Articles tagged with Evolutionary Genetics
A recent study on chimpanzee genetics reveals three distinct groups with considerable genetic variation, which has important implications for conservation efforts. The research team found that the traditional geography-based sorting of chimps into western, central, and eastern populations is supported by significant genetic differences.
The completed Rhesus macaque DNA sequence has advanced understanding of primate evolution and will enhance medical research in various fields. The analysis revealed examples of duplicated segments, expanded gene families, and individual genes influenced by natural selection.
A new study has found that the ancestors of modern mammals did not quickly evolve and spread to fill empty niches following the mass extinctions of dinosaurs. Instead, diversification rates dropped and stayed low for 40 million years, with modern mammal orders emerging around 50-55 million years ago.
A new study published in PLoS Genetics used computer simulations to trace genetic changes over thousands of generations in a simulated population, testing the effectiveness of statistical genetic methods in identifying multiple genes causing complex diseases. The researchers found that known methods are limited and identified which met...
Researchers successfully engineered mice to see colors beyond the normal range by introducing a single human gene that codes for a light sensor. This breakthrough demonstrates the flexibility of the mammalian brain in processing sensory information, opening new avenues for understanding the evolution of color vision.
Researchers found that asexual bdelloid rotifers have evolved independently into distinct entities, with genetic and morphological cohesion within populations and divergence between them. This suggests that factors other than interbreeding control species cohesion and divergence in these organisms.
A genetic analysis of vespid wasps reveals that eusociality evolved separately in two groups, contradicting a long-held model. The study adds weight to earlier findings and sheds light on the complexity of evolutionary processes.
A UCSB study found evidence of a nonconscious mechanism in the human brain that identifies genetic siblings based on cues guided by hunter-gatherer ancestors. This mechanism regulates feelings of altruism and aversion to incestuous relations, suggesting natural selection played a role in its evolution.
Studies on Mexican cavefish reveal distinct evolutionary pathways for eyes and pigmentation. Evolution by natural selection drives eye regression due to metabolic costs, while genetic drift influences pigment cell density variations.
A new statistical method helps choose animals that are more congenial in groups, improving productivity and animal well-being. The tool aids in predicting how social interactions impact the natural evolution of species, with potential applications for securing the world's food supply.
A new study suggests that human males have evolved mechanisms to outcompete rivals for fertilization, even after sex. This phenomenon, dubbed 'sperm competition,' can lead to increased sperm count and more aggressive sexual behavior in response to perceived infidelity.
A new model proposes that sexual differentiation may exact a high biological cost, reducing function of mitochondria and influencing longevity. The model predicts which genes regulate life span and suggests testable hypotheses for exploring the biggest question in aging research.
Researchers found that splice-enhancer domains, which code for specific amino acids, influence protein evolution and are subject to selective pressure. Smaller exons near intron-exon boundaries also evolve more slowly.
Recent studies on animal migration have gained insights into the evolution of this complex phenomenon, yet much remains unknown. Advances in technology are helping scientists better understand the mechanisms behind migration, including the role of genetic correlations in determining future evolutionary changes.
Researchers at the University of Southern California have identified approximately 350 genes influencing oyster growth rate, revealing new insights into hybrid vigor. This discovery has implications for efficient and sustainable domestication of oysters and other ocean species.
New research by Rice University scientists reveals that horizontal gene transfer (HGT) contributes to the speed of evolution, allowing life forms to adapt faster. The study proposes a mathematical model that accounts for HGT and its impact on the dynamics of evolution.
Marine scientists discovered that baby fish can find their way back to their home coral reef by using their sense of smell, braving strong currents and predators. This unique ability has major implications for how reefs are managed and drives evolution on the Reef.
A 36,000-year-old human skull from South Africa confirms the 'Out of Africa' theory of modern human origins. The fossil provides critical evidence that modern humans migrated out of sub-Saharan Africa around this time.
Despite rapid brain growth, human brain genes have slowed down evolution since the split from chimpanzees. Complexity and gene-gene interactions place constraints on brain genes, hindering change. Genes in humans evolve more slowly than in other primates or mice.
UCSF scientists have identified a cell population, known as von Economo neurons, that is selectively targeted by frontotemporal dementia. This discovery provides new insight into the early degenerative process of the disease and may lead to new strategies for treatment.
A study at UNC Chapel Hill found that specific genetic variants of the COMT gene can affect pain processing by altering messenger RNA secondary structure. The discovery may lead to more effective treatments for TMJD and other chronic pain conditions.
Russian mathematician Grigori Perelman solved the Poincaré Conjecture in 2006, a problem proposed by Henri Poincaré in 1904. His proof was completed by three separate teams and led to him being awarded the Fields Medal.
A plant evolutionary biologist is conducting genetic studies on red rice to understand molecular differences with cultivated rice, which could lead to eradication of the weed. Researchers are testing hypotheses that red rice may have originated from feral or hybridized wild species, and will use this knowledge to develop control methods.
Researchers identified a male-specific gene, PlestMID, in an oogamous green algae species that evolved from its isogamous ancestor's dominant sex. This breakthrough provides insights into the evolution of male-female dichotomy and the origin of distinct sperm and egg cells.
A massive effort to sequence and compare complete or partial genomes of Plasmodium falciparum has revealed nearly 47,000 genetic variations. This data will help researchers understand the parasite's evolution and study malarial drug resistance. New antigens identified may be potential targets for new therapeutics or vaccines.
Researchers at Cornell University discovered a mutant mouse with increased genomic instability, leading to mammary tumors. The study suggests that impaired DNA replication genes may contribute to breast cancer.
Two studies on bee evolution support a new hypothesis that bees originated in Africa over 100 million years ago. The discovery of an ancient bee fossil in amber provides strong evidence for this theory.
Researchers discovered a new gene in the gulf pipefish that codes for an astacin protein, previously associated with kidney and liver function. This protein may have evolved to support male pregnancy in this species, a mystery in evolutionary biology.
A recent study published in BMC Evolutionary Biology found that lemurs with strikingly different coat colors are genetically related and belong to the same species. The research analyzed mitochondrial genes from 70 mouse lemurs, showing they all belong to Microcebus griseorufus, regardless of their geographical location.
Researchers analyzed mitochondrial genes of 70 lemurs suspected of being different species due to striking coat colors, finding they belonged to the same Microcebus griseorufus species. Genetic analysis revealed no significant differences among them, suggesting that morphological variations may not necessarily indicate distinct species.
Researchers sequenced the purple sea urchin genome, detecting an unusually large number of innate immunity genes and early components of adaptive immune system. The findings suggest that complex genetic regulatory circuits were assembled in a late evolutionary event.
Researchers have produced the first molecular 'dictionary' of social amoeba species, revealing a major trend in the evolution of increased cell specialization and organism size. The study provides a powerful tool to examine molecular mechanisms driving evolution and development.
A genetic study by Dr. Marie Kmita and her colleagues reveals how Hox genes control limb formation and generate asymmetry in arms and legs. The sequential activation of these genes sets up the architecture of limbs, triggering the activation of a 'polarizing' gene called Sonic Hedgehog.
Researchers found that some viruses, like the human polyomavirus JCV, may be evolving at higher rates than previously assumed. The virus is traditionally used as a genetic marker for human migration and evolution, but its reliability has been called into question by this new study.
In a study published in PNAS, researchers found that female pronghorns prioritize male vigor over ornamentation when choosing a mate. This leads to the survival advantage of offspring sired by these vigorous males, as they exhibit faster growth rates and increased survival up to five years.
Research on Glanville fritillary butterflies found that females with enhanced flight capabilities reproduce more quickly and establish new populations. The study suggests that genetic differences influence behavior, and the environment favors individuals with certain traits.
An interdisciplinary team will investigate how environmental changes influence an organism's evolution and how the evolving organism affects the ecosystem. The study, led by UC Riverside's David Reznick, aims to understand eco-evolutionary feedback loops in guppy populations coexisting with Hart's killifish.
Researchers discovered that the cell cycle's temporal regulation evolves rapidly, with changes occurring every 100 million years. This fast evolution is unexpected for a fundamental process like cell division.
A study in Heliconius butterflies reveals that a single 'supergene' controls the variation of their wing patterns. The researchers found that this supergene region, responsible for producing diversity in color patterns, is conserved across three species.
A recent study published in Journal of Vision found that judging facial similarity in children can accurately estimate the probability that two children are close genetic relatives. Researchers used participants' ratings to transform into estimates of genetic relatedness.
Research reveals that a specific receptor gene's variation affects perception of bitter compounds in plants, such as glucosinolates found in broccoli. This study supports the idea that evolution shaped human taste preferences to avoid thyroid-inhibiting compounds.
A study by Purdue University researchers has identified unusual genetic traits in voles that challenge current scientific understanding. The vole's unique genetic makeup, including its ability to insert DNA into the nucleus, could have important implications for human genetics and gene therapy.
Biologists have discovered that genes can change their locations in a genome, triggering the origin of species. The 'jumping gene' theory, long disputed, has been confirmed by researchers at the University of Rochester using fruit fly species Drosophila melanogaster and Drosophila simulans.
A study of Old World fruit flies found increased frequency of low-latitude inversions in their chromosomes, suggesting protection against warmer temperatures. This rapid genetic shift is detectable even for samples separated by fewer than two decades, highlighting the potential for species adaptation to climate change.
Researchers report first case of total suppression of male killing in a butterfly, revealing genetic conflict between elements promoting life and death. Breeding experiments show that counteracting elements can spread quickly through the population, potentially leading to widespread disappearance of male-killing bacteria.
New research reveals that the UCP1 gene was inactivated 20 million years ago in pigs, causing them to lose the ability to use brown fat for body heat. As a result, piglets shudder to maintain their body temperature.
A survey found that one-third of Americans reject evolution, a higher figure than in European countries. Fundamentalist religions and politics play a significant role in this disparity.
Scientists at Children's Hospital of Pittsburgh found that a category of genes known as pseudogenes serve no function, bolstering the theory of evolution. The study contradicts previous claims made by Intelligent Design proponents and suggests that pseudogenes are evolutionary relics with no function.
Researchers found that genetic instructions for constructing and positioning human limbs originated from ancient fish ancestors around 100 million years ago. They isolated genes from the spotted catshark and discovered a shared developmental mechanism between median fin development and limb formation.
Scientists found that genetic diversity in foundation species, like the cottonwood tree, drives the structure of entire ecosystems. This knowledge has far-reaching implications for conservation efforts and understanding the impact of genetically modified organisms on landscapes.
A study by UC Riverside researchers found that the California wild radish is a hybrid of cultivated radish and jointed charlock, having completely replaced its ancestors in less than 100 years. The researchers attribute this rapid spread to unique traits such as unswollen roots and early flowering.
Researchers at LSUHSC discovered unique RNAs in centrosomes that govern cell division and genetic stability. The findings have broad implications for understanding eukaryotic evolution and potentially developing new cancer treatments.
The study found that environmental quality increases the heritability of birth weight, but selection strength weakens in better environments. This suggests that biologically realistic models are crucial for predicting evolution in wild populations.
Researchers have discovered electric fish in Africa with the same DNA but different electric signals and appearances, sparking hope that they are on the verge of forming two separate species. The findings provide a rare example of sympatric speciation, where animals from the same geographic location diverge into distinct groups.
Male guppies with rare color patterns have a highly significant survival advantage in the wild, surviving at 84% rate compared to 69% for common-patterned males. This phenomenon is linked to frequency-dependent survival, where rarity confers an advantage over common variants.
Researchers have identified the genes CO and FT responsible for tree flowering and reproduction, which could lead to faster breeding programs and strategies. This breakthrough may also help predict how trees will respond to climate change.
Scientists discover that higher temperatures near the equator speed up metabolism, fueling genetic changes and leading to speciation. This finding helps explain why more living species exist near the equator.
Researchers found that gene expression levels become more variable with age in both humans and rats, supporting the notion of stochastic aging. The observed increases in expression variation are surprisingly small, leaving room for further explanations regarding the relationship between aging-related changes and molecular mechanisms.
Scientists used fossil and developmental data to pinpoint the genetic changes that led to whales losing their hind limbs. The gradual shrinkage of hind limbs was caused by slowly accumulated genetic changes, while the actual loss occurred when a drastic change inactivated the Sonic hedgehog gene.
Researchers found that ancient whales' hind limbs regressed over millions of years via small genetic changes, not a single dramatic event. This discovery highlights the complex process of evolution and developmental biology.