Catálogo de publicaciones - revistas

<jats:p>On this week's show: Scaling up cellulosic ethanol and a news roundup.</jats:p>

<jats:p> As next generation sequencing (NGS) platforms advance in their speed, ease-of-use, and cost-effectiveness, many researchers are transitioning from microarrays to RNA sequencing (or RNA-seq) for their gene expression analysis needs. RNA-seq goes beyond differential gene expression to provide fundamental insights into how genomes are organized and regulated. Some RNA-seq platforms also offer higher sensitivity, increased sample number flexibility, and the ability to analyze highly degraded or rare samples from as little as 10 ng of input RNA. During this webinar, our expert speakers will discuss how NGS and RNA-seq can be broadly applied, including for the analysis of gene regulation through allelic expression and long non-coding RNAs, particularly in pharmacogenomics; for identification of novel microRNAs and transcript isoforms in stem cells; or for the discovery of new tumor biomarkers in archived formalin-fixed, paraffin-embedded samples. <jats:list list-type="bullet"> <jats:list-item> <jats:p> <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://webinar.sciencemag.org/webinar/archive/expanding-scope-rna-seq">View the Webinar</jats:ext-link> </jats:p> </jats:list-item> </jats:list> </jats:p>

<jats:p>A weekly roundup of information on newly offered instrumentation, apparatus, and laboratory materials of potential interest to researchers.</jats:p>

<jats:title>Immune cells and bugs make a sugary coat</jats:title> <jats:p> Epithelial cells line the intestinal tract and help to keep the peace between our immune system and our trillions of gut microbes. Such peacekeeping requires glycosylated proteins (proteins with attached carbohydrate chains) present on the epithelial cell surface, but how glycosylation occurs is unclear. Goto <jats:italic>et al.</jats:italic> find that fucosylation (a type of glycosylation) of gut epithelial cells in mice requires gut microbes (see the Perspective by Hooper). This process also requires innate lymphoid cells there, which produce the cytokines interleukin-22 and lymphotoxin, presumably in response to microbial signals. These cytokines signal epithelial cells to add fucose to membrane proteins, which allows the détente between microbes and immune cells to continue. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.1254009">10.1126/science.1254009</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6202" page="1248" related-article-type="in-this-issue" vol="345" xlink:href="10.1126/science.1259808">1248</jats:related-article> </jats:p>

<jats:title>Response to pathogens is in the genes</jats:title> <jats:p> T cells are important in mounting immune responses to a host of pathogens, and they have also been implicated in autoimmune disease. By examining the variability in gene expression in stimulated T cells over time from a multi-ethnic cohort of healthy humans, Ye <jats:italic>et al.</jats:italic> identified specific genetic polymorphisms that explain differences among individuals in response to pathogens. Furthermore, a candidate gene approach led to the identification of a single-nucleotide polymorphism that controls the response of the autoimmune-associated IL2RA gene. This study helps us understand the degree to which immune responses are driven by the environment or by an individual's physiological or genetic factors. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.1254665">10.1126/science.1254665</jats:related-article> </jats:p>

<jats:p>The devastating Ebola epidemic in West Africa is the result of a perfect storm: dysfunctional health services as the result of decades of war, low public trust in government and Western medicine, traditional beliefs and even denials about the cause or existence of the virus, and burial practices that involve contact with contagious Ebola-infected corpses. There are now five affected West African countries: Guinea, Liberia, Nigeria, Sierra Leone, and most recently, Senegal. Ebola has killed around 2000 and infected more than 3500, with over 40% of cases occurring within the past few weeks. The World Health Organization (WHO) predicts that 20,000 may become infected. This fast pace of Ebola's spread is a grim reminder that epidemics are a global threat and that the only way to get this virus under control is through a rapid response at a massive global scale—much stronger than the current efforts.</jats:p>

<jats:p>A roundup of weekly science policy and related news.</jats:p>