New studies suggest that vitamin D may help prevent colon cancer by activating the detoxification of lithocholic acid, a known carcinogen. Researchers found that vitamin D acts as a sensor for the toxic chemical, triggering proteins to clear it from the body.
Recent research reveals that astrocytes instruct neural stem cells on which developmental pathway to select, promoting neuronal maturation. The study also found that astrocytes trigger stem cell proliferation and differentiation into neurons, suggesting a new mechanism for regulating neural growth.
A new family of chloride ion channels has been identified in humans, which causes hereditary eye disorders. The discovery was made by a team of researchers at the Howard Hughes Medical Institute and found at least three other members of this channel family in humans, four in fruit flies, and 24 in the worm Caenorhabditis elegans.
Adult neural stem cells isolated from rats' brains can mature into functioning brain cells, forming normal neuronal structures and connections. The study's findings suggest potential for clinical application in regenerating damaged brain tissue.
Researchers identified a novel gene alteration that contributes to colon cancer growth, suggesting a new target for diagnosis and treatment. The discovery also hints at the possibility of reversing methylation-based tumor progression, potentially leading to a non-invasive diagnostic test.
Researchers discovered the ancestral role of VEGF protein guiding developing blood cells to their destinations. The findings suggest that blood vessels may have evolved from blood cells, a theory supported by studies on fruit fly embryos.
Researchers found surprising parallels in RNA virus replication, suggesting a common strategy to kill various viruses. The discovery could lead to more general virus control strategies.
A new mechanism called nonstop decay recognizes and destroys abnormal messenger RNA, potentially interfering with drug treatments for genetic diseases like cystic fibrosis. Thwarting this mechanism may make these treatments more effective.
The Howard Hughes Medical Institute has awarded a four-year grant of $2 million to the European Molecular Biology Organization. The grant supports six scientists from the Czech Republic, Hungary and Poland early in their careers, linking them with EMBO's Young Investigator Programme.
Researchers have discovered a protein, lynx1, that modulates nicotinic acetylcholine receptors, which are involved in nicotine addiction and other neurological disorders. Studying lynx1 has provided insights into its potential role as a therapeutic target for treating nicotine addiction.
Researchers have identified a region of chromosome 4 associated with pancreatic cancer, which may lead to earlier identification and treatment. The discovery has potential implications for understanding the disease's causes and developing new treatments.
Researchers have identified a receptor for the fifth taste, amino acid, which may aid understanding of how animals regulate nutritional intake. The discovery also has potential applications in the food industry, such as formulating new products with specific tastes.
Researchers found that cognitive training could improve memory performance in older adults by increasing activity in the frontal cortex, a region responsible for higher-level intellectual processing. This approach was more effective than simply providing support strategies to overcome non-selective recruitment of cortical regions.
Researchers discovered a gene, wishful thinking (wit), that regulates neural development and synaptic growth in fruit flies. The gene is involved in coordinating muscle growth with synapse growth, essential for proper muscle contraction.
Researchers mapped the neural circuitry of a light-sensing system that governs the body's internal clock and regulates sleep-wake cycles, discoveries that could lead to new treatments for jet lag and depression. The study identified melanopsin as a key player in this system.
Researchers have found that pheromones play a crucial role in mice's gender recognition. The knockout mice, which lacked a gene for a pheromone receptor, were unable to recognize males and displayed unusual mating behavior. This breakthrough provides new insights into the neural circuitry responsible for sex discrimination in mice.
A new test has detected colon cancer gene mutations in about 60% of early-stage colorectal cancer patients, with no false positive tests in healthy individuals. The test's high accuracy and low risk of false positives make it a promising tool for early detection and prevention.
Researchers found that the Hrs protein regulates cell proliferation by tagging receptors for degradation through a process called endocytosis. This finding could lead to new cancer treatments targeting the Hrs protein.
A study has discovered an HIV-like virus in a wild chimpanzee, providing evidence that the virus originated from this species. The virus, SIVcpz, was found in one animal from the Gombe National Park, revealing a different strain than previously known viruses.
Researchers have determined the three-dimensional structure of the chloride ion channel using x-ray crystallography, resolving a long-standing biochemical puzzle. The discovery provides insights into how nature arranges proteins to stabilize anions like chloride inside cell membranes.
A new study by Howard Hughes Medical Institute researchers suggests that bacterial overgrowth, rather than stomach acidity, may be a major cause of stomach ulcers. The study found that proton pump inhibitors can actually promote the growth of other types of bacteria, including Lactobacillus and Staphylococcus.
The Howard Hughes Medical Institute has awarded $16.25 million in new grants to 43 outstanding biomedical researchers from Canada and five Latin American countries. The recipients are investigating various biomedical topics, including parasitic diseases and cancer.
A new model developed by researchers suggests that the risk of contracting mad cow disease from infected sheep is likely to be higher than from cattle due to stricter control measures. However, implementing regulations such as slaughtering young sheep and banning animal products in feed can reduce this risk significantly.
Researchers have found that mice with a knocked-out Hoxb8 gene exhibit excessive grooming behavior, creating bald spots and skin wounds. This discovery suggests that Hox genes may regulate behavior in the adult brain, offering potential insights into human obsessive-compulsive disorders.
A protective protein called a chaperone suppresses the toxicity of alpha-synuclein, a protein associated with Parkinson's disease. The study found that augmenting levels of Hsp70 corrected the deficit and overcame the toxic effect of loss of chaperone function.
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.
Scientists discovered a receptor tyrosine kinase in single-celled choanoflagellates, a group of protists with characteristics similar to those of multicellular animals. The finding provides strong support for the hypothesis that choanoflagellates are closely related to metazoans and may represent modern examples of animal ancestors.
A team of researchers led by Jeannie T. Lee has identified the CTCF protein as a central regulator of X-chromosome inactivation, sparking new insights into the mechanism behind this process. The discovery sheds light on how the developing embryo chooses which X chromosome to inactivate.
Scientists discover that the Math1 gene triggers the differentiation of three types of intestinal cells from stem cells, including goblet, enteroendocrine, and Paneth cells. This finding provides significant insights into the regulatory control of intestinal stem cells and their role in disease treatment.
Research suggests that Alzheimer's disease may be caused by defects in a protein's role as an attachment point for a molecular motor that transports packets of protein within nerve cells. The study found that the missing protein, APP, and other proteins stay mainly in the cell body when it is absent, stalling normal cargo transport.
Researchers distinguish a new type of leukemia called mixed-lineage leukemia (MLL) that is genetically different from acute lymphoblastic leukemia (ALL). The study used DNA microarrays to compare gene expression profiles and found clues about the origin of MLL, suggesting it is caused by arrested maturation of lymphocytes.
A team of scientists led by Joanne Chory and Detlef Weigel studied the natural variation in light sensitivity across different Arabidopsis varieties. They found that strains from lower latitudes were less sensitive to light, and that specific genetic mutations affected the molecule's ability to transmit signals. The study sheds light o...
Researchers have discovered two independent pathways for mRNA export from the nucleus, revealing the role of adapter proteins in regulating this process. The study used cell-permeable peptides to selectively block the action of these proteins, demonstrating their importance in transporting mRNAs for early response genes.
A genetic 'thermostat' called LRP5 regulates bone mass during growth and may contribute to normal variation in bone strength. The discovery could lead to new treatments for rare genetic disorders and potentially increase bone density in the general population.
A precise sensory map of odor receptors has been identified in the olfactory cortex, revealing how signals from different receptors are arranged and combined to yield diverse odor perceptions. This organized map is virtually identical in different individuals, providing new insights into the processes underlying odor perception.
A study by Hong Wu and colleagues found that knocking out the gene Pten in mice hyper-activated a signaling pathway regulating cell proliferation and death in the brain. This led to an increase in brain size and cell number, suggesting PTEN regulates neural stem cell growth.
Researchers identified the PRL-3 gene, which is consistently overexpressed in metastatic liver cells from colon cancers. This enzyme codes for a tyrosine phosphatase that may play a role in colon cancer metastasis.
Researchers have discovered a novel calcium-selective ion channel gene, CatSper, that controls the flow of calcium into the tails of spermatozoa. This finding could lead to the development of a new type of contraceptive that targets this protein, potentially offering fewer side effects than current hormone-based contraceptives.
Researchers have pinpointed the cause of thrombotic thrombocytopenic purpura (TTP), a deadly inherited blood-clotting disorder, as mutations in the ADAMTS13 enzyme gene. The study suggests that administering an active form of the enzyme could be a treatment option for TTP.
Scientists have discovered that variations in the Kif1C protein affect anthrax resistance in mice, potentially leading to better diagnostics and treatments. The research found that resistant strains had missense polymorphisms in the gene, increasing their ability to survive the toxin's effects.
Researchers discovered that blood vessels signal pancreatic cell differentiation, challenging the long-held assumption that organs develop independently. The study found that removing blood vessels from pancreatic tissue disrupts normal gene expression and insulin production.
Amita Sehgal and colleagues report a new link between the neurofibromatosis-1 gene and the body's circadian clock, revealing a new facet of the circadian control system. The findings show that the Nf1 protein regulates the cellular switch MAP kinase.
A team of researchers has identified a key enzyme involved in the consolidation of long-term memories, revealing new insights into the molecular processes underlying learning and memory. The study found that eliminating this enzyme led to impaired memory retention, highlighting its critical role in memory consolidation.
Research in mice reveals that TAFII105 is a cell-type specific component of the transcription machinery, controlling egg formation and potentially linked to female infertility. The study provides new avenues for understanding the complex transcriptional mechanisms underlying cell-specific gene expression.
The Howard Hughes Medical Institute is awarding $1 million each to 20 researchers who plan to revolutionize undergraduate science education. The selected HHMI Professors will receive grants to apply their creativity and enthusiasm to teaching, with a focus on fostering interdisciplinary research teams and mentorship.
A team of researchers led by Louis J. Ptacek identified a novel gene, mass1, responsible for audiogenic reflex epilepsy in the Frings mouse strain. The gene was found to be mutated in mice with spontaneous seizures triggered by loud noises.
A genome-wide study of 308 long-lived individuals revealed a significant correlation between allele sharing on chromosome 4 and longevity. This suggests that the region may contain genes influencing human lifespan, with potential applications in preventing age-associated diseases such as heart disease and Alzheimer's disease.
Researchers found that Drosophila neural precursor cells sequentially activate four different transcription factors, allowing them to maintain differences based on their time of birth. This 'memory' is crucial for normal brain development and may have implications for understanding human neural development.
Researchers at Howard Hughes Medical Institute developed a new parallel focusing method to solve the Poisson-Boltzmann equation, enabling efficient simulation of complex biomolecules. This approach allows for high-resolution modeling of molecules like microtubules and ribosomes, providing insights into their collective properties and p...
A study published in Science identified two genes, WNK1 and WNK4, that cause pseudohypoaldosteronism type II (PHAII), a disorder leading to hypertension. The researchers found that the mutated genes are overexpressed in affected family members, leading to increased salt reabsorption and blood pressure.