A new study reveals that parasites play a pivotal role in the decline of species in fragmented forests. Red colobus monkeys were found to be infected with more human or livestock parasites than their black-and-white cousins, due to their varied diet and increased travel range.
A research team at UCSC and Salk Institute has discovered a new retinal cell type called the upsilon cell, which shares similar properties with Y retinal ganglion cells. The discovery may help humans see motion and is a significant step towards understanding how primates process visual information.
A study in primates suggests that infants and children carrying a specific gene variant may be more vulnerable to the effects of fetal alcohol exposure. The research identifies a potential genetic marker for fetal alcohol spectrum disorder, which can help recognize susceptible individuals early on.
A new study by Harvard researchers found that non-human primates infer intentions based on rational action, not just surface-level appearances. The primates chose the most accessible food container in each scenario, demonstrating a human-like understanding of others' goals and actions.
Researchers found that the genes responsible for color vision in aye-ayes are fully functional, contradicting the long-held theory that nocturnal mammals lose color vision over time. The study sheds light on the evolution of color vision and highlights the importance of examining rare and endangered species.
Researchers found that rhesus macaques increase grunts and girneys when interacting with babies, suggesting a way for females to elicit attention and encourage behavior in infants. These vocalizations may also facilitate interactions between females with babies, promoting social tolerance.
New research from Duke University reveals that the way genes are used in humans differs significantly from that of chimps and other primates. The study found dramatic differences in gene regulation related to brain development and diet, which may have contributed to human adaptability and susceptibility to certain diseases.
Studies with monkeys reveal that specific parietal cortex areas process distinct aspects of 3D space, including depth structure and two-dimensional shape. These findings provide insights into the neural basis of primate visual perception and manipulation of objects.
A recent genomics study has identified genes and gene families associated with human traits such as endurance running and cognitive function. The study found that gene copy number variations in humans may have contributed to the evolution of these traits, with some genes being unique to the human lineage.
Primates use cognitive abilities to select food sources based on resource quality and social group needs. The study found that white-faced saki monkeys traveled four times further than predicted distances to choose fruit-rich sites, prioritizing the group's dominance and competition.
A 19-year study found that primate tourism practices can lead to adult aggression, disease transmission, and increased infant mortality. The study suggests that range restriction and provisioning for tourists contribute to the problem, making them an inappropriate management strategy.
Researchers found that transplanted stem cells triggered the brain's self-repair mechanisms by boosting nerve survival and blood vessel development. The study suggests that stem cells may be more effective at repairing damaged brain tissue than previously thought.
Researchers at Fred Hutchinson Cancer Center studied an ancient retrovirus, PtERV1, which infected nonhuman primates 4 million years ago. They found that humans have innate immunity to this virus, but this resistance may have made them more susceptible to HIV infection.
Researchers from Yale University and others report that injecting human neural stem cells into primates with severe Parkinson's disease improved symptoms such as tremors and motor function. The study found that the stem cells survived, migrated, and had a functional impact, suggesting a potential therapeutic value.
A Vaxfectin-formulated measles DNA vaccine has elicited protective levels of neutralizing antibodies and sterilizing immunity in juvenile and infant nonhuman primates, offering proof of concept for the technology. The vaccine showed no vaccine-related adverse events and was well-tolerated.
Scientists have successfully implanted dopamine generators in brain cells, leading to improved symptoms in Parkinson's disease in non-human primates. The treatment involves injecting fragments of the carotid body into the striate area of the brain, which boosts the production of dopaminergic cells and increases dopamine release.
Brain structures reflect sex differences due to varying pressures on males and females, with larger neocortex linked to female sociability. Greater male competition correlates with reduced septum size, suggesting less control over aggression.
The study aims to identify ways to diagnose and treat aging-related diseases earlier, using chimpanzees and rhesus macaques compared to humans with Alzheimer's disease and mild cognitive impairment. The researchers hope to develop new treatments based on specific physiological changes.
Researchers analyzed the macaque genome to identify genes that have evolved in humans compared to other primates, finding significant changes in hair and immune system genes. The study also identified genetic variations on the X chromosome, providing insights into human evolution and disease gene identification.
The draft sequence of the rhesus macaque genome will enable researchers to study disease progression at the genetic level, providing insights into human health and evolution. The findings also reveal unique aspects of the macaque's immune system response and genome organization.
Researchers at Thomas Jefferson University found that a weakened rabies virus can ferry HIV-related proteins into animals, vaccinating them against an AIDS-like disease. After two years of challenge with SIV/HIV viruses, vaccinated non-human primates showed protection from disease and high CD4 cell counts.
Researchers created mice with both human and mouse visual receptors, allowing them to distinguish between previously indistinguishable colors. This breakthrough suggests the brain can adapt to new sensory information quickly, challenging the idea that early primates developed trichromatic vision gradually over time.
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 at UGA show rats can think about their own thinking, knowing when they don't know an answer. The study opens new areas of research on animal cognition and memory, challenging previous beliefs that only primates possess metacognition.
Researchers found that rats can judge whether they have enough information to pass a test, opting out more frequently when the task is difficult. This ability broadens our understanding of cognitive skills in animals and may provide opportunities for studying metacognition's neuroanatomical mechanisms.
A new study from CAMH and NIH demonstrates that nicotine plays a critical role in reinforcing smoking behavior in primates. The study shows that animals develop strong motivation to self-administer nicotine over time.
Humans and primates are highly intelligent, social creatures prone to stress-related diseases due to chronically psychosocially stressed situations. Chronic stress compromises health by suppressing immune function, reproduction, and brain function.
Low birth numbers in early hominids combined with intense competition led to their extinction. Dr. Nina G. Jablonski reveals that environmental changes, such as shifting climate patterns, played a significant role in the demise of these ancient human ancestors.
A team of researchers from Yale University and other institutions have discovered two 56-million-year-old fossils, including the most primitive primate skeleton ever described. The study reconstructs the base of the primate family tree, providing evidence that plesiadapiforms are the most primitive primates.
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.
Scientists found that orangutans confined to resource-limited areas of Borneo had smaller brains than those living in more abundant Sumatra. The study suggests an evolutionary connection between food availability and brain size in primates.
Researchers at University of Central Florida have discovered a defense peptide that can effectively block the HIV-1 virus from entering and infecting blood cells. The peptide, retrocyclin, has shown minimal resistance to the virus over 100 days, making it a promising candidate for developing an affordable treatment.
New research suggests that sudden, rapid global warming drove the dispersal of early primates from South Asia to Europe and then to North America. The whole event happened within about 25,000 years.
Research suggests that present-day non-human primates, such as rhesus monkeys and macaques, use brain regions similar to those in humans to process species-specific vocalizations. This finding bolsters the hypothesis that a shared ancestor possessed the neural mechanisms for language, which may have evolved in humans.
Scientists suggest that primates evolved good close-up eyesight to avoid snakes, which were the primary predators of modern mammals. Fossil records show that snakes emerged around 100 million years ago, prompting primates to adapt their vision.
The NHGRI has announced new sequencing targets, including the Northern white-cheeked gibbon genome, to gain insights into human health and disease. The gibbon genome is unique due to its high number of chromosome rearrangements and segmental duplications.
Researchers found that gray-cheeked mangabeys revisit fig trees after warm and sunny days, rather than after cold and cloudy days. This suggests monkeys use past weather conditions to inform their foraging decisions.
A post-exposure vaccine has been shown to protect monkeys against the deadly Marburg virus. Researchers tested the vaccine in a study involving non-human primates and found it to be highly effective in preventing severe symptoms of the disease.
A new experimental vaccine has been shown to protect nonhuman primates against Marburg virus infection, even when administered after exposure. The study found that all treated monkeys survived for at least 80 days, while controls succumbed to the disease within 12 days.
Researchers have discovered a 100-kilobase segment of DNA missing from the agouti signaling protein (ASIP) gene in gibbons. The ASIP gene plays a role in lipid metabolism and energy homeostasis, but its deletion may have helped gibbons adapt to arboreal niches. Future studies will examine the physiological effects of this deletion.
A study found that Vesivirus antibodies were present in over 40% of patients with clinical hepatitis, suggesting a potential link between the virus and human disease. The research also highlights the widespread distribution of Vesivirus in various animal species, including fish and primates.
Researchers found that marsupials have a version of trichromatic color vision distinct from primates, with sensitivity to UV wavelengths. The study provides new insights into the evolution of mammalian color vision.
Researchers at Emory University Health Sciences Center successfully transplanted porcine islets into nonhuman primates, achieving insulin independence. The study suggests that xenotransplantation using CD28/CD154 costimulation blockade may be a safe method for reversing human type 1 diabetes.
Diabetic rhesus macaques achieved sustained insulin independence after receiving neonatal porcine islets transplanted with an anti-rejection protocol. The study's success suggests that xenotransplantation may be a viable solution for type 1 diabetes treatment.
Researchers have identified three new species of lemurs, expanding our knowledge of these endangered animals. The study, published in BMC Evolutionary Biology, uses genetic analysis to reveal distinct species characteristics, shedding light on the importance of conservation programs for lemurs native to Madagascar.
Researchers propose that social systems arose as a group defense mechanism against predators, citing studies on male muriqui networks and affiliative hormones in primate species. Positive behaviors like grooming and physical touch increase levels of social bonding hormones.
Primates, including early humans, evolved to avoid predators, not hunt them. This theory suggests that intelligence and social skills developed as a result of outsmarting predators, leading to modern human traits like cooperation and socialization.
Max Planck researchers find that human language processing involves two distinct brain areas, with younger Broca's Area activated for complex grammatical rules and older frontal operculum for simple probability-based rules. The study reveals insights into the evolutionary origins of human language faculty.
The rhesus macaque genome shares about 92-95% of its sequence with humans and 98% with chimpanzees, making it an ideal reference point for comparisons among the three closely related primates. The available genome sequence will facilitate studies in human disease research, vaccine development, and comparative genomic analysis.
Researchers used novel antisense drugs to interrupt normal Ebola virus replication, showing protection in non-human primates. The therapy directly targets the virus and may be more potent than current anti-viral treatments.
Researchers discovered a distinctive variant of the prodynorphin gene in humans, which increases production of neuropeptide prodynorphin. This variant is linked to increased brain size, memory, perception, and sensitivity to pain, as well as potential risks for drug addiction, schizophrenia, and bipolar disorders.
A recent study found that performing monkeys in Asia carry various simian viruses, including simian foamy virus and simian retrovirus. These viruses pose a potential risk of transmission to humans, particularly in settings where people have close contact with non-human primates.
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.
Scientists have discovered that global warming led to drastic changes in ancient forests 55 million years ago, including the appearance of tropical plants from Europe. This finding has implications for understanding the evolution of modern primates and their adaptations.
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.
Recent studies suggest that major variants in genes Microcephalin and ASPM are evolving under strong natural selection in modern human populations. These genetic changes may have emerged as a result of cultural evolution and the spread of agriculture and written language, coinciding with key milestones in human history.
German and Malagasy primatologists have discovered two new lemur species, Mirza zaza and Microcebus lehilahytsara, highlighting biodiversity patterns among humans' closest relatives. The discoveries shed light on human origins and evolution, with lemurs being crucial to understanding ancient primate lineages.
Research involving human stem cells in nonhuman primate brains may be necessary and effective, but oversight boards must consider six key factors to ensure ethics are maintained. The number of human cells used and animal brain size are among the factors considered.
A panel of experts published recommendations to minimize the risk of altering non-human primates' cognitive capacity, focusing on grafting human stem cells into their brains. The panel concluded that healthy adult members of species distantly related to humans are least likely to experience morally significant changes.
A study has found that a primate virus, simian foamy virus, has jumped the species barrier to humans in Asia, primarily through contact with temple macaques. Researchers warn that limiting human-primate interaction can reduce transmission risks and protect both humans and monkeys from disease.