2026-06-14T00:40:35Zhttps://repisalud.isciii.es/rest/oai/request

oai:repisalud.isciii.es:20.500.12105/270362025-12-16T01:17:56Zcom_20.500.12105_2052com_20.500.12105_2051com_20.500.12105_15322col_20.500.12105_19609col_20.500.12105_16988

00925njm 22002777a 4500 dc Martinez-Laso, Jorge author Cervera Hernandez, Isabel author Martinez-Carrasco, Marina S author Briz, Veronica author Crespo-Bermejo, Celia author Sánchez-Menéndez, Clara author Casado-Fernández, Guiomar author Torres, Montserrat author Coiras, Mayte author 2025-01-23 Retinoic acid inducible gene I (RIG-I)-like receptors (RLRs), including RIG-I, MDA5 and LGP2, recognize viral RNA to mount an antiviral interferon (IFN) response RLRs share three different protein domains: C-terminal domain, DExD/H box RNA helicase domain, and an N-terminal domain with two tandem repeats (CARDs). LGP2 lacks tandem CARD and is not able to induce an IFN response. However, LGP2 positively enhances MDA5 and negatively regulates RIG-I signaling. In this study, we determined the LGP2 alternative transcripts in humans to further comprehend the mechanism of its regulation, their evolutionary origin, and the isoforms functionallity. The results showed new eight alternative transcripts in the samples tested. The presence of these transcripts demonstrated that the main mechanisms for the regulation of LGP2 expression are both by insertion of introns and by the loss of exons. The phylogenetic analysis of the comparison between sequences from exon 1 to exon 3 of humans and those previously described in non-human primates showed three well-differentiated groups (lineages) originating from gorillas, suggesting that the transspecies evolution has been maintained for 10 million years. The corresponding protein models (isoforms) were also established, obtaining four isoforms: one complete and three others lacking the C-terminal domain or this domain and the partial or total He2 Helicase domain, which would compromise the functionality of LGP2. In conclusion, this is the first study that elucidate the large genomic organization and complex transcriptional regulation of human LGP2, its pattern of sequence generation, and a mode of evolutionary inheritance across species. Jorge Martinez-Laso, Isabel Cervera, Marina S Martinez-Carrasco, Veronica Briz, Celia Crespo-Bermejo, Clara Sánchez-Menéndez, Guiomar Casado-Fernández, Montserrat Torres, Mayte Coiras, Characterisation of LGP2 complex multitranscript system in humans: role in the innate immune response and evolution from non-human primates, Human Molecular Genetics, Volume 34, Issue 1, 1 January 2025, Pages 11–20, https://doi.org/10.1093/hmg/ddae155. 10.1093/hmg/ddae155 Human Molecular Genetics 39505366 https://hdl.handle.net/20.500.12105/27036 LGP2 RLRs Alternative RNA splicing Transpecies evolution Characterisation of LGP2 complex multitranscript system in humans: role in the innate immune response and evolution from non-human primates.