Research on how genomes change over time. Covers hidden DNA structure, chromosome bursts in cancer, plant pangenomes, and microbial adaptation.
A new mathematical model suggests that more genome comparisons are necessary to detect conserved DNA regions, especially for longer stretches. The model estimates that around 50-120 genomes are needed to reduce error rates from 1 in 100 to 1 in 10,000.
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 evidence for meiosis in Giardia, a single-celled protist thought to be a modern representative of an early diverging eukaryotic lineage. The discovery suggests that the earliest eukaryotes diverged after the advent of meiosis, providing new insights into sexual evolution.
The study found nearly no conservation in human and chimpanzee gene-regulating elements, indicating hominids are subject to high mutation accumulation. Population size is believed to exert a powerful influence on molecular evolution, with natural selection likely to develop stronger against unwanted mutations.
Alan Hall's work on Rho and Rac GTPases is crucial for understanding how epithelial tumour cells become metastatic. Svante Pääbo receives the Louis-Jeantet Prize for medicine to study genes involved in human evolution, including FOXP2 related to speech development.
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.
The chicken genome sequence has revealed significant insights into the evolutionary history of mammals and birds. The study found that about 60% of protein-coding genes in chickens have counterparts in humans, highlighting the shared genetic mechanisms underlying various biological processes.
The newly published chicken genomic sequence provides significant information on vertebrate evolution, revealing a clade of at least 9,600 avian species. The analysis also sheds light on the unusual genomic organization of chickens, including large variability in chromosome size and germline mutations.
Researchers from UC San Diego analyzed changes in gene orders on chromosomes and compared rearrangements in the chicken genome to those in the human, mouse, and rat genomes. The study found that chickens are closer to humans than previously thought when it comes to genomic architecture.
Gene deserts, once thought to be 'junk DNA,' play a crucial role in regulating gene activity. Researchers discovered stable desert regions with non-coding regulatory elements and variable regions with limited functionality.
The chicken genome contains approximately 20,000-23,000 genes, less than the human genome's 20,000-25,000 genes. Researchers found that about 60% of chicken genes correspond to similar human genes.
The sequencing of the chicken genome has provided valuable insights into human genetics, with similarities found between the two genomes that can help understand the function of human genes. The availability of the chicken genome will aid in the breeding of healthier chickens and the design of better veterinary vaccines.
The completed chicken genome provides invaluable information for studying the human genome due to its ideal evolutionary distance. Strong conservation in previously thought 'junk' DNA regions has been found, shedding light on their importance.
Researchers successfully reconstructed parts of the genome of a common mammalian ancestor using computerized paleogenomics, achieving an accuracy rate of 98%. This achievement provides a valuable window into the evolution of DNA in placental mammals.
Researchers developed a method to reconstruct ancestral genome sequences by comparing them with modern species' genomes, revealing new insights into mammalian evolution and biology. The technique achieved an accuracy of over 98% in reconstructing the ancestral sequence.
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.
The genomic sequence of the coelacanth, a 'living fossil,' holds valuable clues for biologists studying vertebrate evolution. The completed genome analysis reveals slow evolutionary changes relative to land vertebrates and teleost fishes, making it a better reference for comparative sequence analyses.
Researchers discovered Cf-4 and Cf-9 resistance genes in wild tomato species, likely retained against the fungus C. fulvum.
Scientists have found a trackway of fossil genes in the Japanese yeast Saccharomyces kudriavzevii, showing how an organism discards traits when they are no longer needed. The discovery provides insights into the process of evolution and how genetic pathways become obsolete.
A study of 2,400 British middle-aged men found that the positive selection for a gene variant in the MMP3 gene resulted in a 43% lower incidence of coronary artery heart disease. The researchers suggest that this variation is not just harmless mutation, but rather a process contributing to population health.
The study uses nearly 1000 SNPs to define the genetic and evolutionary types of several anthrax isolates, providing a critical step toward future detection of this potential public threat. The results also establish a model for other biothreat pathogens and common public health-related diseases.
Researchers developed a new analytical approach to understand naturally occurring mutations, revealing patterns that distinguish between mutational mechanisms. By analyzing genome sequences from 19 mammalian species, they identified regular clock-like fashion of CpG mutations and shed light on factors influencing evolution.
A study reveals that the APOBEC3G gene, which edits DNA and RNA to prevent viral replication, has been under strong positive selection for 33 million years. This ancient defense mechanism may have evolved to counter human endogenous retroviruses before HIV existed.
A team of researchers from Universitat Autonoma de Barcelona has discovered a new genetic mechanism for evolution involving transposons and antisense RNA. Transposons can silence genes by inducing antisense RNA, leading to favorable changes in adaptation and survival.
A recent study published in PLOS Biology compared the genomes of humans, chimpanzees, bonobos, gorillas, and orangutans to identify variations in gene copy numbers. The researchers found over 1,000 genes with changes in copy number, with humans showing the highest number of increased copy numbers, particularly in brain-related genes.
Researchers at Johns Hopkins Medicine have created an artificial jumping gene that can randomly silence genes in mice, offering a new way to study genetic function and evolution. The discovery has the potential to reveal how genes interact with each other and contribute to human health and disease.
Researchers have identified critical stretches of ultra-conserved DNA sequences in the human genome, found near well-studied genes and involved in regulating transcription. These elements were also conserved across multiple species, including rats, mice, chickens, and even ancient genomes like those of sea squirts and roundworms.
Researchers discovered 481 ultra-conserved elements in the human genome, which are long and evolutionarily frozen. These elements are associated with genes, particularly those involved in regulating gene expression through alternative splicing.
Campbell's groundbreaking research on bacteriophage lambda paved the way for studies on site-specific recombination and genome manipulation. His work has significantly advanced our understanding of microbial population dynamics and genome evolution.
Campbell's work on bacteriophage lambda demonstrated the relationship between its genome and host, leading to key findings in genetic and biochemical studies of site-specific recombination. His extensive contributions also include discovery of nonsense mutations, bacterial gene regulation, and microbial population dynamics research.
Researchers developed a novel method to pinpoint rapidly evolving genes in pathogens, revealing potential drug targets for tuberculosis and malaria. The technique analyzes genome sequences to identify genes under selective pressure, allowing for the discovery of previously unknown genes.
A Stanford study on threespine stickleback fish found that a single gene, Pitx1, is responsible for the loss of hind fins in two distinct populations. The researchers discovered that mutations in this gene can alter limb development without killing the animal.
Blank's research challenges initial findings on cyanobacteria age, pinning emergence to 2.3 billion years ago using genetic analysis. This breakthrough also sheds light on eukaryote evolution and the development of mitochondria.
Researchers from UC San Diego have generated and analyzed the rat genome, paving the way for comparisons with human and mouse genomes. The study reveals that around 40% of the modern mammalian genome derives from a common ancestor, with the rat data showing similarities to human and mouse genomes.
Researchers have completed a high-quality draft sequence of the laboratory rat genome, which will facilitate studies on cardiovascular diseases, psychiatric disorders, and cancer. The comparison of the rat genome with that of humans and mice will provide insight into biological differences and evolution.
The Rat Genome Sequencing Project Consortium has completed the genome sequence of the common laboratory brown rat, sharing approximately 825 non-repetitive DNA sequences with humans and mice. The study reveals unique genetic differences between rodents and humans, shedding light on evolutionary processes.
Scientists have identified a key gene, FoxP2, that enables vocal learning in birds, which is similar to human language production. The researchers found that the gene is expressed in areas of the brain responsible for song production and learning, and its expression levels increase during times of song learning.
Researchers have discovered profound differences in the gene content of T. denticola, an oral pathogen associated with gum disease, compared to other spirochetes that cause syphilis and Lyme disease. The study's findings highlight the power of comparative genomics in understanding how related pathogens can cause different diseases.
The study analyzed data for 10 families of protein-coding genes in multi-celled organisms, resolving a debate over the timing of intron emergence. It found that most modern introns appeared subsequent to gene creation, contradicting the 'introns-early' view.
Researchers have sequenced the complete genome of Wolbachia pipientis, a parasitic bacterium that targets male hosts, providing new insights into its biology and evolution. The discovery has potential applications in controlling insect pests and human/animal filariasis.
Scientists have confirmed that baker's yeast underwent complete genome duplication, resulting in the creation of thousands of new genes. This phenomenon allowed for rapid adaptation to new environments and evolution of new functions.
A study by James Carrington and Steve Jacobsen reveals distinct classes of small RNAs in plants with specialized functions. These include genome maintenance, regulation of specific genes, and defense mechanisms, shedding light on the evolution of RNA-mediated gene silencing.
Researchers identify four copies of a target gene on separate chromosomes, eliminating possibility of sexual reproduction. This confirms that the ancient microbe has evolved without sex for tens of millions of years.
A study led by Bruce Lahn found that the Abnormal Spindle-Like Microcephaly Associated (ASPM) gene shows strong evidence of accelerated evolutionary changes in the primate lineage leading to humans. These changes are most prominent after humans parted ways from chimpanzees, suggesting a possible key role for ASPM in human brain evolution.
Scientists have discovered that rapidly evolving genes can reveal more historical signals than slowly evolving genes, providing a new perspective on plant classification. This approach has the potential to revolutionize our understanding of plant evolution, ecology, genetics, and biodiversity.
The C. briggsae genome sequence enhances biologists' ability to mine C. elegans for biological insights, revealing new genes and functional elements. The study also highlights the rapid evolution of C. elegans and C. briggsae genomes compared to mammals.
A team of scientists from the University of Wisconsin-Madison has made a breakthrough in resolving the evolutionary tree using new genomic-scale data. By analyzing eight yeast species, they found that combining more than 100 genes provides an unprecedented level of resolution, overcoming previous limitations.
Researchers uncover two neighboring genes, Rsl1 and Rsl2, that repress male-specific liver gene expression in female mice. This discovery sheds light on the genetic basis for gender differences in liver function, revealing a complex interplay between multiple genes.
Bioinformaticians at UCSD have identified 400 'fault zones' in the human genome where gene rearrangements are more likely to occur, potentially leading to life-threatening genetic alterations. These findings challenge the long-held random breakage theory of evolution and may provide new insights into breast cancer and other diseases.
Researchers at TIGR and TCAG published the first partial shotgun-genome sequence of the dog genome, revealing similarities with human and mouse genomes. The study identified 974,400 SNPs in dogs and found that the canine lineage diverged from the common ancestor of humans, mice, and other species.
Wen-Hsiung Li has made seminal contributions to the field of evolutionary molecular genetics, developing widely used methods for inferring phylogenetic relationships and discovering important insights into genetic change rates. His work has improved our understanding of evolutionary lineages and genetic diversity.
A new approach to analyzing bacterial genomes has enabled the reconstruction of evolutionary events and the diversification of bacterial species over a billion years. This method uses gene indicators to chart the structure and substance of genomes, providing valuable insights into genomic evolution.
Researchers compared genomic regions in 13 vertebrate species, including humans and zebrafish, to identify conserved non-coding sequences with biological roles. The study provides insights into the understanding of our own genome and highlights the importance of sequencing multiple species' genomes.
A team of 71 researchers compared the human genome to 12 vertebrates, including chimpanzees, mice, and rats, to identify conserved genetic regions. These regions are likely to control important functions such as gene expression and can provide clues about how each species evolved.
Researchers found that genetic super-combinations from hybridization can create advantageous traits for survival and reproduction. They demonstrated a possible mechanism for rapid evolutionary change through replicating the births of three unusual species within a few generations.
Scientists have identified 400 'fragile regions' in the human genome that are more susceptible to genetic rearrangements, which could lead to a better understanding of cancer and other diseases. The study's findings contradict previous theories on genomic breakage, suggesting that these regions are like fault lines in the genome.
The UC Riverside-led study unveils the genome sequence of Neurospora, a model organism for understanding fungi's role in agriculture, medicine and the environment. The research reveals 10,000 predicted genes, with significant implications for developing new antibiotics and disease control strategies.
A recent study discovered a distantly similar gene called ros in puffer fish, suggesting that Agrobacterium may have originated from a marine source. The discovery was made by investigating the evolutionary origin of genes associated with bacterial virulence and found homologs of the ros gene in both marine microorganisms and sea squirts.
The genome of Ciona intestinalis, a closely related sea squirt to vertebrates, is providing clues about the origins of complex biological systems in humans. The study found similarities between Ciona and human genomes, including genes involved in immune systems and heart formation.