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Myosin and actin filaments are highly organized within muscle sarcomeres. Myosin-binding protein C (MyBP-C) is a flexible, rod-like protein located within the C-zone of the sarcomere. The C-terminal domain of MyBP-C is tethered to the myosin filament backbone, and the N-terminal domains are postulated to interact with actin and/or the myosin head to modulate filament sliding. To define where the N-terminal domains of MyBP-C are localized in the sarcomere of active and relaxed mouse myocardium, the relative positions of the N terminus of MyBP-C and actin were imaged in fixed muscle samples using super-resolution fluorescence microscopy. The resolution of the imaging was enhanced by particle averaging. The images demonstrate that the position of the N terminus of MyBP-C is biased toward the actin filaments in both active and relaxed muscle preparations. Comparison of the experimental images with images generated in silico, accounting for known binding partner interactions, suggests that the N-terminal domains of MyBP-C may bind to actin and possibly the myosin head but only when the myosin head is in the proximity of an actin filament. These physiologically relevant images help define the molecular mechanism by which the N-terminal domains of MyBP-C may search for, and capture, molecular binding partners to tune cardiac contractility.In 2019, the United States experienced the highest number of measles importations and cases in the post-elimination era. More than a quarter of imported cases entered the US through California. selleck inhibitor Measles surveillance efforts in California resulted in the identification of 26 importations, 6 outbreaks, and 72 cases in 2019. Only genotype B3 and D8 measles strains were detected. Genotype-specific differences were noted in the incidence of vaccine failures, hospitalizations, and severe complications among cases. A targeted whole genome sequencing (WGS) approach provided higher resolution discrimination between epidemiologically linked and sporadically introduced strains than conventional N450 sequencing. Our report underscores the importance of ensuring appropriate measles vaccination status, especially prior to international travel to measles endemic regions, and highlights the value of a strong measles surveillance system in minimizing outbreaks and preserving measles elimination status in the US.In the course of evolution, pecorans (i.e., higher ruminants) developed a remarkable diversity of osseous cranial appendages, collectively referred to as "headgear," which likely share the same origin and genetic basis. However, the nature and function of the genetic determinants underlying their number and position remain elusive. Jacob and other rare populations of sheep and goats are characterized by polyceraty, the presence of more than two horns. Here, we characterize distinct POLYCERATE alleles in each species, both associated with defective HOXD1 function. We show that haploinsufficiency at this locus results in the splitting of horn bud primordia, likely following the abnormal extension of an initial morphogenetic field. These results highlight the key role played by this gene in headgear patterning and illustrate the evolutionary co-option of a gene involved in the early development of bilateria to properly fix the position and number of these distinctive organs of Bovidae.In this issue, Adams et al. (2021. J. Exp. Med. https//doi.org/10.1084/jem.20201266) show that red blood cells infected with strains of Plasmodium falciparum, which are commonly found in cerebral malaria patients, are specifically internalized by brain endothelial cells, perhaps contributing to the symptoms of the disease.The World Health Organization designated the decade 2020-2030 as the "decade of healthy ageing". It is a tragic irony that the year 2020 should begin with a pandemic that is so lethal for older persons. Not only are older persons the most vulnerable to COVID-19 mortality, but many of the mitigation efforts to slow the spread of the virus have imposed yet further emotional and mental health burdens on the most vulnerable among those over age 70. To help prevent future infectious disease mortality and suffering, as well as the profound health burdens from the chronic diseases associated with ageing, insights from biogerontology must become an integral part of global public health priorities. The timing is ripe for making the public health aspiration of developing an applied gerontological intervention a reality.

The coronavirus disease 2019 (COVID-19) is a viral respiratory illness caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and has led to one of the world's largest infectious disease outbreaks. COVID-19 first emerged in Wuhan, Hubei, China, in December 2019, and the emergence was especially concerning to the U.S. Forces Korea (USFK) stationed in the Republic of Korea (ROK, South Korea), which remains vital to peace and security of the East Asian region. The first wave of cases emerged in South Korea from China before a globally established response, which forced USFK into a challenging position to combat a novel virus with countless unknowns regarding effective control and portended impact.

As cases began to emerge in South Korea, USFK in early February began to proactively formulate peninsula-wide preventative health measures to protect the force. Eventually, USFK spearheaded a uniquely proactive Operation Kill the Virus that targeted COVID-19 as an enemy that must be rigorously defenot be compromised when formulating strategies. The USFK's immediate recognition of the public health threat by all levels of leadership and medical personnel enabled a unique and highly effective Operation Kill the Virus that engaged all members of the community, both local and international.

In successfully executing the operation, USFK imparts three main lessons for future outbreaks. First, a military command should execute a health response similar to how it executes combat operations against a battlefield enemy. Second, the command should maintain flexibility to new changes or risks that alter courses of action. And finally, engagement with the local community, host nation, and international partners should not be compromised when formulating strategies. The USFK's immediate recognition of the public health threat by all levels of leadership and medical personnel enabled a unique and highly effective Operation Kill the Virus that engaged all members of the community, both local and international.