{"id":4315,"date":"2022-03-15T08:00:00","date_gmt":"2022-03-15T02:30:00","guid":{"rendered":"https:\/\/cbirt.net\/staging\/?p=4315"},"modified":"2022-06-18T13:32:25","modified_gmt":"2022-06-18T08:02:25","slug":"computer-scientists-from-rice-university-develop-a-program-variabel-to-find-low-frequency-variants-in-sequence-data","status":"publish","type":"post","link":"https:\/\/cbirt.net\/staging\/computer-scientists-from-rice-university-develop-a-program-variabel-to-find-low-frequency-variants-in-sequence-data\/","title":{"rendered":"Computer Scientists from Rice University Develop a Program &#8216;Variabel&#8217; to Find \u2018Low-Frequency\u2019 Variants in Sequence Data"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Variabel, a novel approach and first method designed for rescuing low frequency intra-host variants from  Oxford Nanopore Technologies (ONT) data alone. Details about variants hidden in the deluge of genetic SARS-CoV-2 sequences might be helpful if researchers can find them.<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A new program developed at Rice University\u2019s George R. Brown School of Engineering will make it possible, at least for \u201cintrahost variants,\u201d those that appear in genome data from the same COVID-19-positive person.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Variabel was developed by a Rice team led by computer scientist Todd Treangen and graduate student Yunxi Liu. It accurately detects &#8220;low-frequency variants&#8221; of the virus that causes COVID-19.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"540\" height=\"333\" src=\"https:\/\/cbirt.net\/staging\/wp-content\/uploads\/2022\/03\/VARIABEL.jpg\" alt=\"VARIABEL\" class=\"wp-image-4316\" srcset=\"https:\/\/cbirt.net\/staging\/wp-content\/uploads\/2022\/03\/VARIABEL.jpg 540w, https:\/\/cbirt.net\/staging\/wp-content\/uploads\/2022\/03\/VARIABEL-300x185.jpg 300w, https:\/\/cbirt.net\/staging\/wp-content\/uploads\/2022\/03\/VARIABEL-356x220.jpg 356w\" sizes=\"auto, (max-width: 540px) 100vw, 540px\" \/><figcaption>Image Description: An illustration defines what differentiates single-nucleotide variants (iSNVs) within a single host from single nucleotide polymorphisms that spread from host to host. Rice University computer scientists have introduced Variabel, which uses sequencing data to identify low-frequency, intra-host variants of SARS-CoV-19 from public data sets. Illustration courtesy of the Treangen Lab<br>Image Source: https:\/\/news.rice.edu\/news\/2022\/covid-19-variants-cant-hide-variabel<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Finding these hints could be crucial in spotting potentially deadly mutations before they spread, according to Treangen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The information is openly accessible to the public, but there is a lot of it. ONT which provides an affordable technology for rapid sequencing of single, lengthy molecules of DNA or RNA, gathered an estimated half-million SARS-CoV-2 genomes for the study.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cVariabel directly enables the use of affordable nanopore sequencing technology for the identification of within-host variation after viral infection,\u201d said Treangen, whose work has focused on infectious disease monitoring since long before the COVID-19 pandemic.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Variabel performed similarly well when tested on sequence data from Ebola and norovirus patients.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The researchers assert that the significance o to Variabel is its ability to distinguish true variants from sequencing errors in the ONT process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They analyzed data from single positive patients across time and sequences from cross-patient datasets collected by ONT and another sequencing technique, Illumina, to confirm Variabel. A single patient can harbor up to a billion copies of a virus over time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They discovered that the computer could fix the vast majority of sequencing errors by comparing findings before and after applying Variabel to the data.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cVariabel opens the door to portable, affordable, and rapid characterization of within-host variation, which ultimately could aid in the discovery of future mutations specific to variants of concern,\u201d said Treangen.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The open-source program, detailed in Nature Communications, is available for download at&nbsp;<a href=\"https:\/\/gitlab.com\/treangenlab\/variabel\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/gitlab.com\/treangenlab\/variabel<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Story Source: <\/em>Liu, Y., Kearney, J., Mahmoud, M.&nbsp;<em>et al.<\/em>&nbsp;Rescuing low frequency variants within intra-host viral populations directly from Oxford Nanopore sequencing data.&nbsp;<em>Nat Commun<\/em>&nbsp;<strong>13,&nbsp;<\/strong>1321 (2022). https:\/\/doi.org\/10.1038\/s41467-022-28852-1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">https:\/\/news.rice.edu\/news\/2022\/covid-19-variants-cant-hide-variabel<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Variabel, a novel approach and first method designed for rescuing low frequency intra-host variants from Oxford Nanopore Technologies (ONT) data alone. Details about variants hidden in the deluge of genetic SARS-CoV-2 sequences might be helpful if researchers can find them. A new program developed at Rice University\u2019s George R. Brown School of Engineering will make&#8230;<\/p>\n","protected":false},"author":3,"featured_media":4316,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[154,153,248,142,155,255,134],"tags":[],"class_list":["post-4315","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bioinformatics","category-corona-virus","category-covid-19","category-covid-19-news","category-data-science","category-ngs","category-trending"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.7 (Yoast SEO v28.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Computer Scientists from Rice University Develop a Program &#039;Variabel&#039; 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