{"id":103493,"date":"2025-04-15T09:34:13","date_gmt":"2025-04-15T07:34:13","guid":{"rendered":"https:\/\/www.pcb.ub.edu\/a-scientific-team-at-irb-barcelona-reveals-the-role-of-hybrid-dna-rna-triplexes-in-gene-regulation\/"},"modified":"2025-04-15T14:53:47","modified_gmt":"2025-04-15T12:53:47","slug":"a-scientific-team-at-irb-barcelona-reveals-the-role-of-hybrid-dna-rna-triplexes-in-gene-regulation","status":"publish","type":"post","link":"https:\/\/www.pcb.ub.edu\/en\/a-scientific-team-at-irb-barcelona-reveals-the-role-of-hybrid-dna-rna-triplexes-in-gene-regulation\/","title":{"rendered":"A scientific team at IRB Barcelona reveals the role of hybrid DNA-RNA triplexes in gene regulation"},"content":{"rendered":"<p><strong>A new study led by researchers at the <a href=\"https:\/\/www.pcb.ub.edu\/en\/empresa\/institut-de-recerca-biomedica-irb-barcelona\/\" target=\"_blank\" rel=\"noopener\">Institute for Research in Biomedicine (IRB Barcelona)<\/a>, based at the Barcelona Science Park, has, for the first time, described which hybrid triplexes (DNA-RNA) are most stable within the cell and how they are distributed throughout the human genome. The research, published in <em>Nucleic Acids Research <\/em>journal, suggests that these triplexes may act as regulatory mechanisms in gene expression and chromatin organization.<br \/>\n<\/strong><\/p>\n<p>DNA, composed of two complementary strands, contains the genetic information essential for cellular function. For a gene to be activated\u2014or expressed\u2014these strands must separate, allowing part of the sequence to be transcribed into RNA, a process known as transcription. This process is tightly regulated, in part due to special structures that form within DNA or RNA and can modulate gene expression.<\/p>\n<p>Among the most notable examples are triplexes, where a third nucleic acid strand binds specifically to the DNA double helix. While DNA-only triplexes have been extensively studied, little has been known until now about those composed of both DNA and RNA\u2014so-called hybrid triplexes\u2014and their biological relevance.<\/p>\n<p>In the recent publication in <em>Nucleic Acids Research<\/em>, researchers from <a href=\"https:\/\/www.irbbarcelona.org\/en\/research\/molecular-modelling-and-bioinformatics\" target=\"_blank\" rel=\"noopener\">Molecular Modelling and Bioinformatics Lab<\/a>, led by <strong>Dr. Modesto Orozco<\/strong> at IRB Barcelona, in collaboration with groups from IQAC and IQFBC (CSIC), the University of Barcelona, Nostrum Biodiscovery, and the University of Cambridge, provide a detailed map of the stability and distribution of hybrid triplexes. To carry out the research, the team relied on biophysical experiments, molecular dynamics simulations, and large-scale bioinformatics analyses.<\/p>\n<p>\u201cWe wanted to understand which types of hybrid triplexes (DNA-RNA) are more stable, where they tend to form in the genome, and whether they relate to the three-dimensional architecture of DNA. This would help us better understand their potential function as regulatory mechanisms,\u201d explains <strong>Dr. Alba Sala<\/strong>, one of the first authors of the study, alongside Dr. Vito Genna, <strong>Dr. Guillem Portella<\/strong>, and <strong>Dr. Montserrat Terrazas<\/strong>.<\/p>\n<div id=\"attachment_103498\" style=\"width: 710px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-103498\" class=\"wp-image-103498\" src=\"https:\/\/www.pcb.ub.edu\/wp-content\/uploads\/2025\/04\/IG-1x1-6-1-e1744704617399.jpg\" alt=\"The study reveals the role of hybrid DNA-RNA triplexes in gene regulation. Image \/ IRB Barcelona\" width=\"700\" height=\"700\" \/><p id=\"caption-attachment-103498\" class=\"wp-caption-text\">The study reveals the role of hybrid DNA-RNA triplexes in gene regulation. Image \/ IRB Barcelona<\/p><\/div>\n<p>After analyzing several DNA-RNA combinations, the researchers discovered that a particular configuration\u2014in which RNA binds to the DNA double helix without fully unwinding it\u2014proved to be the most stable. This finding enabled them to create a computational tool capable of predicting when and where these triplexes might form and whether they could impact gene expression control. Applying the tool to human genome data revealed that triplexes tend to form in key regulatory regions (such as promoters) and at specific chromatin sites. Thus, the team proposes that these structures may contribute both to the physical organization of DNA and to the activation or repression of various genes.<\/p>\n<h3><strong>Implications and Potential Beneficiaries<\/strong><\/h3>\n<p>These findings open up new hypotheses in molecular biology. Researchers in gene regulation and epigenetics may now investigate whether RNA-DNA hybrid triplexes participate in activating or silencing specific genes. Similarly, scientists studying genome architecture could explore how these structures contribute to DNA compaction and stability. Moreover, biomedical researchers may delve into the presence of abnormal triplexes associated with diseases involving deregulated gene expression, such as certain cancers.<\/p>\n<p>In the future, identifying these hybrid triplexes could pave the way for new therapeutic strategies, particularly for diseases involving gene regulation malfunctions. Understanding how these triplexes form and stabilize opens exciting possibilities in drug design aimed at correcting defects in the expression of critical genes.<\/p>\n<p>\u201cOur understanding of how RNA regulates chromatin is evolving. These findings provide further evidence that RNA not only serves as a genetic messenger but can also structurally interact with DNA to modulate its function,\u201d comments <strong>Dr. Orozco<\/strong>, Head of the Molecular Modelling and Bioinformatics Lab at IRB Barcelona and Professor at the University of Barcelona.<\/p>\n<p><strong>\u00bb Article of reference: <\/strong>Systematic study of hybrid triplex topology and stability suggests a general triplex-mediated regulatory mechanism. Vito Genna, Guillem Portella, Alba Sala, Montserrat Terrazas, Israel Serrano-Chac\u00f3n, Javier Gonz\u00e1lez, N\u00faria Villegas, Lidia Mateo, Chiara Castellazzi, Mireia Labrador, Anna Avi\u00f1o, Adam Hospital, Albert Gandioso, Patrick Aloy, Isabelle Brun-Heath, Carlos Gonzalez, Ramon Eritja &amp; Modesto Orozco. Nucleic Acids Research (2025).\u00a0<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/40071936\/\" target=\"_blank\" rel=\"noopener\">doi: 10.1093\/nar\/gkaf170<\/a><\/p>\n<p><strong>\u00bb Link to the news:<\/strong> <a href=\"https:\/\/www.irbbarcelona.org\/en\/news\/scientific\/study-reveals-role-hybrid-dna-rna-triplexes-gene-regulation\" target=\"_blank\" rel=\"noopener\">IRB Barcelona website [+]<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A new study led by researchers at the Institute for Research in Biomedicine (IRB Barcelona), based at the Barcelona Science Park, has, for the first time, described which hybrid triplexes&#8230;<\/p>\n","protected":false},"author":1,"featured_media":103483,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[36],"tags":[260],"class_list":["post-103493","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-irb-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - 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