Articles tagged with Evolutionary Genetics
Researchers found that tumour samples from over 2,600 patients with different types of cancer contain a high prevalence of genetic diversity within individual tumours. This variation is a challenge for doctors as treatment may not be effective against another subclone, and certain subclones can initiate tumour spread or drug resistance.
The Pyrenean Ibex's decline was driven by a combination of hunting and infectious diseases, which further reduced its already low genetic diversity. The species' eventual extinction highlights the importance of historical biological collections for genetic analyses of extinct species.
A team of scientists from UNIGE has identified a crucial role for a micro-peptide in determining the sperm that will fertilize an egg in Drosophila females. The peptide plays a key part in the competition between spermatozoa from different males, and its absence leads to reduced fertility in subsequent matings.
Researchers found that spatial constraints from the surrounding environment significantly affect tumor evolution, leading to diverse mutational patterns among patients. The study highlights the importance of tissue architecture in regulating tumor growth and behavior.
A Rutgers University-led study finds that overfishing is unlikely to be the primary cause of genetic changes in Atlantic cod. Instead, researchers suggest that addressing environmental factors such as climate change and reducing fishing pressure may be more effective in allowing cod populations to recover.
A large-scale study has identified a new genetic link to male infertility, revealing that unstable Y chromosomes are associated with a significantly increased risk of fertility issues. The study analyzed over 2,300 Estonian men and found that the genetic variation was more common in European descent populations.
A University of Colorado Boulder-led research team found the Iberá Seedeater, an endangered songbird, used genetic shuffling instead of new mutations for speciation. The bird's unique behavior keeps it apart from closely related species.
Researchers found genetically distinct Fal Estuary maerl beds, shaped by geographical isolation and limited connectivity. Threats from shipping and climate change require targeted conservation efforts to protect these ancient ecosystems.
Researchers identified a long-overlooked pattern in stomatal development, which suggests that living conditions regulate stomatal formation. The discovery uses the plant genus Callitriche, including both aquatic and terrestrial species, to reveal a coordinated delay in stomatal formation for aquatic species.
A team of biologists found that human pelvis sex differences are similar to those in chimpanzees, suggesting an ancient origin. The magnitude of these differences is only half as large in chimpanzees, indicating that modern humans inherited this pattern from earlier mammals.
A new study finds that female choice regarding mate traits drives the emergence of new species in Iberá Seedeater songbirds. The study reveals pre-mating isolation as a powerful force in maintaining reproductive barriers between co-occurring species, leading to rapid speciation.
Scientists have isolated a genetic clue in the form of an RNA polymerase enzyme that offers new insights into the origins of life. The discovery provides evidence for the RNA World Hypothesis, suggesting that self-replicating RNA molecules were capable of driving chemical reactions essential for life.
Research on E. coli bacteria reveals that higher translation error rates lead to increased phenotypic variability at the single-cell level, affecting cell length and division time. However, population-level growth parameters show inconsistent correlations with mistranslation levels, highlighting the need for further investigation.
Researchers at Stanford University developed a new technique to compare genetic differences between humans and chimpanzees, revealing significant disparities in the expression of genes SSTR2 and EVC2. This study provides insight into human evolution and potential causes of neuropsychiatric diseases.
Researchers from the University of Copenhagen have studied the giraffe's genome, discovering a key gene FGFRL1 that enables its extraordinary features, such as high blood pressure and dense bones. The study also found that giraffes spend less time sleeping than other mammals due to their unique circadian rhythm regulation.
The study confirms that the placenta is a 'dumping ground' for genetic defects, harboring mutations similar to childhood cancers. It tolerates major genetic flaws, unlike other human organs.
Researchers are using Drosophila melanogaster fruit flies to explore genetic underpinnings of susceptibility to environmental toxicants and develop precision toxicology. The study aims to identify molecular key event biomarkers in non-mammalian models that predict adverse health outcomes.
A recent study found that chimpanzees have been reconnected for extended periods during the most recent maximal expansion of African forests, contrary to previous assumptions. The team's comprehensive sampling and use of rapidly-evolving genetic markers revealed genetic connectivity mirrors geographic distance and local factors.
A team of researchers used a machine-learning approach to map the genetic and environmental connectivity of Aedes aegypti mosquitoes, a primary vector for diseases such as dengue fever and Zika. The study provides insights into the mosquito's adaptability to new landscapes and expanding range.
A study found that transposons play a key role in creating new genes through exon shuffling, a process that can lead to the creation of novel transcription factors. The research identified over 100 distinct genes fused with transposases across various species, including humans.
Paramecium uses a complex system to determine mating types, allowing for genetic variation and reproduction. The mechanism involves programmed genome rearrangements and small RNAs that eliminate unnecessary DNA sequences.
Research sequenced 65 tiger genomes revealing strong genetic differences between subspecies, which emerged recently due to climatic shift and human dominance. Conservation genomics can inform management strategies, highlighting the need for genetic rescue through hybridization or selection of adapted traits.
Researchers sequenced DNA from mammoth remains up to 1.2 million years old, revealing a previously unknown genetic lineage and showing that Columbian mammoths were hybrids of woolly and Adycha mammoths. The study provides new insights into how fast mammoths adapted to cold climates.
Researchers found a group of genes on chromosome 12 that reduces the risk of developing severe COVID-19 by around 20%, inherited from Neanderthals. These genes code for enzymes that help destroy viral genomes, and the Neanderthal variant is more efficient, providing protection against severe COVID-19.
A recent study led by McGill University found that the Pacific and Caribbean crocodile populations have been separated for approximately 100,000 years, contradicting previous expectations of 3 million years. This discovery was made possible by reconstructing Ice Age sea levels and analyzing genetic variations in the crocodiles' genomes.
A new study has sequenced the capuchin monkey genome, uncovering genetic clues about their long lifespan and large brains. The researchers identified genes associated with DNA damage response, metabolism, and insulin signalling, which may contribute to their longevity.
A new study found that male fruit flies with the most impressive sexual ornamentation also have super sperm that can outcompete rivals in the post-mating fertilization game. The researchers discovered a strong link between the males' competitive success at passing on their genes even after a female fly has mated with other flies.
Experts review current understanding of modern human ancestry tracing back to the distant past, identifying three key phases in human evolution. The study suggests that no specific point in time can be identified when modern human ancestry was confined to a limited birthplace.
Researchers at Oregon State University used thousands of genetic markers to determine the Pacific albacore's population structure. The study found that fish from different hemispheres intermingle and sometimes breed with each other, revealing a lack of clear boundaries between North and South Pacific populations.
A new study reveals that European Starlings in North America underwent rapid local adaptation, adjusting to temperature and rainfall variations through subtle genetic changes. The species' massive population size enabled the spread of beneficial gene variants across generations.
A group of caterpillars that eat cycad plants have evolved a toxic defense mechanism, resulting in bold colors and behaviors to deter predators. The study reveals the genetic consequences of this adaptation, including rapid evolutionary change and the development of proteins that destroy cells and remove dead cell debris.
A UCL-led team discovered 32 gene regions affecting facial features such as nose and lip shapes. The analysis of over 6,000 volunteers found that one gene, TBX15, was inherited from the Denisovans, an extinct group of ancient humans.
Harvard scientists engineered zebrafish with limb-like appendages through a single genetic mutation, revealing the beginning formation of limb structures and their potential to evolve from fins. The discovery sheds light on vertebrate evolution, fin-to-limb transition, and the complex structures that enable land movement.
Researchers at Harvard University discovered that zebrafish fins can be transformed into complex limb-like structures through genetic mutations. The study reveals that the ability to form limb-like structures was present in the common ancestor of tetrapods and teleost fishes.
A recent genome mapping study by the University of Copenhagen found that our common fish ancestor, which lived 50 million years ago, already carried genetic codes for limb-like forms and air breathing. This discovery challenges the long-held belief that limbs and lungs evolved separately during the vertebrate transition from water to l...
A new study reveals that retrogenes, which are inserted into the genome via reverse transcription of mRNA molecules, can have a profound impact on genetic diversity. These retrogenes can act as regulatory mutations, negatively influencing the original gene's mRNA and causing harm to organisms.
A study published in eLife reveals that humans living in Cabo Verde adapted to malaria over just 500 years, with a genetic mutation spreading rapidly through the population. This finding provides evidence of recent genetic adaptation and highlights the impact of human migration on disease resistance.
Research identifies three key properties that lead to gene survival on snake sex-specific chromosomes: dosage sensitivity, broad tissue expression, and strong purifying selection. These genes play critical roles in developmental processes and are also linked to human birth defects.
A team led by University of South Florida biologist Mark Margres has sequenced the genome of the Tiger Rattlesnake to understand its deadly venom. The research reveals a complex process behind the venom's toxicity, with only 15 genes actively producing toxic proteins.
Researchers used computer simulations to study evolution and phenotypic switching in organisms, finding that a 'hidden' switch mechanism is used for stability, and can be activated in response to environmental changes. The study suggests that this mechanism helps organisms maintain gene expression levels under stable conditions.
Researchers at University of Exeter found that male Drosophila simulans flies with certain genital shapes produced more offspring. Surprisingly, despite rapid evolution of genital form, selection on this trait was relatively weak.
Researchers sequenced ancient DNA from dire wolf sub-fossils, showing they diverged from grey wolves over 5 million years ago. Dire wolves remained isolated in North America for millions of years, becoming genetically distinct from other canids.
Researchers have shown that new ecological variants can evolve within thoroughly mixed yeast populations, diverging into distinct phenotypes and genetic classes. The emergence of these differences is attributed to newly acquired mutations in 50:50 mixtures, rather than the selection of existing variants.
Researchers have identified a unique genetic 'mimicry switch' that determines whether male and female Elymnias hypermnestra palmflies mimic the same or different species. The study found that sexual dimorphism arose repeatedly in different populations, linked to a gene associated with melanin localization and regulation.
A team of scientists found that the dire wolf evolved in isolation from gray wolves and coyotes, with no evidence of interbreeding or gene flow between the two species. This discovery sheds light on the dire wolf's origins and evolution, revealing a unique genetic history.
Researchers identify DNA-RNA hybrids as a key factor in ALS progression, leading to increased genomic damage and genetic instability. This breakthrough opens new avenues for understanding the disease's molecular basis and developing therapies to slow its evolution.
A new technique using environmental DNA analysis reveals nuanced information about invasive round goby fish populations, allowing for population estimates and origin prediction. The method has the potential to overcome logistical challenges in studying elusive species, improving conservation outcomes.
A new study combining archaeological work with genetic technology sheds light on the peopling of the Caribbean. The analysis of 263 ancient human genomes shows two major migratory waves in the region, revealing a highly mobile population with distant relatives often living on different islands.
Researchers found that present-day Mariana Islanders' ancestry is linked to the Philippines, suggesting an Island Southeast Asia origin for the first settlers. The study also suggests a close link between Guam skeletons and early Lapita individuals from Vanuatu and Tonga.
A recent study in Nature Communications found evidence of recombination and genetic exchange in bdelloid rotifers, which were previously thought to be asexual. The discovery suggests that these organisms may not be as evolutionarily dead-end as once believed.
Researchers from the University of Würzburg have discovered that certain genes are responsible for the development of male ornaments, including the iconic swordtail fin. These genes play a crucial role in sexual selection and may have evolved to enhance mating success.
Dr. Owen Gilbert introduces a novel concept in evolutionary theory, suggesting that natural reward acts synergistically with natural selection to drive the innovativeness of life over time. This framework offers new perspectives on long-standing biological mysteries and has been justified by existing data.
Scientists have discovered 17 genetic abnormalities that cause brain aneurysms, providing a new understanding of the disease and potential markers for instability. The study also highlights the importance of genetic predisposition to high blood pressure and smoking in developing intracranial aneurysms.
Researchers analyzed Neandertal-associated phenotypes in Asian and European populations, finding shared variants increasing risk of autoimmune diseases like dermatitis and rheumatoid arthritis. In contrast, a specific gene variant in Asians had a protective effect against prostate cancer.
A new statistical physics method reveals patterns of selection in HIV evolution, distinguishing adaptive mutations from random variations. This approach could inform HIV vaccine design and develop better treatments against the virus.
Two genes involved in plumage coloration have evolved through distinct processes: ASIP, which produces melanin, and BCO2, which produces carotenoid pigments. The researchers found evidence of introgression, where genes from one species were transferred to another, contributing to the warblers' diverse colors.
Researchers have developed a new method to identify adaptive mutations in complex evolving populations, shedding light on how HIV mutates to escape the immune system. The approach enables the analysis of selection in complex evolutionary systems, which could inform HIV vaccine design and treatment strategies.
A recent study by researchers at UC Riverside suggests that olfaction may play an important role in motivating mammals to engage in voluntary exercise. The study found genetic differences in the olfactory system between high-runner mice and control lines, which made them perceive smells differently.
A study found that topography, rather than vegetation, is the main factor leading to genetic diversity of Bokermannohyla ibitiguara, a tree frog endemic to the Serra da Canastra mountain range. The flatter terrain allows for greater dispersal and increased genetic diversity.
Researchers at the Stowers Institute for Medical Research identified tiny variations in an amino acid sequence critical to retaining ancestral gene function. The study found that small differences can lead to significant evolutionary changes and highlights the importance of studying protein sequences.