Lifeboat Foundation

A double layer of twisted, folded DNA protects cells from mechanical forces while allowing them freedom to assemble.

Scientists alter the genomes of female fruit flies, allowing them to reproduce without any contribution from a male.

Viral hepatitis is an inflammatory liver disease caused by infection with any of the known hepatitis viruses—A, B, C, D, and E. Most of the global viral hepatitis burden is from hepatitis B and C, which affect 354 million people and result in 1.1 million deaths annually. The Centers for Disease Control and Prevention estimates that in 2020 there were 14,000 and 50,300 new acute infections of hepatitis B and C in the United States, respectively, while at least 880,000 people in the country were living with chronic (long-term) hepatitis B and 2.4 million people had chronic hepatitis C. About half of those with viral hepatitis are unaware of their infection. Chronic and persistent inflammation from the disease can lead to liver failure, cirrhosis, or liver cancer. Viral hepatitis affects all ages and there are pronounced inequities in disease outcomes in the United States. Hepatitis B and C disproportionately affect people living with HIV, and HIV increases the rate of complications and death in people with viral hepatitis.

On this World Hepatitis Day, the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health, shares a snapshot of its investments in basic (laboratory), preclinical (laboratory/animal), and clinical (human) research to improve screening, prevention and treatment for hepatitis B and C. Scientists in the Hepatic Pathogenesis and Structural Virology sections of NIAID’s Laboratory of Infectious Diseases conduct basic and translational research to better understand hepatitis B and C disease progression, clarify the role of hepatitis viruses in liver cancer, and inform discovery of new vaccines, medicine and technologies. Both NIAID’s Division of AIDS (DAIDS) and the Division of Microbiology and Infectious Disease (DMID) support scientific programs focused on hepatitis B and C research and curative strategies, reflecting the widespread impact of viral hepatitis and the urgent need for safe and effective interventions.

Finding a hepatitis B cure.

A new scheme could increase the efficiency of a high-dose cancer radiation therapy and mitigate patient discomfort by reducing particle loss in proton beams.

In this episode, I interview Dr. Robert Sapolsky, Ph.D., Professor of Biology, Neurology & Neurosurgery at Stanford University. We discuss stress, what defines short-term versus long-term stress, and how stress can be beneficial or detrimental, depending on the context. We also discuss stress mitigation and how our sense of control over stress mitigation techniques, including exercise, determine health outcomes. Dr. Sapolsky explains some of the key effects of the hormone testosterone — how it can amplify pre-existing tendencies for aggression or sexual behavior, but that it does not produce those behaviors per se. He also explains how testosterone impacts our social hierarchies, sense of confidence, and willingness to embrace challenges of different kinds. He also explains how our behaviors and perceptions shape testosterone levels. And we discuss estrogen and the powerful role it plays in brain development, health and longevity. Finally, we discuss free will, what it means to have free will, and if we have any free will, including how knowledge alone might allow us to make better decisions for ourselves and society.

#HubermanLab #Testosterone #Stress.

Continue reading “Dr. Robert Sapolsky: Science of Stress, Testosterone & Free Will | Huberman Lab Podcast #35” »

The rising prevalence of antibiotic resistant microbial pathogens presents an ominous health and economic challenge to modern society. The discovery and large-scale development of antibiotic drugs in previous decades was transformational, providing cheap, effective treatment for what would previously have been a lethal infection. As microbial strains resistant to many or even all antibiotic drug treatments have evolved, there is an urgent need for new drugs or antimicrobial treatments to control these pathogens. The ability to sequence and mine the genomes of an increasing number of microbial strains from previously unexplored environments has the potential to identify new natural product antibiotic biosynthesis pathways. This coupled with the power of synthetic biology to generate new production chassis, biosensors and “weaponized” live cell therapeutics may provide new means to combat the rapidly evolving threat of drug resistant microbial pathogens. This review focuses on the application of synthetic biology to construct probiotic strains that have been endowed with functionalities allowing them to identify, compete with and in some cases kill microbial pathogens as well as stimulate host immunity. Weaponized probiotics may have the greatest potential for use against pathogens that infect the gastrointestinal tract: Vibrio cholerae, Staphylococcus aureus, Clostridium perfringens and Clostridioides difficile. The potential benefits of engineered probiotics are highlighted along with the challenges that must still be met before these intriguing and exciting new therapeutic tools can be widely deployed.

The discovery and application of antibiotic drugs is among the most significant accomplishments of medical science. Alexander Fleming’s discovery of penicillin (Fleming, 1929) and subsequent discovery and development of multiple classes of natural product antibiotics have been transformational to modern society. These compounds have yielded cheap and effective treatments for diseases caused by common bacterial infections that would previously have proven fatal. The advent of effective antibiotic drugs has made it possible to survive complex surgical procedures like open heart surgery and organ transplants and extended the average human life-span (Riley, 2005; Kaviani et al., 2020). The benefits of readily available antibiotic drugs have extended into agriculture and aquaculture, making it possible to increase productivity of farmed animals (Park et al., 1994; Patel et al., 2020).

QUT researchers have developed a new approach for designing molecular ON-OFF switches based on proteins which can be used in a multitude of biotechnological, biomedical and bioengineering applications.

The research team demonstrated that this novel approach allows them to design and build faster and more accurate diagnostic tests for detecting diseases, monitoring water quality and detecting environmental pollutants.

Professor Kirill Alexandrov, of the QUT School of Biology and Environmental Science, lead scientist on the CSIRO-QUT Synthetic Biology Alliance and a researcher with the ARC Centre of Excellence in Synthetic Biology, said that the new technique published in the prestigious scientific journal Nature Nanotechnology demonstrated that protein switches could be engineered in a predictable way.

EGenesis has started transplanting gene-edited pigs’ hearts into infant baboons—and humans may be next.

Early on, every stem cell faces a fateful choice. During skin development, for instance, the embryonic epidermis begins as a single layer of epidermal progenitor cells. Their choice is to become a mature epidermal cell or switch to becoming a hair follicle cell. This so-called fate switch is governed by the transcription factor SOX9. If the progenitor cell expresses SOX9, hair follicle cells develop. If it doesn’t, epidermal cells do.

But there is a dark side to SOX9, as it’s implicated in many of the deadliest cancers worldwide, including lung, skin, head and neck, and bone cancer. In skin, some aberrant adult epidermal stem cells later turn on SOX9 despite their chosen path—and never turn it off, kickstarting a process that ultimately activates cancer genes.

Scientists have never fully understood how this doomed outcome ensues at a molecular level. But now Rockefeller researchers have revealed the mechanisms behind this malignant turn of events. SOX9, it turns out, belongs to a special class of proteins that govern the transfer of genetic information from DNA to mRNA. That means it has the ability to pry open sealed pockets of genetic material, bind to previously silent genes within, and activate them. They published their results in Nature Cell Biology.