51
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Sverchkova A, Anzar I, Stratford R, Clancy T. Improved HLA typing of Class I and Class II alleles from next‐generation sequencing data. HLA 2019; 94:504-513. [DOI: 10.1111/tan.13685] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 08/27/2019] [Accepted: 09/04/2019] [Indexed: 12/12/2022]
Affiliation(s)
| | - Irantzu Anzar
- NEC OncoImmunity ASOslo Cancer Cluster, Innovation Park Oslo Norway
| | | | - Trevor Clancy
- NEC OncoImmunity ASOslo Cancer Cluster, Innovation Park Oslo Norway
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52
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Nudel R, Benros ME, Krebs MD, Allesøe RL, Lemvigh CK, Bybjerg-Grauholm J, Børglum AD, Daly MJ, Nordentoft M, Mors O, Hougaard DM, Mortensen PB, Buil A, Werge T, Rasmussen S, Thompson WK. Immunity and mental illness: findings from a Danish population-based immunogenetic study of seven psychiatric and neurodevelopmental disorders. Eur J Hum Genet 2019; 27:1445-1455. [PMID: 30976114 PMCID: PMC6777475 DOI: 10.1038/s41431-019-0402-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 03/11/2019] [Accepted: 03/19/2019] [Indexed: 01/11/2023] Open
Abstract
Human leukocyte antigen (HLA) genes encode proteins with important roles in the regulation of the immune system. Many studies have also implicated HLA genes in psychiatric and neurodevelopmental disorders. However, these studies usually focus on one disorder and/or on one HLA candidate gene, often with small samples. Here, we access a large dataset of 65,534 genotyped individuals consisting of controls (N = 19,645) and cases having one or more of autism spectrum disorder (N = 12,331), attention deficit hyperactivity disorder (N = 14,397), schizophrenia (N = 2401), bipolar disorder (N = 1391), depression (N = 18,511), anorexia (N = 2551) or intellectual disability (N = 3175). We imputed participants' HLA alleles to investigate the involvement of HLA genes in these disorders using regression models. We found a pronounced protective effect of DPB1*1501 on susceptibility to autism (p = 0.0094, OR = 0.72) and intellectual disability (p = 0.00099, OR = 0.41), with an increased protective effect on a comorbid diagnosis of both disorders (p = 0.003, OR = 0.29). We also identified a risk allele for intellectual disability, B*5701 (p = 0.00016, OR = 1.33). Associations with both alleles survived FDR correction and a permutation procedure. We did not find significant evidence for replication of previously-reported associations for autism or schizophrenia. Our results support an implication of HLA genes in autism and intellectual disability, which requires replication by other studies. Our study also highlights the importance of large sample sizes in HLA association studies.
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Affiliation(s)
- Ron Nudel
- Institute of Biological Psychiatry, Mental Health Centre Sct. Hans, Mental Health Services Copenhagen, Roskilde, Denmark
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark
| | - Michael E Benros
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark
- Mental Health Centre Copenhagen, University of Copenhagen Hospital, Copenhagen, Denmark
| | - Morten Dybdahl Krebs
- Institute of Biological Psychiatry, Mental Health Centre Sct. Hans, Mental Health Services Copenhagen, Roskilde, Denmark
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark
| | - Rosa Lundbye Allesøe
- Department of Bio and Health Informatics, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Camilla Koldbæk Lemvigh
- Department of Bio and Health Informatics, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Jonas Bybjerg-Grauholm
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark
- Center for Neonatal Screening, Department for Congenital Disorders, Statens Serum Institut, Copenhagen, Denmark
| | - Anders D Børglum
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark
- Department of Biomedicine, Aarhus University and Centre for Integrative Sequencing, iSEQ, Aarhus, Denmark
- Aarhus Genome Center, Aarhus, Denmark
| | - Mark J Daly
- Stanley Center for Psychiatric Research, Broad Institute of Harvard and MIT, Cambridge, MA, USA
| | - Merete Nordentoft
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark
- Mental Health Centre Copenhagen, University of Copenhagen Hospital, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Ole Mors
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark
- Psychosis Research Unit, Aarhus University Hospital, Risskov, Denmark
| | - David M Hougaard
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark
- Center for Neonatal Screening, Department for Congenital Disorders, Statens Serum Institut, Copenhagen, Denmark
| | - Preben Bo Mortensen
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark
- National Center for Register-Based Research, Aarhus University, Aarhus, Denmark
| | - Alfonso Buil
- Institute of Biological Psychiatry, Mental Health Centre Sct. Hans, Mental Health Services Copenhagen, Roskilde, Denmark
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark
| | - Thomas Werge
- Institute of Biological Psychiatry, Mental Health Centre Sct. Hans, Mental Health Services Copenhagen, Roskilde, Denmark
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Simon Rasmussen
- Department of Bio and Health Informatics, Technical University of Denmark, Kongens Lyngby, Denmark.
- Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
| | - Wesley K Thompson
- Institute of Biological Psychiatry, Mental Health Centre Sct. Hans, Mental Health Services Copenhagen, Roskilde, Denmark.
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, Copenhagen, Denmark.
- Department of Family Medicine and Public Health, Division of Biostatistics, University of California, San Diego, CA, USA.
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53
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Multiplicative fitness, rapid haplotype discovery, and fitness decay explain evolution of human MHC. Proc Natl Acad Sci U S A 2019; 116:14098-14104. [PMID: 31227609 DOI: 10.1073/pnas.1714436116] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The major histocompatibility complex (MHC) is a central component of the vertebrate immune system and hence evolves in the regime of a host-pathogen evolutionary race. The MHC is associated with quantitative traits which directly affect fitness and are subject to selection pressure. The evolution of haplotypes at the MHC HLA (HLA) locus is generally thought to be governed by selection for increased diversity that is manifested in overdominance and/or negative frequency-dependent selection (FDS). However, recently, a model combining purifying selection on haplotypes and balancing selection on alleles has been proposed. We compare the predictions of several population dynamics models of haplotype frequency evolution to the distributions derived from 6.59-million-donor HLA typings from the National Marrow Donor Program registry. We show that models that combine a multiplicative fitness function, extremely high haplotype discovery rates, and exponential fitness decay over time produce the best fit to the data for most of the analyzed populations. In contrast, overdominance is not supported, and population substructure does not explain the observed haplotype frequencies. Furthermore, there is no evidence of negative FDS. Thus, multiplicative fitness, rapid haplotype discovery, and rapid fitness decay appear to be the major factors shaping the HLA haplotype frequency distribution in the human population.
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54
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Chen M, Zoet Y, Roelen D, Martorell J, Middleton D, Slavcev A, Iniotaki A, Claas F, Fuggle S. Towards uniformity in the definition of acceptable mismatches for highly sensitized patients. HLA 2019; 94:147-153. [PMID: 31177642 PMCID: PMC6771471 DOI: 10.1111/tan.13607] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 05/16/2019] [Accepted: 06/05/2019] [Indexed: 12/04/2022]
Abstract
The Eurotransplant (The Eurotransplant International Foundation) acceptable mismatch programme has been shown to be a successful tool to enhance transplantation of highly sensitized patients(HSPs). However, patients with rare HLA phenotypes in relation to the Eurotransplant donor population remain on the waiting list. EUROSTAM is an European Union funded project to explore the feasibility of a Europe‐wide acceptable mismatch programme enabling transplantation of HSPs with rare HLA phenotypes within their own organ exchange organization. The present study, which forms part of the EUROSTAM project, assesses the differences in the practices of the laboratories in different countries with respect to their HLA antibody profiling and risk adverseness. In the serum exchange exercises of 18 samples, a high level of variability has been shown in both assays and interpretation of results. In the data exchange exercise when all participants were given the same Luminex raw data for analysis, a high degree of consensus was reached where the median fluorescent intensity values of beads were <500 and >2000 for standard single antigen bead assays, or <500 and >5000 for assignment of acceptable mismatches. The risk adverseness analysis has showed distinct patterns of attitudes towards the perceived risks based on HLA antibody assay results, most probably influenced by the local protocols of the clinical transplant programme of each laboratory. In order to ensure fairness and maintain consistencies of organ exchange among partner transplant centres, a centralized facility will be instrumental for a uniform definition of acceptable mismatches.
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Affiliation(s)
- Mian Chen
- Oxford Transplant Centre, Nuffield Department of Surgical Sciences, Oxford University Hospitals, Churchill Hospital, Oxford, UK
| | - Yvonne Zoet
- Eurotransplant Reference Laboratory, Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands
| | - Dave Roelen
- Department of Immunohematology and Blood transfusion, Leiden University Medical Center, Leiden, the Netherlands
| | | | - Derek Middleton
- Transplant Immunology Laboratory, Royal Liverpool and Broadgreen University Hospital, Liverpool, UK.,Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
| | - Antonij Slavcev
- Department of Immunogenetics, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - Aliki Iniotaki
- National Tissue Typing Center, General Hospital of Athens "G. Gennimatas", Athens, Greece
| | - Frans Claas
- Eurotransplant Reference Laboratory, Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands.,Department of Immunohematology and Blood transfusion, Leiden University Medical Center, Leiden, the Netherlands
| | - Susan Fuggle
- Oxford Transplant Centre, Nuffield Department of Surgical Sciences, Oxford University Hospitals, Churchill Hospital, Oxford, UK.,Organ Donation and Transplantation, NHS Blood and Transplant, Bristol, UK
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55
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Goeury T, Creary LE, Brunet L, Galan M, Pasquier M, Kervaire B, Langaney A, Tiercy JM, Fernández-Viña MA, Nunes JM, Sanchez-Mazas A. Deciphering the fine nucleotide diversity of full HLA class I and class II genes in a well-documented population from sub-Saharan Africa. HLA 2019; 91:36-51. [PMID: 29160618 PMCID: PMC5767763 DOI: 10.1111/tan.13180] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 11/01/2017] [Accepted: 11/15/2017] [Indexed: 01/06/2023]
Abstract
With the aim to understand how next‐generation sequencing (NGS) improves both our assessment of genetic variation within populations and our knowledge on HLA molecular evolution, we sequenced and analysed 8 HLA loci in a well‐documented population from sub‐Saharan Africa (Mandenka). The results of full‐gene NGS‐MiSeq sequencing compared with those obtained by traditional typing techniques or limited sequencing strategies showed that segregating sites located outside exon 2 are crucial to describe not only class I but also class II population diversity. A comprehensive analysis of exons 2, 3, 4 and 5 nucleotide diversity at the 8 HLA loci revealed remarkable differences among these gene regions, notably a greater variation concentrated in the antigen recognition sites of class I exons 3 and some class II exons 2, likely associated with their peptide‐presentation function, a lower diversity of HLA‐C exon 3, possibly related to its role as a KIR ligand, and a peculiar molecular diversity of HLA‐A exon 2, revealing demographic signals. Based on full‐length HLA sequences, we also propose that the most frequent DRB1 allele in the studied population, DRB1*13:04, emerged from an allelic conversion involving 3 potential alleles as donors and DRB1*11:02:01 as recipient. Finally, our analysis revealed a high occurrence of the DRB1*13:04‐DQA1*05:05:01‐DQB1*03:19 haplotype, possibly resulting from a selective sweep due to protection to Onchorcerca volvulus, a prevalent pathogen in West Africa. This study unveils highly relevant information on the molecular evolution of HLA genes in relation to their immune function, calling for similar analyses in other populations living in contrasting environments.
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Affiliation(s)
- T Goeury
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva, University of Geneva, Geneva, Switzerland
| | - L E Creary
- Department of Pathology, Stanford University School of Medicine, Palo Alto, California
| | - L Brunet
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland.,Transplantation Immunology Unit and National Reference Laboratory for Histocompatibility (UIT/LNRH), Geneva University Hospital, Geneva, Switzerland
| | - M Galan
- INRA, UMR 1062 CBGP, avenue du Campus Agropolis, Montferrier sur Lez, France
| | - M Pasquier
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva, University of Geneva, Geneva, Switzerland
| | - B Kervaire
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland.,Transplantation Immunology Unit and National Reference Laboratory for Histocompatibility (UIT/LNRH), Geneva University Hospital, Geneva, Switzerland
| | - A Langaney
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland
| | - J-M Tiercy
- Institute of Genetics and Genomics in Geneva, University of Geneva, Geneva, Switzerland.,Transplantation Immunology Unit and National Reference Laboratory for Histocompatibility (UIT/LNRH), Geneva University Hospital, Geneva, Switzerland
| | - M A Fernández-Viña
- Department of Pathology, Stanford University School of Medicine, Palo Alto, California
| | - J M Nunes
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva, University of Geneva, Geneva, Switzerland
| | - A Sanchez-Mazas
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva, University of Geneva, Geneva, Switzerland
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56
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Trejaut JA, Muyard F, Lai YH, Chen LR, Chen ZS, Loo JH, Huang JY, Lin M. Genetic diversity of the Thao people of Taiwan using Y-chromosome, mitochondrial DNA and HLA gene systems. BMC Evol Biol 2019; 19:64. [PMID: 30813905 PMCID: PMC6391829 DOI: 10.1186/s12862-019-1389-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Accepted: 02/13/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Despite attempts in retracing the history of the Thao people in Taiwan using folktales, linguistics, physical anthropology, and ethnic studies, their history remains incomplete. The heritage of Thao has been associated with the Pazeh Western plains peoples and several other mountain peoples of Taiwan. In the last 400 years, their culture and genetic profile have been reshaped by East Asian migrants. They were displaced by the Japanese and the construction of a dam and almost faced extinction. In this paper, genetic information from mitochondrial DNA (mtDNA), Histoleucocyte antigens (HLA), and the non-recombining Y chromosome of 30 Thao individuals are compared to 836 other Taiwan Mountain and Plains Aborigines (TwrIP & TwPp), 384 Non-Aboriginal Taiwanese (non-TwA) and 149 Continental East Asians. RESULTS The phylogeographic analyses of mtDNA haplogroups F4b and B4b1a2 indicated gene flow between Thao, Bunun, and Tsou, and suggested a common ancestry from 10,000 to 3000 years ago. A claim of close contact with the heavily Sinicized Pazeh of the plains was not rejected and suggests that the plains and mountain peoples most likely shared the same Austronesian agriculturist gene pool in the Neolithic. CONCLUSIONS Having been moving repeatedly since their arrival in Taiwan between 6000 and 4500 years ago, the Thao finally settled in the central mountain range. They represent the last plains people whose strong bonds with their original culture allowed them to preserve their genetic heritage, despite significant gene flow from the mainland of Asia. Representing a considerable contribution to the genealogical history of the Thao people, the findings of this study bear on ongoing anthropological and linguistic debates on their origin.
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Affiliation(s)
- Jean A Trejaut
- Molecular Anthropology and Transfusion Medicine Research Laboratory, Mackay Memorial Hospital, Taipei, Taiwan.
| | - Frank Muyard
- Department of French Studies, National Central University, Taoyuan Taiwan & French School of Asian Studies (EFEO), Taoyuan, Taiwan
| | - Ying-Hui Lai
- Molecular Anthropology and Transfusion Medicine Research Laboratory, Mackay Memorial Hospital, Taipei, Taiwan
| | - Lan-Rong Chen
- Molecular Anthropology and Transfusion Medicine Research Laboratory, Mackay Memorial Hospital, Taipei, Taiwan
| | - Zong-Sian Chen
- Molecular Anthropology and Transfusion Medicine Research Laboratory, Mackay Memorial Hospital, Taipei, Taiwan
| | - Jun-Hun Loo
- Molecular Anthropology and Transfusion Medicine Research Laboratory, Mackay Memorial Hospital, Taipei, Taiwan
| | - Jin-Yuan Huang
- Molecular Anthropology and Transfusion Medicine Research Laboratory, Mackay Memorial Hospital, Taipei, Taiwan
| | - Marie Lin
- Molecular Anthropology and Transfusion Medicine Research Laboratory, Mackay Memorial Hospital, Taipei, Taiwan.
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57
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Sanchez-Mazas A, Nunes JM. Does NGS typing highlight our understanding of HLA population diversity? Hum Immunol 2019; 80:62-66. [DOI: 10.1016/j.humimm.2018.10.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/08/2018] [Accepted: 10/09/2018] [Indexed: 01/08/2023]
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58
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Świderská Z, Šmídová A, Buchtová L, Bryjová A, Fabiánová A, Munclinger P, Vinkler M. Avian Toll-like receptor allelic diversity far exceeds human polymorphism: an insight from domestic chicken breeds. Sci Rep 2018; 8:17878. [PMID: 30552359 PMCID: PMC6294777 DOI: 10.1038/s41598-018-36226-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 11/14/2018] [Indexed: 02/07/2023] Open
Abstract
Immune genes show remarkable levels of adaptive variation shaped by pathogen-mediated selection. Compared to humans, however, population polymorphism in animals has been understudied. To provide an insight into immunogenetic diversity in birds, we sequenced complete protein-coding regions of all Toll-like receptor (TLR) genes with direct orthology between mammals and birds (TLR3, TLR4, TLR5 and TLR7) in 110 domestic chickens from 25 breeds and compared their variability with a corresponding human dataset. Chicken TLRs (chTLRs) exhibit on average nine-times higher nucleotide diversity than human TLRs (hTLRs). Increased potentially functional non-synonymous variability is found in chTLR ligand-binding ectodomains. While we identified seven sites in chTLRs under positive selection and found evidence for convergence between alleles, no selection or convergence was detected in hTLRs. Up to six-times more alleles were identified in fowl (70 chTLR4 alleles vs. 11 hTLR4 alleles). In chTLRs, high numbers of alleles are shared between the breeds and the allelic frequencies are more equal than in hTLRs. These differences may have an important impact on infectious disease resistance and host-parasite co-evolution. Though adaptation through high genetic variation is typical for acquired immunity (e.g. MHC), our results show striking levels of intraspecific polymorphism also in poultry innate immune receptors.
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Grants
- 504214 Grantová Agentura, Univerzita Karlova (Charles University Grant Agency)
- 504214 Grantová Agentura, Univerzita Karlova (Charles University Grant Agency)
- 204069 Univerzita Karlova v Praze (Charles University)
- 204069 Univerzita Karlova v Praze (Charles University)
- PRIMUS/17/SCI/12 Univerzita Karlova v Praze (Charles University)
- SVV 260434/2018 Ministerstvo Školství, Mládeže a Tělovýchovy (Ministry of Education, Youth and Sports)
- INTER-COST LTC18060 Ministerstvo Školství, Mládeže a Tělovýchovy (Ministry of Education, Youth and Sports)
- SVV 260434/2018 Ministerstvo Školství, Mládeže a Tělovýchovy (Ministry of Education, Youth and Sports)
- P502/12/P179 Grantová Agentura České Republiky (Grant Agency of the Czech Republic)
- Grantov&#x00E1; Agentura, Univerzita Karlova (Charles University Grant Agency)
- Ministerstvo &#x0160;kolstv&#x00ED;, Ml&#x00E1;de&#x017E;e a T&#x011B;lov&#x00FD;chovy (Ministry of Education, Youth and Sports)
- Grantov&#x00E1; Agentura &#x010C;esk&#x00E9; Republiky (Grant Agency of the Czech Republic)
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Affiliation(s)
- Zuzana Świderská
- Charles University, Faculty of Science, Department of Zoology, Viničná 7, Prague, 12843, Czech Republic
- Charles University, Faculty of Science, Department of Cell Biology, Viničná 7, Prague, 12843, Czech Republic
| | - Adéla Šmídová
- Charles University, Faculty of Science, Department of Zoology, Viničná 7, Prague, 12843, Czech Republic
| | - Lucie Buchtová
- Charles University, Faculty of Science, Department of Zoology, Viničná 7, Prague, 12843, Czech Republic
| | - Anna Bryjová
- Charles University, Faculty of Science, Department of Zoology, Viničná 7, Prague, 12843, Czech Republic
- The Czech Academy of Sciences, Institute of Vertebrate Biology, v.v.i., Květná 8, Brno, 60365, Czech Republic
| | - Anežka Fabiánová
- Charles University, Faculty of Science, Department of Zoology, Viničná 7, Prague, 12843, Czech Republic
| | - Pavel Munclinger
- Charles University, Faculty of Science, Department of Zoology, Viničná 7, Prague, 12843, Czech Republic
| | - Michal Vinkler
- Charles University, Faculty of Science, Department of Zoology, Viničná 7, Prague, 12843, Czech Republic.
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59
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Nyaga DM, Vickers MH, Jefferies C, Perry JK, O'Sullivan JM. The genetic architecture of type 1 diabetes mellitus. Mol Cell Endocrinol 2018; 477:70-80. [PMID: 29913182 DOI: 10.1016/j.mce.2018.06.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 05/14/2018] [Accepted: 06/06/2018] [Indexed: 02/07/2023]
Abstract
Type 1 diabetes mellitus (T1D) is a complex autoimmune disorder characterised by loss of the insulin-producing pancreatic beta cells in genetically predisposed individuals, ultimately resulting in insulin deficiency and hyperglycaemia. T1D is most common among children and young adults, and the incidence is on the rise across the world. The aetiology of T1D is hypothesized to involve genetic and environmental factors that result in the T-cell mediated destruction of pancreatic beta cells. There is a strong genetic risk to T1D; with genome-wide association studies (GWAS) identifying over 60 susceptibility regions within the human genome which are marked by single nucleotide polymorphisms (SNPs). Here, we review what is currently known about the genetics of T1D. We argue that advancing our understanding of the aetiology and pathogenesis of T1D will require the integration of genome biology (omics-data) with GWAS data, thereby making it possible to elucidate the putative gene regulatory networks modulated by disease-associated SNPs. This approach has a potential to revolutionize clinical management of T1D in an era of precision medicine.
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Affiliation(s)
- Denis M Nyaga
- The Liggins Institute, The University of Auckland, New Zealand
| | - Mark H Vickers
- The Liggins Institute, The University of Auckland, New Zealand
| | - Craig Jefferies
- The Liggins Institute, The University of Auckland, New Zealand; Starship Children's Health, Auckland, New Zealand
| | - Jo K Perry
- The Liggins Institute, The University of Auckland, New Zealand
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60
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Ferreiro-Iglesias A, Lesseur C, McKay J, Hung RJ, Han Y, Zong X, Christiani D, Johansson M, Xiao X, Li Y, Qian DC, Ji X, Liu G, Caporaso N, Scelo G, Zaridze D, Mukeriya A, Kontic M, Ognjanovic S, Lissowska J, Szołkowska M, Swiatkowska B, Janout V, Holcatova I, Bolca C, Savic M, Ognjanovic M, Bojesen SE, Wu X, Albanes D, Aldrich MC, Tardon A, Fernandez-Somoano A, Fernandez-Tardon G, Le Marchand L, Rennert G, Chen C, Doherty J, Goodman G, Bickeböller H, Wichmann HE, Risch A, Rosenberger A, Shen H, Dai J, Field JK, Davies M, Woll P, Teare MD, Kiemeney LA, van der Heijden EHFM, Yuan JM, Hong YC, Haugen A, Zienolddiny S, Lam S, Tsao MS, Johansson M, Grankvist K, Schabath MB, Andrew A, Duell E, Melander O, Brunnström H, Lazarus P, Arnold S, Slone S, Byun J, Kamal A, Zhu D, Landi MT, Amos CI, Brennan P. Fine mapping of MHC region in lung cancer highlights independent susceptibility loci by ethnicity. Nat Commun 2018; 9:3927. [PMID: 30254314 PMCID: PMC6156406 DOI: 10.1038/s41467-018-05890-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 07/30/2018] [Indexed: 12/19/2022] Open
Abstract
The basis for associations between lung cancer and major histocompatibility complex genes is not completely understood. Here the authors further consider genetic variation within the MHC region in lung cancer patients and identify independent associations within HLA genes that explain MHC lung cancer associations in Europeans and Asian populations. Lung cancer has several genetic associations identified within the major histocompatibility complex (MHC); although the basis for these associations remains elusive. Here, we analyze MHC genetic variation among 26,044 lung cancer patients and 20,836 controls densely genotyped across the MHC, using the Illumina Illumina OncoArray or Illumina 660W SNP microarray. We impute sequence variation in classical HLA genes, fine-map MHC associations for lung cancer risk with major histologies and compare results between ethnicities. Independent and novel associations within HLA genes are identified in Europeans including amino acids in the HLA-B*0801 peptide binding groove and an independent HLA-DQB1*06 loci group. In Asians, associations are driven by two independent HLA allele sets that both increase risk in HLA-DQB1*0401 and HLA-DRB1*0701; the latter better represented by the amino acid Ala-104. These results implicate several HLA–tumor peptide interactions as the major MHC factor modulating lung cancer susceptibility.
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Affiliation(s)
- Aida Ferreiro-Iglesias
- International Agency for Research on Cancer, World Health Organization, Lyon, 69372 cedex 08, France
| | - Corina Lesseur
- International Agency for Research on Cancer, World Health Organization, Lyon, 69372 cedex 08, France
| | - James McKay
- International Agency for Research on Cancer, World Health Organization, Lyon, 69372 cedex 08, France
| | - Rayjean J Hung
- Lunenfeld-Tanenbaum Research Institute of Sinai Health System, University of Toronto, Toronto, M5G 1X5, Canada
| | - Younghun Han
- Biomedical Data Science, Geisel School of Medicine at Dartmouth, Hanover, 03755, NH, USA
| | - Xuchen Zong
- Lunenfeld-Tanenbaum Research Institute of Sinai Health System, University of Toronto, Toronto, M5G 1X5, Canada
| | - David Christiani
- Department of Environmental Health, Harvard TH Chan School of Public Health, Massachusetts General Hospital/ Harvard Medical School, Boston, 02115, MA, USA
| | - Mattias Johansson
- International Agency for Research on Cancer, World Health Organization, Lyon, 69372 cedex 08, France
| | - Xiangjun Xiao
- Biomedical Data Science, Geisel School of Medicine at Dartmouth, Hanover, 03755, NH, USA
| | - Yafang Li
- Biomedical Data Science, Geisel School of Medicine at Dartmouth, Hanover, 03755, NH, USA
| | - David C Qian
- Biomedical Data Science, Geisel School of Medicine at Dartmouth, Hanover, 03755, NH, USA
| | - Xuemei Ji
- Biomedical Data Science, Geisel School of Medicine at Dartmouth, Hanover, 03755, NH, USA
| | - Geoffrey Liu
- Lunenfeld-Tanenbaum Research Institute of Sinai Health System, University of Toronto, Toronto, M5G 1X5, Canada
| | - Neil Caporaso
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, 20892-9768, MD, USA
| | - Ghislaine Scelo
- International Agency for Research on Cancer, World Health Organization, Lyon, 69372 cedex 08, France
| | - David Zaridze
- Russian N.N. Blokhin Cancer Research Centre, Moscow, 115478, Russian Federation
| | - Anush Mukeriya
- Russian N.N. Blokhin Cancer Research Centre, Moscow, 115478, Russian Federation
| | | | - Simona Ognjanovic
- International Organization for Cancer Prevention and Research, Belgrade, 11070, Serbia
| | - Jolanta Lissowska
- M. Sklodowska-Curie Cancer Center, Institute of Oncology, Warsaw, 02-034, Poland
| | - Małgorzata Szołkowska
- Department of Pathology, National Tuberculosis and Lung Diseases Research Institute, Warsaw, 01-138, Poland
| | - Beata Swiatkowska
- Department of Environmental Epidemiology, Nofer Institute of Occupational Medicine, Lodz, 91-348, Poland
| | - Vladimir Janout
- Faculty of Medicine, University of Olomouc, Olomouc, 701 03, Czech Republic
| | - Ivana Holcatova
- 2nd Faculty of Medicine, Institute of Public Health and Preventive Medicine, Charles University, Prague, CZ 128 00, Czech Republic
| | - Ciprian Bolca
- Institute of Pneumology "Marius Nasta", Bucharest, RO-050159, Romania
| | - Milan Savic
- Department of Thoracic Surgery Clinical Center of Serbia Belgrade, Belgrade, 11000, Serbia
| | - Miodrag Ognjanovic
- International Organization for Cancer Prevention and Research, Belgrade, 11070, Serbia
| | - Stig Egil Bojesen
- Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen, 2730, Denmark.,Department of Clinical Biochemistry, Herlev and Gentofte Hospital, Copenhagen University Hospital, Copenhagen, 2730, Denmark.,Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, 2730, Denmark
| | - Xifeng Wu
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, 77030, TX, USA
| | - Demetrios Albanes
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, 20892-9768, MD, USA
| | - Melinda C Aldrich
- Department of Thoracic Surgery, Division of Epidemiology, Vanderbilt University Medical Center, Nashville, 37232-4682, TA, USA
| | - Adonina Tardon
- University of Oviedo and CIBERESP, Faculty of Medicine, Oviedo, 33006, Spain
| | | | | | - Loic Le Marchand
- Epidemiology Program, University of Hawaii Cancer Center, Honolulu, 96813, HI, USA
| | - Gadi Rennert
- Clalit National Cancer Control Center at Carmel Medical Center and Technion Faculty of Medicine, Haifa, 3525433, Israel
| | - Chu Chen
- Department of Epidemiology, University of Washington School of Public Health and Community Medicine, Seattle, 98195, WA, USA
| | - Jennifer Doherty
- Department of Epidemiology, University of Washington School of Public Health and Community Medicine, Seattle, 98195, WA, USA.,Fred Hutchinson Cancer Research Center, Seattle, 98109, WA, USA
| | | | - Heike Bickeböller
- Department of Genetic Epidemiology, University Medical Center, Georg-August-University Göttingen, Göttingen, 37073, Germany
| | - H-Erich Wichmann
- Institute of Medical Informatics, Biometry and Epidemiology, Chair of Epidemiology, Ludwig Maximilians University, Munich, D-85764, Germany.,Helmholtz Center Munich, Institute of Epidemiology 2, Munich, D-85764, Germany.,Institute of Medical Statistics and Epidemiology, Technical University Munich, Munich, D-80333, Germany
| | - Angela Risch
- University of Salzburg and Cancer Cluster Salzburg, Salzburg, 5020, Austria.,Translational Lung Research Center Heidelberg (TLRC-H), Heidelberg, 69120, Germany.,German Center for Lung Research (DZL), Heidelberg, 69121, Germany
| | - Albert Rosenberger
- Department of Genetic Epidemiology, University Medical Center, Georg-August-University Göttingen, Göttingen, 37073, Germany
| | - Hongbing Shen
- Department of Epidemiology and Biostatistics, Jiangsu Collaborative Innovation Center for Cancer Medicine, School of Public Health, Nanjing Medical University, Nanjing, 211166, China
| | - Juncheng Dai
- Department of Epidemiology and Biostatistics, Jiangsu Collaborative Innovation Center for Cancer Medicine, School of Public Health, Nanjing Medical University, Nanjing, 211166, China
| | - John K Field
- Institute of Translational Medicine, University of Liverpool, Liverpool, L3 9TA, UK
| | - Michael Davies
- Institute of Translational Medicine, University of Liverpool, Liverpool, L3 9TA, UK
| | - Penella Woll
- Department of Oncology, University of Sheffield, Sheffield, S10 2RX, UK
| | - M Dawn Teare
- School of Health and Related Research, University Of Sheffield, England, S1 4DA, UK
| | | | | | - Jian-Min Yuan
- University of Pittsburgh Cancer Institute, Pittsburgh, 15232, PA, USA
| | - Yun-Chul Hong
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - Aage Haugen
- National Institute of Occupational Health, Oslo, N-0033, Norway
| | | | - Stephen Lam
- British Columbia Cancer Agency, Vancouver, V5Z 1M9, Canada
| | - Ming-Sound Tsao
- Princess Margaret Cancer Centre, Toronto, ON M5G 1L7, Canada
| | - Mikael Johansson
- Department of Radiation Sciences, Umeå University, Umeå, 901 85, Sweden
| | - Kjell Grankvist
- Department of Medical Biosciences, Umeå University, Umeå, 901 85, Sweden
| | - Matthew B Schabath
- Department of Cancer Epidemiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, 33612, FL, USA
| | - Angeline Andrew
- Biomedical Data Science, Geisel School of Medicine at Dartmouth, Hanover, 03755, NH, USA
| | - Eric Duell
- Unit of Nutrition and Cancer, Catalan Institute of Oncology (ICO-IDIBELL), Barcelona, 08908, Spain
| | - Olle Melander
- Department of Clinical Sciences Malmö, Lund University, Malmö, 221 00, Sweden.,Department of Internal Medicine, Skåne University Hospital, Malmö, Sweden
| | - Hans Brunnström
- Laboratory Medicine Region Skåne, Department of Clinical Sciences Lund, Pathology, Lund University, Lund, 221 00, Sweden
| | - Philip Lazarus
- Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Spokane, 99202, WA, USA
| | - Susanne Arnold
- University of Kentucky, Markey Cancer Center, Lexington, 40536-0098, KY, USA
| | - Stacey Slone
- University of Kentucky, Markey Cancer Center, Lexington, 40536-0098, KY, USA
| | - Jinyoung Byun
- Biomedical Data Science, Geisel School of Medicine at Dartmouth, Hanover, 03755, NH, USA
| | - Ahsan Kamal
- Biomedical Data Science, Geisel School of Medicine at Dartmouth, Hanover, 03755, NH, USA
| | - Dakai Zhu
- Biomedical Data Science, Geisel School of Medicine at Dartmouth, Hanover, 03755, NH, USA
| | - Maria Teresa Landi
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, 20892-9768, MD, USA
| | - Christopher I Amos
- Biomedical Data Science, Geisel School of Medicine at Dartmouth, Hanover, 03755, NH, USA
| | - Paul Brennan
- International Agency for Research on Cancer, World Health Organization, Lyon, 69372 cedex 08, France.
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Human Leukocyte Antigen-A, B, C, DRB1, and DQB1 Allele and Haplotype Frequencies in a Subset of 237 Donors in the South African Bone Marrow Registry. J Immunol Res 2018; 2018:2031571. [PMID: 29850621 PMCID: PMC5937380 DOI: 10.1155/2018/2031571] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 01/30/2018] [Accepted: 04/11/2018] [Indexed: 12/31/2022] Open
Abstract
Human leukocyte antigen- (HLA-) A, HLA-B, HLA-C, HLA-DRB1, and HLA-DQB1 allele and haplotype frequencies were studied in a subset of 237 volunteer bone marrow donors registered at the South African Bone Marrow Registry (SABMR). Hapl-o-Mat software was used to compute allele and haplotype frequencies from individuals typed at various resolutions, with some alleles in multiple allele code (MAC) format. Four hundred and thirty-eight HLA-A, 235 HLA-B, 234 HLA-DRB1, 41 HLA-DQB1, and 29 HLA-C alleles are reported. The most frequent alleles were A∗02:02g (0.096), B∗07:02g (0.082), C∗07:02g (0.180), DQB1∗06:02 (0.157), and DRB1∗15:01 (0.072). The most common haplotype was A∗03:01g~B∗07:02g~C∗07:02g~DQB1∗06:02~DRB1∗15:01 (0.067), which has also been reported in other populations. Deviations from Hardy-Weinberg equilibrium were observed in A, B, and DRB1 loci, with C~DQB1 being the only locus pair in linkage disequilibrium. This study describes allele and haplotype frequencies from a subset of donors registered at SABMR, the only active bone marrow donor registry in Africa. Although the sample size was small, our results form a key resource for future population studies, disease association studies, and donor recruitment strategies.
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Hamed CT, Meiloud G, Veten F, Hadrami M, Ghaber SM, Boussaty EC, Habti N, Houmeida A. HLA class I (-A, -B, -C) and class II (-DR, -DQ) polymorphism in the Mauritanian population. BMC MEDICAL GENETICS 2018; 19:2. [PMID: 29298671 PMCID: PMC5751816 DOI: 10.1186/s12881-017-0514-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 12/19/2017] [Indexed: 11/10/2022]
Abstract
BACKGROUND HLA antigens have been widely studied for their role in transplantation biology, human diseases and population diversity. The aim of this study was to provide the first profile of HLA class I and class II alleles in the Mauritanian population. METHODS HLA typing was carried in 93 healthy Mauritanian blood donors, using single specific primer amplification (PCR-SSP). RESULTS Occurrences of the main HLA class I (-A, -B, -C) and class II (-DR, -DQ) antigens in the general population showed that out of the 17 HLA-A allele groups detected, five main HLA-A allele groups: A*02 (18.42%), A*01 (14.04%), A*23 (14.04%), A*30 (13.16%) and A*29 (12.28%) were the most common identified along other 12 relatively minor allele groups. Twenty three allele groups were observed in the locus B of which B*07 (13.46%) was the most prevalent followed by B*15, B*35, B*08 and B*27 all, with a frequency between 7 to 8%. Three prevalent HLA-C allele groups (C*02: 35.09%, C*07: 20.19% and C*06: 13.6%) were detected. The main HLA class II observed allele groups were: DRB1*13 (27.42%), DRB1*03 (24.73%), DRB1*11 (13.98%), DQB1*03 (36.03%), DQB1*02 (22.06%) and DQB1*05 (18.8%). Except for few haplotype in class I (A*02-B*07: 4.45%, A*02-C02: 10%, A*23-C*02: 8.8%, B*07-C*02: 8.8%, B*15-C*02: 8.8%) and in class II (DRB1*13-DQB1*06: 11.94%, DRB1*03-DQB1*02:11.19% and DRB1*03-DQB1*03: 10.45%), the majority of locus combination were in the range of 2-3%. A single predominant haplotype C*02-DRB1*03 (16.67%) was found. CONCLUSIONS These results, in agreement with previous data using different tissues markers, underlined the ethnic heterogeneity of the Mauritanian population.
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Affiliation(s)
- Cheikh Tijani Hamed
- Unité de Recherche sur les Biomarqueurs dans la Population Mauritanienne, Université des Sciences de Technologies et de médecine (USTM), Nouakchott, Mauritanie.,Centre National de Transfusion Sanguine, Nouakchott, Mauritanie
| | - Ghlana Meiloud
- Unité de Recherche sur les Biomarqueurs dans la Population Mauritanienne, Université des Sciences de Technologies et de médecine (USTM), Nouakchott, Mauritanie
| | - Fatimetou Veten
- Unité de Recherche sur les Biomarqueurs dans la Population Mauritanienne, Université des Sciences de Technologies et de médecine (USTM), Nouakchott, Mauritanie
| | - Mouna Hadrami
- Unité de Recherche sur les Biomarqueurs dans la Population Mauritanienne, Université des Sciences de Technologies et de médecine (USTM), Nouakchott, Mauritanie
| | - Sidi M Ghaber
- Laboratoire d'hématologie Faculté de Médecine, Université des Sciences de Technologies et de médecine (USTM), Nouakchott, Mauritanie
| | - Ely C Boussaty
- Unité de Recherche sur les Biomarqueurs dans la Population Mauritanienne, Université des Sciences de Technologies et de médecine (USTM), Nouakchott, Mauritanie
| | - Norddine Habti
- Laboratoire d'hématologie et de génie génétique et cellulaire, Faculté de Médecine et de Pharmacie de Casablanca, Université HASSAN II-Ain Chock, Casablanca, Maroc
| | - Ahmed Houmeida
- Unité de Recherche sur les Biomarqueurs dans la Population Mauritanienne, Université des Sciences de Technologies et de médecine (USTM), Nouakchott, Mauritanie.
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Turner TR, Hayhurst JD, Hayward DR, Bultitude WP, Barker DJ, Robinson J, Madrigal JA, Mayor NP, Marsh SGE. Single molecule real-time DNA sequencing of HLA genes at ultra-high resolution from 126 International HLA and Immunogenetics Workshop cell lines. HLA 2017; 91:88-101. [PMID: 29171935 DOI: 10.1111/tan.13184] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 11/01/2017] [Accepted: 11/20/2017] [Indexed: 01/10/2023]
Abstract
The hyperpolymorphic HLA genes play important roles in disease and transplantation and act as genetic markers of migration and evolution. A panel of 107 B-lymphoblastoid cell lines (B-LCLs) was established in 1987 at the 10th International Histocompatibility Workshop as a resource for the immunogenetics community. These B-LCLs are well characterised and represent diverse ethnicities and HLA haplotypes. Here we have applied Pacific Biosciences' Single Molecule Real-Time (SMRT) DNA sequencing to HLA type 126 B-LCL, including the 107 International HLA and Immunogenetics Workshop (IHIW) cells, to ultra-high resolution. Amplicon sequencing of full-length HLA class I genes (HLA-A, -B and -C) and partial length HLA class II genes (HLA-DRB1, -DQB1 and -DPB1) was performed. We typed a total of 931 HLA alleles, 895 (96%) of which were consistent with the typing in the IPD-IMGT/HLA Database (Release 3.27.0, January 20, 2017), with 595 (64%) typed at a higher resolution. Discrepant types, including novel alleles (n = 10) and changes in zygosity (n = 13), as well as previously unreported types (n = 34) were observed. In addition, patterns of linkage disequilibrium were distinguished by four-field resolution typing of HLA-B and HLA-C. By improving and standardising the HLA typing of these B-LCLs, we have ensured their continued usefulness as a resource for the immunogenetics community in the age of next generation DNA sequencing.
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Affiliation(s)
- T R Turner
- Anthony Nolan Research Institute, Royal Free Hospital, London, UK.,UCL Cancer Institute, Royal Free Campus, London, UK
| | - J D Hayhurst
- Anthony Nolan Research Institute, Royal Free Hospital, London, UK
| | - D R Hayward
- Anthony Nolan Research Institute, Royal Free Hospital, London, UK
| | - W P Bultitude
- Anthony Nolan Research Institute, Royal Free Hospital, London, UK.,UCL Cancer Institute, Royal Free Campus, London, UK
| | - D J Barker
- Anthony Nolan Research Institute, Royal Free Hospital, London, UK
| | - J Robinson
- Anthony Nolan Research Institute, Royal Free Hospital, London, UK.,UCL Cancer Institute, Royal Free Campus, London, UK
| | - J A Madrigal
- Anthony Nolan Research Institute, Royal Free Hospital, London, UK.,UCL Cancer Institute, Royal Free Campus, London, UK
| | - N P Mayor
- Anthony Nolan Research Institute, Royal Free Hospital, London, UK.,UCL Cancer Institute, Royal Free Campus, London, UK
| | - S G E Marsh
- Anthony Nolan Research Institute, Royal Free Hospital, London, UK.,UCL Cancer Institute, Royal Free Campus, London, UK
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Kirijas M, Genadieva Stavrik S, Senev A, Efinska Mladenovska O, Petlichkovski A. HLA-A, -B, -C and -DRB1 allele and haplotype frequencies in the Macedonian population based on a family study. Hum Immunol 2017; 79:145-153. [PMID: 29225116 DOI: 10.1016/j.humimm.2017.12.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 11/07/2017] [Accepted: 12/02/2017] [Indexed: 11/29/2022]
Abstract
AIM The aim of this study was to determine HLA allele and 2-, 3- and 4-loci haplotype frequencies in a sample from Macedonian population with defined haplotypes based on family history. MATERIAL AND METHODS We analysed 286 unrelated individuals with Macedonian origin, parents of patients who needed stem cell transplantation, in the period of 01.01.2003 till 31.12.2016. Allele and haplotype frequencies, as well as Hardy-Weinberg equilibrium were calculated using the Arlequin3.5 software. Population comparison was calculated using the PHYLIP software. RESULTS We identified 18 HLA-A, 26 HLA-B, 13 HLA-C and 13 HLA-DRB1 allele group families. The most frequent allele groups in our population were HLA-A*02 (29.0%), HLA-A*24 (13.8%), HLA-B*35 (16.1%), HLA-B*51 (14.7%), HLA-B*18 (14.7%), HLA-C*07 (27.9%), HLA-DRB1*11 (25.5%) and HLA-DRB1*16 (14.8%). The most frequent four loci haplotype was HLA-A*01-B*08-C*07-DRB1*03 (2.7%). Our comparison showed that the Macedonian population is closely related to the neighbouring countries in the Balkan Peninsula. CONCLUSION This study provides data about the HLA diversity in the Macedonian population, which can be very important in the process of unrelated donor search, and in addition yields control group for future disease association studies in our population.
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Affiliation(s)
- Meri Kirijas
- Institute for Immunobiology and Human Genetics, Medical Faculty, Skopje, Macedonia.
| | - Sonja Genadieva Stavrik
- Bone Marrow Transplantation Unit, University Hematology Clinic, Medical Faculty, Skopje, Macedonia
| | - Aleksandar Senev
- Institute for Immunobiology and Human Genetics, Medical Faculty, Skopje, Macedonia
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Sanchez-Mazas A, Černý V, Di D, Buhler S, Podgorná E, Chevallier E, Brunet L, Weber S, Kervaire B, Testi M, Andreani M, Tiercy JM, Villard J, Nunes JM. The HLA-B landscape of Africa: Signatures of pathogen-driven selection and molecular identification of candidate alleles to malaria protection. Mol Ecol 2017; 26:6238-6252. [PMID: 28950417 DOI: 10.1111/mec.14366] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 09/11/2017] [Indexed: 11/30/2022]
Abstract
Human leukocyte antigen (HLA) genes play a key role in the immune response to infectious diseases, some of which are highly prevalent in specific environments, like malaria in sub-Saharan Africa. Former case-control studies showed that one particular HLA-B allele, B*53, was associated with malaria protection in Gambia, but this hypothesis was not tested so far within a population genetics framework. In this study, our objective was to assess whether pathogen-driven selection associated with malaria contributed to shape the HLA-B genetic landscape of Africa. To that aim, we first typed the HLA-A and -B loci in 484 individuals from 11 populations living in different environments across the Sahel, and we analysed these data together with those available for 29 other populations using several approaches including linear modelling on various genetic, geographic and environmental parameters. In addition to relevant signatures of populations' demography and migrations history in the genetic differentiation patterns of both HLA-A and -B loci, we found that the frequencies of three HLA alleles, B*53, B*78 and A*74, were significantly associated with Plasmodium falciparum malaria prevalence, suggesting their increase through pathogen-driven selection in malaria-endemic environments. The two HLA-B alleles were further identified, by high-throughput sequencing, as B*53:01:01 (in putative linkage disequilibrium with one HLA-C allele, C*04:01:01:01) and B*78:01 in all but one individuals tested, making them appropriate candidates to malaria protection. These results highlight the role of environmental factors in the evolution of the HLA polymorphism and open key perspectives for functional studies focusing on HLA peptide-binding properties.
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Affiliation(s)
- Alicia Sanchez-Mazas
- Department of Genetics and Evolution - Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling History (AGP), University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva (IGE3), Geneva, Switzerland
| | - Viktor Černý
- Department of Anthropology and Human Genetics, Faculty of Science, Charles University, Prague, Czech Republic
| | - Da Di
- Department of Genetics and Evolution - Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling History (AGP), University of Geneva, Geneva, Switzerland
| | - Stéphane Buhler
- Department of Genetics and Evolution - Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling History (AGP), University of Geneva, Geneva, Switzerland.,Department of Genetic and Laboratory Medicine, Transplantation Immunology Unit and National Reference Laboratory for Histocompatibility (UIT/LNRH), Geneva University Hospitals, Geneva, Switzerland
| | - Eliška Podgorná
- Department of the Archaeology of Landscape and Archaeobiology, Archaeogenetics Laboratory, Institute of Archaeology of the Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Elodie Chevallier
- Department of Genetics and Evolution - Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling History (AGP), University of Geneva, Geneva, Switzerland
| | - Lydie Brunet
- Department of Genetics and Evolution - Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling History (AGP), University of Geneva, Geneva, Switzerland.,Department of Genetic and Laboratory Medicine, Transplantation Immunology Unit and National Reference Laboratory for Histocompatibility (UIT/LNRH), Geneva University Hospitals, Geneva, Switzerland
| | - Stephan Weber
- Department of Genetics and Evolution - Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling History (AGP), University of Geneva, Geneva, Switzerland
| | - Barbara Kervaire
- Department of Genetic and Laboratory Medicine, Transplantation Immunology Unit and National Reference Laboratory for Histocompatibility (UIT/LNRH), Geneva University Hospitals, Geneva, Switzerland
| | - Manuela Testi
- Laboratory of Immunogenetics and Transplant Biology, IME Foundation, Policlinic of the University of Tor Vergata, Rome, Italy
| | - Marco Andreani
- Laboratory of Immunogenetics and Transplant Biology, IME Foundation, Policlinic of the University of Tor Vergata, Rome, Italy
| | - Jean-Marie Tiercy
- Institute of Genetics and Genomics in Geneva (IGE3), Geneva, Switzerland.,Department of Genetic and Laboratory Medicine, Transplantation Immunology Unit and National Reference Laboratory for Histocompatibility (UIT/LNRH), Geneva University Hospitals, Geneva, Switzerland
| | - Jean Villard
- Institute of Genetics and Genomics in Geneva (IGE3), Geneva, Switzerland.,Department of Genetic and Laboratory Medicine, Transplantation Immunology Unit and National Reference Laboratory for Histocompatibility (UIT/LNRH), Geneva University Hospitals, Geneva, Switzerland
| | - José Manuel Nunes
- Department of Genetics and Evolution - Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling History (AGP), University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva (IGE3), Geneva, Switzerland
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Hadadianpour A, Samiee Aref MH, Zeinali S. High-Resolution HLA-A Typing in Normal Iranian Population. IRANIAN BIOMEDICAL JOURNAL 2017; 22:134-7. [PMID: 28952291 PMCID: PMC5786660 DOI: 10.22034/ibj.22.2.134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Background: Human leukocyte antigen (HLA) gene is a highly polymorphic region. HLA typing is required to match patients and donors for transplantation; therefore, development of HLA registries is necessary for finding HLA match donors. HLA system is highly informative, and numerous studies have been conducted on HLA allele distribution in different populations. Methods: In this study, 100 unrelated Iranian individuals were typed for HLA-A locus using sequence-based typing method. Samples were subjected to the PCR, followed by Sanger sequencing and software analysis. Results: A*02:01 (13%) and A*24:02 (12%) were the two most frequent alleles, while A*01:14, A*02:05, A*02:11, A*02:34, A*02:50, A*11:04, A*23:02, A*24:34, A*25:01, A*26:09, A*26:43, A*29:67, A*30:54, A*31:02, A*31:66, A*32:03, A*32:04, A*33:03, and A*66:15 alleles had the least frequencies (1%). Conclusion: This is the first report of HLA-A allele level typing in a randomized population of Iran and can be useful for development of national registries of HLA-typed volunteer marrow donors and local cord blood banks.
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Affiliation(s)
- Azadeh Hadadianpour
- Department of Biotechnology, College of Science, University of Tehran, Tehran, Iran.,Kawsar Human Genetics Research Center, Tehran, Iran
| | - Mohammad Hasan Samiee Aref
- Department of Biotechnology, College of Science, University of Tehran, Tehran, Iran.,Kawsar Human Genetics Research Center, Tehran, Iran
| | - Sirous Zeinali
- Kawsar Human Genetics Research Center, Tehran, Iran.,Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
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67
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Genotype-Specific Evolution of Hepatitis E Virus. J Virol 2017; 91:JVI.02241-16. [PMID: 28202767 DOI: 10.1128/jvi.02241-16] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 01/31/2017] [Indexed: 12/20/2022] Open
Abstract
Hepatitis E virus (HEV) is the most common cause of acute viral hepatitis globally. HEV comprises four genotypes with different geographic distributions and host ranges. We utilize this natural case-control study for investigating the evolution of zoonotic viruses compared to single-host viruses, using 244 near-full-length HEV genomes. Genome-wide estimates of the ratio of nonsynonymous to synonymous evolutionary changes (dN/dS ratio) located a region of overlapping reading frames, which is subject to positive selection in genotypes 3 and 4. The open reading frames (ORFs) involved have functions related to host-pathogen interaction, so genotype-specific evolution of these regions may reflect their fitness. Bayesian inference of evolutionary rates shows that genotypes 3 and 4 have significantly higher rates than genotype 1 across all ORFs. Reconstruction of the phylogenies of zoonotic genotypes demonstrates significant intermingling of isolates between hosts. We speculate that the genotype-specific differences may result from cyclical adaptation to different hosts in genotypes 3 and 4.IMPORTANCE Hepatitis E virus (HEV) is increasingly recognized as a pathogen that affects both the developing and the developed world. While most often clinically mild, HEV can be severe or fatal in certain demographics, such as expectant mothers. Like many other viral pathogens, HEV has been classified into several distinct genotypes. We show that most of the HEV genome is evolutionarily constrained. One locus of positive selection is unusual in that it encodes two distinct protein products. We are the first to detect positive selection in this overlap region. Genotype 1, which infects humans only, appears to be evolving differently from genotypes 3 and 4, which infect multiple species, possibly because genotypes 3 and 4 are unable to achieve the same fitness due to repeated host jumps.
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68
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Boquett JA, Nunes JM, Buhler S, de Oliveira MZ, Jobim LF, Jobim M, Fagundes NJR, Schüler-Faccini L, Sanchez-Mazas A. The HLA-A, -B and -DRB1 polymorphism in a large dataset of South Brazil bone marrow donors from Rio Grande do Sul. HLA 2016; 89:29-38. [PMID: 27910249 DOI: 10.1111/tan.12933] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 10/12/2016] [Accepted: 10/26/2016] [Indexed: 12/18/2022]
Abstract
Human leukocyte antigen (HLA) genes are very informative in population genetics studies and their variability has been widely used to reconstruct the history of geographic and/or demographic expansions of human populations. The characterization of HLA diversity at the population level is also fundamental in clinical studies, particularly for bone marrow transplantation programs. In this study, we investigated the HLA molecular variation in Rio Grande do Sul, South Brazil, in order to identify possible regional differences across this state. More than 97,000 bone marrow donors were typed at the HLA- A, -B and -DRB1 loci and analyzed by considering two kinds of subdivisions based on both self-identified ethnicity and place of residence: (a) the official geographic subdivision defined by the Brazilian Institute of Geography and Statistics and (b) known information about the colonization history of the state. HLA allele and haplotype frequencies were estimated and compared among the defined subgroups. The results indicate a lack of correlation between genetic variation and geography and thus no clear HLA genetic structure based on geographic criteria. On the other hand, major differences were observed regarding ethnicity. In addition, local populations from Rio Grande do Sul were found to be genetically similar to their corresponding parental European populations from Germany, Italy and Portugal, as documented by historical data. Overall, this study provides a thorough characterization of the HLA genetic variation in Rio Grande do Sul and a better understanding of its demographic history, being most useful for the development of more efficient strategies in bone marrow donors' recruitment.
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Affiliation(s)
- J A Boquett
- Instituto Nacional de Genética Médica Populacional (iNaGeMP), Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - J M Nunes
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva (iGE3), University of Geneva, Geneva, Switzerland
| | - S Buhler
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland.,Transplantation Immunology Unit and National Reference Laboratory for Histocompatibility, Department of Genetic and Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - M Z de Oliveira
- Instituto Nacional de Genética Médica Populacional (iNaGeMP), Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Advanced Visualization Laboratory (VIZLab), Universidade do Vale dos Sinos, São Leopoldo, Brazil
| | - L F Jobim
- Department of Immunology, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - M Jobim
- Department of Immunology, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - N J R Fagundes
- Instituto Nacional de Genética Médica Populacional (iNaGeMP), Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - L Schüler-Faccini
- Instituto Nacional de Genética Médica Populacional (iNaGeMP), Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - A Sanchez-Mazas
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva (iGE3), University of Geneva, Geneva, Switzerland
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69
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Romòn I, Montes C, Ligeiro D, Trindade H, Sanchez-Mazas A, Nunes JM, Buhler S. Mapping the HLA diversity of the Iberian Peninsula. Hum Immunol 2016; 77:832-840. [PMID: 27377016 DOI: 10.1016/j.humimm.2016.06.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Revised: 06/30/2016] [Accepted: 06/30/2016] [Indexed: 01/02/2023]
Abstract
The polymorphism of HLA genes can be used to reconstruct human peopling history. However, this huge diversity impairs successful matching in stem cell transplantation, a situation which has led to the recruitment of millions of donors worldwide. In parallel to the increase of recruitment, registries are progressively relying on information from population genetics to optimize their donor pools in terms of HLA variability. In this study, the HLA data of 65,000 Spanish bone marrow donors were analyzed together with 60,000 Portuguese individuals to provide a comprehensive HLA genetic map of the Iberian Peninsula. The frequencies of many alleles were shown to vary continuously across the Peninsula, either increasing or decreasing from the Mediterranean coast to the Atlantic domain or from the Strait of Gibraltar to the Pyrenees and Bay of Biscay. Similar patterns were observed for several haplotypes. In addition, within some regions neighboring provinces share a close genetic similarity. These results outline the genetic landscape of the Iberian Peninsula, and confirm that the analysis of the HLA polymorphism may reveal relevant signatures of past demographic events even when data from donor registries are used. This conclusion stimulates future developments of the Spanish registry, presented here for the first time.
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Affiliation(s)
- Iñigo Romòn
- Histocompatibility Laboratory, Hematology and Transfusion Service, Hospital Universitario Marqués de Valdecilla - IFIMAV, Santander, Spain.
| | - Carmen Montes
- Histocompatibility Laboratory, Hematology and Transfusion Service, Hospital Universitario Marqués de Valdecilla - IFIMAV, Santander, Spain
| | - Dario Ligeiro
- Lisbon Center for Blood and Transplantation, Instituto Português de Sangue e Transplantação, IP, Lisbon, Portugal
| | - Hélder Trindade
- Lisbon Center for Blood and Transplantation, Instituto Português de Sangue e Transplantação, IP, Lisbon, Portugal
| | - Alicia Sanchez-Mazas
- Laboratory of Anthropology, Genetics and Peopling history (AGP), Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Switzerland; Institute of Genetics and Genomics in Geneva (IGE3), Switzerland
| | - José Manuel Nunes
- Laboratory of Anthropology, Genetics and Peopling history (AGP), Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Switzerland; Institute of Genetics and Genomics in Geneva (IGE3), Switzerland
| | - Stéphane Buhler
- Laboratory of Anthropology, Genetics and Peopling history (AGP), Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Switzerland; Transplantation Immunology Unit and National Reference Laboratory for Histocompatibility (UIT/LNRH), Department of Genetic and Laboratory Medicine, Geneva University Hospitals, Switzerland.
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70
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Trombetta B, Fantini G, D'Atanasio E, Sellitto D, Cruciani F. Evidence of extensive non-allelic gene conversion among LTR elements in the human genome. Sci Rep 2016; 6:28710. [PMID: 27346230 PMCID: PMC4921805 DOI: 10.1038/srep28710] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 06/06/2016] [Indexed: 12/16/2022] Open
Abstract
Long Terminal Repeats (LTRs) are nearly identical DNA sequences found at either end of Human Endogenous Retroviruses (HERVs). The high sequence similarity that exists among different LTRs suggests they could be substrate of ectopic gene conversion events. To understand the extent to which gene conversion occurs and to gain new insights into the evolutionary history of these elements in humans, we performed an intra-species phylogenetic study of 52 LTRs on different unrelated Y chromosomes. From this analysis, we obtained direct evidence that demonstrates the occurrence of ectopic gene conversion in several LTRs, with donor sequences located on both sex chromosomes and autosomes. We also found that some of these elements are characterized by an extremely high density of polymorphisms, showing one of the highest nucleotide diversities in the human genome, as well as a complex patchwork of sequences derived from different LTRs. Finally, we highlighted the limits of current short-read NGS studies in the analysis of genetic diversity of the LTRs in the human genome. In conclusion, our comparative re-sequencing analysis revealed that ectopic gene conversion is a common event in the evolution of LTR elements, suggesting complex genetic links among LTRs from different chromosomes.
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Affiliation(s)
- Beniamino Trombetta
- Dipartimento di Biologia e Biotecnologie "Charles Darwin", Sapienza Università di Roma, Rome, Italy
| | - Gloria Fantini
- Dipartimento di Biologia e Biotecnologie "Charles Darwin", Sapienza Università di Roma, Rome, Italy
| | - Eugenia D'Atanasio
- Dipartimento di Biologia e Biotecnologie "Charles Darwin", Sapienza Università di Roma, Rome, Italy
| | | | - Fulvio Cruciani
- Dipartimento di Biologia e Biotecnologie "Charles Darwin", Sapienza Università di Roma, Rome, Italy.,Istituto di Biologia e Patologia Molecolari, CNR, Rome, Italy.,Istituto Pasteur-Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, Italy
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71
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Buhler S, Nunes JM, Sanchez-Mazas A. HLA class I molecular variation and peptide-binding properties suggest a model of joint divergent asymmetric selection. Immunogenetics 2016; 68:401-416. [PMID: 27233953 PMCID: PMC4911380 DOI: 10.1007/s00251-016-0918-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 05/17/2016] [Indexed: 01/20/2023]
Abstract
The main function of HLA class I molecules is to present pathogen-derived peptides to cytotoxic T lymphocytes. This function is assumed to drive the maintenance of an extraordinary amount of polymorphism at each HLA locus, providing an immune advantage to heterozygote individuals capable to present larger repertories of peptides than homozygotes. This seems contradictory, however, with a reduced diversity at individual HLA loci exhibited by some isolated populations. This study shows that the level of functional diversity predicted for the two HLA-A and HLA-B genes considered simultaneously is similar (almost invariant) between 46 human populations, even when a reduced diversity exists at each locus. We thus propose that HLA-A and HLA-B evolved through a model of joint divergent asymmetric selection conferring all populations an equivalent immune potential. The distinct pattern observed for HLA-C is explained by its functional evolution towards killer cell immunoglobulin-like receptor (KIR) activity regulation rather than peptide presentation.
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Affiliation(s)
- Stéphane Buhler
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution, Anthropology Unit, University of Geneva, Geneva, Switzerland. .,Transplantation Immunology Unit & National Reference Laboratory for Histocompatibility, Department of Genetic and Laboratory Medicine, Geneva University Hospital, Geneva, Switzerland.
| | - José Manuel Nunes
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution, Anthropology Unit, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva (iGE3), University of Geneva, Geneva, Switzerland
| | - Alicia Sanchez-Mazas
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution, Anthropology Unit, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva (iGE3), University of Geneva, Geneva, Switzerland
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72
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Currat M, Gerbault P, Di D, Nunes JM, Sanchez-Mazas A. Forward-in-Time, Spatially Explicit Modeling Software to Simulate Genetic Lineages Under Selection. Evol Bioinform Online 2016; 11:27-39. [PMID: 26949332 PMCID: PMC4768942 DOI: 10.4137/ebo.s33488] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 12/10/2015] [Accepted: 12/13/2015] [Indexed: 12/20/2022] Open
Abstract
SELECTOR is a software package for studying the evolution of multiallelic genes under balancing or positive selection while simulating complex evolutionary scenarios that integrate demographic growth and migration in a spatially explicit population framework. Parameters can be varied both in space and time to account for geographical, environmental, and cultural heterogeneity. SELECTOR can be used within an approximate Bayesian computation estimation framework. We first describe the principles of SELECTOR and validate the algorithms by comparing its outputs for simple models with theoretical expectations. Then, we show how it can be used to investigate genetic differentiation of loci under balancing selection in interconnected demes with spatially heterogeneous gene flow. We identify situations in which balancing selection reduces genetic differentiation between population groups compared with neutrality and explain conflicting outcomes observed for human leukocyte antigen loci. These results and three previously published applications demonstrate that SELECTOR is efficient and robust for building insight into human settlement history and evolution.
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Affiliation(s)
- Mathias Currat
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland
| | - Pascale Gerbault
- Research Department of Genetics, Evolution and Environment, University College London, London, UK.; Department of Anthropology, University College London, London, UK
| | - Da Di
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland
| | - José M Nunes
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland
| | - Alicia Sanchez-Mazas
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland
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73
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Linnik JE, Egli A. Impact of host genetic polymorphisms on vaccine induced antibody response. Hum Vaccin Immunother 2016; 12:907-15. [PMID: 26809773 DOI: 10.1080/21645515.2015.1119345] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Many host- and vaccine-specific factors modulate an antibody response. Host genetic polymorphisms, in particular, modulate the immune response in multiple ways on different scales. This review article describes how information on host genetic polymorphisms and corresponding immune cascades may be used to generate personalized vaccine strategies to optimize the antibody response.
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Affiliation(s)
- Janina E Linnik
- a Applied Microbiology Research , Department of Biomedicine, University Basel , Basel , Switzerland.,b Department of Biosystems Science and Engineering , ETH Zürich , Basel , Switzerland.,c Swiss Institute of Bioinformatics , Basel , Switzerland
| | - Adrian Egli
- a Applied Microbiology Research , Department of Biomedicine, University Basel , Basel , Switzerland.,d Clinical Microbiology, University Hospital Basel , Basel , Switzerland
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74
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Podgorná E, Diallo I, Vangenot C, Sanchez-Mazas A, Sabbagh A, Černý V, Poloni ES. Variation in NAT2 acetylation phenotypes is associated with differences in food-producing subsistence modes and ecoregions in Africa. BMC Evol Biol 2015; 15:263. [PMID: 26620671 PMCID: PMC4665893 DOI: 10.1186/s12862-015-0543-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 11/13/2015] [Indexed: 12/21/2022] Open
Abstract
Background Dietary changes associated to shifts in subsistence strategies during human evolution may have induced new selective pressures on phenotypes, as currently held for lactase persistence. Similar hypotheses exist for arylamine N-acetyltransferase 2 (NAT2) mediated acetylation capacity, a well-known pharmacogenetic trait with wide inter-individual variation explained by polymorphisms in the NAT2 gene. The environmental causative factor (if any) driving its evolution is as yet unknown, but significant differences in prevalence of acetylation phenotypes are found between hunter-gatherer and food-producing populations, both in sub-Saharan Africa and worldwide, and between agriculturalists and pastoralists in Central Asia. These two subsistence strategies also prevail among sympatric populations of the African Sahel, but knowledge on NAT2 variation among African pastoral nomads was up to now very scarce. Here we addressed the hypothesis of different selective pressures associated to the agriculturalist or pastoralist lifestyles having acted on the evolution of NAT2 by sequencing the gene in 287 individuals from five pastoralist and one agriculturalist Sahelian populations. Results We show that the significant NAT2 genetic structure of African populations is mainly due to frequency differences of three major haplotypes, two of which are categorized as decreased function alleles (NAT2*5B and NAT2*6A), particularly common in populations living in arid environments, and one fast allele (NAT2*12A), more frequently detected in populations living in tropical humid environments. This genetic structure does associate more strongly with a classification of populations according to ecoregions than to subsistence strategies, mainly because most Sahelian and East African populations display little to no genetic differentiation between them, although both regions hold nomadic or semi-nomadic pastoralist and sedentary agriculturalist communities. Furthermore, we found significantly higher predicted proportions of slow acetylators in pastoralists than in agriculturalists, but also among food-producing populations living in the Sahelian and dry savanna zones than in those living in humid environments, irrespective of their mode of subsistence. Conclusion Our results suggest a possible independent influence of both the dietary habits associated with subsistence modes and the chemical environment associated with climatic zones and biomes on the evolution of NAT2 diversity in sub-Saharan African populations. Electronic supplementary material The online version of this article (doi:10.1186/s12862-015-0543-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Eliška Podgorná
- Department of the Archaeology of Landscape and Archaeobiology, Archaeogenetics Laboratory, Institute of Archaeology of the Academy of Sciences of the Czech Republic, Prague, Czech Republic. .,Department of Genetics and Evolution, Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling History, University of Geneva, 12 Rue Gustave-Revilliod, 1211, Geneva 4, Switzerland.
| | - Issa Diallo
- Département de Linguistique et Langues Nationales, Institut des Sciences des Sociétés, CNRST, Ouagadougou, Burkina Faso.
| | - Christelle Vangenot
- Department of Genetics and Evolution, Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling History, University of Geneva, 12 Rue Gustave-Revilliod, 1211, Geneva 4, Switzerland.
| | - Alicia Sanchez-Mazas
- Department of Genetics and Evolution, Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling History, University of Geneva, 12 Rue Gustave-Revilliod, 1211, Geneva 4, Switzerland.
| | - Audrey Sabbagh
- IRD, UMR216, Mère et enfant face aux infections tropicales, Université Paris Descartes, Sorbonne Paris Cité, Faculté des Sciences Pharmaceutiques et Biologiques, Paris, France.
| | - Viktor Černý
- Department of the Archaeology of Landscape and Archaeobiology, Archaeogenetics Laboratory, Institute of Archaeology of the Academy of Sciences of the Czech Republic, Prague, Czech Republic.
| | - Estella S Poloni
- Department of Genetics and Evolution, Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling History, University of Geneva, 12 Rue Gustave-Revilliod, 1211, Geneva 4, Switzerland.
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75
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Intrahaplotypic Variants Differentiate Complex Linkage Disequilibrium within Human MHC Haplotypes. Sci Rep 2015; 5:16972. [PMID: 26593880 PMCID: PMC4655331 DOI: 10.1038/srep16972] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 10/22/2015] [Indexed: 12/21/2022] Open
Abstract
Distinct regions of long-range genetic fixation in the human MHC region, known as conserved extended haplotypes (CEHs), possess unique genomic characteristics and are strongly associated with numerous diseases. While CEHs appear to be homogeneous by SNP analysis, the nature of fine variations within their genomic structure is unknown. Using multiple, MHC-homozygous cell lines, we demonstrate extensive sequence conservation in two common Asian MHC haplotypes: A33-B58-DR3 and A2-B46-DR9. However, characterization of phase-resolved MHC haplotypes revealed unique intra-CEH patterns of variation and uncovered 127 single nucleotide variants (SNVs) which are missing from public databases. We further show that the strong linkage disequilibrium structure within the human MHC that typically confounds precise identification of genetic features can be resolved using intra-CEH variants, as evidenced by rs3129063 and rs448489, which affect expression of ZFP57, a gene important in methylation and epigenetic regulation. This study demonstrates an improved strategy that can be used towards genetic dissection of diseases.
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76
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Di D, Sanchez-Mazas A, Currat M. Computer simulation of human leukocyte antigen genes supports two main routes of colonization by human populations in East Asia. BMC Evol Biol 2015; 15:240. [PMID: 26530905 PMCID: PMC4632674 DOI: 10.1186/s12862-015-0512-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 10/19/2015] [Indexed: 11/10/2022] Open
Abstract
Background Recent genetic studies have suggested that the colonization of East Asia by modern humans was more complex than a single origin from the South, and that a genetic contribution via a Northern route was probably quite substantial. Results Here we use a spatially-explicit computer simulation approach to investigate the human migration hypotheses of this region based on one-route or two-route models. We test the likelihood of each scenario by using Human Leukocyte Antigen (HLA) − A, −B, and − DRB1 genetic data of East Asian populations, with both selective and demographic parameters considered. The posterior distribution of each parameter is estimated by an Approximate Bayesian Computation (ABC) approach. Conclusions Our results strongly support a model with two main routes of colonization of East Asia on both sides of the Himalayas, with distinct demographic histories in Northern and Southern populations, characterized by more isolation in the South. In East Asia, gene flow between populations originating from the two routes probably existed until a remote prehistoric period, explaining the continuous pattern of genetic variation currently observed along the latitude. A significant although dissimilar level of balancing selection acting on the three HLA loci is detected, but its effect on the local genetic patterns appears to be minor compared to those of past demographic events. Electronic supplementary material The online version of this article (doi:10.1186/s12862-015-0512-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Da Di
- Department of Genetics and Evolution - Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling history (AGP lab), University of Geneva, 12 rue Gustave-Revilliod, Geneva, CH-1211, Geneva 4, Switzerland.
| | - Alicia Sanchez-Mazas
- Department of Genetics and Evolution - Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling history (AGP lab), University of Geneva, 12 rue Gustave-Revilliod, Geneva, CH-1211, Geneva 4, Switzerland. .,Institute of Genetics and Genomics in Geneva (IGE3), University of Geneva Medical Centre (CMU), 1 rue Michel-Servet, Geneva, CH-1211, Geneva 4, Switzerland.
| | - Mathias Currat
- Department of Genetics and Evolution - Anthropology Unit, Laboratory of Anthropology, Genetics and Peopling history (AGP lab), University of Geneva, 12 rue Gustave-Revilliod, Geneva, CH-1211, Geneva 4, Switzerland.
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77
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Dos Santos Francisco R, Buhler S, Nunes JM, Bitarello BD, França GS, Meyer D, Sanchez-Mazas A. HLA supertype variation across populations: new insights into the role of natural selection in the evolution of HLA-A and HLA-B polymorphisms. Immunogenetics 2015; 67:651-63. [PMID: 26459025 PMCID: PMC4636516 DOI: 10.1007/s00251-015-0875-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Accepted: 09/29/2015] [Indexed: 01/03/2023]
Abstract
Supertypes are groups of human leukocyte antigen (HLA) alleles which bind overlapping sets of peptides due to sharing specific residues at the anchor positions-the B and F pockets-of the peptide-binding region (PBR). HLA alleles within the same supertype are expected to be functionally similar, while those from different supertypes are expected to be functionally distinct, presenting different sets of peptides. In this study, we applied the supertype classification to the HLA-A and HLA-B data of 55 worldwide populations in order to investigate the effect of natural selection on supertype rather than allelic variation at these loci. We compared the nucleotide diversity of the B and F pockets with that of the other PBR regions through a resampling procedure and compared the patterns of within-population heterozygosity (He) and between-population differentiation (G ST) observed when using the supertype definition to those estimated when using randomized groups of alleles. At HLA-A, low levels of variation are observed at B and F pockets and randomized He and G ST do not differ from the observed data. By contrast, HLA-B concentrates most of the differences between supertypes, the B pocket showing a particularly high level of variation. Moreover, at HLA-B, the reassignment of alleles into random groups does not reproduce the patterns of population differentiation observed with supertypes. We thus conclude that differently from HLA-A, for which supertype and allelic variation show similar patterns of nucleotide diversity within and between populations, HLA-B has likely evolved through specific adaptations of its B pocket to local pathogens.
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Affiliation(s)
- Rodrigo Dos Santos Francisco
- Department of Genetics and Evolutionary Biology, University of São Paulo, São Paulo, Brazil. .,Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution-Anthropology Unit, University of Geneva, Geneva, Switzerland. .,Hospital Israelita Albert Einstein, São Paulo, Brazil.
| | - Stéphane Buhler
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution-Anthropology Unit, University of Geneva, Geneva, Switzerland.,Transplantation Immunology Unit and National Reference Laboratory for Histocompatibility, Department of Genetic and Laboratory Medicine, Geneva University Hospital, Geneva, Switzerland
| | - José Manuel Nunes
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution-Anthropology Unit, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva (IGE3), Geneva, Switzerland
| | | | - Gustavo Starvaggi França
- Department of Biochemistry, Chemistry Institute, University of São Paulo, São Paulo, Brazil.,Molecular Oncology Center, Sírio-Libanês Hospital, São Paulo, Brazil
| | - Diogo Meyer
- Department of Genetics and Evolutionary Biology, University of São Paulo, São Paulo, Brazil.
| | - Alicia Sanchez-Mazas
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution-Anthropology Unit, University of Geneva, Geneva, Switzerland. .,Institute of Genetics and Genomics in Geneva (IGE3), Geneva, Switzerland.
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78
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Lau Q, Yasukochi Y, Satta Y. A limit to the divergent allele advantage model supported by variable pathogen recognition across HLA-DRB1 allele lineages. ACTA ACUST UNITED AC 2015; 86:343-52. [PMID: 26392055 PMCID: PMC5054888 DOI: 10.1111/tan.12667] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 08/24/2015] [Accepted: 08/26/2015] [Indexed: 11/29/2022]
Abstract
Genetic diversity in human leukocyte antigen (HLA) molecules is thought to have arisen from the co‐evolution between host and pathogen and maintained by balancing selection. Heterozygote advantage is a common proposed scenario for maintaining high levels of diversity in HLA genes, and extending from this, the divergent allele advantage (DAA) model suggests that individuals with more divergent HLA alleles bind and recognize a wider array of antigens. While the DAA model seems biologically suitable for driving HLA diversity, there is likely an upper threshold to the amount of sequence divergence. We used peptide‐binding and pathogen‐recognition capacity of DRB1 alleles as a model to further explore the DAA model; within the DRB1 locus, we examined binding predictions based on two distinct phylogenetic groups (denoted group A and B) previously identified based on non‐peptide‐binding region (PBR) nucleotide sequences. Predictions in this study support that group A allele and group B allele lineages have contrasting binding/recognition capacity, with only the latter supporting the DAA model. Furthermore, computer simulations revealed an inconsistency in the DAA model alone with observed extent of polymorphisms, supporting that the DAA model could only work effectively in combination with other mechanisms. Overall, we support that the mechanisms driving HLA diversity are non‐exclusive. By investigating the relationships among HLA alleles, and pathogens recognized, we can provide further insights into the mechanisms on how humans have adapted to infectious diseases over time.
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Affiliation(s)
- Q Lau
- Department of Evolutionary Studies of Biosystems, Sokendai (The Graduate University for Advanced Studies), Kanagawa, Japan
| | - Y Yasukochi
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
| | - Y Satta
- Department of Evolutionary Studies of Biosystems, Sokendai (The Graduate University for Advanced Studies), Kanagawa, Japan
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79
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Testi M, Battarra M, Lucarelli G, Isgro A, Morrone A, Akinyanju O, Wakama T, Nunes JM, Andreani M, Sanchez-Mazas A. HLA-A-B-C-DRB1-DQB1 phased haplotypes in 124 Nigerian families indicate extreme HLA diversity and low linkage disequilibrium in Central-West Africa. ACTA ACUST UNITED AC 2015; 86:285-92. [DOI: 10.1111/tan.12642] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Revised: 06/18/2015] [Accepted: 07/20/2015] [Indexed: 12/01/2022]
Affiliation(s)
- M. Testi
- Laboratory of Immunogenetics and Transplant Biology, IME Foundation; Policlinic of the University of Tor Vergata; Rome Italy
| | - M. Battarra
- Laboratory of Immunogenetics and Transplant Biology, IME Foundation; Policlinic of the University of Tor Vergata; Rome Italy
| | - G. Lucarelli
- International Center for Transplantation in Thalassemia and Sickle Cell Anemia, IME Foundation; Policlinic of the University of Tor Vergata; Rome Italy
| | - A. Isgro
- International Center for Transplantation in Thalassemia and Sickle Cell Anemia, IME Foundation; Policlinic of the University of Tor Vergata; Rome Italy
| | - A. Morrone
- International Center for Transplantation in Thalassemia and Sickle Cell Anemia, IME Foundation; Policlinic of the University of Tor Vergata; Rome Italy
| | | | | | - J. M. Nunes
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution-Anthropology Unit; University of Geneva; Geneva Switzerland
| | - M. Andreani
- Laboratory of Immunogenetics and Transplant Biology, IME Foundation; Policlinic of the University of Tor Vergata; Rome Italy
| | - A. Sanchez-Mazas
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution-Anthropology Unit; University of Geneva; Geneva Switzerland
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80
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Human Leukocyte Antigen Diversity: A Southern African Perspective. J Immunol Res 2015; 2015:746151. [PMID: 26347896 PMCID: PMC4549606 DOI: 10.1155/2015/746151] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 07/26/2015] [Indexed: 12/30/2022] Open
Abstract
Despite the increasingly well-documented evidence of high genetic, ethnic, and linguistic diversity amongst African populations, there is limited data on human leukocyte antigen (HLA) diversity in these populations. HLA is part of the host defense mechanism mediated through antigen presentation to effector cells of the immune system. With the high disease burden in southern Africa, HLA diversity data is increasingly important in the design of population-specific vaccines and the improvement of transplantation therapeutic interventions. This review highlights the paucity of HLA diversity data amongst southern African populations and defines a need for information of this kind. This information will support disease association studies, provide guidance in vaccine design, and improve transplantation outcomes.
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81
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Renton AE, Pliner HA, Provenzano C, Evoli A, Ricciardi R, Nalls MA, Marangi G, Abramzon Y, Arepalli S, Chong S, Hernandez DG, Johnson JO, Bartoccioni E, Scuderi F, Maestri M, Gibbs JR, Errichiello E, Chiò A, Restagno G, Sabatelli M, Macek M, Scholz SW, Corse A, Chaudhry V, Benatar M, Barohn RJ, McVey A, Pasnoor M, Dimachkie MM, Rowin J, Kissel J, Freimer M, Kaminski HJ, Sanders DB, Lipscomb B, Massey JM, Chopra M, Howard JF, Koopman WJ, Nicolle MW, Pascuzzi RM, Pestronk A, Wulf C, Florence J, Blackmore D, Soloway A, Siddiqi Z, Muppidi S, Wolfe G, Richman D, Mezei MM, Jiwa T, Oger J, Drachman DB, Traynor BJ. A genome-wide association study of myasthenia gravis. JAMA Neurol 2015; 72:396-404. [PMID: 25643325 DOI: 10.1001/jamaneurol.2014.4103] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
IMPORTANCE Myasthenia gravis is a chronic, autoimmune, neuromuscular disease characterized by fluctuating weakness of voluntary muscle groups. Although genetic factors are known to play a role in this neuroimmunological condition, the genetic etiology underlying myasthenia gravis is not well understood. OBJECTIVE To identify genetic variants that alter susceptibility to myasthenia gravis, we performed a genome-wide association study. DESIGN, SETTING, AND PARTICIPANTS DNA was obtained from 1032 white individuals from North America diagnosed as having acetylcholine receptor antibody-positive myasthenia gravis and 1998 race/ethnicity-matched control individuals from January 2010 to January 2011. These samples were genotyped on Illumina OmniExpress single-nucleotide polymorphism arrays. An independent cohort of 423 Italian cases and 467 Italian control individuals were used for replication. MAIN OUTCOMES AND MEASURES We calculated P values for association between 8,114,394 genotyped and imputed variants across the genome and risk for developing myasthenia gravis using logistic regression modeling. A threshold P value of 5.0×10(-8) was set for genome-wide significance after Bonferroni correction for multiple testing. RESULTS In the overall case-control cohort, we identified association signals at CTLA4 (rs231770; P=3.98×10(-8); odds ratio, 1.37; 95% CI, 1.25-1.49), HLA-DQA1 (rs9271871; P=1.08×10(-8); odds ratio, 2.31; 95% CI, 2.02-2.60), and TNFRSF11A (rs4263037; P=1.60×10(-9); odds ratio, 1.41; 95% CI, 1.29-1.53). These findings replicated for CTLA4 and HLA-DQA1 in an independent cohort of Italian cases and control individuals. Further analysis revealed distinct, but overlapping, disease-associated loci for early- and late-onset forms of myasthenia gravis. In the late-onset cases, we identified 2 association peaks: one was located in TNFRSF11A (rs4263037; P=1.32×10(-12); odds ratio, 1.56; 95% CI, 1.44-1.68) and the other was detected in the major histocompatibility complex on chromosome 6p21 (HLA-DQA1; rs9271871; P=7.02×10(-18); odds ratio, 4.27; 95% CI, 3.92-4.62). Association within the major histocompatibility complex region was also observed in early-onset cases (HLA-DQA1; rs601006; P=2.52×10(-11); odds ratio, 4.0; 95% CI, 3.57-4.43), although the set of single-nucleotide polymorphisms was different from that implicated among late-onset cases. CONCLUSIONS AND RELEVANCE Our genetic data provide insights into aberrant cellular mechanisms responsible for this prototypical autoimmune disorder. They also suggest that clinical trials of immunomodulatory drugs related to CTLA4 and that are already Food and Drug Administration approved as therapies for other autoimmune diseases could be considered for patients with refractory disease.
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Affiliation(s)
- Alan E Renton
- Neuromuscular Diseases Research Unit, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland
| | - Hannah A Pliner
- Neuromuscular Diseases Research Unit, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland
| | - Carlo Provenzano
- Institute of General Pathology, Catholic University, Rome, Italy
| | - Amelia Evoli
- Institute of Neurology, Catholic University, Rome, Italy
| | - Roberta Ricciardi
- Department of Neuroscience, Cisanello Hospital, University of Pisa, Pisa, Italy
| | - Michael A Nalls
- Molecular Genetics Section, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland
| | - Giuseppe Marangi
- Neuromuscular Diseases Research Unit, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland6Institute of Medical Genetics, Catholic University, Rome, Italy
| | - Yevgeniya Abramzon
- Neuromuscular Diseases Research Unit, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland
| | - Sampath Arepalli
- Genomics Technology Group, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland
| | - Sean Chong
- Genomics Technology Group, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland
| | - Dena G Hernandez
- Genomics Technology Group, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland
| | - Janel O Johnson
- Neuromuscular Diseases Research Unit, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland
| | | | - Flavia Scuderi
- Institute of General Pathology, Catholic University, Rome, Italy
| | | | - J Raphael Gibbs
- Computational Biology Core, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland
| | - Edoardo Errichiello
- Neuromuscular Diseases Research Unit, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland9Rita Levi Montalcini Department of Neuroscience, University of Turin, Tu
| | - Adriano Chiò
- Rita Levi Montalcini Department of Neuroscience, University of Turin, Turin, Italy
| | - Gabriella Restagno
- Molecular Genetics Unit, Department of Clinical Pathology, ASO OIRM-S Anna, Turin, Italy
| | | | - Mark Macek
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Sonja W Scholz
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Andrea Corse
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Vinay Chaudhry
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Michael Benatar
- Department of Neurology, University of Miami, Miami, Florida
| | - Richard J Barohn
- Department of Neurology, University of Kansas Medical Center, Kansas City
| | - April McVey
- Department of Neurology, University of Kansas Medical Center, Kansas City
| | - Mamatha Pasnoor
- Department of Neurology, University of Kansas Medical Center, Kansas City
| | - Mazen M Dimachkie
- Department of Neurology, University of Kansas Medical Center, Kansas City
| | - Julie Rowin
- Department of Neurology, University of Illinois College of Medicine, Chicago
| | - John Kissel
- Department of Neurology, Ohio State University Medical Center, Columbus
| | - Miriam Freimer
- Department of Neurology, Ohio State University Medical Center, Columbus
| | - Henry J Kaminski
- Department of Neurology, George Washington University, Washington, DC
| | - Donald B Sanders
- Department of Neurology, Duke University Medical Center, Durham, North Carolina
| | - Bernadette Lipscomb
- Department of Neurology, Duke University Medical Center, Durham, North Carolina
| | - Janice M Massey
- Department of Neurology, Duke University Medical Center, Durham, North Carolina
| | - Manisha Chopra
- Department of Neurology, University of North Carolina, Chapel Hill
| | - James F Howard
- Department of Neurology, University of North Carolina, Chapel Hill
| | - Wilma J Koopman
- Department of Clinical Neurosciences, London Health Sciences Centre, London, Ontario, Canada
| | - Michael W Nicolle
- Department of Clinical Neurosciences, London Health Sciences Centre, London, Ontario, Canada
| | - Robert M Pascuzzi
- Department of Neurology, Indiana University-Purdue University, Indianapolis
| | - Alan Pestronk
- Department of Neurology, Washington University School of Medicine, St Louis, Missouri
| | - Charlie Wulf
- Department of Neurology, Washington University School of Medicine, St Louis, Missouri
| | - Julaine Florence
- Department of Neurology, Washington University School of Medicine, St Louis, Missouri
| | - Derrick Blackmore
- Department of Medicine, University of Alberta Hospital, Edmonton, Alberta, Canada
| | - Aimee Soloway
- Department of Medicine, University of Alberta Hospital, Edmonton, Alberta, Canada
| | - Zaeem Siddiqi
- Department of Medicine, University of Alberta Hospital, Edmonton, Alberta, Canada
| | - Srikanth Muppidi
- Department of Neurology, University at Buffalo SMBS, State University of New York, Buffalo
| | - Gil Wolfe
- Department of Neurology, University at Buffalo SMBS, State University of New York, Buffalo
| | - David Richman
- Department of Neurology, University of California, Davis Medical Center
| | - Michelle M Mezei
- Division of Neurology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Theresa Jiwa
- Division of Neurology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Joel Oger
- Division of Neurology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Daniel B Drachman
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Bryan J Traynor
- Neuromuscular Diseases Research Unit, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Porter Neuroscience Research Center, Bethesda, Maryland11Department of Neurology, Johns Hopkins School of Medicine, Baltimore, M
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Inotai D, Szilvasi A, Benko S, Boros-Major A, Illes Z, Bors A, Kiss KP, Rajczy K, Gelle-Hossó A, Buhler S, Nunes JM, Sanchez-Mazas A, Tordai A. HLA genetic diversity in Hungarians and Hungarian Gypsies: complementary differentiation patterns and demographic signals revealed by HLA-A, -B and -DRB1 in Central Europe. ACTA ACUST UNITED AC 2015; 86:115-21. [PMID: 26149581 DOI: 10.1111/tan.12600] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 05/13/2015] [Accepted: 06/02/2015] [Indexed: 11/30/2022]
Abstract
Systematic analyses of human leukocyte antigen (HLA) profiles in different populations may increase the efficiency of bone marrow donor selection and help reconstructing human peopling history. We typed HLA-A, -B, and -DRB1 allele groups in two bone marrow donor cohorts of 2402 Hungarians and 186 Hungarian Gypsies and compared them with several Central-European, Spanish Gypsy, and Indian populations. Our results indicate that different European Gypsy populations share a common origin but diverged genetically as a consequence of founder effect and rapid genetic drift, whereas other European populations are related genetically in relation to geography. This study also suggests that while HLA-A accurately depicts the effects of genetic drift, HLA-B, and -DRB1 conserve more signatures of ancient population relationships, as a result of balancing selection.
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Affiliation(s)
- D Inotai
- Laboratory of Transplantation Immunogenetics, Hungarian National Blood Transfusion Service, Budapest, Hungary
| | - A Szilvasi
- Laboratory of Transplantation Immunogenetics, Hungarian National Blood Transfusion Service, Budapest, Hungary
| | - S Benko
- Laboratory of Transplantation Immunogenetics, Hungarian National Blood Transfusion Service, Budapest, Hungary
| | - A Boros-Major
- Laboratory of Transplantation Immunogenetics, Hungarian National Blood Transfusion Service, Budapest, Hungary
| | - Z Illes
- Laboratory of Transplantation Immunogenetics, Hungarian National Blood Transfusion Service, Budapest, Hungary
| | - A Bors
- Molecular Diagnostics, Hungarian National Blood Transfusion Service, Budapest, Hungary
| | - K P Kiss
- Molecular Diagnostics, Hungarian National Blood Transfusion Service, Budapest, Hungary
| | - K Rajczy
- Bone Marrow Donor Registry, Hungarian Blood Transfusion Service, Budapest, Hungary
| | - A Gelle-Hossó
- Bone Marrow Donor Registry, Hungarian Blood Transfusion Service, Budapest, Hungary
| | - S Buhler
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland
| | - J M Nunes
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland
| | - A Sanchez-Mazas
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland
| | - A Tordai
- Laboratory of Transplantation Immunogenetics, Hungarian National Blood Transfusion Service, Budapest, Hungary.,Molecular Diagnostics, Hungarian National Blood Transfusion Service, Budapest, Hungary
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83
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Trans-Species Polymorphism in Immune Genes: General Pattern or MHC-Restricted Phenomenon? J Immunol Res 2015; 2015:838035. [PMID: 26090501 PMCID: PMC4458282 DOI: 10.1155/2015/838035] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 05/04/2015] [Indexed: 11/24/2022] Open
Abstract
Immunity exhibits extraordinarily high levels of variation. Evolution of the immune system in response to host-pathogen interactions in particular ecological contexts appears to be frequently associated with diversifying selection increasing the genetic variability. Many studies have documented that immunologically relevant polymorphism observed today may be tens of millions years old and may predate the emergence of present species. This pattern can be explained by the concept of trans-species polymorphism (TSP) predicting the maintenance and sharing of favourable functionally important alleles of immune-related genes between species due to ongoing balancing selection. Despite the generality of this concept explaining the long-lasting adaptive variation inherited from ancestors, current research in TSP has vastly focused only on major histocompatibility complex (MHC). In this review we summarise the evidence available on TSP in human and animal immune genes to reveal that TSP is not a MHC-specific evolutionary pattern. Further research should clearly pay more attention to the investigation of TSP in innate immune genes and especially pattern recognition receptors which are promising candidates for this type of evolution. More effort should also be made to distinguish TSP from convergent evolution and adaptive introgression. Identification of balanced TSP variants may represent an accurate approach in evolutionary medicine to recognise disease-resistance alleles.
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84
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Buhler S, Nunes JM, Sanchez-Mazas A, Richard L. HLA-A, B and DRB1 genetic heterogeneity in Quebec. Int J Immunogenet 2015; 42:69-77. [PMID: 25639978 DOI: 10.1111/iji.12177] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 12/19/2014] [Accepted: 01/09/2015] [Indexed: 12/24/2022]
Abstract
Recent studies have shown that under specific conditions such as high sample sizes and Hardy-Weinberg equilibrium, bone marrow donor registry data can be used to describe HLA molecular variation across a specific geographic area, thus providing excellent data sets to infer human migrations history. The province of Quebec is known to have experienced a complex history of settlement, characterized by multiple migrations and demographic changes. We thus analysed the data of more than 13 000 unrelated individuals acting as volunteer bone marrow donors who were molecularly typed for HLA-A, B and DRB1 polymorphisms in the Héma-Quebec registry. HLA allelic and haplotypic frequencies were estimated and compared among regions. The results indicate that, despite an overall low genetic diversity in Quebec, genetic variation is correlated with geography, compatible with isolation-by-distance across the province. However, some localities also harbour contrasting genetic profiles, that is a highly diversified genetic pool in the two main urban centres (Montréal and Laval) and a more pronounced genetic divergence of two specific regions characterized by a peculiar peopling history (Saguenay-Lac-St-Jean and Gaspésie-Îles-De-La-Madeleine). In agreement with other independent molecular markers, the observations based on HLA data thus account for the main demographic mechanisms that shaped the genetic structure of the present day Quebecer population. In addition, the detailed analysis of the Héma-Quebec registry provides key genetic information on which an efficient bone marrow transplantation recruitment strategy can be settled.
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Affiliation(s)
- S Buhler
- Laboratory of Anthropology, Genetics and Peopling history (AGP lab), Department of Genetics and Evolution - Anthropology Unit, University of Geneva, Geneva, Switzerland
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85
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Adamek M, Klages C, Bauer M, Kudlek E, Drechsler A, Leuser B, Scherer S, Opelz G, Tran TH. Seven novel HLA alleles reflect different mechanisms involved in the evolution of HLA diversity: description of the new alleles and review of the literature. Hum Immunol 2014; 76:30-5. [PMID: 25500251 DOI: 10.1016/j.humimm.2014.12.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Revised: 05/22/2014] [Accepted: 12/03/2014] [Indexed: 10/24/2022]
Abstract
The human leukocyte antigen (HLA) loci are among the most polymorphic genes in the human genome. The diversity of these genes is thought to be generated by different mechanisms including point mutation, gene conversion and crossing-over. During routine HLA typing, we discovered seven novel HLA alleles which were probably generated by different evolutionary mechanisms. HLA-B*41:21, HLA-DQB1*02:10 and HLA-DQA1*01:12 likely emerged from the common alleles of their groups by point mutations, all of which caused non-synonymous amino acid substitutions. In contrast, a deletion of one nucleotide leading to a frame shift with subsequent generation of a stop codon is responsible for the appearance of a null allele, HLA-A*01:123N. Whereas HLA-B*35:231 and HLA-B*53:31 were probably products of intralocus gene conversion between HLA-B alleles, HLA-C*07:294 presumably evolved by interlocus gene conversion between an HLA-C and an HLA-B allele. Our analysis of these novel alleles illustrates the different mechanisms which may have contributed to the evolution of HLA polymorphism.
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Affiliation(s)
- Martina Adamek
- Department of Transplantation Immunology, Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Cornelia Klages
- Department of Transplantation Immunology, Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Manuela Bauer
- Department of Transplantation Immunology, Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Evelina Kudlek
- Department of Transplantation Immunology, Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Alina Drechsler
- Department of Transplantation Immunology, Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Birte Leuser
- Department of Transplantation Immunology, Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Sabine Scherer
- Department of Transplantation Immunology, Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Gerhard Opelz
- Department of Transplantation Immunology, Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Thuong Hien Tran
- Department of Transplantation Immunology, Institute of Immunology, University of Heidelberg, Heidelberg, Germany.
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86
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Sanchez-Mazas A, Meyer D. The relevance of HLA sequencing in population genetics studies. J Immunol Res 2014; 2014:971818. [PMID: 25126587 PMCID: PMC4122113 DOI: 10.1155/2014/971818] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 06/20/2014] [Indexed: 11/18/2022] Open
Abstract
Next generation sequencing (NGS) is currently being adapted by different biotechnological platforms to the standard typing method for HLA polymorphism, the huge diversity of which makes this initiative particularly challenging. Boosting the molecular characterization of the HLA genes through efficient, rapid, and low-cost technologies is expected to amplify the success of tissue transplantation by enabling us to find donor-recipient matching for rare phenotypes. But the application of NGS technologies to the molecular mapping of the MHC region also anticipates essential changes in population genetic studies. Huge amounts of HLA sequence data will be available in the next years for different populations, with the potential to change our understanding of HLA variation in humans. In this review, we first explain how HLA sequencing allows a better assessment of the HLA diversity in human populations, taking also into account the methodological difficulties it introduces at the statistical level; secondly, we show how analyzing HLA sequence variation may improve our comprehension of population genetic relationships by facilitating the identification of demographic events that marked human evolution; finally, we discuss the interest of both HLA and genome-wide sequencing and genotyping in detecting functionally significant SNPs in the MHC region, the latter having also contributed to the makeup of the HLA molecular diversity observed today.
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Affiliation(s)
- Alicia Sanchez-Mazas
- Department of Genetics and Evolution—Anthropology Unit, University of Geneva and Institute of Genetics and Genomics of Geneva (IGE3), 12 Rue Gustave-Revilliod, 1211 Geneva 4, Switzerland
| | - Diogo Meyer
- Department of Genetics and Evolutionary Biology, University of São Paulo, Rua do Matão 277, São Paulo, SP 05508-090, Brazil
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87
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Levin AM, Adrianto I, Datta I, Iannuzzi MC, Trudeau S, McKeigue P, Montgomery CG, Rybicki BA. Performance of HLA allele prediction methods in African Americans for class II genes HLA-DRB1, -DQB1, and -DPB1. BMC Genet 2014; 15:72. [PMID: 24935557 PMCID: PMC4074844 DOI: 10.1186/1471-2156-15-72] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 06/11/2014] [Indexed: 12/23/2022] Open
Abstract
Background The expense of human leukocyte antigen (HLA) allele genotyping has motivated the development of imputation methods that use dense single nucleotide polymorphism (SNP) genotype data and the region’s haplotype structure, but the performance of these methods in admixed populations (such as African Americans) has not been adequately evaluated. We compared genotype-based—derived from both genome-wide genotyping and targeted sequencing—imputation results to existing allele data for HLA–DRB1, −DQB1, and –DPB1. Results In European Americans, the newly-developed HLA Genotype Imputation with Attribute Bagging (HIBAG) method outperformed HLA*IMP:02. In African Americans, HLA*IMP:02 performed marginally better than HIBAG pre-built models, but HIBAG models constructed using a portion of our African American sample with both SNP genotyping and four-digit HLA class II allele typing had consistently higher accuracy than HLA*IMP:02. However, HIBAG was significantly less accurate in individuals heterozygous for local ancestry (p ≤0.04). Accuracy improved in models with equal numbers of African and European chromosomes. Variants added by targeted sequencing and SNP imputation further improved both imputation accuracy and the proportion of high quality calls. Conclusion Combining the HIBAG approach with local ancestry and dense variant data can produce highly-accurate HLA class II allele imputation in African Americans.
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Affiliation(s)
- Albert M Levin
- Department of Public Health Sciences, Henry Ford Health System, 1 Ford Place, 3E, 48202 Detroit, MI, USA.
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88
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Nunes JM, Buhler S, Roessli D, Sanchez-Mazas A. TheHLA-net GENE[RATE]pipeline for effective HLA data analysis and its application to 145 population samples from Europe and neighbouring areas. ACTA ACUST UNITED AC 2014; 83:307-23. [DOI: 10.1111/tan.12356] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- J. M. Nunes
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution; Anthropology Unit and Institute of Genetics and Genomics in Geneva (IGE3), University of Geneva; Geneva Switzerland
| | - S. Buhler
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution; Anthropology Unit and Institute of Genetics and Genomics in Geneva (IGE3), University of Geneva; Geneva Switzerland
| | - D. Roessli
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution; Anthropology Unit and Institute of Genetics and Genomics in Geneva (IGE3), University of Geneva; Geneva Switzerland
| | - A. Sanchez-Mazas
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution; Anthropology Unit and Institute of Genetics and Genomics in Geneva (IGE3), University of Geneva; Geneva Switzerland
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89
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Fabreti-Oliveira RA, Nascimento E, Fonseca CG, Santos MA. The heterogeneous HLA genetic composition of the Brazilian population and its relevance to the optimization of hematopoietic stem cell donor recruitment. ACTA ACUST UNITED AC 2014; 84:187-97. [DOI: 10.1111/tan.12352] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2013] [Revised: 02/20/2014] [Accepted: 03/17/2014] [Indexed: 01/05/2023]
Affiliation(s)
- R. A. Fabreti-Oliveira
- Departamento de Bioquímica e Imunologia; Universidade Federal de Minas Gerais; Belo Horizonte MG Brazil
- Departamento da Ciência da Computação; Universidade Federal de Minas Gerais; Belo Horizonte MG Brazil
- IMUNOLAB - Laboratório de Histocompatibilidade; Imunogenética e Imunologia de Transplantes; Belo Horizonte MG Brazil
| | - E. Nascimento
- IMUNOLAB - Laboratório de Histocompatibilidade; Imunogenética e Imunologia de Transplantes; Belo Horizonte MG Brazil
- Instituto de Ensino; Pesquisas e Clínica de Transplantes do Hospital Santa Casa de Belo Horizonte; Belo Horizonte MG Brazil
| | - C. G. Fonseca
- Departamento de Biologia Geral; Universidade Federal de Minas Gerais; Belo Horizonte MG Brazil
| | - M. A. Santos
- Departamento da Ciência da Computação; Universidade Federal de Minas Gerais; Belo Horizonte MG Brazil
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90
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Di D, Sanchez-Mazas A. HLA variation reveals genetic continuity rather than population group structure in East Asia. Immunogenetics 2014; 66:153-60. [PMID: 24449274 DOI: 10.1007/s00251-014-0757-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Accepted: 01/07/2014] [Indexed: 01/15/2023]
Abstract
Genetic differences between Northeast Asian (NEA) and Southeast Asian (SEA) populations have been observed in numerous studies. At the among-population level, despite a clear north-south differentiation observed for many genetic markers, debates were led between abrupt differences and a continuous pattern. At the within-population level, whether NEA or SEA populations have higher genetic diversity is also highly controversial. In this study, we analyzed a large set of HLA data from East Asia in order to map the genetic variation among and within populations in this continent and to clarify the distribution pattern of HLA lineages and alleles. We observed a genetic differentiation between NEA and SEA populations following a continuous pattern from north to south, and we show a significant and continuous decrease of HLA diversity by the same direction. This continuity is shaped by clinal distributions of many HLA lineages and alleles with increasing or decreasing frequencies along the latitude. These results bring new evidence in favor of the "overlapping model" proposed previously for East Asian peopling history, whereby modern humans migrated eastward from western Eurasia via two independent routes along each side of the Himalayas and, later, overlapped in East Asia across open land areas. Our study strongly suggests that intensive gene flow between NEA and SEA populations occurred and shaped the latitude-related continuous pattern of genetic variation and the peculiar HLA lineage and allele distributions observed in this continent. Probably for a very long period, the exact duration of these events remains to be estimated.
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Affiliation(s)
- Da Di
- Laboratory of Anthropology, Genetics and Peopling History (AGP lab), Anthropology Unit, Department of Genetics and Evolution, University of Geneva, 12 rue Gustave-Revilliod, CH-1211, Geneva, Switzerland,
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91
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Mussotter T, Bengesser K, Högel J, Cooper DN, Kehrer-Sawatzki H. Population-specific differences in gene conversion patterns between human SUZ12 and SUZ12P are indicative of the dynamic nature of interparalog gene conversion. Hum Genet 2014; 133:383-401. [PMID: 24385046 DOI: 10.1007/s00439-013-1410-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Accepted: 12/08/2013] [Indexed: 11/29/2022]
Abstract
Nonallelic homologous gene conversion (NAHGC) resulting from interparalog recombination without crossover represents an important influence on the evolution of duplicated sequences in the human genome. In 17q11.2, different paralogous sequences mediate large NF1 deletions by nonallelic homologous recombination with crossover (NAHR). Among these paralogs are SUZ12 and its pseudogene SUZ12P which harbour the breakpoints of type-2 (1.2-Mb) NF1 deletions. Such deletions are caused predominantly by mitotic NAHR since somatic mosaicism with normal cells is evident in most patients. Investigating whether SUZ12 and SUZ12P have also been involved in NAHGC, we observed gene conversion tracts between these paralogs in both Africans (AFR) and Europeans (EUR). Since germline type-2 NF1 deletions resulting from meiotic NAHR are very rare, the vast majority of the gene conversion tracts in SUZ12 and SUZ12P are likely to have resulted from mitotic recombination during premeiotic cell divisions of germ cells. A higher number of gene conversion tracts were noted within SUZ12 and SUZ12P in AFR as compared to EUR. Further, the distinctive signature of NAHGC (a high number of SNPs per paralog and a high number of shared SNPs between paralogs), a characteristic of many actively recombining paralogs, was observed in both SUZ12 and SUZ12P but only in AFR and not in EUR. A novel polymorphic 2.3-kb deletion in SUZ12P was identified which exhibited a high allele frequency in EUR. We postulate that this interparalog structural difference, together with low allelic recombination rates, could have caused a reduction in NAHGC between SUZ12 and SUZ12P during human evolution.
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Affiliation(s)
- Tanja Mussotter
- Institute of Human Genetics, University of Ulm, Albert-Einstein-Allee 11, 89081, Ulm, Germany
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92
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Magalon J, Billard-Daufresne LM, Gilbertas C, Hermanche E, Simon S, Lemarie C, Calmels B, Sabatier F, Gamerre M, Picard C, Chabannon C. Assessing the HLA diversity of cord blood units collected from a birth clinic caring for pregnant women in an ethnically diverse metropolitan area. Transfusion 2013; 54:1046-54. [PMID: 23944705 DOI: 10.1111/trf.12379] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 06/26/2013] [Accepted: 06/28/2013] [Indexed: 11/29/2022]
Abstract
BACKGROUND New strategies are emerging in cord blood banking where focusing on birth clinics caring for a high number of mothers belonging to ethnic minorities could offer new possibilities for allotransplantation both for patients of European origin and for patients from ethnic minorities or mixed ancestries. STUDY DESIGN AND METHODS Marseilles Cord Blood Bank works with one university birth clinic caring for a culturally and sociologically diverse population. Stringent French legal restrictions apply to recording the geographic origin of parents. To circumvent this limitation and evaluate the contribution of newly banked cord blood units (CBUs) to increasing HLA diversity, we applied an algorithm that allows for the determination of parents' putative haplotypes and thus grossly deduce information on their ancestry. Generic resolution HLA-A, HLA-B, and allelic resolution HLA-DRB1 genotyping for 328 CBUs and 2691 unrelated donors (UDs) between January 2009 and May 2012 were performed. Enrichment from international CBU registry with nonreferenced generic HLA-A, HLA-B, and allelic HLA-DRB1 phenotypes was compared between CBUs identified with one or two non-European haplotypes and CBUs identified with two European haplotypes. RESULTS Marseilles CBUs display an increased proportion of HLA antigens frequently expressed in African populations compared to UDs. Whereas 93% of 199 CBUs identified with one or two non-European haplotypes enrich international CBU registry, this result is reduced to 42% for the 129 CBUs identified with two European haplotypes. CONCLUSION This study supports a new method to assess HLA diversity. However, such an increased of HLA diversity raises questions about frequencies of CBUs released and clinical relevance from their uses.
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Affiliation(s)
- Jeremy Magalon
- Cell Therapy Facility, Institut Paoli-Calmettes, Marseille; Cord Blood Bank, Marseille; Inserm CBT-510, Centre d'Investigations Cliniques en Biothérapie, Marseille
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93
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DiGiacomo D, Santonicola A, Zingone F, Troncone E, Caria MC, Borgheresi P, Parrilli G, Ciacci C. Human leukocyte antigen DQ2/8 prevalence in non-celiac patients with gastrointestinal diseases. World J Gastroenterol 2013; 19:2507-2513. [PMID: 23674852 PMCID: PMC3646141 DOI: 10.3748/wjg.v19.i16.2507] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 12/31/2012] [Accepted: 02/07/2013] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the prevalence of human leukocyte antigen (HLA) DQ2/8 alleles in Southern Italians with liver and gastrointestinal (GI) diseases outside of celiac disease.
METHODS: HLA DQ2/8 status was assessed in 443 patients from three ambulatory gastroenterology clinics in Southern Italy (University of Federico II, Naples, Loreto Crispi Hospital, Ruggi D’Aragona Hospital, Salerno). Patients were grouped based on disease status [pre-post transplant liver disease, esophageal/gastric organic and functional diseases, irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD)] and DQ2/8 alleles, which correspond to a celiac disease genetic risk gradient. Subject allele frequencies were compared to healthy Italian controls.
RESULTS: One hundred and ninety-six out of four hundred and forty-three (44.2%) subjects, median age 56 years and 42.6% female, were DQ2/8 positive. When stratifying by disease we found that 86/188 (45.7%) patients with liver disease were HLA DQ2/8 positive, 39/73 (53.4%) with functional upper GI diseases and 19/41 (46.3%) with organic upper GI diseases were positive. Furthermore, 38/105 (36.2%) patients with IBS and 14/36 (38.9%) with IBD were HLA DQ2/8 positive (P = 0.21). Compared to healthy controls those with functional upper GI diseases disorders had a 1.8 times higher odds of DQ2/8 positivity. Those with liver disease had 1.3 times the odds, albeit not statistically significant, of DQ2/8 positivity. Both those with IBS and IBD had a lower odds of DQ2/8 positivity compared to healthy controls.
CONCLUSION: The proportion of individuals HLA DQ2/8 positive is higher in those with liver/upper functional GI disease and lower in IBS/IBD as compared to general population estimates.
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94
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Fürst D, Zollikofer C, Schrezenmeier H, Mytilineos J. TNFA promoter alleles--frequencies and linkage with classical HLA genes in a South German Caucasian population. ACTA ACUST UNITED AC 2013; 80:502-8. [PMID: 23137321 DOI: 10.1111/tan.12025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The tumor necrosis factor alpha (TNFA) promoter region exhibits several polymorphisms, which have been hypothesized to influence gene expression, thereby associating positively or negatively with inflammatory conditions. Many studies have focused on single nucleotide polymorphisms (SNPs) taking not into account additive or inverse effects between different SNPs. We typed 1,021 healthy Caucasian volunteer stem cell donors for their TNFA promoter as well as their HLA-A,-C,-B,-DRB1 loci. Using statistical methods, we reconstructed TNFA promoter alleles and analyzed their frequency and linkage with HLA genes. We show that the number of TNFA promoter alleles frequent enough to be analyzed in clinical studies is limited and that a strong linkage with classical HLA genes is present, especially for the extended HLA-haplotype HLA-A*01:01/HLA-C*07:01/HLA-B*08:01/TNFA promoter allele 3/HLA*DRB1*03:01. Taking into account SNP frequency information, it is possible to quite accurately deduce TNFA promoter alleles by generic Sanger sequencing, obviating the need for elaborating allele-specific sequencing. This information may enable investigators to consider the complete TNFA regulatory region in a phase-separated manner in contrast to previous approaches examining only one or few isolated SNPs.
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Affiliation(s)
- D Fürst
- Institute of Clinical Transfusion Medicine and Immunogenetics, German Red Cross Blood Transfusion Service, Baden Wuerttemberg-Hessen, Ulm, Germany.
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95
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Riccio ME, Buhler S, Nunes JM, Vangenot C, Cuénod M, Currat M, Di D, Andreani M, Boldyreva M, Chambers G, Chernova M, Chiaroni J, Darke C, Di Cristofaro J, Dubois V, Dunn P, Edinur HA, Elamin N, Eliaou JF, Grubic Z, Jaatinen T, Kanga U, Kervaire B, Kolesar L, Kunachiwa W, Lokki ML, Mehra N, Nicoloso G, Paakkanen R, Voniatis DP, Papasteriades C, Poli F, Richard L, Romón Alonso I, Slavčev A, Sulcebe G, Suslova T, Testi M, Tiercy JM, Varnavidou A, Vidan-Jeras B, Wennerström A, Sanchez-Mazas A. 16(th) IHIW: analysis of HLA population data, with updated results for 1996 to 2012 workshop data (AHPD project report). Int J Immunogenet 2012; 40:21-30. [PMID: 23280239 DOI: 10.1111/iji.12033] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2012] [Revised: 11/14/2012] [Accepted: 11/14/2012] [Indexed: 01/05/2023]
Abstract
We present here the results of the Analysis of HLA Population Data (AHPD) project of the 16th International HLA and Immunogenetics Workshop (16IHIW) held in Liverpool in May-June 2012. Thanks to the collaboration of 25 laboratories from 18 different countries, HLA genotypic data for 59 new population samples (either well-defined populations or donor registry samples) were gathered and 55 were analysed statistically following HLA-NET recommendations. The new data included, among others, large sets of well-defined populations from north-east Europe and West Asia, as well as many donor registry data from European countries. The Gene[rate] computer tools were combined to create a Gene[rate] computer pipeline to automatically (i) estimate allele frequencies by an expectation-maximization algorithm accommodating ambiguities, (ii) estimate heterozygosity, (iii) test for Hardy-Weinberg equilibrium (HWE), (iv) test for selective neutrality, (v) generate frequency graphs and summary statistics for each sample at each locus and (vi) plot multidimensional scaling (MDS) analyses comparing the new samples with previous IHIW data. Intrapopulation analyses show that HWE is rarely rejected, while neutrality tests often indicate a significant excess of heterozygotes compared with neutral expectations. The comparison of the 16IHIW AHPD data with data collected during previous workshops (12th-15th) shows that geography is an excellent predictor of HLA genetic differentiations for HLA-A, -B and -DRB1 loci but not for HLA-DQ, whose patterns are probably more influenced by natural selection. In Europe, HLA genetic variation clearly follows a north to south-east axis despite a low level of differentiation between European, North African and West Asian populations. Pacific populations are genetically close to Austronesian-speaking South-East Asian and Taiwanese populations, in agreement with current theories on the peopling of Oceania. Thanks to this project, HLA genetic variation is more clearly defined worldwide and better interpreted in relation to human peopling history and HLA molecular evolution.
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Affiliation(s)
- M E Riccio
- Laboratory of Anthropology, Genetics and Peopling history (AGP lab), University of Geneva, Geneva, Switzerland
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96
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Bronson PG, Mack SJ, Erlich HA, Slatkin M. A sequence-based approach demonstrates that balancing selection in classical human leukocyte antigen (HLA) loci is asymmetric. Hum Mol Genet 2012; 22:252-61. [PMID: 23065702 DOI: 10.1093/hmg/dds424] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Balancing selection has maintained human leukocyte antigen (HLA) allele diversity, but it is unclear whether this selection is symmetric (all heterozygotes are comparable and all homozygotes are comparable in terms of fitness) or asymmetric (distinct heterozygote genotypes display greater fitness than others). We tested the hypothesis that HLA is under asymmetric balancing selection in populations by estimating allelic branch lengths from genetic sequence data encoding peptide-binding domains. Significant deviations indicated changes in the ratio of terminal to internal branch lengths. Such deviations could arise even if no individual alleles present a strikingly altered branch length (e.g. if there is an overall distortion, with all or many terminal branches being longer than expected). DQ and DP loci were also analyzed as haplotypes. Using allele frequencies for 419 distinct populations in 10 geographical regions, we examined population differentiation in alleles within and between regions, and the relationship between allelic branch length and frequency. The strongest evidence for asymmetrical balancing selection was observed for HLA-DRB1, HLA-B and HLA-DPA1, with significant deviation (P ≤ 1.1 × 10(-4)) in about half of the populations. There were significant results at all loci except HLA-DQB1/DQA1. We observed moderate genetic variation within and between geographic regions, similar to the rest of the genome. Branch length was not correlated with allele frequency. In conclusion, sequence data suggest that balancing selection in HLA is asymmetric (some heterozygotes enjoy greater fitness than others). Because HLA polymorphism is crucial for pathogen resistance, this may manifest as a frequency-dependent selection with fluctuation in the fitness of specific heterozygotes over time.
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Affiliation(s)
- Paola G Bronson
- Department of Integrative Biology, University of California, Berkeley, CA 94720-3140, USA.
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97
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Buhler S, Nunes JM, Nicoloso G, Tiercy JM, Sanchez-Mazas A. The heterogeneous HLA genetic makeup of the Swiss population. PLoS One 2012; 7:e41400. [PMID: 22848484 PMCID: PMC3405111 DOI: 10.1371/journal.pone.0041400] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Accepted: 06/25/2012] [Indexed: 12/20/2022] Open
Abstract
This study aims at investigating the HLA molecular variation across Switzerland in order to determine possible regional differences, which would be highly relevant to several purposes: optimizing donor recruitment strategies in hematopoietic stem cell transplantation (HSCT), providing reliable reference data in HLA and disease association studies, and understanding the population genetic background(s) of this culturally heterogeneous country. HLA molecular data of more than 20,000 HSCT donors from 9–13 recruitment centers of the whole country were analyzed. Allele and haplotype frequencies were estimated by using new computer tools adapted to the heterogeneity and ambiguity of the data. Non-parametric and resampling statistical tests were performed to assess Hardy-Weinberg equilibrium, selective neutrality and linkage disequilibrium among different loci, both in each recruitment center and in the whole national registry. Genetic variation was explored through genetic distance and hierarchical analysis of variance taking into account both geographic and linguistic subdivisions in Switzerland. The results indicate a heterogeneous genetic makeup of the Swiss population: first, allele frequencies estimated on the whole national registry strongly deviate from Hardy-Weinberg equilibrium, by contrast with the results obtained for individual centers; second, a pronounced differentiation is observed for Ticino, Graubünden, and, to a lesser extent, Wallis, suggesting that the Alps represent(ed) a barrier to gene flow; finally, although cultural (linguistic) boundaries do not represent a main genetic differentiation factor in Switzerland, the genetic relatedness between population from south-eastern Switzerland and Italy agrees with historical and linguistic data. Overall, this study justifies the maintenance of a decentralized donor recruitment structure in Switzerland allowing increasing the genetic diversity of the national—and hence global—donor registry. It also indicates that HLA data of local donor recruitment centers can be used as reference data in both epidemiological and population genetic studies focusing on the genetic history of present European populations.
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Affiliation(s)
- Stéphane Buhler
- Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution-Anthropology Unit, University of Geneva, Geneva, Switzerland.
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98
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Lima-Junior JC, Rodrigues-da-Silva RN, Banic DM, Jiang J, Singh B, Fabrício-Silva GM, Porto LCS, Meyer EVS, Moreno A, Rodrigues MM, Barnwell JW, Galinski MR, de Oliveira-Ferreira J. Influence of HLA-DRB1 and HLA-DQB1 alleles on IgG antibody response to the P. vivax MSP-1, MSP-3α and MSP-9 in individuals from Brazilian endemic area. PLoS One 2012; 7:e36419. [PMID: 22649493 PMCID: PMC3359319 DOI: 10.1371/journal.pone.0036419] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Accepted: 04/01/2012] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND The antibody response generated during malaria infections is of particular interest, since the production of specific IgG antibodies is required for acquisition of clinical immunity. However, variations in antibody responses could result from genetic polymorphism of the HLA class II genes. Given the increasing focus on the development of subunit vaccines, studies of the influence of class II alleles on the immune response in ethnically diverse populations is important, prior to the implementation of vaccine trials. METHODS AND FINDINGS In this study, we evaluated the influence of HLA-DRB1* and -DQB1* allelic groups on the naturally acquired humoral response from Brazilian Amazon individuals (n = 276) against P. vivax Merozoite Surface Protein-1 (MSP-1), MSP-3α and MSP-9 recombinant proteins. Our results provide information concerning these three P. vivax antigens, relevant for their role as immunogenic surface proteins and vaccine candidates. Firstly, the studied population was heterogeneous presenting 13 HLA-DRB1* and 5 DQB1* allelic groups with a higher frequency of HLA-DRB1*04 and HLA-DQB1*03. The proteins studied were broadly immunogenic in a naturally exposed population with high frequency of IgG antibodies against PvMSP1-19 (86.7%), PvMSP-3 (77%) and PvMSP-9 (76%). Moreover, HLA-DRB1*04 and HLA-DQB1*03 alleles were associated with a higher frequency of IgG immune responses against five out of nine antigens tested, while HLA-DRB1*01 was associated with a high frequency of non-responders to repetitive regions of PvMSP-9, and the DRB1*16 allelic group with the low frequency of responders to PvMSP3 full length recombinant protein. CONCLUSIONS HLA-DRB1*04 alleles were associated with high frequency of antibody responses to five out of nine recombinant proteins tested in Rondonia State, Brazil. These features could increase the success rate of future clinical trials based on these vaccine candidates.
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Affiliation(s)
- Josué C. Lima-Junior
- Laboratory of Immunoparasitology, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
- Center for Technological Development in Health (CDTS), Oswaldo Cruz Foundation (Fiocruz), Rio de Janeiro, Brazil
| | | | - Dalma M. Banic
- Laboratório de Simulídeos e Oncocercose, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Jianlin Jiang
- Emory Vaccine Center, Emory University, Atlanta, Georgia, United States of America
| | - Balwan Singh
- Emory Vaccine Center, Emory University, Atlanta, Georgia, United States of America
| | - Gustavo M. Fabrício-Silva
- Histocompatibility and Cryopreservation Laboratory, Rio de Janeiro State University, Rio de Janeiro, Brazil
| | - Luís C. S. Porto
- Histocompatibility and Cryopreservation Laboratory, Rio de Janeiro State University, Rio de Janeiro, Brazil
| | - Esmeralda V. S. Meyer
- Laboratório de Simulídeos e Oncocercose, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
- Emory Vaccine Center, Emory University, Atlanta, Georgia, United States of America
| | - Alberto Moreno
- Emory Vaccine Center, Emory University, Atlanta, Georgia, United States of America
- Division of Infectious Diseases, Emory University School of Medicine, Atlanta, Georgia, United States of America
| | - Maurício M. Rodrigues
- Centro de Terapia Celular e Molecular (CTCMol), Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, Brazil
| | - John W. Barnwell
- Division of Parasitic Diseases, CDC/National Center for Infectious Diseases, Atlanta, Georgia, United States of America
| | - Mary R. Galinski
- Emory Vaccine Center, Emory University, Atlanta, Georgia, United States of America
- Division of Infectious Diseases, Emory University School of Medicine, Atlanta, Georgia, United States of America
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Krithika S, Valladares-Salgado A, Peralta J, Escobedo-de La Peña J, Kumate-Rodríguez J, Cruz M, Parra EJ. Evaluation of the imputation performance of the program IMPUTE in an admixed sample from Mexico City using several model designs. BMC Med Genomics 2012; 5:12. [PMID: 22549150 PMCID: PMC3436779 DOI: 10.1186/1755-8794-5-12] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Accepted: 05/01/2012] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND We explored the imputation performance of the program IMPUTE in an admixed sample from Mexico City. The following issues were evaluated: (a) the impact of different reference panels (HapMap vs. 1000 Genomes) on imputation; (b) potential differences in imputation performance between single-step vs. two-step (phasing and imputation) approaches; (c) the effect of different INFO score thresholds on imputation performance and (d) imputation performance in common vs. rare markers. METHODS The sample from Mexico City comprised 1,310 individuals genotyped with the Affymetrix 5.0 array. We randomly masked 5% of the markers directly genotyped on chromosome 12 (n=1,046) and compared the imputed genotypes with the microarray genotype calls. Imputation was carried out with the program IMPUTE. The concordance rates between the imputed and observed genotypes were used as a measure of imputation accuracy and the proportion of non-missing genotypes as a measure of imputation efficacy. RESULTS The single-step imputation approach produced slightly higher concordance rates than the two-step strategy (99.1% vs. 98.4% when using the HapMap phase II combined panel), but at the expense of a lower proportion of non-missing genotypes (85.5% vs. 90.1%). The 1,000 Genomes reference sample produced similar concordance rates to the HapMap phase II panel (98.4% for both datasets, using the two-step strategy). However, the 1000 Genomes reference sample increased substantially the proportion of non-missing genotypes (94.7% vs. 90.1%). Rare variants (<1%) had lower imputation accuracy and efficacy than common markers. CONCLUSIONS The program IMPUTE had an excellent imputation performance for common alleles in an admixed sample from Mexico City, which has primarily Native American (62%) and European (33%) contributions. Genotype concordances were higher than 98.4% using all the imputation strategies, in spite of the fact that no Native American samples are present in the HapMap and 1000 Genomes reference panels. The best balance of imputation accuracy and efficiency was obtained with the 1,000 Genomes panel. Rare variants were not captured effectively by any of the available panels, emphasizing the need to be cautious in the interpretation of association results for imputed rare variants.
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Affiliation(s)
- S Krithika
- Department of Anthropology, University of Toronto at Mississauga, 3359 Mississauga Road North, Mississauga, ON, Canada
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100
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Sanchez-Mazas A, Vidan-Jeras B, Nunes JM, Fischer G, Little AM, Bekmane U, Buhler S, Buus S, Claas FHJ, Dormoy A, Dubois V, Eglite E, Eliaou JF, Gonzalez-Galarza F, Grubic Z, Ivanova M, Lie B, Ligeiro D, Lokki ML, da Silva BM, Martorell J, Mendonça D, Middleton D, Voniatis DP, Papasteriades C, Poli F, Riccio ME, Vlachou MS, Sulcebe G, Tonks S, Nevessignsky MT, Vangenot C, van Walraven AM, Tiercy JM. Strategies to work with HLA data in human populations for histocompatibility, clinical transplantation, epidemiology and population genetics: HLA-NET methodological recommendations. Int J Immunogenet 2012; 39:459-72; quiz 473-6. [PMID: 22533604 PMCID: PMC3533781 DOI: 10.1111/j.1744-313x.2012.01113.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
HLA-NET (a European COST Action) aims at networking researchers working in bone marrow transplantation, epidemiology and population genetics to improve the molecular characterization of the HLA genetic diversity of human populations, with an expected strong impact on both public health and fundamental research. Such improvements involve finding consensual strategies to characterize human populations and samples and report HLA molecular typings and ambiguities; proposing user-friendly access to databases and computer tools and defining minimal requirements related to ethical aspects. The overall outcome is the provision of population genetic characterizations and comparisons in a standard way by all interested laboratories. This article reports the recommendations of four working groups (WG1-4) of the HLA-NET network at the mid-term of its activities. WG1 (Population definitions and sampling strategies for population genetics’ analyses) recommends avoiding outdated racial classifications and population names (e.g. ‘Caucasian’) and using instead geographic and/or cultural (e.g. linguistic) criteria to describe human populations (e.g. ‘pan-European’). A standard ‘HLA-NET POPULATION DATA QUESTIONNAIRE’ has been finalized and is available for the whole HLA community. WG2 (HLA typing standards for population genetics analyses) recommends retaining maximal information when reporting HLA typing results. Rather than using the National Marrow Donor Program coding system, all ambiguities should be provided by listing all allele pairs required to explain each genotype, according to the formats proposed in ‘HLA-NET GUIDELINES FOR REPORTING HLA TYPINGS’. The group also suggests taking into account a preliminary list of alleles defined by polymorphisms outside the peptide-binding sites that may affect population genetic statistics because of significant frequencies. WG3 (Bioinformatic strategies for HLA population data storage and analysis) recommends the use of programs capable of dealing with ambiguous data, such as the ‘gene[rate]’ computer tools to estimate frequencies, test for Hardy–Weinberg equilibrium and selective neutrality on data containing any number and kind of ambiguities. WG4 (Ethical issues) proposes to adopt thorough general principles for any HLA population study to ensure that it conforms to (inter)national legislation or recommendations/guidelines. All HLA-NET guidelines and tools are available through its website http://hla-net.eu.
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