolysis bullosa simplex (EBS). Sulforaphane has been shown to induce the production of missing keratins in basal epidermis, potentially restoring skin integrity in EBS patients.
Researchers have developed a new method to reconstruct the evolutionary history of the HIV-1 V3 loop, revealing biologically dependent amino acids that form 'co-evolving' ties across the protein. This study advances understanding of HIV-1 evolution and identifies potential targets for future research.
Researchers found that males' simpler genetic architecture enables them to evolve faster and more efficiently in response to sexual selection. This is because males have only one X chromosome, making their inheritance pathway less complicated compared to females, who have two X chromosomes with interacting genes.
A study by Deem and Jun Sun found that genetic information becomes increasingly modular when exposed to a changing environment and horizontal gene transfer. This modularity arises spontaneously due to selective pressure, resulting in complex biological structures.
Scientists have identified a new genetic lineage of the Ebola virus in great apes, which contradicts previous assumptions about its evolutionary development. This discovery suggests that wild strains of Ebolavirus can exchange genetic material through recombination processes.
Researchers found that animals, like plants, can build tolerance to infections at a genetic level, allowing them to withstand parasite loads. This tolerance is negatively related to resistance, with animals either killing or tolerating parasites but not both.
A new study by Penn State University finds that colugos, also known as flying lemurs, are the closest living relatives of primates. The researchers used molecular and genomic data to analyze the evolutionary relationships among three groups: primates, colugos, and tree shrews.
University of Michigan scientists found a significant connection between the lipid PI(3,5)P2 and neuronal health, revealing potential treatments for neurodegenerative diseases like Alzheimer's. Lowered levels of this signaling molecule lead to massive neurodegeneration in mice.
Research by biologists at the University of Bonn found that older coal tit males produced significantly more 'cuckoo kids' than younger males. In contrast, younger males father only 0.3 extra-marital offspring on average.
Two scientists report a new type of mouse replaced an old type in Volo Bog between 1976 and 2001, with genetic differences apparent in just 25 years. The study suggests that environmental changes can drive rapid adaptation in animal populations, highlighting the need for conservation efforts.
Researchers have identified same-sex mating in nature through analysis of natural hybrids and laboratory observations, shedding light on the evolution of Cryptococcus neoformans population structure. The study provides new insights into the genetic and environmental factors driving the current population's sex-ratio imbalance.
Researchers found two genetic SNPs influencing metabolic efficiency in Pima individuals, which helped them survive the Sonora desert's harsh environment. These findings suggest that similar SNPs may contribute to obesity globally.
UCSB researchers have discovered a key milestone in the evolution of animal vision, finding evidence of light-sensitive genes in ancient aquatic animals. The study, published in PLoS ONE, suggests that animal vision emerged around 600 million years ago.
Researchers develop formula to study linguistic evolution, predicting irregular verbs will regularize at a rate inversely proportional to their usage frequency. The most common irregular verbs, such as 'be' and 'think', are expected to remain irregular for thousands of years.
A team of researchers has demonstrated how a single gene in yeast divides and adapts to improve its environment, showcasing the driving force of natural selection. This study provides the most basic view of how organisms evolve to better adapt to their environments.
A KGI professor's research reveals a mechanism for the self-repair of DNA at jumping gene locations, challenging instability theories. The study provides insights into the evolution of moveable genetic elements and their implications for plant genetics and molecular evolution.
Researchers found that quail males who learned to associate a stimulus with access to a female were more likely to fertilize eggs, increasing their reproductive success. The findings suggest that learning plays a significant role in reproductive fitness and evolution.
A new study by Oregon State University reveals that rearing steelhead trout in hatcheries causes a dramatic drop in their ability to reproduce in the wild, with reproductive success dropping by up to 40% per generation.
Researchers at UF discover a powerful link between protein evolution and metabolic rate across various species, including fish and mammals. The study reveals that rates of protein evolution are strongly influenced by individual metabolic rates.
The study found that plants without the linamarase enzyme lack the Li gene, while those with it produce cyanogenic glucosides. Researchers are testing hypotheses on why acyanogenic plants occur in cold climates, including the possibility of plant suicide due to frequent frosts.
The complete genetic sequence of Giardia lamblia has been completed, revealing opportunities for new drug and vaccine targets. The parasite's genome shows unusual proteins that could be exploited to treat or prevent infections.
A new UC Davis study explores how competition among genetically varied plants relates to species diversity, finding that diversity within a species is necessary for maintaining diversity among species. The research also highlights the importance of preserving biodiversity in plant communities.
Researchers at the University of Helsinki discovered that a weak inhibitory cascade in mouse molars may cause the last molar to develop in humans. They developed a mathematical model predicting tooth proportions and numbers across various species, including humans.
Research suggests that genetic factors influence women's choices about parenthood, and that this may lead to a shift towards more traditional family structures. Dr. Lonnie Aarssen argues that biological evolution will drive future generations of women towards having children as a priority.
The study used knockout mice to test the hypothesis that ultraconserved elements are vital for life, but surprisingly found that mice lacking these elements were viable and fertile. The results suggest that the presence of ultraconserved elements is not required for organism viability.