{"id":5249,"date":"2024-02-01T11:02:53","date_gmt":"2024-02-01T04:02:53","guid":{"rendered":"https:\/\/wam.vn\/en\/?p=5249"},"modified":"2024-02-01T11:02:53","modified_gmt":"2024-02-01T04:02:53","slug":"where-did-viruses-come-from","status":"publish","type":"post","link":"https:\/\/wam.vn\/en\/where-did-viruses-come-from\/","title":{"rendered":"Where Did Viruses Come From?"},"content":{"rendered":"<p><em><strong>TLDR<\/strong>: Viruses, simple yet impactful, lack traditional fossils but leave molecular traces in host DNA, offering insights into their ancient origins and evolutionary history.<\/em><\/p>\n<p>This article is a summary of a You Tube video &#8220;Where Did Viruses Come From?&#8221; by PBS Eons<br \/>\n<iframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/X31g5TB-MRo?si=9x_nHONziMjAX5-s\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h3>Key Takeaways:<\/h3>\n<ol>\n<li><strong>Viruses&#8217; Nature and Impact:<\/strong> Viruses are simple entities, consisting of genetic material wrapped in protein, impacting life significantly despite their small size.<\/li>\n<li><strong>Absence in Fossil Record:<\/strong> Viruses don\u2019t leave traditional fossils due to their size and fragility, making their history hard to trace.<\/li>\n<li><strong>Molecular Fossils in DNA:<\/strong> Viruses can integrate their genetic material into their host&#8217;s DNA, serving as a sort of molecular fossil that helps trace their history.<\/li>\n<li><strong>Paleovirology:<\/strong> This emerging field combines paleontology and genomics to study ancient viruses by analyzing host genomes.<\/li>\n<li><strong>Virus-Host Interaction:<\/strong> Viruses replicate by infecting host cells and sometimes, their DNA becomes part of the host&#8217;s genetic material, potentially passed down generations.<\/li>\n<li><strong>Virus Evolution and Mutation Rates:<\/strong> Viruses mutate quickly on their own but mutate slower when integrated into host DNA, allowing longer preservation of their genetic material.<\/li>\n<li><strong>Dating Viral Fossils:<\/strong> Scientists use comparative genomics to estimate the age of viruses by finding common viral DNA sequences in different species.<\/li>\n<li><strong>Viruses&#8217; Ancient Origins:<\/strong> Research suggests that viruses are ancient, possibly dating back to the Carboniferous Period (over 300 million years ago) or earlier.<\/li>\n<li><strong>Theories of Viral Origins:<\/strong> Debated models include the virus-first model (viruses predate cellular life), the escape hypothesis (viruses evolved from cellular genes), and the regressive model (viruses evolved from more complex free-living organisms).<\/li>\n<li><strong>Viruses and the Definition of Life:<\/strong> The debate over whether viruses are alive hinges on different criteria for life; they show some characteristics of living organisms but lack others, like self-reproduction and energy production.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Viruses, simple yet impactful, lack traditional fossils but leave molecular traces in host DNA, offering insights into their ancient origins and evolutionary history.<\/p>\n","protected":false},"author":3,"featured_media":5222,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[],"class_list":["post-5249","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","category-44","description-off"],"_links":{"self":[{"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/posts\/5249","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/comments?post=5249"}],"version-history":[{"count":1,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/posts\/5249\/revisions"}],"predecessor-version":[{"id":5253,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/posts\/5249\/revisions\/5253"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/media\/5222"}],"wp:attachment":[{"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/media?parent=5249"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/categories?post=5249"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wam.vn\/en\/wp-json\/wp\/v2\/tags?post=5249"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}