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Žak R, Navasardyan L, Hunák J, Martinů J, Heneberg P. PTPN22 intron polymorphism rs1310182 (c.2054-852T>C) is associated with type 1 diabetes mellitus in patients of Armenian descent. PLoS One 2023; 18:e0286743. [PMID: 37315092 DOI: 10.1371/journal.pone.0286743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 05/23/2023] [Indexed: 06/16/2023] Open
Abstract
Protein tyrosine phosphatase, nonreceptor type 22 (PTPN22), is an archetypal non-HLA autoimmunity gene. It is one of the most prominent genetic contributors to type 1 diabetes mellitus outside the HLA region, and prevalence of its risk variants is subject to enormous geographic variability. Here, we address the genetic background of patients with type 1 diabetes mellitus of Armenian descent. Armenia has a population that has been genetically isolated for 3000 years. We hypothesized that two PTPN22 polymorphisms, rs2476601 and rs1310182, are associated with type 1 diabetes mellitus in persons of Armenian descent. In this association study, we genotyped the allelic frequencies of two risk-associated PTPN22 variants in 96 patients with type 1 diabetes mellitus and 100 controls of Armenian descent. We subsequently examined the associations of PTPN22 variants with the manifestation of type 1 diabetes mellitus and its clinical characteristics. We found that the rs2476601 minor allele (c.1858T) frequency in the control population was very low (q = 0.015), and the trend toward increased frequency of c.1858CT heterozygotes among patients with type 1 diabetes mellitus was not significant (OR 3.34, 95% CI 0.88-12.75; χ2 test p > 0.05). The control population had a high frequency of the minor allele of rs1310182 (q = 0.375). The frequency of c.2054-852TC heterozygotes was significantly higher among the patients with type 1 diabetes mellitus (OR 2.39, 95% CI 1.35-4.24; χ2 test p < 0.001), as was the frequency of the T allele (OR 4.82, 95% CI 2.38-9.76; χ2 test p < 0.001). The rs2476601 c.1858CT genotype and the T allele correlated negatively with the insulin dose needed three to six months after diagnosis. The rs1310182 c.2054-852CC genotype was positively associated with higher HbA1c at diagnosis and 12 months after diagnosis. We have provided the first information on diabetes-associated polymorphisms in PTPN22 in a genetically isolated Armenian population. We found only a limited contribution of the prototypic gain-of-function PTPN22 polymorphism rs2476601. In contrast, we found an unexpectedly close association of type 1 diabetes mellitus with rs1310182.
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Affiliation(s)
- Robert Žak
- Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Lusine Navasardyan
- Department of Endocrinology, Yerevan State Medical University after Mkhitar Heratsi, Yerevan, Armenia
| | - Ján Hunák
- Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Jiřina Martinů
- Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Petr Heneberg
- Third Faculty of Medicine, Charles University, Prague, Czech Republic
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Smith R, Moots RJ, Murad M, Wallace GR. A Darwinian View of Behçet's Disease. RHEUMATOLOGY AND IMMUNOLOGY RESEARCH 2021; 2:91-99. [PMID: 36465976 PMCID: PMC9524781 DOI: 10.2478/rir-2021-0013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Accepted: 06/30/2021] [Indexed: 04/25/2023]
Abstract
Behçet's disease (BD) is a multisystem inflammatory disorder of unknown etiology, characterized by oral and genital ulceration, with other complications including eye, skin, joint, and central nervous system (CNS) lesions. Diagnosis is based on clinical findings, which may differ between patients. There is a strong genetic basis for BD; however, only a few genes have been associated with the disease across the geographical spread of BD. In this article, we discuss the history and combination of genes involved in this complex disease in relation to the geographical range and present our view that the disease has developed from a Darwinian perspective, with different gene polymorphisms that affect the same biological pathway. Moreover, these mutations individually are protective mechanisms against the disease relevant to each region, which affected both archaic and modern humans.
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Affiliation(s)
- Rhodri Smith
- Department of Rheumatology, Aintree Hospital, Liverpool, UK
| | | | - Mariam Murad
- Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Graham R. Wallace
- Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
- E-mail:
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Zhang Q, Li H, Hou S, Yu H, Su G, Deng B, Qi J, Zhou C, Kijlstra A, Yang P. Association of genetic variations in PTPN2 and CD122 with ocular Behcet's disease. Br J Ophthalmol 2018; 102:996-1002. [PMID: 29502070 DOI: 10.1136/bjophthalmol-2017-310820] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 12/29/2017] [Accepted: 02/15/2018] [Indexed: 11/04/2022]
Abstract
BACKGROUND Protein tyrosine phosphatases (PTPs) play critical roles in human autoimmunity. Previous studies found that PTPN2 may be the key regulatory factor in the T-cell-mediated immune response. PTPN2 regulates the Janus kinase/signal transducers and activators of transcription pathway by inhibiting signalling via the interleukin (IL)-2 receptor (CD122). An association between genetic variations in PTPN2 and CD122 with ocular Behcet's disease (BD) has not yet been addressed and was therefore the purpose of this study. METHODS A two-stage case-control study was performed in 906 patients with ocular BD and 2178 healthy controls. Genotyping analysis of 11 single nucleotide polymorphisms was carried out. The expression of PTPN2 in peripheral blood mononuclear cells (PBMCs) was quantified by real-time PCR and cytokine production was measured by ELISA. RESULTS The frequency of the GG genotype of PTPN2-rs7234029 was significantly lower in patients with ocular BD (p=1.94×10-5, pc=8.34×10-4, OR=0.466). Stratification according to gender showed that rs7234029 was significantly associated with BD in men. A stratified analysis according to the main clinical features showed that rs7234029 was significantly associated with genital ulcers, skin lesions and a positive pathergy test. No association could be detected between BD and CD122 gene polymorphisms. Functional studies showed that rs7234029 GG genotype carriers had a higher PNPT2 mRNA expression level than those which carrying the AA or AG genotype, and a decreased secretion of IL-17 and tumour necrosis factor-alpha was seen by PBMCs from GG carriers. No significant difference could be detected concerning IL-1β or IL-6 production by stimulated PBMCs between the different genotype groups. CONCLUSIONS This study shows that a PTPN2-rs7234029 polymorphism is associated with ocular BD and is strongly influenced by gender. In addition, our results suggest that the genetic association with PTPN2 may involve the regulation of PTPN2 mRNA expression and cytokine secretion.
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Affiliation(s)
- Qi Zhang
- Ophthalmology Department, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, People's Republic of China
| | - Hua Li
- Ophthalmology Department, Yongchuan Hospital, Chongqing Medical University, Chongqing, People's Republic of China
| | - Shengping Hou
- Ophthalmology Department, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, People's Republic of China
| | - Hongsong Yu
- Ophthalmology Department, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, People's Republic of China
| | - Guannan Su
- Ophthalmology Department, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, People's Republic of China
| | - Bolin Deng
- Ophthalmology Department, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, People's Republic of China
| | - Jian Qi
- Ophthalmology Department, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, People's Republic of China
| | - Chunjiang Zhou
- Ophthalmology Department, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, People's Republic of China
| | - Aize Kijlstra
- University Eye Clinic Maastricht, Maastricht, The Netherlands
| | - Peizeng Yang
- Ophthalmology Department, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, People's Republic of China
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Aflatounian M, Rezaei A, Sadr M, Saghazadeh A, Elhamian N, Sadeghi H, Motevasselian F, Farahmand F, Fallahi G, Motamed F, Najafi M, Rezaei N. Association of PTPN22 Single Nucleotide Polymorphisms with Celiac Disease. Fetal Pediatr Pathol 2017; 36:195-202. [PMID: 28481156 DOI: 10.1080/15513815.2017.1290725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
OBJECTIVES Celiac disease is a chronic autoimmune disease in which gene-environment interactions cause the immune system to unfavorably react to naturally gluten-containing foods. PTPN22 plays a crucial role in regulating the function of various cells of the immune system, particularly T cells. Polymorphisms of the PTPN22 gene have been associated with many autoimmune diseases. The present genetic association study was conducted to investigate the possible associations between PTPNTT single nucleotide polymorphisms (SNPs) and celiac disease in an Iranian population. MATERIALS AND METHODS The study population consisted of 45 patients with celiac disease and 93 healthy controls. The study genotyped five SNPs of the PTPN22 gene: rs12760457, rs1310182, rs1217414, rs33996649, and rs2476601. RESULTS AND CONCLUSIONS Control and patient groups did not differ on the genotype distribution of four of five investigated SNPs in the PTPN22 gene, for example, rs12760457, rs2476601, rs1217414, and rs33996649. The only investigated PTPN22 variant, which could be associated with CD, was rs1310182. A significant increase in the carriage of the T allele of rs1310182 in CD patients was observed (OR (95% CI) = 11.42 (5.41, 24.1), p value < 0.0001). The TT genotype of this SNP was significantly associated with celiac disease. Our study suggests that the rs1310182 SNP of PTPN22 gene may be a predisposing factor of celiac disease in the Iranian population. Further studies are required to investigate the issue in other racial and ethnic subgroups.
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Affiliation(s)
- Majid Aflatounian
- a Children's Medical Center, Tehran University of Medical Sciences , Tehran , Iran
| | - Arezou Rezaei
- b Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences , Tehran , Iran
| | - Maryam Sadr
- c Molecular Immunology Research Center, Children's Medical Center, Tehran University of Medical Sciences , Tehran , Iran
| | - Amene Saghazadeh
- a Children's Medical Center, Tehran University of Medical Sciences , Tehran , Iran
| | - Nazanin Elhamian
- b Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences , Tehran , Iran
| | - Hengameh Sadeghi
- c Molecular Immunology Research Center, Children's Medical Center, Tehran University of Medical Sciences , Tehran , Iran
| | | | - Fatemeh Farahmand
- a Children's Medical Center, Tehran University of Medical Sciences , Tehran , Iran
| | | | - Farzaneh Motamed
- a Children's Medical Center, Tehran University of Medical Sciences , Tehran , Iran
| | - Mehri Najafi
- a Children's Medical Center, Tehran University of Medical Sciences , Tehran , Iran
| | - Nima Rezaei
- a Children's Medical Center, Tehran University of Medical Sciences , Tehran , Iran.,d Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN) , Tehran , Iran
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Ke X, Song S, Wang X, Shen Y, Kang H, Hong S. Associations of single nucleotide polymorphisms of PTPN22 and Ctla4 genes with the risk of allergic rhinitis in a Chinese Han population. Hum Immunol 2016; 78:227-231. [PMID: 27888068 DOI: 10.1016/j.humimm.2016.11.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Revised: 11/02/2016] [Accepted: 11/22/2016] [Indexed: 11/26/2022]
Abstract
BACKGROUND Allergic rhinitis (AR) is an inflammatory disorder of the upper airway. Protein tyrosine phosphatase non-receptor 22 encoded by PTPN22 gene and cytotoxic T-lymphocyte associated 4 encoded by Ctla4 gene are associated with autoimmune diseases. PURPOSE This study was performed to evaluate the potential association of PTPN22 and Ctla4 single nucleotide polymorphisms (SNPs) with AR in a Chinese Han population. METHODS A case-control study was performed in 783 Chinese AR patients and 811 healthy controls. Three SNPs in PTPN22 gene (rs2488457, rs1310182, and rs3789604) and 6 SNPs in Ctla4 gene (rs3087243, rs231779, rs11571302, rs11571315, rs231725, and rs35219727) were detected using a polymerase chain reaction-restriction fragment length polymorphism assay (PCR-RFLP). RESULTS For PTPN22 gene, a significantly decreased prevalence of the rs2488457 CC genotype and C allele was found in AR patients. The frequencies of the rs1310182 CC genotype, CT genotype, and C allele were significantly associated with the risk of AR. For Ctla4 gene, a significantly increased prevalence of the rs11571302 AA genotype, CA genotype and A allele was noted in AR patients. CONCLUSION SNPs of PTPN22 and Ctla4 genes are significantly associated with the risk of AR in the Chinese Han population.
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Affiliation(s)
- Xia Ke
- Department of Otorhinolaryngology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Shanghua Song
- Department of Otorhinolaryngology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xiaoqiang Wang
- Department of Otorhinolaryngology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yang Shen
- Department of Otorhinolaryngology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Houyong Kang
- Department of Otorhinolaryngology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Suling Hong
- Department of Otorhinolaryngology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
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Li F, Li N, Zhu Q, Zhou Z, Zhang P, Yang C, Han Q, Lv Y, Wei P, Liu Z. Association of PTPN22 gene polymorphisms with chronic hepatitis B virus infection in Chinese Han population. Hum Immunol 2015; 76:736-41. [PMID: 26429315 DOI: 10.1016/j.humimm.2015.09.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 06/23/2015] [Accepted: 09/27/2015] [Indexed: 01/12/2023]
Abstract
Lymphoid protein tyrosine phosphatase encoded by protein tyrosine phosphatase non-receptor 22 (PTPN22) gene plays an important regulatory role in T- and B-cell activation. This study investigated PTPN22 -1123G/C and intron 16 T/C polymorphisms in 372 patients with chronic hepatitis B virus (HBV) infection, 72 HBV infection resolvers and 273 healthy controls. Genotypic association tests between groups assuming codominant, dominant or log-additive genetic models were performed. In recessive model, PTPN22 -1123G/C genotype GG in healthy controls was more frequent than infection resolvers (P=0.037, OR=3.606, 95%CI=1.079-12.053) and this genotype in HBV patients was more frequent than resolvers although the difference was not significant (P=0.059). The PTPN22 intron 16 T/C genotype TC in cirrhosis patients was significantly higher than asymptomatic carriers (ASC) in codominant (P=0.028, OR=9.792, 95%CI=1.281-74.832) and overdominant (P=0.025, OR=10.142, 95%CI=1.332-77.214) models. This genotype in hepatocellular carcinoma (HCC) patients was significantly higher than ASC in codominant (P=0.034, OR=9.200, 95%CI=1.176-71.990) and overdominant (P=0.030, OR=9.677, 95%CI=1.241-75.442) models. These findings suggest that PTPN22 polymorphisms may predispose the chronicity or the development of cirrhosis and HCC in HBV infection.
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Affiliation(s)
- Fang Li
- Department of Infectious Diseases, First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China
| | - Na Li
- Department of Infectious Diseases, First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China
| | - Qianqian Zhu
- Department of Infectious Diseases, First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China
| | - Zhihua Zhou
- Department of Infectious Diseases, First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China
| | - Pingping Zhang
- Department of Infectious Diseases, First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China
| | - Cuiling Yang
- Department of Infectious Diseases, First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China
| | - Qunying Han
- Department of Infectious Diseases, First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China
| | - Yi Lv
- Department of Hepatobiliary Surgery, First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China; Institute of Advanced Surgical Technology and Engineering, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China
| | - Ping Wei
- Department of Infectious Diseases, First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China
| | - Zhengwen Liu
- Department of Infectious Diseases, First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China; Institute of Advanced Surgical Technology and Engineering, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, China.
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Barry RJ, Alsalem JA, Faassen J, Murray PI, Curnow SJ, Wallace GR. Association analysis of TGFBR3 gene with Behçet's disease and idiopathic intermediate uveitis in a Caucasian population. Br J Ophthalmol 2015; 99:696-9. [PMID: 25677673 DOI: 10.1136/bjophthalmol-2014-306198] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 01/25/2015] [Indexed: 12/14/2022]
Abstract
BACKGROUND Transforming growth factor β (TGFβ) is an important immunoregulatory cytokine in regulatory T cell (Treg) and Th17-mediated pathology, including uveitis due to Behçet's disease (BD). Of the three isoforms, TGFβ2 is found at highest levels in the aqueous humour of uninflamed eyes. TGFβ signals through a cell-surface receptor comprising three subunits (TGFBR1, 2 and 3). TGFBR3 is considered necessary for TGFβ2 signal transduction, but not for other isoforms. A polymorphism in TGFBR3 (rs1805110) has previously been identified in Han Chinese patients with BD. We investigated the frequency of this polymorphism in a Caucasian population with BD and idiopathic intermediate uveitis (IIU). METHODS The single-nucleotide polymorphism (SNP) rs1805110 in TGFBR3 was genotyped in 75 BD patients, 92 IIU disease controls and 85 disease-free controls. The association with both diseases was analysed using Fisher's exact test. RESULTS No significant difference in rs1805110 allele or genotype frequency was observed. A low frequency of the T allele was observed (5.88% control, 9.33% BD, 10.33% IIU) with the TT genotype absent in patients with BD and IIU (1.18% control, 0% BD and 0% IIU). Stratification analysis according to clinical features of BD did not associate with the tested SNP. CONCLUSIONS RS1805110 is not associated with BD or IIU in Caucasian patients. The T allele frequency is consistent with that presented for Caucasian populations in the HapMap database (p>0.05). Our results differ from the previous analysis in Han Chinese patients (p<0.0001), however, the possibility of having a much smaller effect due to the low minority frequency cannot be excluded.
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Affiliation(s)
- Robert J Barry
- Centre for Translational Inflammation Research, College of Medical and Dental Sciences, University of Birmingham, Queen Elizabeth Hospital, Birmingham, UK Academic Unit of Ophthalmology, University of Birmingham, Birmingham and Midland Eye Centre, City Hospital, Birmingham, UK
| | - Jawaher A Alsalem
- Centre for Translational Inflammation Research, College of Medical and Dental Sciences, University of Birmingham, Queen Elizabeth Hospital, Birmingham, UK Academic Unit of Ophthalmology, University of Birmingham, Birmingham and Midland Eye Centre, City Hospital, Birmingham, UK
| | - Juliet Faassen
- Centre for Translational Inflammation Research, College of Medical and Dental Sciences, University of Birmingham, Queen Elizabeth Hospital, Birmingham, UK
| | - Philip I Murray
- Centre for Translational Inflammation Research, College of Medical and Dental Sciences, University of Birmingham, Queen Elizabeth Hospital, Birmingham, UK Academic Unit of Ophthalmology, University of Birmingham, Birmingham and Midland Eye Centre, City Hospital, Birmingham, UK Behçet's Centre of Excellence, City Hospital, Sandwell & West Birmingham Hospitals NHS Trust, Birmingham, UK
| | - S John Curnow
- Centre for Translational Inflammation Research, College of Medical and Dental Sciences, University of Birmingham, Queen Elizabeth Hospital, Birmingham, UK Academic Unit of Ophthalmology, University of Birmingham, Birmingham and Midland Eye Centre, City Hospital, Birmingham, UK
| | - Graham R Wallace
- Centre for Translational Inflammation Research, College of Medical and Dental Sciences, University of Birmingham, Queen Elizabeth Hospital, Birmingham, UK Academic Unit of Ophthalmology, University of Birmingham, Birmingham and Midland Eye Centre, City Hospital, Birmingham, UK
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Current aspects of vitiligo genetics. Postepy Dermatol Alergol 2014; 31:247-55. [PMID: 25254010 PMCID: PMC4171675 DOI: 10.5114/pdia.2014.43497] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 05/17/2014] [Accepted: 05/27/2014] [Indexed: 12/24/2022] Open
Abstract
Vitiligo is a common acquired depigmentation disorder of the skin manifested by the presence of white macules. The disease occurs at a frequency of approximately 1–4% of the world population. Currently, the most popular theory of vitiligo development is a multifactorial hypothesis according to which genetic conditions predispose vitiligo macules to occur as a result of specific environmental factors. According to the genetic hypothesis, vitiligo inheritance is multigenic. Genetic studies conducted so far concern patients with non-segmental vitiligo. There are three basic techniques of genetic studies: candidate gene association studies, genomewide linkage studies and genome-wide association studies (GWAS). The GWAS are the “gold standard” for detecting susceptibility genes. Up to now, approximately 36 convincing non-segmental vitiligo susceptibility loci have been identified. Approximately 90% of them encode immunoregulatory proteins, while approximately 10% encode melanocyte proteins. The existence of various associations between vitiligo and other autoimmune diseases may provide new knowledge on the causes of many disorders. Examples include the inverse relationship between vitiligo and melanoma and association of vitiligo with other autoimmune diseases. The main goal of all researches is to find new, optimal therapeutic strategies for vitiligo and other autoimmune diseases.
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Kumar N, Kaur G, Kanga U, Tandon N, Caillat-Zucman S, Mehra NK. Association of PTPN22+1858C/T polymorphism with Type 1 diabetes in the North Indian population. Int J Immunogenet 2014; 41:318-23. [DOI: 10.1111/iji.12129] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 04/07/2014] [Accepted: 04/27/2014] [Indexed: 12/17/2022]
Affiliation(s)
- N. Kumar
- Department of Transplant Immunology and Immunogenetics; All India Institute of Medical Sciences; New Delhi India
| | - G. Kaur
- Department of Transplant Immunology and Immunogenetics; All India Institute of Medical Sciences; New Delhi India
| | - U. Kanga
- Department of Transplant Immunology and Immunogenetics; All India Institute of Medical Sciences; New Delhi India
| | - N. Tandon
- Department of Endocrinology and Metabolism; All India Institute of Medical Sciences; New Delhi India
| | - S. Caillat-Zucman
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR 1149; Hôpital Robert Debre; Université Paris Diderot; Paris France
| | - N. K. Mehra
- Department of Transplant Immunology and Immunogenetics; All India Institute of Medical Sciences; New Delhi India
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A functional variant of PTPN22 confers risk for Vogt-Koyanagi-Harada syndrome but not for ankylosing spondylitis. PLoS One 2014; 9:e96943. [PMID: 24816862 PMCID: PMC4016172 DOI: 10.1371/journal.pone.0096943] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 04/13/2014] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Protein tyrosine phosphatase non-receptor 22 (PTPN22) is a key negative regulator of T lymphocytes and has emerged as an important candidate susceptibility factor for a number of immune-related diseases. This study aimed to examine the predisposition of PTPN22 SNPs to Vogt-Koyanagi-Harada (VKH) syndrome and acute anterior uveitis (AAU) associated with ankylosing spondylitis (AS). METHODS A total of 1005 VKH syndrome, 302 AAU+AS+ patients and 2010 normal controls among the Chinese Han population were enrolled in the study. Genotyping, PTPN22 expression, cell proliferation, cytokine production and cell activation were examined by PCR-RFLP, Real-time PCR, CCK8, ELISA and Flow cytometry. RESULTS The results showed significantly increased frequencies of the rs2488457 CC genotype and C allele but a decreased frequency of the GG genotype in VKH syndrome patients (PBonferroni correction (Pc) = 3.47×10(-7), OR = 1.54; Pc = 3.83×10(-8), OR = 1.40; Pc = 6.35×10(-4), OR = 0.62; respectively). No significant association of the tested SNPs with AAU+AS+ patients was observed. Functional studies showed a decreased PTPN22 expression, impaired cell proliferation and lower production of IL-10 in rs2488457 CC cases compared to GG cases (Pc = 0.009, Pc = 0.015 and Pc = 0.048 respectively). No significant association was observed concerning T cell activation and rs2488457 genotype. CONCLUSIONS The study showed that a functional variant of PTPN22 confers risk for VKH syndrome but not for AAU+AS+ in a Chinese Han population, which may be due to a modulation of the PTPN22 expression, PBMC proliferation and IL-10 production.
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Cénit MC, Márquez A, Cordero-Coma M, Fonollosa A, Llorenç V, Artaraz J, Valle DD, Blanco R, Cañal J, Salom D, Serrano JLG, de Ramón E, José del Rio M, Gorroño-Echebarría MB, Martín-Villa JM, Molins B, Ortego-Centeno N, Martín J. Lack of association between the protein tyrosine phosphatase non-receptor type 22 R263Q and R620W functional genetic variants and endogenous non-anterior uveitis. Mol Vis 2013; 19:638-43. [PMID: 23559857 PMCID: PMC3611931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Accepted: 03/18/2013] [Indexed: 10/31/2022] Open
Abstract
OBJECTIVE Endogenous uveitis is a major cause of visual loss mediated by the immune system. The protein tyrosine phosphatase non-receptor type 22 (PTPN22) gene encodes a lymphoid-specific phosphatase that plays a key role in T-cell receptor (TCR) signaling. Two independent functional missense single nucleotide polymorphisms (SNPs) located within the PTPN22 gene (R263Q and R620W) have been associated with different autoimmune disorders. We aimed to analyze for the first time the influence of these PTPN22 genetic variants on endogenous non-anterior uveitis susceptibility. METHODS We performed a case-control study of 217 patients with endogenous non-anterior uveitis and 718 healthy controls from a Spanish population. The PTPN22 polymorphisms (rs33996649 and rs2476601) were genotyped using TaqMan allelic discrimination assays. The allele, genotype, carriers, and allelic combination frequencies were compared between cases and controls with χ(2) analysis or Fisher's exact test. RESULTS Our results showed no influence of the studied SNPs in the global susceptibility analysis (rs33996649: allelic P- value=0.92, odds ratio=0.97, 95% confidence interval=0.54-1.75; rs2476601: allelic P- value=0.86, odds ratio=1.04, 95% confidence interval=0.68-1.59). Similarly, the allelic combination analysis did not provide additional information. CONCLUSIONS Our results suggest that the studied polymorphisms of the PTPN22 gene do not play an important role in the pathophysiology of endogenous non-anterior uveitis.
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Affiliation(s)
- María Carmen Cénit
- Instituto de Parasitología y Biomedicina López-Neyra, IPBLN, CSIC, Granada, Spain
| | - Ana Márquez
- Instituto de Parasitología y Biomedicina López-Neyra, IPBLN, CSIC, Granada, Spain
| | | | | | - Victor Llorenç
- Ophthalmology Department, Hospital Clínic, Barcelona, Spain
| | - Joseba Artaraz
- Ophthalmology Department, Hospital de Cruces, Bilbao, Spain
| | - David Díaz Valle
- Ophthalmology Department, Hospital Clínico San Carlos, Madrid, Spain
| | - Ricardo Blanco
- Rheumatology Department, Hospital Marqués de Valdecilla, IFIMAV, Santander, Spain
| | - Joaquín Cañal
- Ophthalmology Department, Hospital Marqués de Valdecilla, IFIMAV, Santander, Spain
| | - David Salom
- Ophthalmology Department, Hospital Universitario La Fe, Valencia, Spain
| | | | - Enrique de Ramón
- Internal Medicine Department, Hospital Carlos Haya, Málaga, Spain
| | | | | | | | - Blanca Molins
- Instituto de Investigaciones Biomédicas, IDIBAPS, Hospital Clinic, Barcelona, Spain
| | | | - Javier Martín
- Instituto de Parasitología y Biomedicina López-Neyra, IPBLN, CSIC, Granada, Spain
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The genetics of Behçet’s disease in a Chinese population. Front Med 2012; 6:354-9. [DOI: 10.1007/s11684-012-0234-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Accepted: 10/11/2012] [Indexed: 12/14/2022]
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