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How is stem cell retroviral

molecules crucial for this crucial and delicate Mantinato in "standby" are indicated by the initials H3K4me3 and H3K27me3, and are classified as so-called epigenetic modifications that influence patterns of gene activity WORDS CHIAVECellule staminaliUna cell embryonic stem cell is controlled by the presence and activity of protein modifications that silence any gene that could prematurely instruct the cell to develop in heart tissue or any other specialized tissue. Thanks to the simultaneous presence of different protein modifications, however, stem cells are ready to develop into specialized cells. This is the report in the journal Cell - Stem Cell, researchers from a broad scientific collaboration between the Genome Institute of Singapore (GIS), the Bioprocessing Technology Institute (BTI), two structures that are part of the Agency Agreement for Science, Technology and Research (A * STAR), and the National University of Singapore (NUS). The molecules that provide this crucial and delicate in maintaining stand-by "are indicated by the initials H3K4me3 and H3K27me3, and are classified as so-called epigenetic modifications that influence the patterns of activation of genes in both human embryonic stem cells and in those mature.Gli scientists have also discovered that genes modified only by a marker, and more specifically H3K4me3, contain the genetic instructions for proteins that allow embryonic stem cells to proliferate or replicate. In the article published in "Cell-Stem Cell, the authors point out that" the prevalence of these genes may be linked to prorietà self-healing stem cells. " Determine how embryonic stem cells are modified by these epigenetic markers may help to explain the unique characteristics of these cells, the ability of self-renewal and pluripotency.
Federico Cesareo

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Cooperation

The discovery of this new "trick" used by HIV to survive suggests that in an infected organism may be much more active than thought viirus WORDS CHIAVEHivreplicazione viraleUna new mode of replication of the retrovirus was del'Hiv discovery by researchers at New York University, illustrating their findings in an article published in the journal Retrovirology. We know that on average only one in a hundred HIV virus is able to successfully complete the integration of its genetic material into the host cell, taking a step essential in order to reproduce. But now a study conducted by a team of researchers led by David N. Levy revealed the existence of a cooperative mechanism that allows you to replicate to some of the remaining 99 viruses, which have also their part in the development of AIDS. According to Levy, HIV functions almost like a community in which the virus can integrate into the DNA of the cell help the least efficient supply of proteins that are necessary for their riprodursi.Questi virus, which went so far considered "lost" and had no influence on the development of the disease just because of the lack of integration may actually even be an advantage over others because, skipping some steps in the replication process, they reproduce faster. "Cooperation between different viruses is another of the tricks used by HIV to survive and it opens the possibility to the fact that there are many in the body viirus more active than previously thought. Understanding how they interact with each other is one of the keys to understanding how HIV evolves and survives the immune response, and we hope that eventually lead us to develop new ways to treat the infection, "Federico Cesareo

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lymphocytes are traitors to terms with the molecules

A type of lymphocytes, regulatory T, help the cancer to survive instead of destroying it. Now it was discovered that a molecule called OX40 is able to make innocuiUna promising innovation for the immunotherapy of the future were defined as the results of the work published by Silvia Piconese the Department of Experimental Oncology National Cancer Institute of Milano.Utilizzare the patient's immune system against cancer, seen as a foreign agent to eliminate, is the basic principle of immunotherapy that has proved a useful tool for the treatment of various cancers. Despite the good results already obtained, there are still many obstacles to achieve full effectiveness of these therapies, the first of the complexity of the immune response and the interactions among many cell types that make up the system immunitario.Piconese and colleagues studied a particular type of cell, regulatory T lymphocytes (T reg), considered a major obstacle to successful immunotherapy.
Federico Cesareo

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A new technique for sequencing DNA

The new method produces results very similar to conventional techniques, but with a lower cost and with a potentially higher resolution
part of an international collaboration, U.S. and Swiss researchers have developed mathematical and statistical tools for reconstruct virus populations, using pyrosequencing, a new technique for DNA sequencing. He reports the latest issue of the online open access journal "PLoS Computational Biology ".
Until recently it was known as the fruit of the pyrosequencing reads were short and often plagued by errors, and scientists have tried to improve it for a long time. Now the new process developed at the ' ETH Zurich has been shown to decrease the error rate and to provide information more quickly and efficiently.
The method was applied to four populations of HIV-1 obtained from patients resistant to the drugs, which were then compared with 165 sequences obtained directly by sequencing, for example by cloning from the same samples. "These new techniques produce results very similar to conventional techniques, but with a lower cost and with a potential resolution higher, "said Niko Beerenwinkel ETH, who participated in the studio.La knowledge of the genetic structure of virus populations is critical for continued biomedical research on disease progression and the design of vaccines and drug resistance. The ability to estimate the structure of virus populations holds great promise for a new and deeper understanding of viral evolution and disease control. Federico Cesareo