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Jean-Paul Achkar

Bio: Jean-Paul Achkar is an academic researcher from Cleveland Clinic. The author has contributed to research in topics: Crohn's disease & Inflammatory bowel disease. The author has an hindex of 20, co-authored 60 publications receiving 10393 citations. Previous affiliations of Jean-Paul Achkar include Cleveland Clinic Lerner Research Institute.


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Journal ArticleDOI
31 May 2001-Nature
TL;DR: It is shown that a frameshift mutation caused by a cytosine insertion, 3020insC, which is expected to encode a truncated NOD2 protein, is associated with Crohn's disease, and a link between an innate immune response to bacterial components and development of disease is suggested.
Abstract: Crohn's disease is a chronic inflammatory disorder of the gastrointestinal tract, which is thought to result from the effect of environmental factors in a genetically predisposed host. A gene location in the pericentromeric region of chromosome 16, IBD1, that contributes to susceptibility to Crohn's disease has been established through multiple linkage studies, but the specific gene(s) has not been identified. NOD2, a gene that encodes a protein with homology to plant disease resistance gene products is located in the peak region of linkage on chromosome 16 (ref. 7). Here we show, by using the transmission disequilibium test and case-control analysis, that a frameshift mutation caused by a cytosine insertion, 3020insC, which is expected to encode a truncated NOD2 protein, is associated with Crohn's disease. Wild-type NOD2 activates nuclear factor NF-kappaB, making it responsive to bacterial lipopolysaccharides; however, this induction was deficient in mutant NOD2. These results implicate NOD2 in susceptibility to Crohn's disease, and suggest a link between an innate immune response to bacterial components and development of disease.

4,838 citations

Journal ArticleDOI
Luke Jostins1, Stephan Ripke2, Rinse K. Weersma3, Richard H. Duerr4, Dermot P.B. McGovern5, Ken Y. Hui6, James Lee7, L. Philip Schumm8, Yashoda Sharma6, Carl A. Anderson1, Jonah Essers9, Mitja Mitrovic3, Kaida Ning6, Isabelle Cleynen10, Emilie Theatre11, Sarah L. Spain12, Soumya Raychaudhuri9, Philippe Goyette13, Zhi Wei14, Clara Abraham6, Jean-Paul Achkar15, Tariq Ahmad16, Leila Amininejad17, Ashwin N. Ananthakrishnan9, Vibeke Andersen18, Jane M. Andrews19, Leonard Baidoo4, Tobias Balschun20, Peter A. Bampton21, Alain Bitton22, Gabrielle Boucher13, Stephan Brand23, Carsten Büning24, Ariella Cohain25, Sven Cichon26, Mauro D'Amato27, Dirk De Jong3, Kathy L Devaney9, Marla Dubinsky5, Cathryn Edwards28, David Ellinghaus20, Lynnette R. Ferguson29, Denis Franchimont17, Karin Fransen3, Richard B. Gearry30, Michel Georges11, Christian Gieger, Jürgen Glas22, Talin Haritunians5, Ailsa Hart31, Christopher J. Hawkey32, Matija Hedl6, Xinli Hu9, Tom H. Karlsen33, Limas Kupčinskas34, Subra Kugathasan35, Anna Latiano36, Debby Laukens37, Ian C. Lawrance38, Charlie W. Lees39, Edouard Louis11, Gillian Mahy40, John C. Mansfield41, Angharad R. Morgan29, Craig Mowat42, William G. Newman43, Orazio Palmieri36, Cyriel Y. Ponsioen44, Uroš Potočnik45, Natalie J. Prescott6, Miguel Regueiro4, Jerome I. Rotter5, Richard K Russell46, Jeremy D. Sanderson47, Miquel Sans, Jack Satsangi39, Stefan Schreiber20, Lisa A. Simms48, Jurgita Sventoraityte34, Stephan R. Targan, Kent D. Taylor5, Mark Tremelling49, Hein W. Verspaget50, Martine De Vos37, Cisca Wijmenga3, David C. Wilson39, Juliane Winkelmann51, Ramnik J. Xavier9, Sebastian Zeissig20, Bin Zhang25, Clarence K. Zhang6, Hongyu Zhao6, Mark S. Silverberg52, Vito Annese, Hakon Hakonarson53, Steven R. Brant54, Graham L. Radford-Smith55, Christopher G. Mathew12, John D. Rioux13, Eric E. Schadt25, Mark J. Daly2, Andre Franke20, Miles Parkes7, Severine Vermeire10, Jeffrey C. Barrett1, Judy H. Cho6 
Wellcome Trust Sanger Institute1, Broad Institute2, University of Groningen3, University of Pittsburgh4, Cedars-Sinai Medical Center5, Yale University6, University of Cambridge7, University of Chicago8, Harvard University9, Katholieke Universiteit Leuven10, University of Liège11, King's College London12, Université de Montréal13, New Jersey Institute of Technology14, Cleveland Clinic15, Peninsula College of Medicine and Dentistry16, Université libre de Bruxelles17, Aarhus University18, University of Adelaide19, University of Kiel20, Flinders University21, McGill University22, Ludwig Maximilian University of Munich23, Charité24, Icahn School of Medicine at Mount Sinai25, University of Bonn26, Karolinska Institutet27, Torbay Hospital28, University of Auckland29, Christchurch Hospital30, Imperial College London31, Queen's University32, University of Oslo33, Lithuanian University of Health Sciences34, Emory University35, Casa Sollievo della Sofferenza36, Ghent University37, University of Western Australia38, University of Edinburgh39, Queensland Health40, Newcastle University41, University of Dundee42, University of Manchester43, University of Amsterdam44, University of Maribor45, Royal Hospital for Sick Children46, Guy's and St Thomas' NHS Foundation Trust47, QIMR Berghofer Medical Research Institute48, Norfolk and Norwich University Hospital49, Leiden University50, Technische Universität München51, University of Toronto52, University of Pennsylvania53, Johns Hopkins University54, University of Queensland55
01 Nov 2012-Nature
TL;DR: A meta-analysis of Crohn’s disease and ulcerative colitis genome-wide association scans is undertaken, followed by extensive validation of significant findings, with a combined total of more than 75,000 cases and controls.
Abstract: Crohn's disease and ulcerative colitis, the two common forms of inflammatory bowel disease (IBD), affect over 2.5 million people of European ancestry, with rising prevalence in other populations. Genome-wide association studies and subsequent meta-analyses of these two diseases as separate phenotypes have implicated previously unsuspected mechanisms, such as autophagy, in their pathogenesis and showed that some IBD loci are shared with other inflammatory diseases. Here we expand on the knowledge of relevant pathways by undertaking a meta-analysis of Crohn's disease and ulcerative colitis genome-wide association scans, followed by extensive validation of significant findings, with a combined total of more than 75,000 cases and controls. We identify 71 new associations, for a total of 163 IBD loci, that meet genome-wide significance thresholds. Most loci contribute to both phenotypes, and both directional (consistently favouring one allele over the course of human history) and balancing (favouring the retention of both alleles within populations) selection effects are evident. Many IBD loci are also implicated in other immune-mediated disorders, most notably with ankylosing spondylitis and psoriasis. We also observe considerable overlap between susceptibility loci for IBD and mycobacterial infection. Gene co-expression network analysis emphasizes this relationship, with pathways shared between host responses to mycobacteria and those predisposing to IBD.

4,094 citations

Journal ArticleDOI
Jimmy Z. Liu1, Johannes R. Hov, Trine Folseraas2, Trine Folseraas3, Eva Ellinghaus4, Simon M. Rushbrook5, Nadezhda Tsankova Doncheva6, Ole A. Andreassen3, Ole A. Andreassen2, Rinse K. Weersma7, Tobias J. Weismüller8, Bertus Eksteen9, Pietro Invernizzi, Gideon M. Hirschfield10, Gideon M. Hirschfield11, Daniel Gotthardt, Albert Parés12, David Ellinghaus4, Tejas Shah1, Brian D. Juran13, Piotr Milkiewicz14, Christian Rust15, Christoph Schramm16, Tobias Müller17, Brijesh Srivastava18, Georgios N. Dalekos19, Markus M. Nöthen20, Stefan Herms20, Juliane Winkelmann21, Mitja Mitrovic7, Felix Braun, Cyriel Y. Ponsioen, Peter J. P. Croucher22, Martina Sterneck16, Andreas Teufel23, Andrew Mason24, Janna Saarela25, Virpi Leppa26, Ruslan Dorfman, Domenico Alvaro27, Annarosa Floreani28, Suna Onengut-Gumuscu29, Stephen S. Rich29, Wesley K. Thompson30, Andrew J. Schork30, Sigrid Næss2, Sigrid Næss3, Ingo Thomsen4, Gabriele Mayr6, Inke R. König31, Kristian Hveem32, Isabelle Cleynen1, Isabelle Cleynen33, Javier Gutierrez-Achury7, Isis Ricaño-Ponce7, David A. van Heel34, Einar Björnsson, Richard Sandford18, Peter R. Durie11, Espen Melum2, Espen Melum3, Morten H. Vatn35, Morten H. Vatn3, Morten H. Vatn2, Mark S. Silverberg36, Richard H. Duerr37, Leonid Padyukov38, Stephan Brand15, Miquel Sans, Vito Annese39, Jean-Paul Achkar40, Jean-Paul Achkar41, Kirsten Muri Boberg3, Kirsten Muri Boberg2, Hanns-Ulrich Marschall, Olivier Chazouillères42, Christopher L. Bowlus43, Cisca Wijmenga7, Erik Schrumpf2, Erik Schrumpf3, Severine Vermeire33, Mario Albrecht6, John D. Rioux44, John D. Rioux45, Graeme J.M. Alexander18, Annika Bergquist38, Judy H. Cho46, Stefan Schreiber4, Michael P. Manns8, Martti Färkkilä25, Anders M. Dale30, Roger W. Chapman, Konstantinos N. Lazaridis13, Andre Franke4, Carl A. Anderson1, Tom H. Karlsen 
TL;DR: This analysis compared 3,789 PSC cases of European ancestry to 25,079 population controls across 130,422 SNPs genotyped using the Immunochip to identify 12 genome-wide significant associations outside the human leukocyte antigen (HLA) complex, 9 of which were new, increasing the number of known PSC risk loci to 16.
Abstract: Primary sclerosing cholangitis (PSC) is a severe liver disease of unknown etiology leading to fibrotic destruction of the bile ducts and ultimately to the need for liver transplantation. We compared 3,789 PSC cases of European ancestry to 25,079 population controls across 130,422 SNPs genotyped using the Immunochip. We identified 12 genome-wide significant associations outside the human leukocyte antigen (HLA) complex, 9 of which were new, increasing the number of known PSC risk loci to 16. Despite comorbidity with inflammatory bowel disease (IBD) in 72% of the cases, 6 of the 12 loci showed significantly stronger association with PSC than with IBD, suggesting overlapping yet distinct genetic architectures for these two diseases. We incorporated association statistics from 7 diseases clinically occurring with PSC in the analysis and found suggestive evidence for 33 additional pleiotropic PSC risk loci. Together with network analyses, these findings add to the genetic risk map of PSC and expand on the relationship between PSC and other immune-mediated diseases.

309 citations

Jimmy Z. Liu, Johannes R. Hov, Trine Folseraas, Eva Ellinghaus, Simon M. Rushbrook, Nadezhda Tsankova Doncheva, Ole A. Andreassen, Rinse K. Weersma, Tobias J. Weismueller, Bertus Eksteen, Pietro Invernizzi, Gideon M. Hirschfield, Daniel Gotthardt, Albert Parés, David Ellinghaus, Tejas Shah, Brian D. Juran, Piotr Milkiewicz, Christian Rust, Christoph Schramm, Tobias Mueller, Brijesh Srivastava, Georgios N. Dalekos, Markus M. Noethen, Stefan Herms, Juliane Winkelmann, Mitja Mitrovic, Felix Braun, Cyriel Y. Ponsioen, Peter J. P. Croucher, Martina Sterneck, Andreas Teufel, Andrew Mason, Janna Saarela, Virpi Leppa, Ruslan Dorfman, Domenico Alvaro, Annarosa Floreani, Suna Onengut-Gumuscu, Stephen S. Rich, Wesley K. Thompson, Andrew J. Schork, Sigrid Næss, Ingo Thomsen, Gabriele Mayr, Inke R. Koenig, Kristian Hveem, Isabelle Cleynen, Javier Gutierrez-Achury, Isis Ricaño-Ponce, David A. van Heel, Einar Bjoernsson, Richard Sandford, Peter R. Durie, Espen Melum, Morten H. Vatn, Mark S. Silverberg, Richard H. Duerr, Leonid Padyukov, Stephan Brand, Miquel Sans, Vito Annese, Jean-Paul Achkar, Kirsten Muri Boberg, Hanns-Ulrich Marschall, Olivier Chazouillères, Christopher L. Bowlus, Cisca Wijmenga, Erik Schrumpf, Severine Vermeire, Mario Albrecht, John D. Rioux, Graeme J.M. Alexander, Annika Bergquist, Judy H. Cho, Stefan Schreiber, Michael P. Manns, Martti Färkkilä, Anders M. Dale, Roger W. Chapman, Konstantinos N. Lazaridis, Andre Franke, Carl A. Anderson, Tom H. Karlsen 
04 Jul 2013
Abstract: Primary sclerosing cholangitis (PSC) is a severe liver disease of unknown etiology leading to fibrotic destruction of the bile ducts and ultimately to the need for liver transplantation. We compared 3,789 PSC cases of European ancestry to 25,079 population controls across 130,422 SNPs genotyped using the Immunochip. We identified 12 genome-wide significant associations outside the human leukocyte antigen (HLA) complex, 9 of which were new, increasing the number of known PSC risk loci to 16. Despite comorbidity with inflammatory bowel disease (IBD) in 72% of the cases, 6 of the 12 loci showed significantly stronger association with PSC than with IBD, suggesting overlapping yet distinct genetic architectures for these two diseases. We incorporated association statistics from 7 diseases clinically occurring with PSC in the analysis and found suggestive evidence for 33 additional pleiotropic PSC risk loci. Together with network analyses, these findings add to the genetic risk map of PSC and expand on the relationship between PSC and other immune-mediated diseases.

288 citations

Journal ArticleDOI
Miguel Regueiro1, Brian G. Feagan2, Bin Zou3, Jewel Johanns3  +155 moreInstitutions (17)
TL;DR: Infliximab is not superior to placebo in preventing clinical recurrence after CD-related resection, however, infliximab does reduce endoscopic recurrence.

233 citations


Cited by
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Journal ArticleDOI
Paul Burton1, David Clayton2, Lon R. Cardon, Nicholas John Craddock3  +192 moreInstitutions (4)
07 Jun 2007-Nature
TL;DR: This study has demonstrated that careful use of a shared control group represents a safe and effective approach to GWA analyses of multiple disease phenotypes; generated a genome-wide genotype database for future studies of common diseases in the British population; and shown that, provided individuals with non-European ancestry are excluded, the extent of population stratification in theBritish population is generally modest.
Abstract: There is increasing evidence that genome-wide association ( GWA) studies represent a powerful approach to the identification of genes involved in common human diseases. We describe a joint GWA study ( using the Affymetrix GeneChip 500K Mapping Array Set) undertaken in the British population, which has examined similar to 2,000 individuals for each of 7 major diseases and a shared set of similar to 3,000 controls. Case-control comparisons identified 24 independent association signals at P < 5 X 10(-7): 1 in bipolar disorder, 1 in coronary artery disease, 9 in Crohn's disease, 3 in rheumatoid arthritis, 7 in type 1 diabetes and 3 in type 2 diabetes. On the basis of prior findings and replication studies thus-far completed, almost all of these signals reflect genuine susceptibility effects. We observed association at many previously identified loci, and found compelling evidence that some loci confer risk for more than one of the diseases studied. Across all diseases, we identified a large number of further signals ( including 58 loci with single-point P values between 10(-5) and 5 X 10(-7)) likely to yield additional susceptibility loci. The importance of appropriately large samples was confirmed by the modest effect sizes observed at most loci identified. This study thus represents a thorough validation of the GWA approach. It has also demonstrated that careful use of a shared control group represents a safe and effective approach to GWA analyses of multiple disease phenotypes; has generated a genome-wide genotype database for future studies of common diseases in the British population; and shown that, provided individuals with non-European ancestry are excluded, the extent of population stratification in the British population is generally modest. Our findings offer new avenues for exploring the pathophysiology of these important disorders. We anticipate that our data, results and software, which will be widely available to other investigators, will provide a powerful resource for human genetics research.

9,244 citations

Journal ArticleDOI
TL;DR: Microbial recognition by Toll-like receptors helps to direct adaptive immune responses to antigens derived from microbial pathogens to distinguish infectious nonself from noninfectious self.
Abstract: ▪ Abstract The innate immune system is a universal and ancient form of host defense against infection. Innate immune recognition relies on a limited number of germline-encoded receptors. These receptors evolved to recognize conserved products of microbial metabolism produced by microbial pathogens, but not by the host. Recognition of these molecular structures allows the immune system to distinguish infectious nonself from noninfectious self. Toll-like receptors play a major role in pathogen recognition and initiation of inflammatory and immune responses. Stimulation of Toll-like receptors by microbial products leads to the activation of signaling pathways that result in the induction of antimicrobial genes and inflammatory cytokines. In addition, stimulation of Toll-like receptors triggers dendritic cell maturation and results in the induction of costimulatory molecules and increased antigen-presenting capacity. Thus, microbial recognition by Toll-like receptors helps to direct adaptive immune responses ...

8,041 citations

Journal ArticleDOI
Stephan Ripke1, Stephan Ripke2, Benjamin M. Neale1, Benjamin M. Neale2  +351 moreInstitutions (102)
24 Jul 2014-Nature
TL;DR: Associations at DRD2 and several genes involved in glutamatergic neurotransmission highlight molecules of known and potential therapeutic relevance to schizophrenia, and are consistent with leading pathophysiological hypotheses.
Abstract: Schizophrenia is a highly heritable disorder. Genetic risk is conferred by a large number of alleles, including common alleles of small effect that might be detected by genome-wide association studies. Here we report a multi-stage schizophrenia genome-wide association study of up to 36,989 cases and 113,075 controls. We identify 128 independent associations spanning 108 conservatively defined loci that meet genome-wide significance, 83 of which have not been previously reported. Associations were enriched among genes expressed in brain, providing biological plausibility for the findings. Many findings have the potential to provide entirely new insights into aetiology, but associations at DRD2 and several genes involved in glutamatergic neurotransmission highlight molecules of known and potential therapeutic relevance to schizophrenia, and are consistent with leading pathophysiological hypotheses. Independent of genes expressed in brain, associations were enriched among genes expressed in tissues that have important roles in immunity, providing support for the speculated link between the immune system and schizophrenia.

6,809 citations

Journal ArticleDOI
John W. Belmont1, Paul Hardenbol, Thomas D. Willis, Fuli Yu1, Huanming Yang2, Lan Yang Ch'Ang, Wei Huang3, Bin Liu2, Yan Shen3, Paul K.H. Tam4, Lap-Chee Tsui4, Mary M.Y. Waye5, Jeffrey Tze Fei Wong6, Changqing Zeng2, Qingrun Zhang2, Mark S. Chee7, Luana Galver7, Semyon Kruglyak7, Sarah S. Murray7, Arnold Oliphant7, Alexandre Montpetit8, Fanny Chagnon8, Vincent Ferretti8, Martin Leboeuf8, Michael S. Phillips8, Andrei Verner8, Shenghui Duan9, Denise L. Lind10, Raymond D. Miller9, John P. Rice9, Nancy L. Saccone9, Patricia Taillon-Miller9, Ming Xiao10, Akihiro Sekine, Koki Sorimachi, Yoichi Tanaka, Tatsuhiko Tsunoda, Eiji Yoshino, David R. Bentley11, Sarah E. Hunt11, Don Powell11, Houcan Zhang12, Ichiro Matsuda13, Yoshimitsu Fukushima14, Darryl Macer15, Eiko Suda15, Charles N. Rotimi16, Clement Adebamowo17, Toyin Aniagwu17, Patricia A. Marshall18, Olayemi Matthew17, Chibuzor Nkwodimmah17, Charmaine D.M. Royal16, Mark Leppert19, Missy Dixon19, Fiona Cunningham20, Ardavan Kanani20, Gudmundur A. Thorisson20, Peter E. Chen21, David J. Cutler21, Carl S. Kashuk21, Peter Donnelly22, Jonathan Marchini22, Gilean McVean22, Simon Myers22, Lon R. Cardon22, Andrew P. Morris22, Bruce S. Weir23, James C. Mullikin24, Michael Feolo24, Mark J. Daly25, Renzong Qiu26, Alastair Kent, Georgia M. Dunston16, Kazuto Kato27, Norio Niikawa28, Jessica Watkin29, Richard A. Gibbs1, Erica Sodergren1, George M. Weinstock1, Richard K. Wilson9, Lucinda Fulton9, Jane Rogers11, Bruce W. Birren25, Hua Han2, Hongguang Wang, Martin Godbout30, John C. Wallenburg8, Paul L'Archevêque, Guy Bellemare, Kazuo Todani, Takashi Fujita, Satoshi Tanaka, Arthur L. Holden, Francis S. Collins24, Lisa D. Brooks24, Jean E. McEwen24, Mark S. Guyer24, Elke Jordan31, Jane Peterson24, Jack Spiegel24, Lawrence M. Sung32, Lynn F. Zacharia24, Karen Kennedy29, Michael Dunn29, Richard Seabrook29, Mark Shillito, Barbara Skene29, John Stewart29, David Valle21, Ellen Wright Clayton33, Lynn B. Jorde19, Aravinda Chakravarti21, Mildred K. Cho34, Troy Duster35, Troy Duster36, Morris W. Foster37, Maria Jasperse38, Bartha Maria Knoppers39, Pui-Yan Kwok10, Julio Licinio40, Jeffrey C. Long41, Pilar N. Ossorio42, Vivian Ota Wang33, Charles N. Rotimi16, Patricia Spallone43, Patricia Spallone29, Sharon F. Terry44, Eric S. Lander25, Eric H. Lai45, Deborah A. Nickerson46, Gonçalo R. Abecasis41, David Altshuler47, Michael Boehnke41, Panos Deloukas11, Julie A. Douglas41, Stacey Gabriel25, Richard R. Hudson48, Thomas J. Hudson8, Leonid Kruglyak49, Yusuke Nakamura50, Robert L. Nussbaum24, Stephen F. Schaffner25, Stephen T. Sherry24, Lincoln Stein20, Toshihiro Tanaka 
18 Dec 2003-Nature
TL;DR: The HapMap will allow the discovery of sequence variants that affect common disease, will facilitate development of diagnostic tools, and will enhance the ability to choose targets for therapeutic intervention.
Abstract: The goal of the International HapMap Project is to determine the common patterns of DNA sequence variation in the human genome and to make this information freely available in the public domain. An international consortium is developing a map of these patterns across the genome by determining the genotypes of one million or more sequence variants, their frequencies and the degree of association between them, in DNA samples from populations with ancestry from parts of Africa, Asia and Europe. The HapMap will allow the discovery of sequence variants that affect common disease, will facilitate development of diagnostic tools, and will enhance our ability to choose targets for therapeutic intervention.

5,926 citations

Journal ArticleDOI
TL;DR: This unit discusses mammalian Toll receptors (TLR1‐10) that have an essential role in the innate immune recognition of microorganisms and are discussed are TLR‐mediated signaling pathways and antibodies that are available to detect specific TLRs.
Abstract: The innate immune system in drosophila and mammals senses the invasion of microorganisms using the family of Toll receptors, stimulation of which initiates a range of host defense mechanisms. In drosophila antimicrobial responses rely on two signaling pathways: the Toll pathway and the IMD pathway. In mammals there are at least 10 members of the Toll-like receptor (TLR) family that recognize specific components conserved among microorganisms. Activation of the TLRs leads not only to the induction of inflammatory responses but also to the development of antigen-specific adaptive immunity. The TLR-induced inflammatory response is dependent on a common signaling pathway that is mediated by the adaptor molecule MyD88. However, there is evidence for additional pathways that mediate TLR ligand-specific biological responses.

5,915 citations