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Lu HF, Chou CH, Lin YJ, Uchiyama S, Terao C, Wang YW, Yang JS, Liu TY, Wong HSC, Chen SCC, Tsai FJ. The genome-wide association study of serum IgE levels demonstrated a shared genetic background in allergic diseases. Clin Immunol 2024; 260:109897. [PMID: 38199299 DOI: 10.1016/j.clim.2024.109897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 12/12/2023] [Accepted: 01/03/2024] [Indexed: 01/12/2024]
Abstract
Immunoglobulin E (IgE) synthessis is highly related to a variety of atopic diseases, and several genome-wide association studies (GWASs) have demonstrated the association between genes and IgE level. In this study, we conducted the largest genome-wide association study of IgE involving a Taiwanese Han population. Eight independent variants exhibited genome-wide significance. Among them, an intronic SNP of CD28, rs1181388, and an intergenic SNP, rs1002957030, on 11q23.2 were identified as novel signals for IgE. Seven of the loci were replicated successfully in a meta-analysis using data on Japanese population. Among all the human leukocyte antigen (HLA) regions, HLA-DQA1*03:02 - HLA-DQB1*03:03 was the most significant haplotype (OR = 1.25, SE = 0.02, FDR = 1.6 × 10-14), corresponding to HLA-DQA1 Asp160 and HLA-DQB1 Leu87 amino acid residues. The genetic correlation showed significance between IgE and allergic diseases including asthma, atopic dermatitis, and pollinosis. IgE PRS was significantly correlated with total IgE levels. Furthermore, the top decile IgE polygenic risk score (PRS) group had the highest risk of asthma for the Taiwan Biobank and Biobank Japan cohorts. IgE PRS may be used to aid in predicting the occurrence of allergic reactions before symptoms occur and biomarkers are detectable. Our study provided a more comprehensive understanding of the impact of genomic variants, including complex HLA alleles, on serum IgE levels.
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Affiliation(s)
- Hsing-Fang Lu
- Department of Medical Research, China Medical University Hospital, Taichung 404327, Taiwan; Laboratory for Statistical and Translational Genetics, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Chen-Hsing Chou
- PhD Program for Health Science and Industry, College of Health Care, China Medical University, Taichung, Taiwan; Department of Health Services Administration, China Medical University, Taichung, Taiwan
| | - Ying-Ju Lin
- Genetic Center, Department of Medical Research, China Medical University Hospital, Taichung, Taiwan; School of Chinese Medicine, China Medical University, Taichung, Taiwan
| | - Shunsuke Uchiyama
- Laboratory for Statistical and Translational Genetics, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Chikashi Terao
- Laboratory for Statistical and Translational Genetics, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan; Clinical Research Center, Shizuoka General Hospital, Shizuoka, Japan; The Department of Applied Genetics, The School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
| | - Yu-Wen Wang
- Department of Medical Research, China Medical University Hospital, Taichung 404327, Taiwan
| | - Jai-Sing Yang
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, 404327, Taiwan
| | - Ting-Yuan Liu
- Department of Medical Research, China Medical University Hospital, Taichung 404327, Taiwan
| | - Henry Sung-Ching Wong
- Graduate Institute of Biomedical Informatics, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan
| | - Sean Chun-Chang Chen
- Graduate Institute of Biomedical Informatics, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan
| | - Fuu-Jen Tsai
- Department of Medical Research, China Medical University Hospital, Taichung 404327, Taiwan; School of Chinese Medicine, China Medical University, Taichung, Taiwan; Department of Biotechnology and Bioinformatics, Asia University, Taichung, Taiwan.
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Zheng L, Li X, Song Q, Hou C, Chen X, Li B. PAI-1 Gene Polymorphism Was Associated with an Increased Risk of Allergic Diseases: Evidence from a Meta-Analysis of 14 Case-Control Studies. Int Arch Allergy Immunol 2019; 180:255-263. [PMID: 31574527 DOI: 10.1159/000502522] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 08/06/2019] [Indexed: 11/19/2022] Open
Abstract
INTRODUCTION In recent years, many studies have focused on the association between plasminogen activator inhibitor (PAI)-1 gene 4G/5G polymorphism and risk of allergic diseases, but the results have been inconclusive. OBJECTIVE We conducted this meta-analysis to study the exact relationship between PAI-1 polymorphism and susceptibility to allergic diseases. METHODS All eligible studies were determined by an electronic literature search. Odds ratios (ORs) with 95% confidence intervals (CIs) were used to assess the strength of association under all of the models. RESULTS A total of 14 studies involving 2,327 cases and 2,838 controls were included in this meta-analysis. Overall, we found a significant association between PAI-1 polymorphism and risk of allergic diseases (4G/4G + 4G/5G vs. 5G/5G: OR 1.76, 95% CI 1.39-2.22, p < 0.00001). In a subgroup analysis by ethnicity, we found a markedly increased risk in Asians (OR 1.62, 95% CI 1.26-2.09, p = 0.0002) and Caucasians (OR 1.78, 95% CI 1.26-2.52, p = 0.001). In addition, significant associations between PAI-1 polymorphism and risk of allergic diseases were observed in both adults (OR 1.71, 95% CI 1.23-2.38, p = 0.001) and children (OR 1.87, 95% CI 1.42-2.46, p < 0.00001). In a subgroup analysis by different allergic diseases, a significantly increased risk was found for asthma (OR 1.78, 95% CI 1.33-2.39, p = 0.001) but not for rhinitis (OR 1.51, 95% CI 0.79-2.89, p = 0.22). CONCLUSION This meta-analysis demonstrated that PAI-1 gene 4G/5G polymorphism was associated with an increased risk of allergic diseases.
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Affiliation(s)
- Lei Zheng
- Department of Respiratory Medicine, Ningbo No. 7 Hospital, Ningbo, China
| | - Xiuhong Li
- Department of Respiratory Medicine, Ningbo No. 7 Hospital, Ningbo, China
| | - Qingzhong Song
- Department of Respiratory Medicine, Ningbo No. 7 Hospital, Ningbo, China
| | - Cheng Hou
- Department of Respiratory Medicine, Ningbo No. 7 Hospital, Ningbo, China
| | - Xinlian Chen
- Department of Emergency Medicine, Ningbo No. 7 Hospital, Ningbo, China,
| | - Bo Li
- Department of Respiratory Medicine, Ningbo No. 7 Hospital, Ningbo, China
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Personalized Medicine. Respir Med 2017. [DOI: 10.1007/978-3-319-43447-6_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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An Exploratory Pilot Study of Genetic Marker for IgE-Mediated Allergic Diseases with Expressions of FcεR1α and Cε. Int J Mol Sci 2015; 16:9504-19. [PMID: 25923080 PMCID: PMC4463601 DOI: 10.3390/ijms16059504] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 04/10/2015] [Accepted: 04/20/2015] [Indexed: 12/19/2022] Open
Abstract
The high affinity immunoglobulin E (IgE) receptor-FcεR1 is mainly expressed on the surface of effector cells. Cross-linking of IgE Abs bound to FcεR1 by multi-valent antigens can induce the activation of these cells and the secretion of inflammatory mediators. Since FcεR1 plays a central role in the induction and maintenance of allergic responses, this study aimed to investigate the association of FcεR1 with the allergic phenotype of Cε expression and cytokine and histamine release from peripheral leukocytes. Peripheral leukocytes from 67 allergic and 50 non-allergic subjects were used for genotyping analysis. Peripheral mononuclear cells (PBMCs) were used for Cε expression and ELISpot analysis, while polymorphonuclear cells (PMNs) were used for histamine release. The association between genotype polymorphism of the FcεR1α promoter region (rs2427827 and rs2251746) and allergic features of Cε expression and histamine were analyzed, and their effects on leukocytes function were compared with wild type. The genotype polymorphisms of FcεR1α promoter region with CT and TT in rs2427827 and TC in rs2251746 were significantly higher in allergic patients than in non-allergic controls. Patients with single nucleotide polymorphism (SNP) of FcεR1α promoter region had high levels of total IgE, mite-specific Der p 2 (Group 2 allergen of Dermatophagoides pteronyssinus)-specific IgE and IgE secretion B cells. The mRNA expression of FcεR1α was significantly increased after Der p2 stimulation in PBMCs with SNPs of the FcεR1α promoter region. Despite the increased Cε mRNA expression in PBMCs and histamine release from PMNs and the up-regulated mRNA expression of interleukin (IL)-6 and IL-8 secretions after Der p2 stimulation, there was no statistically significant difference between SNPs of the FcεR1α promoter region and the wild type. SNPs of FcεR1α promoter region were associated with IgE expression, IgE producing B cells, and increased Der p2-induced FcεR1α mRNA expression. These SNPs may be used as a disease marker for IgE-mediated allergic inflammation caused by Dermatophagoides pteronyssinus.
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Potaczek DP. Links between allergy and cardiovascular or hemostatic system. Int J Cardiol 2013; 170:278-85. [PMID: 24315352 DOI: 10.1016/j.ijcard.2013.11.029] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Revised: 11/03/2013] [Accepted: 11/17/2013] [Indexed: 12/28/2022]
Abstract
In addition to a well-known immunologic background of atherosclerosis and influences of inflammation on arterial and venous thrombosis, there is growing evidence for the presence of links between allergy and vascular or thrombotic disorders. In this interpretative review, five pretty well-documented areas of such overlap are described and discussed, including: (1) links between atherosclerosis and immunoglobulin E or atopy, (2) mutual effects of blood lipids and allergy, (3) influence of atopy and related disorders on venous thromboembolism, (4) the role of platelets in allergic diseases, and (5) the functions of protein C system in atopic disorders.
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Affiliation(s)
- Daniel P Potaczek
- Institute of Laboratory Medicine, Philipps-Universität Marburg, Marburg, Germany; John Paul II Hospital, Krakow, Poland.
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Gusareva ES, Kurey I, Grekov I, Lipoldová M. Genetic regulation of immunoglobulin E level in different pathological states: integration of mouse and human genetics. Biol Rev Camb Philos Soc 2013; 89:375-405. [DOI: 10.1111/brv.12059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2012] [Revised: 06/14/2013] [Accepted: 07/31/2013] [Indexed: 12/22/2022]
Affiliation(s)
- Elena S. Gusareva
- Institute of Molecular Genetics; Academy of Sciences of the Czech Republic; Prague 4 Czech Republic
| | - Iryna Kurey
- Institute of Molecular Genetics; Academy of Sciences of the Czech Republic; Prague 4 Czech Republic
| | - Igor Grekov
- Institute of Molecular Genetics; Academy of Sciences of the Czech Republic; Prague 4 Czech Republic
| | - Marie Lipoldová
- Institute of Molecular Genetics; Academy of Sciences of the Czech Republic; Prague 4 Czech Republic
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Kim JH, Cheong HS, Park JS, Jang AS, Uh ST, Kim YH, Kim MK, Choi IS, Cho SH, Choi BW, Bae JS, Park CS, Shin HD. A genome-wide association study of total serum and mite-specific IgEs in asthma patients. PLoS One 2013; 8:e71958. [PMID: 23967269 PMCID: PMC3742455 DOI: 10.1371/journal.pone.0071958] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Accepted: 07/08/2013] [Indexed: 12/21/2022] Open
Abstract
Immunoglobulin E (IgE) is one of the central players in asthma and allergic diseases. Although the serum IgE level, a useful endophenotype, is generally increased in patients with asthma, genetic factors influencing IgE regulation in asthma are still not fully understood. To identify the genetic variations associated with total serum and mite-specific IgEs in asthmatics, a genome-wide association study (GWAS) of 657,366 single nucleotide polymorphisms (SNPs) was performed in 877 Korean asthmatics. This study found that several new genes might be associated with total IgE in asthmatics, such as CRIM1 (rs848512, P = 1.18×10−6; rs711254, P = 6.73×10−6), ZNF71 (rs10404342, P = 7.60×10−6), TLN1 (rs4879926, P = 7.74×10−6), and SYNPO2 (rs1472066, P = 8.36×10−6; rs1038770, P = 8.66×10−6). Regarding the association of specific IgE to house dust mites, it was observed that intergenic SNPs nearby to OPRK1 and LOC730217 might be associated with Dermatophagoides pteronyssinus (D.p.) and Dermatophagoides farinae (D.f.) in asthmatics, respectively. In further pathway analysis, the phosphatidylinositol signaling system and adherens junction pathways were estimated to play a role in the regulation of total IgE levels in asthma. Although functional evaluations and replications of these results in other populations are needed, this GWAS of serum IgE in asthmatics could facilitate improved understanding of the role of the newly identified genetic variants in asthma and its related phenotypes.
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Affiliation(s)
- Jeong-Hyun Kim
- Department of Life Science, Sogang University, Seoul, Republic of Korea
- Research Institute for Basic Science, Sogang University, Seoul, Republic of Korea
| | - Hyun Sub Cheong
- Department of Genetic Epidemiology, SNP Genetics Inc., Seoul, Republic of Korea
| | - Jong Sook Park
- Division of Allergy and Respiratory Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Republic of Korea
| | - An-Soo Jang
- Division of Allergy and Respiratory Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Republic of Korea
| | - Soo-Taek Uh
- Division of Allergy and Respiratory Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Republic of Korea
| | - Yong-Hoon Kim
- Division of Allergy and Respiratory Disease, Soonchunhyang University Cheonan Hospital, Cheonan, Republic of Korea
| | - Mi-Kyeong Kim
- Division of Internal Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Inseon S. Choi
- Department of Allergy, Chonnam National University, Gwangju, Republic of Korea
| | - Sang Heon Cho
- Department of Internal Medicine and Institute of Allergy and Clinical Immunology, Seoul National University, Seoul, Republic of Korea
| | - Byoung Whui Choi
- Department of Internal Medicine, Chung-Ang University Yongsan Hospital, Seoul, Republic of Korea
| | - Joon Seol Bae
- Department of Life Science, Sogang University, Seoul, Republic of Korea
| | - Choon-Sik Park
- Division of Allergy and Respiratory Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Republic of Korea
- * E-mail: (HDS); (CSP)
| | - Hyoung Doo Shin
- Department of Life Science, Sogang University, Seoul, Republic of Korea
- Department of Genetic Epidemiology, SNP Genetics Inc., Seoul, Republic of Korea
- Research Institute for Basic Science, Sogang University, Seoul, Republic of Korea
- * E-mail: (HDS); (CSP)
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Potaczek DP, Kabesch M. Current concepts of IgE regulation and impact of genetic determinants. Clin Exp Allergy 2013; 42:852-71. [PMID: 22909159 DOI: 10.1111/j.1365-2222.2011.03953.x] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Immunoglobulin E (IgE) mediated immune responses seem to be directed against parasites and neoplasms, but are best known for their involvement in allergies. The IgE network is tightly controlled at different levels as outlined in this review. Genetic determinants were suspected to influence IgE regulation and IgE levels considerably for many years. Linkage and candidate gene studies suggested a number of loci and genes to correlate with total serum IgE levels, and recently genome-wide association studies (GWAS) provided the power to identify genetic determinants for total serum IgE levels: 1q23 (FCER1A), 5q31 (RAD50, IL13, IL4), 12q13 (STAT6), 6p21.3 (HLA-DRB1) and 16p12 (IL4R, IL21R). In this review, we analyse the potential role of these GWAS hits in the IgE network and suggest mechanisms of how genes and genetic variants in these loci may influence IgE regulation.
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Affiliation(s)
- D P Potaczek
- Department of Pediatric Pneumology, Allergy and Neonatology, Hannover Medical School, Hannover, Germany
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Denlinger LC, Manthei DM, Seibold MA, Ahn K, Bleecker E, Boushey HA, Calhoun WJ, Castro M, Chinchili VM, Fahy JV, Hawkins GA, Icitovic N, Israel E, Jarjour NN, King T, Kraft M, Lazarus SC, Lehman E, Martin RJ, Meyers DA, Peters SP, Sheerar D, Shi L, Sutherland ER, Szefler SJ, Wechsler ME, Sorkness CA, Lemanske RF. P2X7-regulated protection from exacerbations and loss of control is independent of asthma maintenance therapy. Am J Respir Crit Care Med 2012; 187:28-33. [PMID: 23144325 DOI: 10.1164/rccm.201204-0750oc] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE The function of the P2X(7) nucleotide receptor protects against exacerbation in people with mild-intermittent asthma during viral illnesses, but the impact of disease severity and maintenance therapy has not been studied. OBJECTIVES To evaluate the association between P2X(7), asthma exacerbations, and incomplete symptom control in a more diverse population. METHODS A matched P2RX7 genetic case-control was performed with samples from Asthma Clinical Research Network trial participants enrolled before July 2006, and P2X(7) pore activity was determined in whole blood samples as an ancillary study to two trials completed subsequently. MEASUREMENTS AND MAIN RESULTS A total of 187 exacerbations were studied in 742 subjects, and the change in asthma symptom burden was studied in an additional 110 subjects during a trial of inhaled corticosteroids (ICS) dose optimization. African American carriers of the minor G allele of the rs2230911 loss-of-function single nucleotide polymorphism were more likely to have a history of prednisone use in the previous 12 months, with adjustment for ICS and long-acting β(2)-agonists use (odds ratio, 2.7; 95% confidence interval, 1.2-6.2; P = 0.018). Despite medium-dose ICS, attenuated pore function predicted earlier exacerbations in incompletely controlled patients with moderate asthma (hazard ratio, 3.2; confidence interval, 1.1-9.3; P = 0.033). After establishing control with low-dose ICS in patients with mild asthma, those with attenuated pore function had more asthma symptoms, rescue albuterol use, and FEV(1) reversal (P < 0.001, 0.03, and 0.03, respectively) during the ICS adjustment phase. CONCLUSIONS P2X(7) pore function protects against exacerbations of asthma and loss of control, independent of baseline severity and the maintenance therapy.
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Affiliation(s)
- Loren C Denlinger
- University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA.
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The -675 4G/5G polymorphism in plasminogen activator inhibitor-1 gene is associated with risk of asthma: a meta-analysis. PLoS One 2012; 7:e34385. [PMID: 22479620 PMCID: PMC3313978 DOI: 10.1371/journal.pone.0034385] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Accepted: 02/27/2012] [Indexed: 01/23/2023] Open
Abstract
Background A number of studies assessed the association of −675 4G/5G polymorphism in the promoter region of plasminogen activator inhibitor (PAI)-1 gene with asthma in different populations. However, most studies reported inconclusive results. A meta-analysis was conducted to investigate the association between polymorphism in the PAI-1 gene and asthma susceptibility. Methods Databases including Pubmed, EMBASE, HuGE Literature Finder, Wanfang Database, China National Knowledge Infrastructure (CNKI) and Weipu Database were searched to find relevant studies. Odds ratios (ORs) with 95% confidence intervals (CIs) were used to assess the strength of association in the dominant model, recessive model, codominant model, and additive model. Results Eight studies involving 1817 cases and 2327 controls were included. Overall, significant association between 4G/5G polymorphism and asthma susceptibility was observed for 4G4G+4G5G vs. 5G5G (OR = 1.56, 95% CI 1.12–2.18, P = 0.008), 4G/4G vs. 4G/5G+5G/5G (OR = 1.38, 95% CI 1.06–1.80, P = 0.02), 4G/4G vs. 5G/5G (OR = 1.80, 95% CI 1.17–2.76, P = 0.007), 4G/5G vs. 5G/5G (OR = 1.40, 95% CI 1.07–1.84, P = 0.02), and 4G vs. 5G (OR = 1.35, 95% CI 1.08–1.68, P = 0.008). Conclusions This meta-analysis suggested that the −675 4G/5G polymorphism of PAI-1 gene was a risk factor of asthma.
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Granada M, Wilk JB, Tuzova M, Strachan DP, Weidinger S, Albrecht E, Gieger C, Heinrich J, Himes BE, Hunninghake GM, Celedón JC, Weiss ST, Cruikshank WW, Farrer LA, Center DM, O’Connor GT. A genome-wide association study of plasma total IgE concentrations in the Framingham Heart Study. J Allergy Clin Immunol 2012; 129:840-845.e21. [PMID: 22075330 PMCID: PMC3293994 DOI: 10.1016/j.jaci.2011.09.029] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Revised: 09/19/2011] [Accepted: 09/27/2011] [Indexed: 10/15/2022]
Abstract
BACKGROUND Atopy and plasma IgE concentration are genetically complex traits, and the specific genetic risk factors that lead to IgE dysregulation and clinical atopy are an area of active investigation. OBJECTIVE We sought to ascertain the genetic risk factors that lead to IgE dysregulation. METHODS A genome-wide association study (GWAS) was performed in 6819 participants from the Framingham Heart Study (FHS). Seventy of the top single nucleotide polymorphisms (SNPs) were selected based on P values and linkage disequilibrium among neighboring SNPs and evaluated in a meta-analysis with 5 independent populations from the Cooperative Health Research in the Region of Augsburg cohort, the British 1958 Birth Cohort, and the Childhood Asthma Management Program cohort. RESULTS Thirteen SNPs located in the region of 3 genes, FCER1A, signal transducer and activator of transcription 6 (STAT6), and IL13, were found to have genome-wide significance in the FHS cohort GWAS. The most significant SNPs from the 3 regions were rs2251746 (FCER1A, P = 2.11 × 10(-12)), rs1059513 (STAT6, P = 2.87 × 10(-8)), and rs1295686 (IL13, P = 3.55 × 10(-8)). Four additional gene regions, HLA-G, HLA-DQA2, HLA-A, and Duffy blood group, chemokine receptor (DARC), reached genome-wide statistical significance in a meta-analysis combining the FHS and replication cohorts, although the DARC association did not appear independent of SNPs in the nearby FCER1A gene. CONCLUSION This GWAS of the FHS cohort has identified genetic loci in HLA genes that might have a role in the pathogenesis of IgE dysregulation and atopy. It also confirmed the association of the known susceptibility loci FCER1A, STAT6, and IL13 for the dysregulation of total IgE.
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Affiliation(s)
- Mark Granada
- The Pulmonary Center, Boston University School of Medicine, Boston, MA
| | - Jemma B. Wilk
- The Pulmonary Center, Boston University School of Medicine, Boston, MA
- Department of Neurology, Boston University School of Medicine, Boston, MA
| | - Marina Tuzova
- The Pulmonary Center, Boston University School of Medicine, Boston, MA
| | - David P. Strachan
- Division of Community Health Science, St George’s, University of London, London SW17 ORE, UK
| | - Stephan Weidinger
- Dept. Of Dermatology and Allergy and ZAUM-Center for Allergy and Environment, Technische Universität München and Helmholtz Zentrum München, Munich, Germany; Dept. of Dermatology, University of Kiel, Kiel, Germany
| | - Eva Albrecht
- Institute of Epidemiology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Christian Gieger
- Institute of Epidemiology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Joachim Heinrich
- Institute of Epidemiology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Blanca E. Himes
- Channing Laboratory, Department of Medicine, Brigham and Women’s Hospital, Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Gary M. Hunninghake
- Channing Laboratory, Department of Medicine, Brigham and Women’s Hospital, Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Juan C. Celedón
- Division of Pediatric Pulmonary Medicine, Allergy and Immunology; Children’s Hospital of Pittsburgh of UPMC; University of Pittsburgh School of Medicine
| | - Scott T. Weiss
- Channing Laboratory, Department of Medicine, Brigham and Women’s Hospital, Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | | | - Lindsay A. Farrer
- Departments of Medicine, Neurology, Ophthalmology, and Genetics and Genomics, Boston University School of Medicine, Departments of Epidemiology and Biostatistics, Boston University School of Public Health, Boston, MA
| | - David M. Center
- The Pulmonary Center, Boston University School of Medicine, Boston, MA
| | - George T. O’Connor
- The Pulmonary Center, Boston University School of Medicine, Boston, MA
- The National Heart, Lung, and Blood Institute’s Framingham Heart Study
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Flohrs K, Brüske I, Thiering E, Rzehak P, Wichmann HE, Heinrich J. Temporal Changes in Total Serum Immunoglobulin E Levels in East German Children and the Effect of Potential Predictors. Int Arch Allergy Immunol 2012; 158:27-34. [DOI: 10.1159/000329855] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Accepted: 05/27/2011] [Indexed: 11/19/2022] Open
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Jin CN, Ma H, Lin Y, Wang JA, Xiang MX. Association between SNP rs1800875, serum chymase and immunoglobulin E levels in patients with coronary heart disease. J Zhejiang Univ Sci B 2011; 12:660-7. [PMID: 21796807 DOI: 10.1631/jzus.b1101008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE The gene for mast cell chymase (CMA1) is an ideal candidate for investigating the genetic predisposition to coronary heart disease (CHD), as activated mast cells have been found to be present in a greater proportion in the shoulder region of atheroma than in normal coronary intimae. Previous studies have indicated that CMA1 promoter polymorphism rs1800875 may be involved in regulating immunoglobulin E (IgE) levels in patients with eczema, and it is associated with the progression of immunoglobulin A nephropathy. METHODS The association between single nucleotide polymorphism (SNP) rs1800875, serum chymase, and serum IgE levels was examined in 175 CHD subjects and 95 non-CHD subjects. RESULTS Statistical analysis indicated no significant difference in allele frequency between CHD and non-CHD. However, a significant association was found between CMA1 genotypes and total IgE levels in CHD subjects. Meanwhile, crossover analysis revealed that, in GG homozygotes, CHD risk was nearly six times higher in those with IgE (U/ml) level <2.58 (natural logarithm conversion), while no association was found with chymase level. CONCLUSIONS Polymorphism rs1800875 of CMA1 may be associated with serum IgE level in CHD subjects, but not with chymase level in both groups. In GG homozygotes, high IgE level is a protective factor against coronary disease.
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Affiliation(s)
- Chun-Na Jin
- Department of Cardiology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China
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Wang QP, Wu KM, Li ZQ, Xue F, Chen W, Ji H, Wang BL. Association between maternal allergic rhinitis and asthma on the prevalence of atopic disease in offspring. Int Arch Allergy Immunol 2011; 157:379-86. [PMID: 22123070 DOI: 10.1159/000328789] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2010] [Accepted: 04/20/2011] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Asthma is a common co-morbidity of allergic rhinitis (AR). The prevalence of these two allergic diseases has increased in China and has been shown to cluster in families independently. This study evaluated the association between maternal AR (presenting with or without asthma) and the allergic conditions in offspring. METHODS Women (n = 592) diagnosed with AR were recruited for this study; 379 patients presented with AR and 213 presented with both AR and asthma. Total serum IgE levels and nasal eosinophil counts were analyzed and correlated with disease presentation. RESULTS The prevalence of allergic conditions in offspring of mothers diagnosed with AR and asthma was significantly higher than the prevalence observed in children born to mothers presenting with AR only. Maternal total serum IgE and eosinophil counts were predictive of atopy in offspring. Children born to mothers presenting with persistent moderate-to-severe AR had the highest risk of developing atopic conditions (OR 6.26, 95% CI 3.26-12.02). Maternal age of 25-30 years at delivery was also associated with a higher risk for the allergic disease in offspring compared to maternal age of 36-40 (OR 2.13, 95% CI 1.31-3.47). CONCLUSIONS The severity of maternal AR, asthma co-morbidity, elevated serum IgE levels and nasal eosinophilia were all associated with an increased risk of offspring developing allergic conditions. Children born to older mothers were protected against developing atopic disease.
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Affiliation(s)
- Qiu-Ping Wang
- Department of Otolaryngology-Head and Neck Surgery, Jinling Hospital, Nanjing, PR China
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15
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Ramasamy A, Curjuric I, Coin LJ, Kumar A, McArdle WL, Imboden M, Leynaert B, Kogevinas M, Schmid-Grendelmeier P, Pekkanen J, Wjst M, Bircher AJ, Sovio U, Rochat T, Hartikainen AL, Balding DJ, Jarvelin MR, Probst-Hensch N, Strachan DP, Jarvis DL. A genome-wide meta-analysis of genetic variants associated with allergic rhinitis and grass sensitization and their interaction with birth order. J Allergy Clin Immunol 2011; 128:996-1005. [PMID: 22036096 DOI: 10.1016/j.jaci.2011.08.030] [Citation(s) in RCA: 145] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Revised: 08/22/2011] [Accepted: 08/29/2011] [Indexed: 01/03/2023]
Abstract
BACKGROUND Hay fever or seasonal allergic rhinitis (AR) is a chronic disorder associated with IgE sensitization to grass. The underlying genetic variants have not been studied comprehensively. There is overwhelming evidence that those who have older siblings have less AR, although the mechanism for this remains unclear. OBJECTIVE We sought to identify common genetic variant associations with prevalent AR and grass sensitization using existing genome-wide association study (GWAS) data and to determine whether genetic variants modify the protective effect of older siblings. METHOD Approximately 2.2 million genotyped or imputed single nucleotide polymorphisms were investigated in 4 large European adult cohorts for AR (3,933 self-reported cases vs 8,965 control subjects) and grass sensitization (2,315 cases vs 10,032 control subjects). RESULTS Three loci reached genome-wide significance for either phenotype. The HLA variant rs7775228, which cis-regulates HLA-DRB4, was strongly associated with grass sensitization and weakly with AR (P(grass) = 1.6 × 10(-9); P(AR) = 8.0 × 10(-3)). Variants in a locus near chromosome 11 open reading frame 30 (C11orf30) and leucine-rich repeat containing 32 (LRRC32), which was previously associated with atopic dermatitis and eczema, were also strongly associated with both phenotypes (rs2155219; P(grass) = 9.4 × 10(-9); P(AR) = 3.8 × 10(-8)). The third genome-wide significant variant was rs17513503 (P(grass) = 1.2 × 10(-8); PAR = 7.4 × 10(-7)) which was located near transmembrane protein 232 (TMEM232) and solute carrier family 25, member 46 (SLC25A46). Twelve further loci with suggestive associations were also identified. Using a candidate gene approach, where we considered variants within 164 genes previously thought to be important, we found variants in 3 further genes that may be of interest: thymic stromal lymphopoietin (TSLP), Toll-like receptor 6 (TLR6) and nucleotide-binding oligomerization domain containing 1 (NOD1/CARD4). We found no evidence for variants that modified the effect of birth order on either phenotype. CONCLUSIONS This relatively large meta-analysis of GWASs identified few loci associated with AR and grass sensitization. No birth order interaction was identified in the current analyses.
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Affiliation(s)
- Adaikalavan Ramasamy
- Respiratory Epidemiology and Public Health, Imperial College, London, United Kingdom
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16
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Voronko OE, Dmitrieva-Zdorova EV, Gabaeva MV, Latysheva EA, Storozhakov GI, Lemza SV, Hobrakova VB, Grigorieva EV, Bodoev NV. M31R and R335C polymorphic variants of the IL8RA gene in Russian and Buryat patients with atopic bronchial asthma. RUSS J GENET+ 2011. [DOI: 10.1134/s1022795411090171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Holt RJ, Zhang Y, Binia A, Dixon AL, Vandiedonck C, Cookson WO, Knight JC, Moffatt MF. Allele-specific transcription of the asthma-associated PHD finger protein 11 gene (PHF11) modulated by octamer-binding transcription factor 1 (Oct-1). J Allergy Clin Immunol 2011; 127:1054-62.e1-2. [PMID: 21320718 DOI: 10.1016/j.jaci.2010.12.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2009] [Revised: 11/26/2010] [Accepted: 12/14/2010] [Indexed: 10/18/2022]
Abstract
BACKGROUND Asthma is a common, chronic inflammatory airway disease of major public health importance with multiple genetic determinants. Previously, we found by positional cloning that PHD finger protein 11 (PHF11) on chromosome 13q14 modifies serum immunoglobulin E (IgE) concentrations and asthma susceptibility. No coding variants in PHF11 were identified. OBJECTIVE Here we investigate the 3 single nucleotide polymorphisms (SNPs) in this gene most significantly associated with total serum IgE levels--rs3765526, rs9526569, and rs1046295--for a role in transcription factor binding. METHODS We used electrophoretic mobility shift assays to examine the effect of the 3 SNPs on transcription factor binding in 3 cell lines relevant to asthma pathogenesis. Relative preferential expression of alleles was investigated by using the allelotyping method. RESULTS Electrophoretic mobility shift assays show that rs1046295 modulates allele-specific binding by the octamer-binding transcription factor 1 (Oct-1). Analysis of the relative expression levels of the 2 alleles of this SNP in heterozygous individuals showed a modest, but highly significant (P = 6.5 × 10(-16)), preferential expression of the A allele consistent with a functional role for rs1046295. CONCLUSION These results suggest a mechanism by which rs1046295 may act as a regulatory variant modulating transcription at this locus and altering asthma susceptibility.
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Affiliation(s)
- Richard J Holt
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom.
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18
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SNPs in the FCER1A gene region show no association with allergic rhinitis in a Han Chinese population. PLoS One 2010; 5:e15792. [PMID: 21209833 PMCID: PMC3013135 DOI: 10.1371/journal.pone.0015792] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Accepted: 11/29/2010] [Indexed: 01/08/2023] Open
Abstract
Background Immunoglobulin E (IgE) is a central player in the allergic response, and raised total IgE levels are considered as an indicator of atopy or potential development of atopy. A recent genome-wide scan in a German population-based cohort of adults identified the gene encoding the alpha chain of the high affinity receptor for IgE (FCER1A) as a susceptibility locus influencing total serum IgE levels. The aim of this study was to investigate whether the polymorphisms in the FCER1A gene are associated with allergic rhinitis (AR) in a Han Chinese population. Methodology/Principal Findings A population of 378 patients with AR and 288 healthy controls was studied. Precise phenotyping of patients was accomplished by means of a questionnaire and clinical examination. Blood was drawn for DNA extraction and total serum immunoglobulin E (IgE) measurement. A total of 16 single nucleotide polymorphisms (SNPs) in FCER1A were selected and individually genotyped. None of the SNPs in the FCER1A showed an association with AR. Similarly, the lack of association was also evident in subgroup analysis for the presence of different allergen sensitivities. None of the selected SNPs in FCER1A was associated with total IgE level. Conclusions Although FCER1A presents itself as a good candidate for contributing to total serum IgE, this study failed to find an association between SNPs in the FCER1A gene region and IgE level or AR susceptibility.
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Arginase 1 and arginase 2 variations associate with asthma, asthma severity and beta2 agonist and steroid response. Pharmacogenet Genomics 2010; 20:179-86. [PMID: 20124949 DOI: 10.1097/fpc.0b013e328336c7fd] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
RATIONALE Arginase probably plays an important role in asthma development, severity and progression. Polymorphisms in arginase 1 and arginase 2 genes have been associated with childhood asthma and FEV1 reversibility to beta2 agonists. OBJECTIVES We investigated the association between arginase 1 and arginase 2 polymorphisms and adult asthma, asthma severity and treatment response in a longitudinal cohort of 200 asthma patients. METHODS Patients were studied during 1962-1975 and reexamined during 1990-1999, together with their families. Longitudinal data on lung function and treatment were extracted from medical records. Associations between haplotype-tagging polymorphisms in arginase 1 (n=3) and arginase 2 (n=8) and asthma, asthma severity, acute response to bronchodilators and chronic response to inhaled corticosteroids were analyzed. MEASUREMENTS AND MAIN RESULTS Two polymorphisms in arginase 2 (rs17249437 and rs3742879) were associated with asthma and with more severe airway obstruction. Increased airway hyperresponsiveness and lower beta2 agonist reversibility, but not anticholinergic reversibility, were associated with both arginase 1 and arginase 2. Inhaled corticosteroids slowed down the annual FEV1 decline, which was significantly less effective in homozygote carriers of the C-allele of the arginase 1 polymorphism, rs2781667. CONCLUSION We show that previously reported associations between arginase polymorphisms and childhood asthma are also present in adult asthma and the previously found associations with lower reversibility are specific for beta2 agonists. Furthermore, we identified associations of arginase 1 and arginase 2 genes with asthma severity, as reflected by a lower lung function, more severe airway hyperresponsiveness, and less long-term response to inhaled corticosteroids. Studies on the functionality of the polymorphisms are warranted to further unravel the complex mechanisms underlying these observations.
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Meta-analysis of 20 genome-wide linkage studies evidenced new regions linked to asthma and atopy. Eur J Hum Genet 2010; 18:700-6. [PMID: 20068594 DOI: 10.1038/ejhg.2009.224] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Asthma is caused by a heterogeneous combination of environmental and genetic factors. In the context of GA2LEN (Global Allergy and Asthma European Network), we carried out meta-analyses of almost all genome-wide linkage screens conducted to date in 20 independent populations from different ethnic origins (>or=3024 families with >or=10 027 subjects) for asthma, atopic asthma, bronchial hyper-responsiveness and five atopy-related traits (total immunoglobulin E level, positive skin test response (SPT) to at least one allergen or to House Dust Mite, quantitative score of SPT (SPTQ) and eosinophils (EOS)). We used the genome scan meta-analysis method to assess evidence for linkage within bins of traditionally 30-cM width, and explored the manner in which these results were affected by bin definition. Meta-analyses were conducted in all studies and repeated in families of European ancestry. Genome-wide evidence for linkage was detected for asthma in two regions (2p21-p14 and 6p21) in European families ascertained through two asthmatic sibs. With regard to atopy phenotypes, four regions reached genome-wide significance: 3p25.3-q24 in all families for SPT and three other regions in European families (2q32-q34 for EOS, 5q23-q33 for SPTQ and 17q12-q24 for SPT). Tests of heterogeneity showed consistent evidence of linkage of SPTQ to 3p11-3q21, whereas between-study heterogeneity was detected for asthma in 2p22-p13 and 6p21, and for atopic asthma in 1q23-q25. This large-scale meta-analysis provides an important resource of information that can be used to prioritize further fine-mapping studies and also be integrated with genome-wide association studies to increase power and better interpret the outcomes of these studies.
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de Guia RM, Ramos JDA. The -590C/TIL4 single-nucleotide polymorphism as a genetic factor of atopic allergy. INTERNATIONAL JOURNAL OF MOLECULAR EPIDEMIOLOGY AND GENETICS 2009; 1:67-73. [PMID: 21537454 PMCID: PMC3076745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/22/2009] [Accepted: 11/20/2009] [Indexed: 05/30/2023]
Abstract
Elevated IgE levels in individuals with asthma, allergic rhinitis, and atopic dermatitis represents a situation in that increased IL4 production seems to occur because of the genetic component of the disease. In this study, one-hundred two matched-pairs of allergic and non-allergic individuals were phenotyped for total serum IgE level using enzyme-linked immunosorbent assay (ELISA). Atopic status was defined by serum IgE concentration ≥100 IU/mL The -590C/T IL4 (rs2243250) was screened by polymerase chain reaction-restriction fragment-length polymorphism (PCR-RFLP) analysis. An association between the IL4 -590 TT genotype and levels of IgE was confirmed in the study population (ANOVA p=0.017). Furthermore, the IL4 T allele was significantly increased in allergic (0.299) compared with non-allergic subjects (0.172) (OR=2.060, 95% 01 = 1.285-3.301, χ(2) uncorrected p=0.002) at total serum IgE cut-off of 100 IU/mL. A significant relationship between IL4 -590 TT genotype and very high IgE levels (>1000 IU/mL) (OR=3.968, 95% CI = 1.499-10.5, χ(2) uncorrected p=0.01624) was also established. The -590C/T IL4 polymorphism is a potential risk factor to and correlates with atopic allergy.
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22
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Gusareva ES, Bragina EJ, Buinova SN, Chernyak BA, Puzyrev VP, Ogorodova LM, Lipoldová M. Chromosome 12q24.3 controls sensitization to cat allergen in patients with asthma from Siberia, Russia. Immunol Lett 2009; 125:1-6. [PMID: 19450622 DOI: 10.1016/j.imlet.2009.05.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Revised: 04/23/2009] [Accepted: 05/04/2009] [Indexed: 01/21/2023]
Abstract
In Russian population of Siberia asthma is usually concomitant with high sensitization to indoor allergens (cat, dog and house dust mites), overproduction of total immunoglobulin E (IgE) and airway hyperreactivity. Definition of genes that predispose to development of various sub-components of the asthma phenotype is important for understanding of etiology of this disease. To map genes predisposing to asthma, we tested 21 microsatellite markers from candidate chromosomal regions in 136 Russian nuclear families with asthma from Siberia. We performed non-parametric analysis for linkage with asthma, total IgE, specific IgE to cat, dog, and dust mites, and spirometric indices (FEV1 (%) - percentage of predicted forced expiratory volume in 1s, FVC (%) - percentage of predicted forced vital capacity, and FEV1/FVC (%) - Tiffenau index). The most significant linkage was to the candidate region on chromosome 12. Locus controlling cat-specific IgE, which is the most abundant in asthma patients from Siberian population, mapped within the interval between 136 and 140 cM on chromosome 12q24.3, with the suggestive linkage at the marker D12S1611 (LOD=2.23, P=0.0007). Total IgE was also linked to this region (D12S1611 - LOD=1.12, P=0.012). FEV1 (%) exceeded LOD>1 threshold for significance with the same locus 12q24.3, but with the peak at a more proximal region at 111.87 cM (D12S338 - LOD=1.21, P=0.009). Some evidence of linkage (LOD>1.0) was also detected for asthma at 6p21.31 (D6S291) and total IgE at 13q14.2 (D13S165). These data indicate that the locus 12q24.3 is the most promising candidate for identification of asthma genes in Russian population of Siberia.
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Affiliation(s)
- Elena S Gusareva
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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23
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Ma Z, Paek D, Oh CK. Plasminogen activator inhibitor-1 and asthma: role in the pathogenesis and molecular regulation. Clin Exp Allergy 2009; 39:1136-44. [PMID: 19438580 DOI: 10.1111/j.1365-2222.2009.03272.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Plasminogen activator inhibitor (PAI)-1 is a major inhibitor of the fibrinolytic system. PAI-1 levels are markedly increased in asthmatic airways, and mast cells (MCs), a pivotal cell type in the pathogenesis of asthma, are one of the main sources of PAI-1 production. Recent studies suggest that PAI-1 may promote the development of asthma by regulating airway remodelling, airway hyperresponsiveness (AHR), and allergic inflammation. The single guanosine nucleotide deletion/insertion polymorphism (4G/5G) at -675 bp of the PAI-1 gene is the major genetic determinant of PAI-1 expression. Plasma PAI-1 level is higher in people with the 4G/4G genotype than in those with the 5G/5G genotype. A strong association between the 4G/5G polymorphism and the risk and the severity of asthma has been suggested. Levels of plasma IgE and PAI-1 and severity of AHR are greater in asthmatic patients with the 4G/4G genotype than in those with the 5G/5G genotype. The PAI-1 promoter with the 4G allele renders higher transcription activity than the PAI-1 promoter with the 5G allele in stimulated MCs. The molecular mechanism for the 4G allele-mediated higher PAI-1 expression is associated with greater binding of upstream stimulatory factor-1 to the E-box adjacent to the 4G site (E-4G) than to the E-5G. In summary, PAI-1 may play an important role in the pathogenesis of asthma. Further studies evaluating the mechanisms of PAI-1 action and regulation may lead to the development of a novel prognostic factor and therapeutic target for the treatment and prevention of asthma and other PAI-1-associated diseases.
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Affiliation(s)
- Z Ma
- Department of Pediatrics, Harbor-UCLA Medical Center, Division of Allergy and Immunology, Torrance, CA, USA
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24
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Tewfik MA, Bossé Y, Lemire M, Hudson TJ, Vallée-Smejda S, Al-Shemari H, Laprise C, Desrosiers M. Polymorphisms in interleukin-1 receptor-associated kinase 4 are associated with total serum IgE. Allergy 2009; 64:746-53. [PMID: 19254290 DOI: 10.1111/j.1398-9995.2008.01889.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND Serum immunoglobulin E (IgE) level is recognized to be under strong genetic control, but the causal and susceptibility genes remain to be identified. We sought to investigate the association between single nucleotide polymorphisms (SNPs) in the Toll-like receptor (TLR) signaling pathway and total serum IgE level. METHODS A population of 206 patients with severe chronic rhinosinusitis (CRS) was used. Precise phenotyping of patients was accomplished by means of a questionnaire and clinical examination. Blood was drawn for measurement of total serum IgE, as well as DNA extraction. A maximally informative set of SNPs in the TLR1, 2, 3, 4, 6, 9, 10, CD14, MD2, MyD88, IRAK4, and TRAF6 genes were selected and genotyped. Significant findings were replicated in a second independent population of 956 subjects from 227 families with asthma. RESULTS A total of 97 out of 104 SNPs were successfully genotyped. Three SNPs in IRAK4--rs1461567, rs4251513, and rs4251559--were associated with total serum IgE levels (P < 0.004). In the replication sample, the same SNPs as well as the same orientation of the risk allele were associated with IgE levels (P < 0.031). CONCLUSIONS These results demonstrate a clear association between polymorphisms in the IRAK4 gene and serum IgE levels in patients with CRS and asthma. IRAK4 may be important in the regulation of IgE levels in patients with inflammatory diseases of the airways.
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Affiliation(s)
- M A Tewfik
- Department of Otolaryngology-Head and Neck Surgery, Montreal General Hospital, McGill University, Montreal, Canada
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25
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Chan IHS, Tang NLS, Leung TF, Huang W, Lam YYO, Wong GWK, Chan JCN, Chan MHM, Wong CK, Zhang YP, Lam CWK. Association of early growth response-1 gene polymorphisms with total IgE and atopy in asthmatic children. Pediatr Allergy Immunol 2009; 20:142-50. [PMID: 18507785 DOI: 10.1111/j.1399-3038.2008.00757.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Early growth response-1 (Egr-1) is expressed in human airways and found to modulate tumor necrosis factor, immunoglobulin E (IgE), airway responsiveness, and interleukin-13-induced inflammation in mice. We investigated the effects of Chinese-tagging single nucleotide polymorphisms (SNPs) of Egr-1 on asthma traits in 298 Chinese asthmatic children and 175 controls, and a replication community cohort of 191 controls. Tag SNP (-4071 A-->G) and three additional SNPs (-1427 C-->T, -151 C-->T and IVS1 -42 C-->T) were genotyped by restriction fragment length polymorphism (RFLP). Significant associations were found between plasma total IgE concentration and -4071 A-->G (p = 0.008) and IVS1 -42 C-->T (p = 0.027) in asthmatic patients. After Bonferroni correction, only -4071 A-->G showed significant association. Multivariate regression analysis confirmed this significant association with a standardized coefficient beta of 0.156 (95% CI: 0.046-0.317; p = 0.009) in asthmatics among the three SNPs with age and gender-adjusted. In -4071 A-->G, IgE(log) was significantly higher in patients with the GG genotype than the AA genotype (p = 0.009). In addition, -4071 A-->G was significantly associated with atopy (p = 0.016) and high total IgE concentration (p = 0.030) among asthmatics. Patients with the G allele had a 3.5-fold risk of having atopy and a 2.0-fold risk of having high total IgE concentration than those homozygous for the A allele. This is the first report to show significant association of Egr-1 polymorphisms with plasma total IgE and atopy in asthmatics. It may help to explore the pharmacogenetics of Egr-1 inhibitors.
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Affiliation(s)
- Iris H S Chan
- Department of Chemical Pathology, The Chinese University of Hong Kong, Hong Kong
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26
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Movahedi M, Mahdaviani SA, Rezaei N, Moradi B, Dorkhosh S, Amirzargar AA. IL-10, TGF-beta, IL-2, IL-12, and IFN-gamma cytokine gene polymorphisms in asthma. J Asthma 2008; 45:790-4. [PMID: 18972297 DOI: 10.1080/02770900802207261] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Asthma is a complex respiratory disease, characterized by airway inflammation and reversible airway obstruction. Both genetic and environmental factors are important in the development and expression of the disease. In order to analyze the genetic profile of Th1 and Th2 cytokines in Iranian asthmatic patients, this study was performed. The allele and genotype frequencies of a number of polymorphic genes coding for IL-10, TGF-beta, IL-2, IL-12, and IFN-gamma were investigated in 60 patients with asthma in comparison with 140 controls. The most frequent genotypes in our patients were IL-10 GA at position-1082 (p = 0.001), IL-10 CT at position -819 (p = 0.001), IL-10 CA at position -592 (p = 0.0001), IL-12 CA at position -1188 (p = 0.003), TGF-beta CG at codon 25 (p = 0.002), IL-2 GT at position -330 (p = 0.004). In contrast, the frequencies of the genotypes IL-10 AA at position -1082 (p = 0.0001) and GG at position -1082 (p = 0.01), IL-10 CC at position -819 (p = 0.001) and TT at position -819 (p = 0.01), TGF-beta TT at codon 10 (p = 0.001), TGF-beta GG at codon 25 (p = 0.005), IL-12 AA at position -1188 (p = 0.004), IL-2 TT at position -330 (p = 0.01) were significantly lower in the patient group. The most frequent haplotypes in the patients were IL-10 GCC (p = 0.008) and ATA (p = 0.0001) at position -1082, -819, -592, and TGF-beta CC (p = 0.036) at codon 10 and codon 25. In contrast, the frequencies of the IL-10 ACC (p = 0.001), TGF-beta TG (p = 0.024), and IL-2 TT (p = 0.001) and GT (p= 0.0001) in the patients were significantly lower than controls. Considering the high frequency of presence of IL-10 ATA haplotype and the IL-2 GT genotype, it seems that the production of IL-10 and IL-2 in the asthmatic patients could be lower than normal subjects.
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Affiliation(s)
- Masoud Movahedi
- Department of Allergy and Clinical Immunology of Children's Medical Center Hospital, Immunology, Asthma and Allergy Research Institute, Medical Sciences/University of Tehran, Tehran, Iran
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27
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Denlinger LC, Shi L, Guadarrama A, Schell K, Green D, Morrin A, Hogan K, Sorkness RL, Busse WW, Gern JE. Attenuated P2X7 pore function as a risk factor for virus-induced loss of asthma control. Am J Respir Crit Care Med 2008; 179:265-70. [PMID: 19201928 DOI: 10.1164/rccm.200802-293oc] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE Upper respiratory tract infection is a guideline accepted risk domain for the loss of asthma control. The ionotrophic nucleotide receptor P2X(7) regulates compartmentalized acute inflammation and the immune response to airway pathogens. OBJECTIVES We hypothesized that variability in P2X(7) function contributes to neutrophilic airway inflammation during a cold and thereby is linked to acute asthma. METHODS Research volunteers with asthma were enrolled at the onset of a naturally occurring cold and monitored through convalescence, assessing symptoms, lung function, and airway inflammation. P2X(7) pore activity in whole blood samples was measured using a genomically validated flow cytometric assay. MEASUREMENTS AND MAIN RESULTS Thirty-five participants with mild to moderate allergic asthma were enrolled and 31 completed all visits. P2X(7) pore function correlated with the change in nasal lavage neutrophil counts during the cold (R(s) = 0.514, P = 0.004) and was inversely related to the change in asthma symptoms (R(s) = -0.486, P = 0.009). The change in peak expiratory flow recordings, precold use of inhaled corticosteroids, and P2X(7) pore function were multivariate predictors of asthma symptoms (P = 0.001, < 0.001 and = 0.003 respectively). Attenuated P2X(7) activity was associated with the risk of losing asthma control (crude odds ratio, 11.0; 95% confidence interval, 1.1-106.4) even after adjustment for inhaled corticosteroids and rhinovirus (odds ratio, 15.0). CONCLUSIONS A whole blood P2X(7) pore assay robustly identifies participants with loss-of-function genotypes. Using this assay as an epidemiologic tool, attenuated P2X(7) pore activity may be a novel biomarker of virus-induced loss of asthma control.
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Affiliation(s)
- Loren C Denlinger
- Section of Allergy, Pulmonary, and Critical Care, Department of Medicine, University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, P.O. Box 9988, Madison, WI 53792, USA.
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28
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Gusareva ES, Havelková H, Blazková H, Kosarová M, Kucera P, Král V, Salyakina D, Müller-Myhsok B, Lipoldová M. Mouse to human comparative genetics reveals a novel immunoglobulin E-controlling locus on Hsa8q12. Immunogenetics 2008; 61:15-25. [PMID: 19015841 DOI: 10.1007/s00251-008-0343-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2008] [Accepted: 10/23/2008] [Indexed: 01/02/2023]
Abstract
Atopy is a predisposition to hyperproduction of immunoglobulin E (IgE) against common environmental allergens. It is often associated with development of allergic diseases such as asthma, rhinitis, and dermatitis. Production of IgE is influenced by genetic and environmental factors. In spite of progress in the study of heredity of atopy, the genetic mechanisms of IgE regulation have not yet been completely elucidated. The analysis of complex traits can benefit considerably from integration of human and mouse genetics. Previously, we mapped a mouse IgE-controlling locus Lmr9 on chromosome 4 to a segment of <9 Mb. In this study, we tested levels of total IgE and 25 specific IgEs against inhalant and food allergens in 67 Czech atopic families. In the position homologous to Lmr9 on chromosome 8q12 marked by D8S285, we demonstrated a novel human IgE-controlling locus exhibiting suggestive linkage to composite inhalant allergic sensitization (limit of detection, LOD = 2.11, P = 0.0009) and to nine specific IgEs, with maximum LOD (LOD = 2.42, P = 0.0004) to plantain. We also tested 16 markers at previously reported chromosomal regions of atopy. Linkage to plant allergens exceeding the LOD > 2.0 was detected at 5q33 (D5S1507, LOD = 2.11, P = 0.0009) and 13q14 (D13S165, LOD = 2.74, P = 0.0002). The significant association with plant allergens (quantitative and discrete traits) was found at 7p14 (D7S2250, corrected P = 0.026) and 12q13 (D12S1298, corrected P = 0.043). Thus, the finding of linkage on chromosome 8q12 shows precision and predictive power of mouse models in the investigation of complex traits in humans. Our results also confirm the role of loci at 5q33, 7p14, 12q14, and 13q13 in control of IgE.
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Affiliation(s)
- Elena S Gusareva
- Department of Molecular and Cellular Immunology, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Vídenská 1083, 142 20, Prague 4, Czech Republic
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Korpi-Steiner NL, Sheerar D, Puffer EB, Urben C, Boyd J, Guadarrama A, Schell K, Denlinger LC. Standardized method to minimize variability in a functional P2X(7) flow cytometric assay for a multi-center clinical trial. CYTOMETRY PART B-CLINICAL CYTOMETRY 2008; 74:319-29. [PMID: 18431793 DOI: 10.1002/cyto.b.20421] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Flow cytometric analysis of human P2X(7) pore activity segregates variant from common P2RX7 genotypes and may serve as a biomarker for cancer, pain, inflammation, and immune responses to infection. Standardization is needed to accommodate variable sample age and instrumentation differences in a multicenter clinical trial. METHODS CD14-PE-stained whole blood samples were treated with YO-PRO-1 combined with a P2X(7) agonist (BzATP) or control, followed by the addition of PI after closure of the P2X(7) pore. Recalled instrument settings from previous publications were used to adapt a standardized fluorescent particle-adjusted set-up method. Experiments were performed to compare the two methods while evaluating components of systematic variability and facilitating reliable processing of samples with varied ages. RESULTS The median YO-PRO-1 fluorescence of BzATP-treated samples had less variability when collected by the bead-adjusted method and was less influenced by the compensation strategy used. The average day-to-day coefficient of variance for assessments of P2X(7) pore activity by this method was 0.11 +/- 0.04, and the exclusion of nonviable cells was found to accommodate samples aged up to 4 days after phlebotomy. The bead-adjusted set-up method produced measurements differing by only 2.0% +/- 1.5% on two analog cytometers, and within similar decades when comparing analog to digital instruments. CONCLUSIONS These results provide a standardized method for quantitative flow cytometric analysis of P2X(7) receptor phenotypes in blood monocytes with minimal intralaboratory variation and potential for interlaboratory comparisons that can greatly facilitate multicenter functional genomic clinical studies.
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Affiliation(s)
- N L Korpi-Steiner
- Department of Medicine-Allergy, Pulmonary & Critical Care, University of Wisconsin-Madison, Madison, WI 53792, USA
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Smith AK, Lange LA, Ampleford EJ, Meyers DA, Bleecker ER, Howard TD. Association of polymorphisms in CASP10 and CASP8 with FEV(1)/FVC and bronchial hyperresponsiveness in ethnically diverse asthmatics. Clin Exp Allergy 2008; 38:1738-44. [PMID: 18823309 DOI: 10.1111/j.1365-2222.2008.03095.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Several chromosomal regions have been identified using family-based linkage analysis to contain genes contributing to the development of asthma and allergic disorders. One of these regions, chromosome 2q32-q33, contains a gene cluster containing CFLAR, CASP10 and CASP8. These genes regulate the extrinsic apoptosis pathway utilized by several types of immune and structural cells that have been implicated in the pathogenesis of asthma. OBJECTIVE To assess the role of genetic variation in CFLAR, CASP10 and CASP8 in asthma and related phenotypes in individuals of diverse ethnic backgrounds. METHODS We tested 26 single nucleotide polymorphisms (SNPs) in the CFLAR, CASP10 and CASP8 gene cluster for association with asthma and related phenotypes in African-American, non-Hispanic whites, and Hispanic case-control populations (cases, N=517, controls, N=644). RESULTS Five CASP10 SNPS were associated with forced expiratory volume in 1 s (FEV(1))/forced expiration volume capacity (FVC) in the African-American subjects with asthma (P=0.0009-0.047). Nine SNPs, seven in CASP10 and two in CASP8, were also associated with the degree of bronchial hyperresponsiveness (BHR) (as determined by PC(20)) in race-specific analysis, predominately in the Non-Hispanic white cases. Two SNPs, rs6750157 in CASP10 and rs1045485 in CASP8 were modestly associated with asthma in the African-American (P=0.025) and Hispanic (P=0.033) populations, respectively. CONCLUSION These data suggest a role for CASP10 as a potential modifier of the asthma phenotype, specifically with measures of airway obstruction and BHR.
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Affiliation(s)
- Alicia K Smith
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, USA
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Weidinger S, Gieger C, Rodriguez E, Baurecht H, Mempel M, Klopp N, Gohlke H, Wagenpfeil S, Ollert M, Ring J, Behrendt H, Heinrich J, Novak N, Bieber T, Krämer U, Berdel D, von Berg A, Bauer CP, Herbarth O, Koletzko S, Prokisch H, Mehta D, Meitinger T, Depner M, von Mutius E, Liang L, Moffatt M, Cookson W, Kabesch M, Wichmann HE, Illig T. Genome-wide scan on total serum IgE levels identifies FCER1A as novel susceptibility locus. PLoS Genet 2008; 4:e1000166. [PMID: 18846228 PMCID: PMC2565692 DOI: 10.1371/journal.pgen.1000166] [Citation(s) in RCA: 205] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2008] [Accepted: 07/15/2008] [Indexed: 11/29/2022] Open
Abstract
High levels of serum IgE are considered markers of parasite and helminth exposure. In addition, they are associated with allergic disorders, play a key role in anti-tumoral defence, and are crucial mediators of autoimmune diseases. Total IgE is a strongly heritable trait. In a genome-wide association study (GWAS), we tested 353,569 SNPs for association with serum IgE levels in 1,530 individuals from the population-based KORA S3/F3 study. Replication was performed in four independent population-based study samples (total n = 9,769 individuals). Functional variants in the gene encoding the alpha chain of the high affinity receptor for IgE (FCER1A) on chromosome 1q23 (rs2251746 and rs2427837) were strongly associated with total IgE levels in all cohorts with P values of 1.85 x 10(-20) and 7.08 x 10(-19) in a combined analysis, and in a post-hoc analysis showed additional associations with allergic sensitization (P = 7.78 x 10(-4) and P = 1.95 x 10(-3)). The "top" SNP significantly influenced the cell surface expression of FCER1A on basophils, and genome-wide expression profiles indicated an interesting novel regulatory mechanism of FCER1A expression via GATA-2. Polymorphisms within the RAD50 gene on chromosome 5q31 were consistently associated with IgE levels (P values 6.28 x 10(-7)-4.46 x 10(-8)) and increased the risk for atopic eczema and asthma. Furthermore, STAT6 was confirmed as susceptibility locus modulating IgE levels. In this first GWAS on total IgE FCER1A was identified and replicated as new susceptibility locus at which common genetic variation influences serum IgE levels. In addition, variants within the RAD50 gene might represent additional factors within cytokine gene cluster on chromosome 5q31, emphasizing the need for further investigations in this intriguing region. Our data furthermore confirm association of STAT6 variation with serum IgE levels.
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Affiliation(s)
- Stephan Weidinger
- Department of Dermatology and Allergy, Technische Universität München, München, Germany.
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Pharmacogenomics and outcome of asthma: no clinical application for long-term steroid effects by CRHR1 polymorphisms. J Allergy Clin Immunol 2008; 121:1510-3. [PMID: 18539200 DOI: 10.1016/j.jaci.2008.04.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2007] [Revised: 02/24/2008] [Accepted: 04/15/2008] [Indexed: 11/23/2022]
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Meta-analysis of genome-wide linkage studies of asthma and related traits. Respir Res 2008; 9:38. [PMID: 18442398 PMCID: PMC2391165 DOI: 10.1186/1465-9921-9-38] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Accepted: 04/28/2008] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Asthma and allergy are complex multifactorial disorders, with both genetic and environmental components determining disease expression. The use of molecular genetics holds great promise for the identification of novel drug targets for the treatment of asthma and allergy. Genome-wide linkage studies have identified a number of potential disease susceptibility loci but replication remains inconsistent. The aim of the current study was to complete a meta-analysis of data from genome-wide linkage studies of asthma and related phenotypes and provide inferences about the consistency of results and to identify novel regions for future gene discovery. METHODS The rank based genome-scan meta-analysis (GSMA) method was used to combine linkage data for asthma and related traits; bronchial hyper-responsiveness (BHR), allergen positive skin prick test (SPT) and total serum Immunoglobulin E (IgE) from nine Caucasian asthma populations. RESULTS Significant evidence for susceptibility loci was identified for quantitative traits including; BHR (989 pedigrees, n = 4,294) 2p12-q22.1, 6p22.3-p21.1 and 11q24.1-qter, allergen SPT (1,093 pedigrees, n = 4,746) 3p22.1-q22.1, 17p12-q24.3 and total IgE (729 pedigrees, n = 3,224) 5q11.2-q14.3 and 6pter-p22.3. Analysis of the asthma phenotype (1,267 pedigrees, n = 5,832) did not identify any region showing genome-wide significance. CONCLUSION This study represents the first linkage meta-analysis to determine the relative contribution of chromosomal regions to the risk of developing asthma and atopy. Several significant results were obtained for quantitative traits but not for asthma confirming the increased phenotype and genetic heterogeneity in asthma. These analyses support the contribution of regions that contain previously identified asthma susceptibility genes and provide the first evidence for susceptibility loci on 5q11.2-q14.3 and 11q24.1-qter.
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Association between C-589T polymorphisms of interleukin-4 gene promoter and asthma: a meta-analysis. Respir Med 2008; 102:984-92. [PMID: 18396027 DOI: 10.1016/j.rmed.2008.02.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2007] [Revised: 02/01/2008] [Accepted: 02/11/2008] [Indexed: 11/20/2022]
Abstract
BACKGROUND A number of studies of genetic epidemiology have assessed the association of C-589T (also referred to as C-590T; rs number, 2243250) polymorphisms in the promoter region of interleukin-4 (IL-4) gene with asthma in different populations. However, the results are inconsistent and inconclusive. OBJECTIVES We performed a meta-analysis of the association between C-589T polymorphisms of IL-4 and asthma with the following objectives: to estimate the magnitude of the gene effect and the possible mode of inheritance. METHODS A genetic model-free approach was used to perform a meta-analysis. Asthma (atopy status nondefined), nonatopic and atopic asthma subgroups were separately analyzed. Heterogeneity and publication bias were also explored. RESULTS Our meta-analysis summarized the evidence regarding the association between C-589T polymorphisms in the promoter region of IL-4 gene and asthma. When all asthma groups were pooled, a significant association of increased asthma risk and T allele was found. In subgroup analysis, our results indicated a significant association and a recessive genetic mode of C-589T polymorphisms of IL-4 with atopic asthma. The CC genotype was about 21 percent less likely to have atopic asthma than the genotype CT and TT. However, C-589T polymorphisms were not significantly associated with nonatopic asthma. CONCLUSIONS This meta-analysis suggests there may be an important effect of single nucleotide polymorphisms (SNPs) in the promoter region of IL-4 gene on the pathogenesis of atopic asthma. This warrants further investigation in larger studies and meta-analysis.
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Choudhry S, Taub M, Mei R, Rodriguez-Santana J, Rodriguez-Cintron W, Shriver MD, Ziv E, Risch NJ, Burchard EG. Genome-wide screen for asthma in Puerto Ricans: evidence for association with 5q23 region. Hum Genet 2008; 123:455-68. [PMID: 18401594 DOI: 10.1007/s00439-008-0495-7] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2008] [Accepted: 03/30/2008] [Indexed: 10/22/2022]
Abstract
While the number of success stories for mapping genes associated with complex diseases using genome-wide association approaches is growing, there is still much work to be done in developing methods for such studies when the samples are collected from a population, which may not be homogeneous. Here we report the first genome-wide association study to identify genes associated with asthma in an admixed population. We genotyped 96 Puerto Rican moderate to severe asthma cases and 88 controls as well as 109 samples representing Puerto Rico's founding populations using the Affymetrix GeneChip Human Mapping 100K array sets. The data from samples representing Puerto Rico's founding populations was used to identify ancestry informative markers for admixture mapping analyses. In addition, a genome-wide association analysis using logistic regression was performed on the data. Although neither admixture mapping nor regression analysis gave any significant association with asthma after correction for multiple testing, an overlap analysis using the top scoring SNPs from different methods suggested chromosomal regions 5q23.3 and 13q13.3 as potential regions harboring genes for asthma in Puerto Ricans. The validation analysis of these two regions in 284 Puerto Rican asthma trios gave significant association for the 5q23.3 region. Our results provide strong evidence that the previously linked 5q23 region is associated with asthma in Puerto Ricans. The detection of causative variants in this region will require fine mapping and functional validation.
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Affiliation(s)
- Shweta Choudhry
- Institute for Human Genetics, University of California, San Francisco, CA, USA.
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Ortega VE, Hawkins GA, Peters SP, Bleecker ER. Pharmacogenetics of the beta 2-adrenergic receptor gene. Immunol Allergy Clin North Am 2008; 27:665-84; vii. [PMID: 17996583 DOI: 10.1016/j.iac.2007.09.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Asthma is a complex genetic disease with multiple genetic and environmental determinants contributing to the observed variability in response to common antiasthma therapies. One focus of asthma pharmacogenetic research has been the beta2-adrenergic receptor gene (ADR beta 2) and its effect on individual responses to beta agonist therapy. Knowledge about the effects of ADR beta 2 variation on therapeutic responses is evolving and should not alter current Asthma Guideline approaches, which consist of the use of short-acting beta agonists (SABAs) for as-needed symptom-based therapy and the use of a regular long-acting beta agonist (LABA) in combination with inhaled corticosteroid therapy for those asthmatics whose symptoms are not controlled by inhaled corticosteroid alone. These approaches are based upon studies showing a consistent pharmacogenetic response to regular use of SABAs and less consistent findings in studies evaluating LABAs. The emerging pharmacogenetic studies are provocative and should lead to functional studies. Meanwhile, the conflicting data concerning LABAs may be caused by such factors as small sample sizes of study populations and differences in experimental design.
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Affiliation(s)
- Victor E Ortega
- Center for Human Genomics, Section of Pulmonary, Critical Care, Allergy, and Immunologic Diseases, Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA
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Hunninghake GM, Lasky-Su J, Soto-Quirós ME, Avila L, Liang C, Lake SL, Hudson TJ, Spesny M, Fournier E, Sylvia JS, Freimer NB, Klanderman BJ, Raby BA, Celedón JC. Sex-stratified linkage analysis identifies a female-specific locus for IgE to cockroach in Costa Ricans. Am J Respir Crit Care Med 2008; 177:830-6. [PMID: 18244952 DOI: 10.1164/rccm.200711-1697oc] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE The basis for gender influences on allergen-specific IgEs is unclear. OBJECTIVES To perform regular and sex-stratified genomewide linkage analyses of IgE to each of three allergens (Ascaris lumbricoides, Blatella germanica [German cockroach]), and Dermatophagoides pteronyssinus [dust mite]) and to conduct an association study of a candidate gene in a linked genomic region. METHODS Genomewide linkage analyses of allergen-specific IgEs were conducted in 653 members of eight large families of Costa Rican children with asthma. An analysis of the association between single-nucleotide polymorphisms in thymic stromal lymphopoietin (TSLP) and IgE measurements was conducted in 417 parent-child trios in Costa Rica. Significant results were replicated in 470 families of white children in the Childhood Asthma Management Program (CAMP). MEASUREMENTS AND MAIN RESULTS Among all subjects, there was suggestive evidence of linkage (LOD >/= 2.72) to IgE to Ascaris (on chromosome 7q) and IgE to dust mite (on chromosomes 7p and 12q). In a sex-stratified analysis, there was significant evidence of linkage to IgE to cockroach on chromosome 5q23 (peak LOD, 4.14 at 127 cM) in female subjects. TSLP is located within the 1.5 LOD-unit support interval for this linkage peak and has female-specific effects on lung disease in mice. In a sex-stratified analysis, the T allele of single-nucleotide polymorphism rs2289276 in TSLP was associated with reductions in IgE to cockroach (in Costa Rican girls) and total IgE (in girls in Costa Rica and in CAMP; P value for sex-by-genotype interaction, <0.01 in both studies). CONCLUSIONS Consistent with findings in murine models, a variant in TSLP may have female-specific effects on allergic phenotypes.
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Zhang J, Paré PD, Sandford AJ. Recent advances in asthma genetics. Respir Res 2008; 9:4. [PMID: 18197984 PMCID: PMC2244620 DOI: 10.1186/1465-9921-9-4] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2007] [Accepted: 01/15/2008] [Indexed: 12/20/2022] Open
Abstract
There are over 100 genes that have been reported to be associated with asthma or related phenotypes. In 2006–2007 alone there were 53 novel candidate gene associations reported in the literature. Replication of genetic associations and demonstration of a functional mechanism for the associated variants are needed to confirm an asthma susceptibility gene. For most of the candidate genes there is little functional information. In a previous review by Hoffjan et al. published in 2003, functional information was reported for 40 polymorphisms and here we list another 22 genes which have such data. Some important genes such as filaggrin, interleukin-13, interleukin-17 and the cysteinyl leukotriene receptor-1 which not only were replicated by independent association studies but also have functional data are reviewed in this article.
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Affiliation(s)
- Jian Zhang
- James Hogg iCAPTURE Center for Cardiovascular and Pulmonary Research, St, Paul's Hospital, Vancouver, B,C,, V6Z 1Y6,
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Scirica CV, Celedón JC. Genetics of asthma: potential implications for reducing asthma disparities. Chest 2008; 132:770S-781S. [PMID: 17998341 DOI: 10.1378/chest.07-1905] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Although genetic factors may partly explain the differences in asthma prevalence, morbidity, and mortality among ethnic groups in the United States, few studies of the genetics of asthma have included members of ethnic minority groups. Only one genome-wide linkage analysis of asthma and/or asthma-related phenotypes (conducted by the Collaborative Study on the Genetics of Asthma) has included any members of ethnic minority populations. The interpretation of the findings of genetic association studies of asthma in ethnic minority groups is complicated by reduced statistical power due to small sample sizes; the failure to correct for multiple comparisons; a lack of homogeneity of the populations studied with regard to area of residence, ancestral background, and/or country of origin; a lack of measurement of relevant environmental exposures; and (for case-control studies of genetic association) a lack of detection and control of potential population stratification. Genetic studies may improve our understanding of asthma and lead to new methods to prevent, diagnose, and treat this disease. Limited study of asthma genetics in ethnic minority populations is unacceptable, as it may prevent these groups from benefiting from future developments in asthma management and thus widen existing disparities in asthma care. Future genetic association studies of asthma among ethnic minorities in the United States should include large samples of populations that have been adequately defined with regard to area of residence, self-designated ancestry, and country of origin. These studies should also include an adequate assessment of potentially relevant environmental exposures and (for case-control association studies) population stratification.
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Osawa H, Troye-Blomberg M, Hirayama K, Kikuchi M, Hombhanje F, Tanihata T, Udomsangpetch R, Björkman A, Kobayakawa T, Kaneko A. CTLA-4 polymorphisms and anti-malarial antibodies in a hyper-endemic population of Papua New Guinea. Trop Med Health 2008. [DOI: 10.2149/tmh.2008-07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Huang FY, Chang TY, Chen MR, Lee HC, Chiu NC, Chi H, Hsu CH, Lin SP, Liu HF, Chen WF, Chu CC, Lin M, Lee YJ. The −590 C/T and 8375 A/G interleukin-4 polymorphisms are not associated with Kawasaki disease in Taiwanese children. Hum Immunol 2008; 69:52-7. [DOI: 10.1016/j.humimm.2007.11.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2007] [Revised: 11/08/2007] [Accepted: 11/13/2007] [Indexed: 10/22/2022]
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Schedel M, Pinto LA, Schaub B, Rosenstiel P, Cherkasov D, Cameron L, Klopp N, Illig T, Vogelberg C, Weiland SK, von Mutius E, Lohoff M, Kabesch M. IRF-1 gene variations influence IgE regulation and atopy. Am J Respir Crit Care Med 2007; 177:613-21. [PMID: 18079498 DOI: 10.1164/rccm.200703-373oc] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
RATIONALE The development of atopic diseases is characterized by skewed immune responses to common allergens. Only recently, interferons have been identified to play a crucial role in these mechanisms. OBJECTIVES Because interferon regulatory factor (IRF)-1 is critical for interferon expression, we tested the hypotheses that genetic changes in this essential transcription factor may have consequences for the development of atopy. METHODS The IRF-1 gene locus was resequenced in 80 human chromosomes. Association and haplotype analyses were performed in a cross-sectional study population of German children from Dresden (n = 1,940), and results were replicated in a second population sample from Munich (n = 1,159), both part of the ISAAC (International Study of Asthma and Allergy in Childhood) phase II. Promoter polymorphism effects were studied using electrophoretic mobility shift assay and colorimetric binding assays. Allele-specific IRF-1 gene expression was studied in vitro using luciferase reporter assays, whereas we assessed ex vivo expression of IRF-1 by real-time polymerase chain reaction and IFN-gamma protein by Luminex technology (Bio-Rad, Hercules, CA). Statistical analyses were performed using SAS/Genetics (SAS 9.1.3; SAS Institute, Cary, NC). MEASUREMENTS AND MAIN RESULTS By resequencing, 49 polymorphisms were identified within the IRF-1 gene. Four blocks containing 11 polymorphisms were significantly associated with atopy, total IgE levels, or specific IgE levels in both populations (P < 0.05). Two polymorphisms changed transcription factor binding of nuclear factor (NF)-kappaB and EGR1 (early growth response 1) to the IRF-1 promoter, altered gene expression in vitro (P = 0.0004), and altered IRF-1 mRNA and IFN-gamma protein expression ex vivo. CONCLUSIONS Our results suggest that functionally relevant IRF-1 polymorphisms influence atopy risk, potentially by altering transcription factor binding, IRF-1 gene expression, and IFN-gamma regulation.
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Affiliation(s)
- Michaela Schedel
- University Children's Hospital, Ludwig Maximilian's University Munich, Lindwurmstrasse 4, D-80337 München, Germany
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Abstract
In asthma, as in many other common multifactorial diseases, the identification of the susceptibility genes has been challenging because consistent results at the genome-wide significance level have been scarce. So far, genome-wide scans have been reported in 17 study populations. By means of genome-wide linkage and hierarchical association analysis, six positional candidate genes (ADAM33, PHF11, DPP10, GPR154, HLA-G, and CYFIP2) for asthma-related traits have been cloned. The interactions of the proteins encoded by these genes and the biological relevance of these signaling pathways in the development of asthma are still poorly understood. Also, the disease mechanisms resulting from the genetic variance in the genes identified remain largely unknown. Although this information is gradually accumulating, we can examine the statistical robustness of each genetic finding in combination with the limited data available on the functional properties of the corresponding proteins to estimate the strengths and weaknesses in the chains of evidence.
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Crestani E, Lohman IC, Guerra S, Wright AL, Halonen M. Association of IL-5 cytokine production and in vivo IgE levels in infants and parents. J Allergy Clin Immunol 2007; 120:820-6. [PMID: 17628648 DOI: 10.1016/j.jaci.2007.05.033] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2006] [Revised: 05/18/2007] [Accepted: 05/22/2007] [Indexed: 10/23/2022]
Abstract
BACKGROUND Total IgE in human subjects tracks strongly from birth onward through unknown mechanisms. Regulation of IgE might occur in relation to adaptive immune cytokine production. In vitro studies have assessed the role of individual cytokines in regulating IgE production in human subjects. OBJECTIVE We sought to investigate the association between IgE levels in vivo and the capacity of the individuals to produce adaptive immune cytokines. METHODS Blood samples from participants in the Tucson Infant Immune Study (children at birth and at 3 and 12 months of age, fathers, and mothers before and after delivery) were assessed for percentage of eosinophils and plasma total IgE levels. IFN-gamma, IL-4, IL-5, IL-13, and IL-10 levels were measured in supernatants of mitogen-stimulated PBMCs and examined cross-sectionally for relation to cytokine production by using simple regression, multiple regression with cytokines only and with other known predictors of IgE levels, and longitudinally by means of random effects modeling. RESULTS After adjusting for eosinophils and other predictors, IL-5 production (but not that of other cytokines) was associated directly with total IgE levels in children at 3 months (P = .009) and 12 months (P = .011) of age but not at birth. The IL-5/IgE association was present also in fathers (P = .040) and in mothers, both during pregnancy (P < .001) and after delivery (P = .030). CONCLUSIONS This study indicates that mitogen-stimulated IL-5 production is associated with in vivo total IgE levels, independent of the production of other cytokines and circulating eosinophils. CLINICAL IMPLICATIONS Understanding the regulation of IgE in vivo might help elucidate the development of allergic responses in individuals.
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Affiliation(s)
- Elena Crestani
- Arizona Respiratory Center, University of Arizona Health Sciences Center, University of Arizona, Tucson, AZ 85724-5030, USA
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Li Y, Wu B, Xiong H, Zhu C, Zhang L. Polymorphisms of STAT-6, STAT-4 and IFN-gamma genes and the risk of asthma in Chinese population. Respir Med 2007; 101:1977-81. [PMID: 17532201 DOI: 10.1016/j.rmed.2007.04.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2006] [Revised: 03/29/2007] [Accepted: 04/05/2007] [Indexed: 11/19/2022]
Abstract
BACKGROUND Asthma is a complex disease resulting from multiple gene-gene and gene-environment interactions. Study on gene-gene interactions could provide insight into the pathophysiologic mechanisms of the disease. OBJECTIVES We investigated the single nucleotide polymorphisms and interactions among three different loci in three candidate genes (STAT-6 G2964A, STAT-4 T90089C and IFN-gamma T874A) in 95 Chinese asthmatic subjects and 95 matched controls to determine the possible associations with asthma. METHODS Genotyping of the gene polymorphisms was performed by means of PCR-SSCP analysis. Genotype-phenotype associations were examined in dominant and recessive genetic models using logistic regression. The method of multifactor dimensionality reduction was used to analyze gene-gene interactions. RESULTS No statistically significant difference was found in the distribution of the STAT-6 G2964A polymorphisms between asthmatic patients and controls in this case-control study. The STAT-4 T90089C polymorphisms were significantly associated with asthma in the dominant model (p=0.007). As for the IFN-gamma T874A, the significant associations were found in both dominant model (p=0.004) and recessive model (p=0.006). A significant gene-gene interaction was found among STAT-6, STAT-4 and IFN-gamma on the risk of asthma. In the best 3-locus model, the odds ratio for the high-risk to the low-risk group was 6.9 (95% CI, 3.5-13.7; p<0.0001). CONCLUSIONS Our findings suggest that STAT-4 T90089C and IFN-gamma T874A polymorphisms might be the genetic factors for the risk of asthma in the Chinese population. In addition, the significant interactions among STAT-6 G2964A, STAT-4 T90089C and IFN-gamma T874A may increase an individual's susceptibility and contribute to the pathogenesis of asthma.
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Affiliation(s)
- Yafei Li
- Department of Epidemiology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, PR China.
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Lee KM, Shen M, Chapman RS, Yeager M, Welch R, He X, Zheng T, Hosgood HD, Yang D, Berndt SI, Chanock S, Lan Q. Polymorphisms in immunoregulatory genes, smoky coal exposure and lung cancer risk in Xuan Wei, China. Carcinogenesis 2007; 28:1437-41. [PMID: 17361014 DOI: 10.1093/carcin/bgm030] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We conducted a population-based case-control study in Xuan Wei, China, where lung cancer rates are among the highest in China due to exposure to indoor coal combustion products, to evaluate the association between polymorphisms in immunoregulatory genes and lung cancer risk. A total of 122 incident primary lung cancer cases and 122 individually matched controls were enrolled in Xuan Wei, China. Fifty single-nucleotide polymorphisms (SNPs) in 23 immunoregulatory genes involved in inflammation were genotyped and analyzed by logistic regression to assess the risk of lung cancer. A global test of association for 42 SNPs, which excluded eight SNPs that were in very tight linkage disequilibrium with other SNPs, was statistically significant (P = 0.01), suggesting that overall genetic variation in this pathway contributes to lung cancer risk. In addition, the IL1B -1060TT (i.e. -511TT) genotype was associated with increased lung cancer risk compared with the CC genotype [odds ratio (OR) = 2.27, 95% confidence interval (CI) = 1.05-4.91]. The IL8RA Ex2+860 GC or CC (OR = 0.27, 95% CI = 0.11-0.67), ICAM1 Ex2+100 AT or TT (OR = 0.39, 95% CI = 0.18-0.88) and IL12A Ex7+277 GA or AA (OR = 0.43, 95% CI = 0.22-0.84) genotypes were associated with decreased lung cancer risk. The protective effect of the IL8RA variant was stronger among subjects with high cumulative smoky coal use (> or = 130 tons) (OR = 0.11, 95% CI = 0.03-0.44; P(interaction) = 0.03). In conclusion, genetic variation in immunoregulatory genes may play an important role in the development of lung cancer in this population.
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Affiliation(s)
- Kyoung-Mu Lee
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD 20892-7240, USA.
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Bierbaum S, Heinzmann A. The genetics of bronchial asthma in children. Respir Med 2007; 101:1369-75. [PMID: 17353123 DOI: 10.1016/j.rmed.2007.01.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2006] [Accepted: 01/28/2007] [Indexed: 10/23/2022]
Abstract
Bronchial asthma is a chronic inflammatory disease based on an inappropriate stimulation of the immune system, for instance by environmental aeroallergens. It is characterised by bronchial hyperreactivity, reversible airway obstruction and mucus overproduction. During the last decades bronchial asthma has become the most common disease of childhood. Accordingly, many epidemiological and genetic studies have dealt with its origin. In fact, hundreds of genome-wide linkage analyses and association studies have identified several chromosomal regions harbouring asthma susceptibility genes like chromosome 2q, 5q, 6q, 11q, 12q and 13q. Also about 100 candidate genes for asthma have been described. However, not all of them have been confirmed in independent studies. Besides the genetic predisposition environmental factors play an important role in the development of allergic diseases. Studies predominantly performed in farmer children have shown that exposure to bacterial endotoxin early in life reduces the risk to develop asthma or atopy later on. Thus, recent studies focussed also on the interaction of genes variants with environmental factors which is summarised under the term genetic epidemiology. Further dissection of asthma genetics and its complex interaction with surrounding factors will hopefully help us in the development of new very specific drugs. In addition, the generation of a genetic risk profile for bronchial asthma should enable us for the first time to take well-directed preventive measurements early in live.
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Affiliation(s)
- Sibylle Bierbaum
- Centre for Pediatrics and Adolescent Medicine, University of Freiburg, Mathildenstrasse 1, D 79106 Freiburg, Germany
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Haselkorn T, Borish L, Miller DP, Weiss ST, Wong DA. High prevalence of skin test positivity in severe or difficult-to-treat asthma. J Asthma 2007; 43:745-52. [PMID: 17169826 DOI: 10.1080/02770900601031540] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
BACKGROUND Skin tests are considered the gold standard for detecting allergen-specific immunoglobulin E (IgE) in the clinical setting and are an important tool for diagnosing and managing allergic asthma. OBJECTIVE To assess the prevalence of skin testing in patients > or = 12 years enrolled in The Epidemiology and Natural History of Asthma: Outcomes and Treatment Regimens (TENOR) study. METHODS Patients were asked whether they had ever been skin tested and, if so, they were asked to provide the test results. Clinical characteristics were used to compare positive (ST+), negative (ST-), and skin test not done (STND) patients. RESULTS Of 2,985 patients eligible, 85.8% recalled being skin tested. Of those tested, 93.5% were positive (allergist 95.7%, pulmonologist 87.3%). A high proportion of Whites (93.5%) and non-Whites (94.0%) were ST+; however, more non-Whites had never been skin tested (21.7% vs. 12.3%, respectively; p < 0.0001). Total serum IgE was 104.6 IU/mL for ST+ patients, 87.1 IU/mL for STND patients, and 32.4 IU/mL for ST- patients. Age at asthma onset, duration of asthma, and the prevalence of atopic disorders and asthma triggers differentiated the ST+ from the ST- group. Disease severity appeared similar between the two groups. In general, values for STND patients were closer to the ST+ group, suggesting that those not tested would have been ST+ if administered a test. CONCLUSIONS The prevalence of ST+ patients was high in allergy and pulmonology practices, and in White and non-White patients. These data support the utility of a more complete allergic evaluation in severe asthmatics. Skin testing appears associated with disease pathophysiologies in asthma.
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Abbott W, Gane E, Winship I, Munn S, Tukuitonga C. Polymorphism in intron 1 of the interferon-gamma gene influences both serum immunoglobulin E levels and the risk for chronic hepatitis B virus infection in Polynesians. Immunogenetics 2007; 59:187-95. [PMID: 17211638 DOI: 10.1007/s00251-006-0184-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2006] [Accepted: 11/21/2006] [Indexed: 01/12/2023]
Abstract
Intron 1 of the interferon-gamma (IFNG) gene contains two polymorphisms. The 12 CA-repeat allele of the +875 IFNGCA microsatellite and the T allele of the +A874T single nucleotide polymorphism (SNP) have been associated with increased in vitro IFNG production and a variety of clinical phenotypes. The purpose of this study was to determine whether these polymorphisms influence total serum IgE levels [tsIgE] and the outcome of a hepatitis B virus (HBV) infection. IFNGCA and +A874T were typed in 186 asthmatics of Niuean ancestry and in Polynesian women with a chronic HBV infection (n = 60) and with natural immunity to the HBV (n = 66). The IFNGCA genotype was associated with [tsIgE] in asthmatic children (n = 51, p = 0.004) but not adults (n = 135, p = 0.87). The data were consistent with a co-dominant influence of the 12 CA-repeat allele on high [tsIgE]. The IFNGCA genotype was also associated with the risk for chronic HBV infection (chi (2) = 11.6, p = 0.003) because of a dominant effect of the 12 CA-repeat allele on developing natural immunity in homozygotes (OR = 5.8, p = 0.003) and heterozygotes (OR = 2.7, p = 0.01). Similar associations were found for the T allele of the +A874T SNP. The possibility that these associations were due to linked alleles in the adjacent 783 bp of the promoter and 3'-untranslated region of the IFNG gene was excluded by direct sequencing. In summary, high-IFNG-producing alleles in intron 1 of the IFNG locus are associated with high [tsIgE] in asthmatic children from Niue and with natural immunity to the HBV in Polynesian women. These findings are consistent with a previous report of an association between +875 IFNGCA and [tsIgE] and provide preliminary evidence of a new association with the outcome of an HBV infection.
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Affiliation(s)
- William Abbott
- New Zealand Liver Transplant Unit, Auckland City Hospital, Private Bag 92-024, Auckland, New Zealand.
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Liebeler CL, Basu S, Jackola DR. Allergen-specific IgG1 provides parsimonious heritability estimates for atopy-associated immune responses to allergens. Hum Immunol 2006; 68:113-21. [PMID: 17321901 PMCID: PMC1868472 DOI: 10.1016/j.humimm.2006.12.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2006] [Revised: 11/27/2006] [Accepted: 12/01/2006] [Indexed: 10/01/2022]
Abstract
Although serum total immunoglobulin E (IgE) is generally elevated in atopic conditions, it is an unreliable trait for dissecting the genetic and environmental components contributing to atopic immune responses, because it can be significantly confounded by demographic factors (age, gender, and race) and clinical status (atopic vs nonatopic). Allergen-specific IgE is a discontinuous trait present only in those with sensitivity to allergens. However, all people will produce allergen-specific immunoglobulin G1 (IgG1), which is elevated among those atopically sensitized to specific allergens. We screened 91 Caucasian nuclear families (N = 367) with medical histories of atopic diseases and used variance components analysis to compare heritability estimates for total IgE and IgG1 produced against the common major allergen from house dust mite Dermatophagoides pteronyssinus (Der p 1). An estimate of total IgE heritability was about 48%, although this was significantly confounded by age, gender, and clinical atopic status. In contrast, Der p 1-IgG1 demonstrated a significant inherited component of about 62% that was not influenced by age, gender, or clinical status. For genetic studies of atopic humoral responses, allergen-specific IgG1 may be a more reliable quantitative trait than serum IgE. Moreover, atopy is an inherited deregulation of immune responses to noninfectious antigens, involving antibody isotypes other than IgE.
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Affiliation(s)
| | - Saonli Basu
- Division of Biostatistics, School of Public Health, University of Minnesota Medical School, Minneapolis, MN
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