Articles tagged with Evolutionary Genetics
Researchers found that glutinous rice originated in Southeast Asia due to a single genetic mutation in the Waxy gene, which suppresses amylose and gives it its sticky composition. The study also suggests that early Asian farmers selectively bred glutinous rice for its desirable traits.
Scientists have developed a new genetic screening technique that narrows the pool of candidate genes from thousands to fewer than 100, potentially speeding up the search for genes responsible for inherited traits. The method combines two established techniques and has been tested on fruit flies, with promising results.
The study provides strongest support for mutation accumulation (MA) theory, proposing that aging results from accumulated mutations of genes kept in check early in life. This theory suggests that genes associated with diseases like Huntington's and cancer have noticeable effects late in life.
Scientists are exploring how molecular genetics can improve classical biological control by finding natural enemies well adapted to target invasive pests. Genetically modified crops with toxins like Bt may also be compatible with natural enemies, offering a new approach to controlling unwanted insect pests.
Studying genetically engineered mice that lack specific PDE4 subtypes, researchers found that inhibition of PDE4D mediates much of the emetic response. The study aims to develop subtype-specific inhibitors effective in airways without affecting other tissues.
A new study reveals three distinct species of African elephants: savanna, forest, and west African. The west African population has been diverging for over two million years and is threatened with extinction due to human activities.
Scientists identify FOXP2 gene as crucial for human language development, but theologians argue that language and culture are complex matters that may require deeper explanations. The study's findings challenge the notion that language is a uniquely human trait, sparking discussion on Catholic views of evolved body vs created soul.
The consortium aims to reveal secrets of the Archaea domain, a grouping thought to include organisms with ancient evolutionary lineages. Researchers will study the structure and function of genes and proteins in this domain.
Researchers Aviv Bergman and Mark Siegal found that complexity of genotypes, rather than natural selection, provides fidelity in development. They argue that functional genetic networks with enough complexity exhibit built-in property of fidelity, unaffected by environmental disturbances or natural selection.
A new cellular evolution theory challenges Darwinian assumptions by emphasizing horizontal gene transfer as the driving force behind cellular life's evolution. This process allowed for the acquisition of alien cellular components, including genes and proteins, to promote evolutionary change.
Scientists tested the founder effect model in a natural population of Silvereye birds, finding that speciation occurs gradually, not suddenly. The study challenges long-held assumptions about genetic diversity in island bird populations.
A new genetic adaptation allowed Yersinia pestis to be transmitted through the bite of an insect, a discovery that sheds light on the evolution of the plague bacterium. The enzyme PLD plays a critical role in the survival of Y. pestis in the midgut of fleas.
Researchers at Princeton University developed a mathematical method to predict the coming year's flu strain based on previous years' genetic sequences. The approach identified clusters of genetically similar viruses that tend to dominate in each season, with an accuracy rate comparable to existing methods.
A recent genome study by Penn State researchers overturns a popular hypothesis on species relationships between humans, fruit flies, and nematode worms. The classic Coelomata hypothesis was based on the comparison of structural similarities among these species, but the new findings support this long-standing theory.
A researcher has found a key genetic change that separates the spineless from the backboned, revealing how an old gene gave birth to new ones. The study sheds light on the evolution of developmental programs in animals, including the adaptation of T-box genes in humans and other species.
A recent study published in Science reveals that chimpanzees and humans have strikingly different patterns of gene expression in the brain, with humans exhibiting accelerated evolutionary change. This difference may hold clues to understanding medical traits such as AIDS, malaria, and Alzheimer's disease.
Researchers propose that social insects like ants, bees, and wasps provide a unique opportunity to study genetic imprinting. This process involves the labeling of genes by mothers and fathers before passing them on to their offspring, leading to conflicts between maternal and paternal genes.
The study reveals significant differences in human and chimpanzee brain gene and protein expression, with humans accumulating expression differences at least five times faster than chimpanzees. This discovery may provide insights into the genetics underlying diseases that affect humans but not chimps.
Researchers discover immune proteins that viruses once exploited have evolved to call in attacks against their former exploiters. This finding suggests that the immune system may be turning the tables on pathogens, and could lead to new strategies for fighting viral infections.
A recent study confirms that mutations are mainly caused by random errors in cell divisions, contradicting earlier estimates. The study found a low male-female mutation rate, especially in closely related species, but a high alpha in distantly related species, supporting the dominant role of males in driving evolution.
Researchers tracked extinct brown bears using stable isotope data, finding a separate population in Eurasia. The study suggests that competition between brown and short-faced bears was not the primary factor in their extinction.
Researchers create model that accurately reproduces natural evolution and predicts how bacteria will become resistant to antibiotics. The model shows promise as a possible tool for creating new drugs that can evade bacterial adaptation.
Templeton's analysis reveals human population expansions occurred between 420,000 and 840,000 years ago and 80,000 to 150,000 years ago. Genetic interchange between populations has occurred throughout history, contradicting the idea of replacement events.
Researchers found that about 25% of genes in fruit flies are evolving rapidly in response to competitive pressures, contradicting the neutral theory. In humans, around 35% of accumulated changes are 'good,' contributing to disease resistance and sexual reproduction, highlighting the ongoing role of natural selection.
Biodiversity hotspots, home to 55% of world's primates and 22% of carnivores, are facing extinction, threatening 343 million years of evolutionary history. Preserving these ecosystems is crucial to maintaining genetic diversity and the survival of species.
Researchers reveal how mutations in Hox genes allowed aquatic crustaceans to evolve into six-legged insects, answering a key criticism of evolution. The discovery sheds light on the genetic mechanisms behind macroevolutionary change.
Researchers at Stanford Medicine developed a system to study genetics and evolution in natural populations using the three-spine stickleback fish. They found parallels between laboratory genetics and evolutionary changes in the fish, suggesting that evolution can occur through large-effect gene changes.
Researchers at HHMI used the threespine stickleback as a model to study genetic changes that define a species. They discovered that different chromosome regions control the development of different parts of the fish skeleton and found correlations between spine lengths and genetic variation.
Researchers have discovered a key cell communication gene in modern choanoflagellates, revealing that the genetic tools needed for multicellular animals were already present in single-celled microbes. This finding supports the idea that genes came before their exploitation by organisms.
Researchers suggest that South American caviomorph rodents colonized by African ancestors via oceanic currents, challenging paleontological ideas. Genetic analysis reveals a shared ancestry between African and South American rodent groups, diverging around 45 million years ago.
The newly detailed structure of PRD1 reveals striking similarities with human adenoviruses, suggesting a conserved icosahedral shape used by viruses across species. This knowledge may inform the development of novel antibiotic strategies against antibiotic-resistant bacteria.
Researchers found that humans possess two activated copies of the IGF2R gene, which helps prevent fetal overgrowth and cancer susceptibility. This genetic difference may make human cloning less complicated than other animals.
Research suggests centromeric DNA and histones evolve rapidly, influencing species compatibility. Continuous evolution of centromeric histones may be driving adaptation to changing DNA sequences, contributing to the 'centromere paradox' and species sterility.
Scientists have discovered the genetic and molecular means by which roundworms develop resistance to Bt toxins, which are safe to humans but threaten long-term effectiveness. The researchers identified a galactosyltransferase enzyme as key to toxin recognition, enabling the development of strategies to delay or circumvent resistance.
Researchers at Duke University used nuclear genes to analyze genetic material from 15 mammal species, providing statistically unambiguous results in favor of the Theria hypothesis. This contradicts the Marsupionta hypothesis supported by mitochondrial DNA method, which links disparate animals like kangaroos and whales.
A study by Jonathan B. Losos and Dolph Schluter found that the diversity of lizard species on larger Caribbean islands is primarily due to evolutionary processes, rather than colonization and extinction. The researchers used the Caribbean lizard phylogeny to estimate the number of immigration and speciation events on the islands.
Researchers at University of Wisconsin-Madison identify gene called bric-a-brac that establishes sex differences in body pigmentation, with males under pressure to evolve new traits to stay competitive. The discovery provides a window into ongoing evolutionary processes and sheds light on the genetic basis of sex differences.
Researchers found that young birds can recognize and prefer learning the songs of their own subspecies over other types. The study also revealed that birds have a more finely detailed sense of song than previously thought. After tutoring, two-thirds of the birds chose to sing their own subspecies' song.
Researchers use 18th-century formula to reconcile DNA study discrepancies and create more consistent picture of evolution's history. By considering all possible evolutionary trees, Bayesian mathematics allows for a more accurate understanding of the evolutionary history of life.
Researchers identified distinct regions in the DNA where random genetic changes are more likely to benefit or harm an organism, suggesting a potential way to analyze genetic information from humans and other species. The study's findings could aid in understanding how life developed various proteins.
HHMI researchers found that yeast prions can transmit phenotypes through protein-protein interactions, hinting at the presence of undiscovered protein-based 'genetic elements'. This discovery offers a powerful new technique for exploring cells' machinery by selectively turning off specific proteins.
Researchers found that genes involved in male reproductive processes, such as sperm production and morphology, have evolved at a faster rate than non-sexual genes in humans. This accelerated evolution is attributed to sexual pressure, including competition for mating success and internal sperm competition.
Researchers discovered that humans carry a snippet of DNA resembling an HIV gene sequence, known as HERV-K, which has been present in the human genome for over 30 million years. The virus's Rev protein, similar to HIV's, helps with viral replication and may have implications for xenografts and viral infection strategies.
Researchers have found that the ancestor of human sex chromosomes arose from an identical pair of standard chromosomes approximately 240-320 million years ago. This new evidence suggests that the first events creating sex chromosomes occurred earlier than previously thought, around 100 million years sooner.
The X and Y chromosomes are thought to have originated from a pair of identical autosomes, diverging over 300 million years through four discrete stages. This divergence led to the formation of distinct sex chromosomes, with X-Y genes serving as fossils for reconstructing their evolutionary history.
Researchers reconstructed the stages of sex chromosome evolution, tracing the modern X and Y chromosomes back to ordinary autosomes. The study found that these chromosomes differentiated into distinct blocks, with genes clustered together on one chromosome but scattered across the other.
Researchers discover that mobile DNA sequences, known as transposons, generate chromosomal inversions in the Drosophila fly. These inversions are found in small independent DNA sequences and have a positive role in evolution.
The University of Chicago's symposium on evolutionary developmental biology will explore new perspectives on animal evolution. Keynote speakers and organizers aim to challenge traditional views on the complexity of ancient organisms that gave rise to diverse phyla.
Researchers study hybrid species' genetic makeup and impact on ecosystems, challenging existing paradigms. Some studies find hybrids to be more fit than their parents in certain environments, while others reveal increased susceptibility to parasites.
A study at the University of Pennsylvania Medical Center found that certain retrotransposons can pick up flanking genetic sequences and insert themselves along with tag-along DNA, creating novel genetic combinations. This mechanism may contribute to evolutionary change in humans and other mammals by generating genomic diversity.
Scientists from the University of Wisconsin-Madison describe a genetic trick that helps explain the diversity of patterning and color on butterfly wings. This trick is also believed to be used among animals, enabling the emergence of new morphological characteristics through evolution.
Researchers at the University of Chicago have discovered a gene that causes male progeny of two recently separated species to be sterile, hinting at an early indicator of speciation. The homeobox gene is evolving rapidly due to its role in controlling male sexual function, leading to sibling species incompatibility.
Researchers successfully revived bacteria extracted from ancient bees preserved in amber, opening up new possibilities for pharmaceuticals and industrial applications. Ancient plant specimens are also being studied to understand genetic evolution and identify potential biocontrol uses.
A recent DNA study by Alan R. Templeton reveals that the genetic variation among humans is primarily individual-level, with most differences too small to define distinct racial lines. The research challenges the notion of human races as a scientifically valid concept.
The sensory exploitation theory suggests that animals choose mates using sensory systems shaped for daily survival needs, rather than solely for sexual attraction. This model proposes that animals have built-in preferences for traits unrelated to genetic fitness, which can be seen in examples such as water mites mimicking copepod vibra...
Evolutionary biologist H. Allen Orr proposes a new theory on the genetic foundations of adaptation, challenging standard theory that only tiny genetic changes contribute to adaptation. Orr's work uses mathematical modeling and computer simulations, suggesting that a mix of minor and major genetic changes can lead to adaptation.
A new hypothesis proposes that a 71,000-year-old volcanic winter and subsequent 1,000-year ice age led to widespread famine and death, causing a significant bottleneck in human populations. This event is believed to have resulted in rapid genetic divergence among modern humans.
Researchers find that the Jamaican tree crab and its relatives are not related to ocean-dwelling crabs but evolved from a common Jamaican marine ancestor. The species made a rapid evolutionary leap, adapting to their new environment in just 4 million years.
A massive gene study suggests that mammals first evolved around 100 million years ago during the Cretaceous era, much earlier than previously estimated. The research used genetic data from over 10,000 species to infer origin dates, contradicting fossil-based estimates that linked mammal evolution to mass extinctions.
Anthropologists Milford Wolpoff and Rachel Caspari propose a multi-regional theory of human evolution, suggesting that populations evolved concurrently in various regions over two million years. This perspective has significant social and political implications, as it challenges the concept of a single common ancestor.