title: Genetic variation in long noncoding RNAs and the risk of nonalcoholic fatty liver disease.
abstract: The human transcriptome comprises a myriad of non protein-coding RNA species, including long noncoding RNAs (lncRNAs), which have a remarkable role in transcriptional and epigenetic regulation. We hypothesized that variants in lncRNAs influence the susceptibility to nonalcoholic fatty liver disease (NAFLD). Using next generation sequencing, we performed a survey of genetic variation associated with randomly selected lncRNA-genomic regions located within both experimentally validated and computationally predicted regulatory elements. We used a two-stage (exploratory, n = 96 and replication, n = 390) case-control approach that included well-characterized patients with NAFLD diagnosed by liver biopsy. We sequenced > 263 megabase pairs at quality score > Q17, in a total of 2,027,565 reads, including 170 lncRNA-genomic regions. In the sequencing analysis and the validated dataset, we found that the rs2829145 A/G located in a lncRNA (lnc-JAM2-6) was associated with NAFLD and the disease severity. Prediction of regulatory elements in lnc-JAM2-6 showed potential sequence-specific binding motifs of oncogenes MAFK and JUND, and the transcription factor CEBPB that is involved in inflammatory response. The A-allele was significantly associated with NAFLD as disease trait (p = 0.0081) and the disease severity (NASH-nonalcoholic steatohepatitis vs controls: OR 2.36 [95% CI: 1.54-3.62], p = 0.000078). The A-allele carriers also have significantly higher body mass index and glucose-related traits compared with homozygous GG. Hence, our results suggest that variation in lncRNAs contributes to NAFLD severity, while pointing toward the complexity of the genetic component of NAFLD, which involves still unexplored regulatory regions of the genome.
authors.affiliation: Department of Clinical and Molecular Hepatology, Institute of Medical Research A Lanari-IDIM, University of Buenos Aires - National Scientific and Technical Research Council (CONICET), Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: Silvia
authors.initials: S
authors.lastname: Sookoian
authors.affiliation: Biomedical Genomics and Evolution Laboratory. Ecology, Genetics and Evolution Department, Faculty of Science, IEGEBA, University of Buenos Aires, National Scientific and Technical Research Council (CONICET), Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: Cristian
authors.initials: C
authors.lastname: Rohr
authors.affiliation: Department of Molecular Genetics and Biology of Complex Diseases, Institute of Medical Research A Lanari-IDIM, University of Buenos Aires, National Scientific and Technical Research Council (CONICET), Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: Adrián
authors.initials: A
authors.lastname: Salatino
authors.affiliation: Biomedical Genomics and Evolution Laboratory. Ecology, Genetics and Evolution Department, Faculty of Science, IEGEBA, University of Buenos Aires, National Scientific and Technical Research Council (CONICET), Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: Hernán
authors.initials: H
authors.lastname: Dopazo
authors.affiliation: Department of Molecular Genetics and Biology of Complex Diseases, Institute of Medical Research A Lanari-IDIM, University of Buenos Aires, National Scientific and Technical Research Council (CONICET), Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: Tomas
authors.initials: T
authors.lastname: Fernandez Gianotti
authors.affiliation: Liver Unit, Medicine and Surgery Department, Hospital Abel Zubizarreta, Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: Gustavo O
authors.initials: GO
authors.lastname: Castaño
authors.affiliation: Department of Molecular Genetics and Biology of Complex Diseases, Institute of Medical Research A Lanari-IDIM, University of Buenos Aires, National Scientific and Technical Research Council (CONICET), Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: Carlos J
authors.initials: CJ
authors.lastname: Pirola
mesh_terms: D044127:Epigenesis, Genetic; D005260:Female; D015870:Gene Expression; D020022:Genetic Predisposition to Disease; D014644:Genetic Variation; D006801:Humans; D008297:Male; D008875:Middle Aged; D065626:Non-alcoholic Fatty Liver Disease / Q000235:genetics* / Q000473:pathology; D062085:RNA, Long Noncoding / Q000235:genetics*
chemical_list: D062085:RNA, Long Noncoding
keywords: NAFLD; epigenetics; gene expression; lncRNAs; nonalcoholic steatohepatitis