These piRNA complexes are mostly involved in the epigenetic and post-transcriptional silencing of transposable elements and other spurious or repeat-derived transcripts, but can also be involved in the regulation of other genetic elements in germ line cells. More than 50, unique piRNA sequences have been discovered in mice and more than 13, in D. In the early s, it was discovered that a single mutation in the fruit fly genome could specifically activate all copies of a retrovirus-like element called Gypsy in the female germline. The site of the mutations that made these Gypsies "dance" was thus called the flamenco locus. In , Aravin et al. Indeed, piRNAs are all found in clusters throughout animal genomes; these clusters may contain as few as ten or many thousands of piRNAs matching different, phased transposon fragments.
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Piwi-interacting RNA - Wikipedia
Metrics details. African swine fever virus ASFV is a most devastating pathogen affecting swine. In , ASFV was introduced into Eastern Europe where it continuously circulates and recently reached Western Europe and Asia, leading to a socio-economic crisis of global proportion. In Africa, where ASFV was first described in , it is transmitted between warthogs and soft ticks of the genus Ornithodoros in a so-called sylvatic cycle. In addition, we performed tick infection experiments as well as additional small RNA sequencing of O. Through orthologous dating and molecular clock analyses, we provide data suggesting that integration could have occurred over 1. The pandemic spread of viral pathogens affecting humankind has been recognised for many years as one of the most dangerous scenarios leading to crises of global proportion.
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