QUASISPECIES FEATURE IN SARS-CoV-2

Since the identification of the SARS-CoV-2, genus Beta- Coronavirus, in January 2020, the virus quickly spread in less than 3 months to all continents with a susceptible human population of about a 7.9billion, and still in active circulation. In the process, it has accumulated mutations leading to genetic diversity. Regular emergence of variants of concern/significance in different ecology shows genetic heterogeneity in the base population of SARS-CoV-2 that is continuously expanding with the passage of the virus in the vast susceptible human population. Natural selection of mutant occurs frequently in a positive sense (+) single-stranded (ss) RNA virus upon replication in the host.  The Pressure of sub-optimal levels of virus-neutralizing antibodies and also innate immunity influence the process of genetic/ antigenic selection. The fittest of the mutants, that could be more than one, propagate and emerge as variants. The existence of different lineages, clades, and strains, as well as genetic heterogeneity of plaque purified virus population, justifies SARS-CoV-2 as ‘Quasispecies’ that refers to swarms of mutant sequences generated during replication of the viral genome, and all mutant sequences may not lead to virion. Viruses having a quasispecies nature may end up with progressive antigenic changes leading to antigenic plurality that is driven by ecology, and this phenomenon challenges vaccination-based control programs

Plants and endophytes – a partnership for the coumarin production through the microbial systems

Plant-based secondary metabolite production system is well established. However, host–endophyte interaction in the production of secondary metabolite is a new less exploited area that is overcoming barriers and evolving as one of the prospective fields. Endophytes such as bacteria or fungi have the ability to produce some of the secondary metabolites that mimic the plant metabolites therefore escaping the host defence system. Coumarin is one such metabolite with immense biological functions. Most of the studies have demonstrated coumarin production from fungal endophytes but not bacterial endophytes. Herein, we present an overview of all the coumarin derivatives produced from endophytic sources and their biosynthetic pathways. Furthermore, the review also throws light on the isolation of these coumarins and different derivatives with respect to their biological activity. The biotransformation of coumarin derivatives by the action of endophytic fungi is also elaborated. The present review provides an insight on the challenges faced in the coumarin production through fungal endophytes

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Not AvailableSince the identification of the SARS CoV 2 genus Beta Coronavirus in January 2020 the virus quickly spread in less than 3 months to all continents with a susceptible human population of about a 7.9 billion, and still in active circulation. In the process, it has accumulated mutations leading to genetic diversity. Regular emergence of variants of concern/significance in different ecology shows genetic heterogeneity in the base population of SARS CoV 2 that is continuously expanding with the passage of the virus in the vast susceptible human population. Natural selection of mutant occurs frequently in a positive sense single stranded (ss) RNA virus upon replication in the host. The Pressure of sub optimal levels of virus neutralizing antibodies and also innate immunity influence the process of genetic or antigenic selection. The fittest of the mutants, that could be more than one, propagate and emerge as variants. The existence of different lineages, clades, and strains as well as genetic heterogeneity of plaque purified virus population justifies SARS CoV 2 as Quasispecies that refers to swarms of mutant sequences generated during replication of the viral genome and all mutant sequences may not lead to virion. Viruses having a quasispecies nature may end up with progressive antigenic changes leading to antigenic plurality that is driven by ecology and this phenomenon challenges vaccination based control programsNot Availabl

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Not AvailableThe present review describes about the disease and the fungal agent in brief, and also stresses for establishment of mechanically ventilated hospital wards across the country. Second wave of COVID-19 pandemic in India has been complicated by high infection rate (R0), 600% jump in medical oxygen demand by COVID hospitals, and after all emergence of Mucormycosis since April-May 2021 leading to fatal complications. Mucormycosis is a very rare infection in humans. It is caused by exposure to mucor mould/ fungi which is commonly found in soil, plants, manure, and decaying fruits and vegetables. These Fungi belonging to the class Zygomycetes and order Mucorales often cause devastating angio-invasive infections, primarily in co-morbid and immunocompromised patients. The emergence of mucormycosis is being reported globally. In India, people with diabetes mellitus are highly susceptible to the disease. But during the second wave of Covid-19 in India, several cases of mucormycosis, also called the "black fungus" disease, have been reported among convalescing and convalescent COVID-19 patients across India with a mortality rate of 50%. More than 5000 cases of mucormycosis during the second wave of Covid-19, have been reported in about 21 states of the country, with Maharashtra and Gujarat states reporting highest number of cases (as on 21 May 2021). The infection has claimed over 120 lives so far, and has complicated recovery from Covid-19 in many more. The Indian Union health ministry has declared mucormycosis as a notified disease under the Epidemic Diseases Act, 1897Not Availabl

Evaluating the Antimicrobial and Anti-Hemolytic Activity of Synthesized Pseudopeptide against <i>Leptospiral</i> Species: In Silico and In Vitro Approach

Bacterial infections are one of the leading causes of morbidity, mortality, and healthcare complications in patients. Leptospirosis is found to be the most prevalent, re-emergent, and neglected tropical zoonotic disease worldwide. The adaptation to various environmental conditions has made Leptospira acquire a large genome (~4.6 Mb) and a complex outer membrane, making it unique among bacteria that mimic the symptoms of jaundice and hemorrhage. Sph2 is another important virulence factor that enhances hemolytic sphingomyelinase—capable of moving inside mitochondria—which increases the ROS level and decreases the mitochondrial membrane potential, thereby leading to cell apoptosis. In the present study, 25 suspected bovine serum samples were subjected to the Microscopic Agglutination Test (MAT) across the Mysuru region. Different samples, such as urine, serum, and aborted materials from the confirmed MAT-positive animals, were used for isolation and genomic detection by conventional PCR targeting virulence gene, Lipl32, using specific primers. Further, in vitro and in silico studies were performed on isolated cultures to assess the anti-leptospiral, anti-hemolytic, and sphingomyelinase enzyme inhibition using novel pseudopeptides. The microdilution technique (MDT) and dark field microscope (DFM) assays revealed that at a concentration of 62.5 μg/mL, the pseudopeptide inhibited 100% of the growth of Leptospira spp., suggesting its efficiency in the treatment of leptospirosis. The flow cytometry analyses show the potency of the pseudopeptide against sphingomyelinase enzymes using human umbilical vein endothelial cells (HUVECs). Thus, the present study demonstrated the efficacy of the pseudopeptide in the inhibition of the growth of Leptospira, and therefore, this can be used as an alternative drug for the treatment of leptospirosis