Articles tagged with Evolutionary Genetics
A new study published in Science demonstrates that microRNAs affect the expression or evolution of the majority of human genes. The researchers found that nearly all genes contain short sequences matching microRNA target sites, which are evolutionarily conserved across species.
A Stanford study reveals that the sea squirt Botryllus schlosseri uses a gene similar to the human immune system to distinguish between self and non-self. This finding may lead to new ways to control natural killer cells and treat diseases like leukemia and multiple sclerosis.
A comprehensive genetic analysis of snakes, lizards, and other scaly reptiles has revealed surprising relationships among the animals. The study places primitive-looking iguanian lizards at the top of the tree, near advanced lineages like snakes and monitor lizards.
Researchers analyzed the history of metabolic genes acquired by E.coli bacteria over 100 million years, finding that approximately 25 genes were added through horizontal gene transfer. This mechanism allows bacteria to evolve new functions and adapt to changing environments, rather than improving existing performance.
Researchers have found that two genetic conditions, sickle cell trait and a mild version of thalassemia, offer natural protection against malaria but can be rendered ineffective when occurring together. This study of Kenyan children highlights the complexity of genetic interactions in naturally acquired immunity.
A 'Perception' gene tracked by scientists suggests regulation of this gene played a crucial role in the evolution of modern humans' mental capacity. The gene, prodynorphin, is implicated in pain perception, social attachment, learning and memory.
Researchers mapped how genes are shared between bacteria through lateral genetic transfer, a process where genes are transferred between unrelated organisms. The study reveals that this phenomenon is widespread and can occur even between distantly related organisms, contributing to the rapid spread of disease-causing bacteria.
A new study finds that sea otters played a key role in driving up the size of abalones in California's coastal kelp forests. The researchers speculate that by preying on sea urchins and smaller snails, otters allowed abalones to thrive and grow huge on abundant kelp.
Researchers discovered that changing an embryo's genetic elements can alter its adult fish jaw structure and function. The study revealed a complex link between embryonic development and biomechanical systems, with specific genes controlling different aspects of the lower jaw.
Researchers discover bmp4 gene plays key role in regulating craniofacial diversity, with implications for understanding human craniofacial defects and preserving species biodiversity. The study provides new insights into the mechanisms underlying biodiversity and offers possibilities for exploring what genes make a head.
Scientists have discovered that large structural changes in the genome, called inversions, may account for much of the evolutionary difference between humans and chimpanzees. These inversions also shed light on genetic changes that lead to human diseases.
A recent UCSD study shows that non-coding regions of DNA, often referred to as 'junk' DNA, are essential for maintaining an organism's genetic integrity and play a crucial role in evolutionary survival. These findings suggest that these regions are not functionally inactive but rather provide resistance to new mutations.
Researchers found that mating between two less harmful fungal strains of the same sex produced a more virulent form, which has taken hold and is spreading. The fungus, C. gattii, infects individuals with normal immunity, causing symptoms like persistent headaches and coughing.
A study published by Yale University scientists analyzed the genetics of quagga and plains zebra populations to understand how the quagga evolved its distinctive stripes. The research found that the quagga diverged from Plains zebra around 120,000-290,000 years ago during the Ice Age.
A study suggests that the evolutionary history of tuberculosis is linked to historical patterns of human migration. The researchers found that the genetic signatures of over 300 strains of Mycobacterium tuberculosis reflect the dispersal and evolution of the pathogen according to human migration patterns, with a strong gender bias obse...
Researchers identified a single crystallin gene in sea squirts that likely evolved into the ß?-crystallins responsible for forming the vertebrate eye lens. The study found a regulatory link between these genes, suggesting a co-opted mechanism in early vertebrates.
Researchers found that the human Y chromosome has stabilized itself over 6 million years, while the chimpanzee Y chromosome is accumulating mutations making its genes useless. The human Y's ability to defend itself is due to carrying spare copies of testis-expressing genes.
Researchers used genome synteny to study two closely related flower genes, AGAMOUS and PLENA, in Arabidopsis and Antirrhinum. They found that the genes originated from a single duplicated event around 125 million years ago.
A recent study using ancient DNA extracted from fossilized bones of extinct American big cats has shed new light on their evolutionary history. The research reveals that the saber-toothed cats were a sister group to modern felines and diverged early on from their ancestors.
The study found age-related changes in gene expression in the human brain's cortex, but not in non-brain tissues. The results support a theory that DNA damage and protein degradation contribute to aging, with more metabolically active tissues showing greater gene activity reduction.
A team of scientists led by Michael Russello has discovered a new taxon of Galápagos tortoise, characterized by distinct genetic features. The discovery highlights the importance of accurate taxonomy for effective conservation policy and preservation of genetic diversity in these endangered species.
A study of twins and their partners/friends reveals a strong genetic component to our tendency to seek out people like ourselves. The researchers found that 34% of preference for similar mates was due to shared genes, with the greatest self-similarity seen in more heritable items.
Researchers found that holly trees can serve as an indicator of climate change due to their adaptability and ability to thrive in changing environments. This is attributed to the tree's flexibility, allowing it to survive in a range of conditions.
A recent study using ancient DNA reveals that South American horses diverged from North American caballines around 3 million years ago. The research also suggests that all North American caballines belong to the same species and convergently evolved morphologically.
A new study overturns decades-old theory, suggesting that gene mutation rates can affect fixation rates in species. The research found that faster mutations are more likely to be accepted by genes, leading to a shift in the understanding of natural selection.
Researchers have identified a new mechanism of resistance to CMV, involving the interaction between two genes that flag infected cells for destruction and allow Natural Killer cells to recognize and terminate them. This discovery increases the likelihood of therapies being developed to fight CMV.
An international team has determined the complete genetic blueprint of Dictyostelium discoideum, a simple social amoeba long used by researchers to gain insight into human diseases. The genome contains nearly twice as many protein coding genes as previously thought and provides a new tool for studying human disease.
A study comparing human and chimpanzee genomes identified genes involved in sensory perception and spermatogenesis, as well as a strong link between immune defense and positive selection. The authors suggest that an evolutionary arms race may have driven the development of tumor-suppressor and apoptosis genes.
The new technique improves specificity of human estrogen receptor alpha by 100 million times, allowing for targeted activation or deactivation of genes in living systems. This breakthrough could lead to advances in gene therapy, metabolic engineering, and animal disease model studies.
Researchers found genetically similar fish in ecologically similar habitats across vast distances, contradicting the idea that geographical barriers drive speciation. This discovery supports ecological speciation and suggests a new approach to understanding biodiversity evolution on land and sea.
A Stanford study reveals that a single genetic mutation, Eda, is responsible for the evolutionary adaptation of freshwater fish losing their body armor, allowing them to thrive in lighter environments. This discovery provides insights into how animals adapt to new conditions and challenges previous assumptions about evolution.
The study found that one gene, Eda, controls the armor-plating trait in stickleback fish, which evolved rapidly after ocean fish colonized new environments. This suggests that evolution can occur quickly with just a few genes changing slightly, allowing newcomers to adapt and populate new habitats.
Researchers discovered RNA loops and knots play a crucial role in A-to-I RNA recoding, enabling species-specific editing of proteins. By understanding these molecular structures, scientists can gain insights into the genetic code and improve our ability to interpret genome information.
Researchers discovered a retrovirus in the chimp and gorilla genome that didn't appear in human DNA. The virus, which affected ape species between three to four million years ago, may have driven evolutionary changes in chimps and gorillas.
Researchers found that genetic diversity of the Mlabri is significantly lower than other agriculture-based hill tribes, indicating a severe population reduction around 500-1000 years ago. This reverts previous assumptions that contemporary hunter-gatherer groups represent pre-agricultural human populations.
The study analyzed a dataset of 107 plants and animals, showing that the opportunity for selection to act on a gamete can influence recombination rates. The researchers found that strong selection on female gametes could lead to lower recombination rates in females.
Dr. Brooks' research highlights the link between biodiversity decline and emerging human and wildlife diseases, such as West Nile Virus and avian flu. He argues that understanding parasite life cycles is crucial to preventing these diseases.
A team of Wisconsin scientists discovered molecular switches that govern the development and evolution of form in animals. The study found that genetic changes to these switches can produce diverse patterns and features, such as spots on fruit fly wings or stripes on zebras, which confer advantages for survival and reproductive success.
Researchers discover a new paternal effect gene in Drosophila that has a relatively recent origin, overturning the theory that genes with vital functions must have been created long ago. The gene's evolution raises questions about why and how it emerged.
Researchers found that human genes are less carefully controlled due to a small population size, leading to increased disease risk. The study suggests that natural selection would have overridden harmful mutations with a larger population.
Researchers use genetic analysis to trace a genetic gradient across distance, challenging the theory of speciation by distance. The findings have broad implications for conservation approaches, highlighting the importance of preserving gradients of forms rather than well-defined groups.
Researchers at McMaster University have used ancient DNA to study the evolution of the Haast's eagle, a giant bird that once ruled New Zealand. The study found that the species is related to one of the world's smallest eagles, with an estimated common ancestor living less than a million years ago.
Researchers at Oxford University extracted DNA from fossil eagle bones to study the extinct Haast's eagle, which was related to a small Australian wedge-tailed eagle. The eagle grew to be massive due to abundant prey and lack of predators.
A study found that genes controlling brain development and function evolved significantly faster in the human lineage than in other species. This suggests that strong selective forces favored larger and more complex brains, leading to a dramatic speeding up of evolution.
Researchers discovered human brain evolution accelerated due to intense selection favoring complex cognitive abilities. Brain-related genes evolved faster in humans and macaques compared to rats and mice. Many genes, including those controlling brain size and behavior, were impacted by this selective process.
Researchers found that increasing one skill can significantly impact others, with some activities dropping and others increasing in levels. The primary function of the enzymes remained largely unchanged despite changes in other promiscuous traits.
Researchers at UT Southwestern Medical Center propose a new theory explaining the rapid evolution of species and their physical variations. They found that tandem repeat sequences in genetic code can lead to significant morphological changes, driving evolutionary changes and variability in appearance among individual members of a species.
A study in the Royal Society journal explores genetic factors in social responsibility, finding that genes play a significant role in shaping attitudes. The research also examines the potential for Argentine ants to spread globally due to climate change, highlighting the importance of preventive measures.
The coelacanth, an ancient fish with unchanged physical features since 360 million years ago, has a sequenced genome that reveals its slow evolution and genetic similarities with land animals. The genome analysis may hold the key to understanding how life transitioned from water to land.
Research by Queen's University finds that northern plant populations switch from sexual to asexual reproduction due to genetic factors causing sterility. This shift allows for faster adaptation to harsher environments, but may impact management decisions and species survival.
A new fossil discovery in Edmonton provides crucial insights into the evolution of brown bears in North America. The ancient fossil, dated to around 26,000 years ago, reveals that brown bears migrated south of Beringia much earlier than previously believed, with some populations reaching as far as southern Canada and the northern US.
Researchers found a clear correlation between female promiscuity and rapid evolution of the semenogelin protein in various primate species. This suggests that intense sexual competition drives genetic adaptation, with genes evolving faster in species with more promiscuous females.
A study by Dr. Richard Palmer challenges the classical Darwinian theory, suggesting that environment plays a crucial role in creating differences and variations in species. The research found that variations without genetic basis are common and important for evolution, especially in asymmetric forms.
Studies suggest that maximum parsimony, a simpler method, is more accurate than maximum likelihood in inferring historical relationships among species. The results published in Nature challenge the state-of-the-art technique's accuracy and highlight its limitations.
Researchers suggest genetic factors favoring male homosexuality could increase female fecundity, resolving the Darwinian paradox. This study provides evidence for inherited factors in homosexuality, exploring its implications on population dynamics.
The study reveals a highly complex maize genome with approximately 59,000 genes, twice as many as the human genome. This complexity is due to positional instability and genetic history, allowing maize genes to move around the genome in a way not seen in other species.
Researchers found that pleiotropy plays a crucial role in preventing 'cheaters' from exploiting their neighbors in slime mold colonies. The study reveals a molecular block to cheating and its link to the essential function of reproduction.
Head lice analysis suggests that modern humans (Homo sapiens) and archaic humans (Homo erectus) carried distinct types of lice. The study proposes a scenario where the New World louse evolved on an archaic form of humans before transferring to a modern version.
Researchers discovered that a type of plant TE called MULEs can capture and fuse rice gene fragments to create new genes and functions. This process, known as Pack-MULEs, may be an important mechanism for evolutionary change in plants.
Researchers at Washington University in St. Louis found that genetically distinct populations of brown lizards (Anolis sagrei) introduced to five countries can be traced back to Florida. The study, which analyzed DNA from over 600 individuals, suggests that the Sunshine State is a key site for species migration.