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Alcina A, Fedetz M, Vidal-Cobo I, Andrés-León E, García-Sánchez MI, Barroso-Del-Jesus A, Eichau S, Gil-Varea E, Villar LM, Saiz A, Leyva L, Vandenbroeck K, Otaegui D, Izquierdo G, Comabella M, Urcelay E, Matesanz F. Identification of the genetic mechanism that associates L3MBTL3 to multiple sclerosis. Hum Mol Genet 2022; 31:2155-2163. [PMID: 35088080 PMCID: PMC9262392 DOI: 10.1093/hmg/ddac009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 12/19/2021] [Accepted: 01/10/2022] [Indexed: 11/13/2022] Open
Abstract
Multiple sclerosis (MS) is a complex and demyelinating disease of the central nervous system. One of the challenges of the post-GWAS era is to understand the molecular basis of statistical associations to reveal gene networks and potential therapeutic targets. The L3MBTL3 locus has been associated with MS risk by GWAS. To identify the causal variant of the locus, we performed fine mapping in a cohort of 3440 MS patients and 1688 healthy controls. The variant that best explained the association was rs6569648 (P = 4.13E-10, OR = 0.71, 95% CI = 0.64-0.79), which tagged rs7740107, located in intron 7 of L3MBTL3. The rs7740107 (A/T) variant has been reported to be the best expression and splice quantitative trait locus (eQTL and sQTL) of the region in up to 35 human GTEx tissues. By sequencing RNA from blood of 17 MS patients and quantification by digital qPCR, we determined that this eQTL/sQTL originated from the expression of a novel short transcript starting in intron 7 near rs7740107. The short transcript was translated into three proteins starting at different translation initiation codons. These N-terminal truncated proteins lacked the region where L3MBTL3 interacts with the transcriptional regulator RBPJ (Recombination Signal Binding Protein for Immunoglobulin Kappa J Region) which, in turn, regulates the Notch signaling pathway. Our data and other functional studies suggest that the genetic mechanism underlying the MS association of rs7740107 affects not only the expression of L3MBTL3 isoforms, but might also involve the Notch signaling pathway.
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Affiliation(s)
- Antonio Alcina
- Department of Cell Biology and Immunology, Instituto de Parasitología y Biomedicina "López Neyra", Consejo Superior de Investigaciones Científicas (IPBLN-CSIC) 18016 Granada, Spain
| | - Maria Fedetz
- Department of Cell Biology and Immunology, Instituto de Parasitología y Biomedicina "López Neyra", Consejo Superior de Investigaciones Científicas (IPBLN-CSIC) 18016 Granada, Spain
| | - Isabel Vidal-Cobo
- Department of Cell Biology and Immunology, Instituto de Parasitología y Biomedicina "López Neyra", Consejo Superior de Investigaciones Científicas (IPBLN-CSIC) 18016 Granada, Spain
| | - Eduardo Andrés-León
- Bioinformatic Unit, Instituto de Parasitología y Biomedicina López Neyra (IPBLN-CSIC), Granada, Spain
| | - Maria-Isabel García-Sánchez
- UGC Neurología. Nodo Hospital Universitario Virgen Macarena, Biobanco del Sistema Sanitario Público de Andalucía, Sevilla, (Spain)
| | - Alicia Barroso-Del-Jesus
- Genomics Unit, Instituto de Parasitología y Biomedicina López Neyra (IPBLN-CSIC), Granada, Spain
| | - Sara Eichau
- UGC Neurología. Hospital Universitario Virgen Macarena, Sevilla, Spain
| | - Elia Gil-Varea
- Servei de Neurologia-Neuroimmunologia, Centre d'Esclerosi Múltiple de Catalunya (Cemcat). Institut de Recerca Vall d'Hebron (VHIR). Hospital Universitari Vall d'Hebron. Universitat Autònoma de Barcelona, 08035 Barcelona, Spain
| | - Luisa-Maria Villar
- Departments of Immunology, Hospital Ramon y Cajal, (IRYCIS), Madrid, Spain
| | - Albert Saiz
- Servicio de Neurología, Hospital Clinic and Institut d'Investigació Biomèdica Pi i Sunyer (IDIBAPS), Institut de Neurociències, Universitat de Barcelona, Barcelona, Spain
| | - Laura Leyva
- Instituto de Investigación Biomédica de Málaga-IBIMA, UGC Neurología, Hospital Regional Universitario de Málaga, 29010 Málaga, Spain
| | - Koen Vandenbroeck
- Inflammation & Biomarkers Group, Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain.,IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
| | - David Otaegui
- Neurosciences Area, Biodonostia Health Research Institute, 20014 San Sebastián, Spain
| | - Guillermo Izquierdo
- Multiple Sclerosis Unit, Neurology Service, Vithas Nisa Hospital, 41950 Seville, Spain
| | - Manuel Comabella
- Servei de Neurologia-Neuroimmunologia, Centre d'Esclerosi Múltiple de Catalunya (Cemcat). Institut de Recerca Vall d'Hebron (VHIR). Hospital Universitari Vall d'Hebron. Universitat Autònoma de Barcelona, 08035 Barcelona, Spain
| | - Elena Urcelay
- Lab. of Genetics of Complex Diseases, Hospital Clinico San Carlos, Instituto de Investigacion Sanitaria San Carlos (IdISSC), 28040 Madrid, Spain
| | - Fuencisla Matesanz
- Department of Cell Biology and Immunology, Instituto de Parasitología y Biomedicina "López Neyra", Consejo Superior de Investigaciones Científicas (IPBLN-CSIC) 18016 Granada, Spain
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Cabrera CM, Nieto A, Cortes JL, Montes RM, Catalina P, Cobo F, Barroso-Del-Jesus A, Concha A. The low rate of HLA class I molecules on the human embryonic stem cell line HS293 is associated with the APM components' expression level. Cell Biol Int 2007; 31:1072-8. [PMID: 17459733 DOI: 10.1016/j.cellbi.2007.03.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Revised: 02/19/2007] [Accepted: 03/11/2007] [Indexed: 12/14/2022]
Abstract
Human embryonic stem cells (hESCs) represent a promise for future strategies of tissue replacement. However, there are different issues that should be resolved before these cells can be used in cellular therapies; among others, the rejection of transplantable hESCs as a result of HLA incompatibility between donor cells and recipients. The hESCs exhibit a weak HLA class I expression on the cell surface, but today the responsible mechanisms are unknown. We have analyzed the level expression of HLA class I heavy chain, beta2-microglobulin (beta2-m), and antigen-processing machinery (APM) components (TAP1, TAP2, LMP2, LMP7, and Tapasin) using the HS293 hESC line by real-time quantitative RT-PCR. This analysis has revealed a low expression of beta2-m, HLA-B, and Tapasin, and an absence of expression of: TAP1, TAP2, LMP2, and LMP7 genes in the HS293 hESC line respect to the embryoid bodies (EBs) and the induced stem cells with IFNgamma (with significant differences, p<0.05). The lack or loss of HLA class I molecules due to the down-regulation of the APM components has been frequently found in tumors of different histology as specific mechanisms of immune-evasion. We described for the first time in this report that the hESCs shared similar mechanisms with respect to tumor cells responsible for the weak HLA class I expression on the cell surface.
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Affiliation(s)
- C M Cabrera
- Stem Cell Bank of Andalucia (Spanish Central Node), Hospital Universitario Virgen de las Nieves, Granada, Spain.
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