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Retrovirus - PubMed

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Last Updated: 06 January 2023

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Human Endogenous Retrovirus (HERV) Transcriptome Is Dynamically Modulated during SARS-CoV-2 Infection and Allows Discrimination of COVID-19 Clinical Stages.

We performed a high-throughput expression analysis of 3,300 specific HERV loci in ten healthy controls' and 16 people who were either convalescent or retesting positive after convalescence, allowing us to gain insight into this poorly understood interplay. According to the disease stage and representing COVID-19 immune signatures, the exposure to SARS-CoV-2 infection modulates HERV expression. We were able to identify a total of 282 differently expressed HERV loci in the patients exposed to SARS-CoV-2 disease in the individuals exposed to SARS-CoV-2 infection in the individuals exposed to the disease independent of the clinical manifestation. In addition, 278 and 60 deHERV loci between C and RTP patients were found, as well as a 164 deherv loci between C and RTP patients. The identified HERV loci was found in 36 different HERV groups, including representatives of all three classes. The present research provides an exhaustive review of the HERV transcriptome in PBMCs and its dynamic presence of COVID-19, revealing specific modulation patterns in response to the disease's clinical manifestation and outcome. IMPORTANCE WE PRINT this article The first high-throughput evaluation of HERV loci expression during SARS-CoV-2 disease was done here, as well as with peripheral blood mononuclear cells.

Source link: https://doi.org/10.1128/spectrum.02516-22


Efficient and Safe Editing of Porcine Endogenous Retrovirus Genomes by Multiple-Site Base-Editing Editor.

However, the porcine genome, which poses a danger of cross-species transmission and hinders the clinical application of xenotransplantation, has remained intact. However, Cas9-mediated DNA damage at several PERV sites in the porcine genome, which promotes senescence and apoptosis of porcine cells, is also responsible for significant DNA damage. Approximately 10% of cell clones were completely inactivated for PERVs in pig ST cells, according to We found that the plasmid used to edit the PERVs did not integrate into the host genome and influence the modified cell's karyotype.

Source link: https://doi.org/10.3390/cells11243975


Feral Cat Populations and Feline Retrovirus Prevalence in San Mateo County, California in Three Time Periods between 2001 and 2016.

Since the prevalence of feline leukemia virus and feline immunodeficiency virus infections in feral cats in San Mateo County was unknown, this research was initiated in 2004. The Spay/Neuter Clinic and the Shelter itself were analyzed by the Peninsula Humane Society & SPCA to find potential geographic distributions of feral cats with positive retroviral status. In the first two years, the four major cities were the key source of feral cats to the Shelter, S/N Clinic, and of FIV- and FeLV-positive cats; in the third period, half of feral cats to the Shelter were from these cities; in the third period, the majority of feral cats to the Shelter were from these cities; in the third period, 50% of feral cats to the Shelter were from these cities; in the third period, 50% of feral cats to the Shelter, and of FeLV-positive cats were from these cities were from these cities were the major source of feral cats to the Shelter, S/N Clinic, and FeLV- and FeLV-positive cats; Despite a 61. 6 percent decrease in feral cat admissions to the S/N Clinic, male FIV prevalence for males remained unchanged and up for females.

Source link: https://doi.org/10.3390/ani12243477


Enhanced proliferation of oligodendrocyte progenitor cells following retrovirus mediated Achaete-scute complex-like 1 overexpression in the postnatal cerebral cortex in vivo.

In vitro, Ascl1 promotes rapid reprogramming of proliferative astroglia from the early postnatal cerebral cortex to interneuron-like cells. In vivo, we investigated whether Ascl1 would similarly promote neuronal reprogramming of glia in the postnatal mouse cerebral cortex. We injected cortical glia into the mouse cerebral cortex in the hopes of reaching this target. However, we saw a dramatic decrease in the relative number of retrovirus-transduced Sox10-positive oligodendrocyte progenitor cells in comparison to glial fibrillary acidic protein-positive astrocytes. Rather, EdU incorporation experiments showed that Ascl1 led to a selective rise in OPC production, but not astrocytes. Ascl1 is a selective promoter of OPC proliferation, according to our results, rather than inducing neuronal reprogramming of glia in the early postnatal cortex.

Source link: https://doi.org/10.3389/fnins.2022.919462


Marsupial genome analysis suggests that satellite DNA formation from walb endogenous retrovirus is an event specific to the red-necked wallaby.

About N. eugenii, the red-necked wallaby 2-3 million years ago, it is thought to have diverged from the red-necked wall a few decades ago. In PCR analyses of these two and other closely related animals, walbRep-specific fragment amplification was seen only in the red-necked wallaby. Sequence database searches for the tammar wallaby resulted in sequence alignment lists that were sufficiently detailed to rule out the likelihood of walbRep existence. These results showed that the walbRep formation occurred in the red-necked wallaby lineage after its distainment from the tammar wallaby lineage, thus in a time span of maximum 3 million years.

Source link: https://doi.org/10.1111/gtc.12999


Clinical significance of human endogenous retrovirus K (HERV-K) in multiple myeloma progression.

Human endogenous retroviruses are retrotransposons that infect human germline cells and account for 5-8% of the human genome. In MM, the HERV-K envelope and long-term repeat expression were statistically higher within plasma cells than in monoclonal gammopathy of uncertain importance or controls, according to the authors. HERV-K env knockdown increased proliferation in the MM. 1S cell line and reduced the expression of the tumor suppressor genes TP53 and CDKN1A. Apolipoprotein B mRNA editing enzyme catalytic polypeptide-like 3F, 3G, and 3H expression in MM. 1S cells is down by 10% after a HERV-K knockdown.

Source link: https://doi.org/10.1007/s12185-022-03513-7


Replication competent retrovirus testing (RCR) in the National Gene Vector Biorepository: No evidence of RCR in 1,595 post-treatment peripheral blood samples obtained from 60 clinical trials.

Gammaretroviral vectors carry a variety of risks, including inadvertent exposure to replication-competent retrovirus that can develop during vector manufacturing. We have found no evidence of RCR in 338 pre-treatment and 1,595 post-treatment blood samples from 737 patients enrolled in 60 clinical trials to date. The majority of trials were clinical immunotherapy, and 90 percent of the trials used vector products made with the PG13 packaging cell line. The information presented here provide further evidence that existing manufacturing techniques produce RCR-free products and contribute to the overall safety profile of retroviral gene therapy.

Source link: https://doi.org/10.1016/j.ymthe.2022.12.006


Retrovirus-derived RTL5 and RTL6 genes are novel constituents of the innate immune system in the eutherian brain.

RTL5 and RTL6 are microglial genes with roles in the front line of innate brain immune response responses, according to this study. In microglia, RTL5-MCherry and RTL6-Venus fusion proteins were seen in microglia and granules in the central nervous system, as extracellular dots and granules. RTL6 and Rtl5 knockout mice's experiments showed further evidence that RTL6 and RTL5 action against LPS and dsRNA, respectively in the brain, giving the first evidence that retrovirus-derived genes play a role in the eutherian innate immune system.

Source link: https://doi.org/10.1242/dev.200976

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions