Virologie最新文献

The yeast Saccharomyces cerevisiae has long been an essential model in molecular biology. Its exceptional recombination capacity and efficiency in propagating large DNA fragments surpass those of organisms such as Escherichia coli or Bacillus subtilis. These properties make S. cerevisiae the preferred choice for cloning and manipulating bacterial and viral genomes. Among the available methods, transformation-associated recombination (TAR) cloning has established itself as a reliable and effective approach for isolating and manipulating large DNA molecules. To date, numerous viral genomes have been successfully cloned in yeast. The ability to modify these cloned genomes and reconstitute infectious viral particles highlights the role of S. cerevisiae as a powerful bioengineering platform. Its versatility addresses various biomedical needs, including virus research, vaccine production, and gene therapy. Combining efficiency, reliability, and flexibility, S. cerevisiae stands out as an invaluable tool for advancing biomedical applications and tackling modern biological challenges.

TTick-borne encephalitis (TBE), caused by the tick-borne encephalitis virus (TBEV), is primarily transmitted to humans through Ixodes tick bites. TBEV comprises three main subtypes describing distinct severity and clinical course: European (TBEV-Eu), Siberian (TBEV-Sib), and Far Eastern (TBEV-Fe). Over the past decade, TBE epidemiology significantly changed in Europe, with an increasing incidence in endemic countries and the discovery of new human case foci and areas of virus circulation. This emergence involves many factors whose impact is not easily determined. While most TBEV-Eu infections are asymptomatic, some patients develop meningitis, or meningoencephalitis, associated with post-infectious sequelae. Several studies recently evaluated the burdens of these sequelae and their associated medical costs. During the complex TBE neuropathogenesis, the antagonism between viral and immunological factors is not clearly identified, nor are the predictive factors of clinical severity. New diagnostic tools are being developed. While TBE treatment is currently only symptomatic, several antiviral treatments are under study.

The yeast Saccharomyces cerevisiae has long been an essential model in molecular biology. Its exceptional recombination capacity and efficiency in propagating large DNA fragments surpass those of organisms such as Escherichia coli or Bacillus subtilis. These properties make S. cerevisiae the preferred choice for cloning and manipulating bacterial and viral genomes. Among the available methods, transformation-associated recombination (TAR) cloning has established itself as a reliable and effective approach for isolating and manipulating large DNA molecules. To date, numerous viral genomes have been successfully cloned in yeast. The ability to modify these cloned genomes and reconstitute infectious viral particles highlights the role of S. cerevisiae as a powerful bioengineering platform. Its versatility addresses various biomedical needs, including virus research, vaccine production, and gene therapy. Combining efficiency, reliability, and flexibility, S. cerevisiae stands out as an invaluable tool for advancing biomedical applications and tackling modern biological challenges.

Hepatitis E virus (HEV) belongs to the Hepeviridae family, Orthohepevirinae subfamily, Paslahepevirus genus which includes eight genotypes. HEV genotype 1 (HEV-1) and genotype 2 (HEV-2) are specific to humans, while genotype 3 (HEV-3) and genotype 4 (HEV-4) circulate mainly in pigs, wild boars and deer, but have also a zoonotic potential. HEV genotype 5 (HEV-5) and 6 (HEV-6) viruses circulate in wild boars in Japan and genotype 7 (HEV-7) and 8 (HEV-8) viruses circulate in camelids. The worldwide distribution of HEV is influenced by ecological and socioeconomic factors. In developing countries in Africa, transmission of the virus through fecally contaminated water accounts for a high proportion of epidemics. Direct human-to-human transmission is less frequent, although cases of infection through blood transfusion have been reported in several countries. Thanks to the "One Health" approach, zoonotic transmissions of HEV from pig to human have been more recently observed. These zoonotic infections are mainly due to the handling or consumption of pork meat or contact with pig manure, contaminating the environment. They alert on professions or populations at-risk, such as livestock farmers or butchers. In addition, HEV infection is particularly severe in pregnant women, leading to fetal and maternal death due to acute liver failure. Finally, the development and application of serological or molecular detection tests in Africa indicates that HEV can be incriminated in symptoms without etiology or falsely attributed to other hepatic viruses or to the yellow fever virus. This review updates studies on the epidemiology of HEV in Africa, a crucial step to better understand the virus and develop surveillance strategies to prevent and better control epidemics.