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Hernandez-Nicols BF, Robledo-Pulido JJ, Alvarado-Navarro A. Etiopathogenesis of Psoriasis: Integration of Proposed Theories. Immunol Invest 2024; 53:348-415. [PMID: 38240030 DOI: 10.1080/08820139.2024.2302823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
Psoriasis is a chronic inflammatory disease characterized by squamous and erythematous plaques on the skin and the involvement of the immune system. Global prevalence for psoriasis has been reported around 1-3% with a higher incidence in adults and similar proportions between men and women. The risk factors associated with psoriasis are both extrinsic and intrinsic, out of which a polygenic predisposition is a highlight out of the latter. Psoriasis etiology is not yet fully described, but several hypothesis have been proposed: 1) the autoimmunity hypothesis is based on the over-expression of antimicrobial peptides such as LL-37, the proteins ADAMTSL5, K17, and hsp27, or lipids synthesized by the PLA2G4D enzyme, all of which may serve as autoantigens to promote the differentiation of autoreactive lymphocytes T and unleash a chronic inflammatory response; 2) dysbiosis of skin microbiota hypothesis in psoriasis has gained relevance due to the observations of a loss of diversity and the participation of pathogenic bacteria such as Streptococcus spp. or Staphylococcus spp. the fungi Malassezia spp. or Candida spp. and the virus HPV, HCV, or HIV in psoriatic plaques; 3) the oxidative stress hypothesis, the most recent one, describes that the cell injury and the release of proinflammatory mediators and antimicrobial peptides that leads to activate of the Th1/Th17 axis observed in psoriasis is caused by a higher release of reactive oxygen species and the imbalance between oxidant and antioxidant mechanisms. This review aims to describe the mechanisms involved in the three hypotheses on the etiopathogeneses of psoriasis.
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Affiliation(s)
- Brenda Fernanda Hernandez-Nicols
- Centro de Investigación en Inmunología y Dermatología, Departamento de Fisiología, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Mexico
| | - Juan José Robledo-Pulido
- Centro de Investigación en Inmunología y Dermatología, Departamento de Fisiología, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Mexico
| | - Anabell Alvarado-Navarro
- Centro de Investigación en Inmunología y Dermatología, Departamento de Fisiología, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Mexico
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2
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Sui JY, Eichenfield DZ, Sun BK. The role of enhancers in psoriasis and atopic dermatitis. Br J Dermatol 2023; 190:10-19. [PMID: 37658835 DOI: 10.1093/bjd/ljad321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 08/25/2023] [Accepted: 08/27/2023] [Indexed: 09/05/2023]
Abstract
Regulatory elements, particularly enhancers, play a crucial role in disease susceptibility and progression. Enhancers are DNA sequences that activate gene expression and can be affected by epigenetic modifications, interactions with transcription factors (TFs) or changes to the enhancer DNA sequence itself. Altered enhancer activity impacts gene expression and contributes to disease. In this review, we define enhancers and the experimental techniques used to identify and characterize them. We also discuss recent studies that examine how enhancers contribute to atopic dermatitis (AD) and psoriasis. Articles in the PubMed database were identified (from 1 January 2010 to 28 February 2023) that were relevant to enhancer variants, enhancer-associated TFs and enhancer histone modifications in psoriasis or AD. Most enhancers associated with these conditions regulate genes affecting epidermal homeostasis or immune function. These discoveries present potential therapeutic targets to complement existing treatment options for AD and psoriasis.
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Affiliation(s)
- Jennifer Y Sui
- Department of Dermatology, University of California San Diego School of Medicine, CA, USA
- Division of Pediatric and Adolescent Dermatology, Rady Children's Hospital of San Diego, CA, USA
| | - Dawn Z Eichenfield
- Department of Dermatology, University of California San Diego School of Medicine, CA, USA
- Division of Pediatric and Adolescent Dermatology, Rady Children's Hospital of San Diego, CA, USA
| | - Bryan K Sun
- Department of Dermatology, University of California San Diego School of Medicine, CA, USA
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3
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Farag AGA, Shoaib MAA, Labeeb AZ, Sleem AS, Hussien HAAEW, Elshaib ME, Hanout HMA. S100A8 (rs3806232) gene polymorphism and S100A8 serum level in psoriasis vulgaris patients: A preliminary study. J Cosmet Dermatol 2022; 21:4974-4982. [PMID: 35316567 DOI: 10.1111/jocd.14928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 02/06/2022] [Accepted: 03/17/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND S100A8 single nucleotide polymorphism (SNP) and S100A8 blood level are related to many inflammatory disorders with no available conclusion in psoriasis. AIM to evaluate the possible role of S100A8 in psoriasis pathogenesis through analyzing its S100A8 (rs3806232) gene polymorphism and S100A8 serum level in psoriasis vulgaris patients, in addition to correlate the detected results with severity psoriasis in those patients. METHODS This case-control study was conducted on 50 patients having psoriasis vulgaris, and 26 controls. Severity of psoriasis was evaluated using psoriasis area and severity index (PASI) score. S100A8 serum level and S100A8 (rs3806232) SNP were evaluated by ELISA and polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) respectively. RESULTS Serum S100A8 level was significantly higher in psoriatic patients than controls and was positively correlated with PASI score (r=0.826, p<0.001). S100A8 (rs3806232) AA genotype and A allele were significantly increased among psoriasis patients than controls (p<0.001) increasing risk of psoriasis development by about 5, 12 and 6 times than AG, GG and G allele. AA genotype was significantly associated with psoriasis severity (p=0.005), and high S100A8 serum levels (P= 0.018). CONCLUSIONS Circulating S100A8 could associated with disease severity and have an active role in psoriasis pathogenesis. S100A8 (rs3806232) SNP (AA genotype and A allele) might contribute to development and severity of psoriasis in the Egyptian population.
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Affiliation(s)
- Azza Gaber Antar Farag
- Dermatology, Andrology and STDs department, Faculty of Medicine, Menoufia University, Egypt
| | | | - Azza Zagloul Labeeb
- Microbiology and Immunology department, Faculty of Medicine, Menoufia University, Egypt
| | - Asmaa Shaaban Sleem
- Microbiology and Immunology department, Faculty of Medicine, Menoufia University, Egypt
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4
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Pathogenesis of psoriasis in the "omic" era. Part II. Genetic, genomic and epigenetic changes in psoriasis. Postepy Dermatol Alergol 2020; 37:283-298. [PMID: 32774210 PMCID: PMC7394158 DOI: 10.5114/ada.2020.96243] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 05/06/2020] [Indexed: 12/22/2022] Open
Abstract
Psoriasis is a multifactorial disease in which genetic, environmental and epigenetic factors regulating gene expression play a key role. In the “genomic era”, genome-wide association studies together with target genotyping platforms performed in different ethnic populations have found more than 50 genetic susceptible markers associated with the risk of psoriasis which have been identified so far. Up till now, the strongest association with the risk of the disease has been proved for HLA-C*06 gene. The majority of other psoriasis risk SNPs are situated near the genes encoding molecules involved in adaptive and innate immunity, and skin barrier function. Many contemporary studies indicate that the epigenetic changes: histone modification, promoter methylations, long non-coding and micro-RNA hyperexpression are considered as factors contributing to psoriasis pathogenesis as they regulate abnormal keratinocyte differentiation and proliferation, aberrant keratinocytes – inflammatory cells communication, neoangiogenesis and chronic inflammation. The circulating miRNAs detected in the blood may become specific markers in the diagnosis, prognosis and response to the treatment of the disease. The inhibition of expression in selected miRNAs may be a new promising therapy option for patients with psoriasis.
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5
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Abstract
Research on psoriasis pathogenesis has largely increased knowledge on skin biology in general. In the past 15 years, breakthroughs in the understanding of the pathogenesis of psoriasis have been translated into targeted and highly effective therapies providing fundamental insights into the pathogenesis of chronic inflammatory diseases with a dominant IL-23/Th17 axis. This review discusses the mechanisms involved in the initiation and development of the disease, as well as the therapeutic options that have arisen from the dissection of the inflammatory psoriatic pathways. Our discussion begins by addressing the inflammatory pathways and key cell types initiating and perpetuating psoriatic inflammation. Next, we describe the role of genetics, associated epigenetic mechanisms, and the interaction of the skin flora in the pathophysiology of psoriasis. Finally, we include a comprehensive review of well-established widely available therapies and novel targeted drugs.
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6
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Ovejero-Benito MC, Prieto-Pérez R, Llamas-Velasco M, Muñoz-Aceituno E, Reolid A, Saiz-Rodríguez M, Belmonte C, Román M, Ochoa D, Talegón M, Cabaleiro T, Daudén E, Abad-Santos F. Polymorphisms associated with adalimumab and infliximab response in moderate-to-severe plaque psoriasis. Pharmacogenomics 2018; 19:7-16. [DOI: 10.2217/pgs-2017-0143] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Aim: This study evaluated the influence of pharmacogenetics in psoriatic patients treated with adalimumab and/or infliximab. Materials & methods: Prospective observational study evaluating the association of 124 polymorphisms with the response to adalimumab or infliximab (PASI75) in patients with moderate-to-severe plaque psoriasis at 3 months (n = 95) and 6 months of treatment (n = 90). Significant SNPs for univariate analysis were subjected to multivariate analysis. Results: Five SNPs were associated with PASI75 at 3 months: rs6661932 (IVL), rs2546890 (IL-12B), rs2145623 (NFKBIA), rs9304742 (ZNF816A) and rs645544 (SLC9A8). Furthermore, rs1061624 (TNFR1B) was associated with PASI75 at 6 months. Conclusion: Nevertheless, these biomarkers should be validated in large-scale studies before implementation in clinical practice.
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Affiliation(s)
- María C Ovejero-Benito
- Department of Clinical Pharmacology, Hospital Universitario de la Princesa, Instituto Teófilo Hernando, Universidad Autónoma de Madrid (UAM), Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
| | - Rocío Prieto-Pérez
- Department of Clinical Pharmacology, Hospital Universitario de la Princesa, Instituto Teófilo Hernando, Universidad Autónoma de Madrid (UAM), Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
| | - Mar Llamas-Velasco
- Department of Dermatology, Hospital Universitario de la Princesa, Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
| | - Ester Muñoz-Aceituno
- Department of Dermatology, Hospital Universitario de la Princesa, Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
| | - Alejandra Reolid
- Department of Dermatology, Hospital Universitario de la Princesa, Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
| | - Miriam Saiz-Rodríguez
- Department of Clinical Pharmacology, Hospital Universitario de la Princesa, Instituto Teófilo Hernando, Universidad Autónoma de Madrid (UAM), Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
| | - Carmen Belmonte
- Department of Clinical Pharmacology, Hospital Universitario de la Princesa, Instituto Teófilo Hernando, Universidad Autónoma de Madrid (UAM), Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
| | - Manuel Román
- Department of Clinical Pharmacology, Hospital Universitario de la Princesa, Instituto Teófilo Hernando, Universidad Autónoma de Madrid (UAM), Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
- SCReN Spanish Clinical Research Network, UICEC del Hospital de La Princesa; Servicio de Farmacología Clínica, E28006, Madrid, Spain
| | - Dolores Ochoa
- Department of Clinical Pharmacology, Hospital Universitario de la Princesa, Instituto Teófilo Hernando, Universidad Autónoma de Madrid (UAM), Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
- SCReN Spanish Clinical Research Network, UICEC del Hospital de La Princesa; Servicio de Farmacología Clínica, E28006, Madrid, Spain
| | - María Talegón
- Department of Clinical Pharmacology, Hospital Universitario de la Princesa, Instituto Teófilo Hernando, Universidad Autónoma de Madrid (UAM), Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
| | - Teresa Cabaleiro
- Department of Clinical Pharmacology, Hospital Universitario de la Princesa, Instituto Teófilo Hernando, Universidad Autónoma de Madrid (UAM), Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
| | - Esteban Daudén
- Department of Dermatology, Hospital Universitario de la Princesa, Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
| | - Francisco Abad-Santos
- Department of Clinical Pharmacology, Hospital Universitario de la Princesa, Instituto Teófilo Hernando, Universidad Autónoma de Madrid (UAM), Instituto de Investigación Sanitaria la Princesa (IIS-IP), E28006, Madrid, Spain
- SCReN Spanish Clinical Research Network, UICEC del Hospital de La Princesa; Servicio de Farmacología Clínica, E28006, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Instituto de Salud Carlos III, E28029, Madrid, Spain
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7
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The Genetic Basis of Psoriasis. Int J Mol Sci 2017; 18:ijms18122526. [PMID: 29186830 PMCID: PMC5751129 DOI: 10.3390/ijms18122526] [Citation(s) in RCA: 133] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2017] [Revised: 11/21/2017] [Accepted: 11/22/2017] [Indexed: 12/16/2022] Open
Abstract
Psoriasis is widely regarded as a multifactorial condition which is caused by the interaction between inherited susceptibility alleles and environmental triggers. In the last decade, technological advances have enabled substantial progress in the understanding of disease genetics. Genome-wide association studies have identified more than 60 disease susceptibility regions, highlighting the pathogenic involvement of genes related to Th17 cell activation. This pathway has now been targeted by a new generation of biologics that have shown great efficacy in clinical trials. At the same time, the study of rare variants of psoriasis has identified interleukin (IL)-36 cytokines as important amplifiers of Th17 signaling and promising targets for therapeutic intervention. Here, we review these exciting discoveries, which highlight the translational potential of genetic studies.
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8
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Tervaniemi MH, Katayama S, Skoog T, Siitonen HA, Vuola J, Nuutila K, Sormunen R, Johnsson A, Linnarsson S, Suomela S, Kankuri E, Kere J, Elomaa O. NOD-like receptor signaling and inflammasome-related pathways are highlighted in psoriatic epidermis. Sci Rep 2016; 6:22745. [PMID: 26976200 PMCID: PMC4792137 DOI: 10.1038/srep22745] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 02/19/2016] [Indexed: 02/08/2023] Open
Abstract
Psoriatic skin differs distinctly from normal skin by its thickened epidermis. Most gene expression comparisons utilize full-thickness biopsies, with substantial amount of dermis. We assayed the transcriptomes of normal, lesional, and non-lesional psoriatic epidermis, sampled as split-thickness skin grafts, with 5′-end RNA sequencing. We found that psoriatic epidermis contains more mRNA per total RNA than controls, and took this into account in the bioinformatic analysis. The approach highlighted innate immunity-related pathways in psoriasis, including NOD-like receptor (NLR) signaling and inflammasome activation. We demonstrated that the NLR signaling genes NOD2, PYCARD, CARD6, and IFI16 are upregulated in psoriatic epidermis, and strengthened these findings by protein expression. Interestingly, PYCARD, the key component of the inflammasome, showed an altered expression pattern in the lesional epidermis. The profiling of non-lesional skin highlighted PSORS4 and mitochondrially encoded transcripts, suggesting that their gene expression is altered already before the development of lesions. Our data suggest that all components needed for the active inflammasome are present in the keratinocytes of psoriatic skin. The characterization of inflammasome pathways provides further opportunities for therapy. Complementing previous transcriptome studies, our approach gives deeper insight into the gene regulation in psoriatic epidermis.
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Affiliation(s)
- Mari H Tervaniemi
- Folkhälsan Institute of Genetics, Helsinki, Finland.,Department of Medical and Clinical Genetics, Medicum and Research Programs Unit, Molecular Neurology, University of Helsinki, Helsinki, Finland
| | - Shintaro Katayama
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden.,Science for Life Laboratory, Solna, Sweden
| | - Tiina Skoog
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - H Annika Siitonen
- Folkhälsan Institute of Genetics, Helsinki, Finland.,Department of Medical and Clinical Genetics, Medicum and Research Programs Unit, Molecular Neurology, University of Helsinki, Helsinki, Finland
| | - Jyrki Vuola
- Helsinki Burn Center, Department of Plastic Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Kristo Nuutila
- Department of Pharmacology, Medicum, University of Helsinki, Helsinki, Finland
| | - Raija Sormunen
- Biocenter Oulu, Department of Pathology, University of Oulu, Oulu, Finland
| | - Anna Johnsson
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Sten Linnarsson
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Sari Suomela
- Department of Dermatology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Esko Kankuri
- Department of Pharmacology, Medicum, University of Helsinki, Helsinki, Finland
| | - Juha Kere
- Folkhälsan Institute of Genetics, Helsinki, Finland.,Department of Medical and Clinical Genetics, Medicum and Research Programs Unit, Molecular Neurology, University of Helsinki, Helsinki, Finland.,Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden.,Science for Life Laboratory, Solna, Sweden
| | - Outi Elomaa
- Folkhälsan Institute of Genetics, Helsinki, Finland.,Department of Medical and Clinical Genetics, Medicum and Research Programs Unit, Molecular Neurology, University of Helsinki, Helsinki, Finland
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9
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Mabuchi T, Ota T, Manabe Y, Ikoma N, Ozawa A, Terui T, Ikeda S, Inoko H, Oka A. HLA-C*12:02 is a susceptibility factor in late-onset type of psoriasis in Japanese. J Dermatol 2015; 41:697-704. [PMID: 25099155 DOI: 10.1111/1346-8138.12569] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Accepted: 06/11/2014] [Indexed: 11/29/2022]
Abstract
Psoriasis is thought to be a multifactorial disease triggered by both genetic and environmental factors. The HLA-C locus on chromosome 6p21.33 remains the strongest susceptibility candidate locus in psoriasis. The strong association between psoriasis and the HLA-Cw6 allele has been well documented in various races. It is known that psoriatic patients with early onset are more likely to be familial and associated with HLA-Cw6. Familial occurrence of Japanese psoriasis is smaller than other populations. Furthermore, males are predominant over females in Japanese psoriasis. We investigated the relation between HLA-C alleles and age of onset, and in each gender for Japanese psoriasis, and discuss male predominance in the incidence of psoriasis in Japan. Four hundred forty six unrelated Japanese patients with psoriasis vulgaris and 557 sex- and age-matched unrelated Japanese healthy controls were investigated by genotyping. We confirmed the association between early-onset type of psoriasis with HLA-C*06:02 allele in Japanese. In addition, we detected the association between the late-onset type of psoriasis and the HLA-C*12:02 allele in Japanese. No significant differences in allele frequency were observed between females and males. Our results suggest that there is no genetic factor effect on male predominance in Japanese. In contract, the effect of environmental risk factors on the onset of Japanese psoriatic patients is stronger in males than in females. As a result, male predominant in psoriasis may occur in Japan.
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Affiliation(s)
- Tomotaka Mabuchi
- Department of Dermatology, Tokai University School of Medicine, Isehara, Japan
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10
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Cubillos S, Jaradat SW, Walther M, Truta-Feles K, Koehler MJ, Norgauer J. Association of S100A7 gene polymorphisms with manifestations of common types of psoriasis: effect on serum calcium levels. Exp Dermatol 2015; 24:894-6. [PMID: 26173840 DOI: 10.1111/exd.12799] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/01/2015] [Indexed: 12/18/2022]
Affiliation(s)
- Susana Cubillos
- Department of Dermatology, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany
| | - Sameh W Jaradat
- Department of Dermatology, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany
| | - Mario Walther
- Institute of Medical Statistics, Computer Sciences and Documentation, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany
| | - Kristina Truta-Feles
- Department of Dermatology, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany
| | - Martin J Koehler
- Department of Dermatology, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany
| | - Johannes Norgauer
- Department of Dermatology, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany
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11
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Abstract
Psoriasis is a common and debilitating immune-mediated skin disease with a complex genetic basis. Genetic studies have provided critical insights into the pathogenesis of disease. This article focuses on the results of genetic association studies, which provide evidence that psoriasis susceptibility genes are involved in innate and adaptive immunity and skin barrier functions. The potential for disease stratification and the development of more effective treatments with fewer side effects using genetic data are highlighted.
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Affiliation(s)
- Satveer K Mahil
- Division of Genetics and Molecular Medicine, St John's Institute of Dermatology, Guy's and St Thomas' NHS Foundation Trust, King's College London, 9th Floor, Tower Wing, London SE1 9RT, UK
| | - Francesca Capon
- Division of Genetics and Molecular Medicine, King's College London, Guy's Hospital, 9th Floor, Tower Wing, London, SE1 9RT, UK
| | - Jonathan N Barker
- Division of Genetics and Molecular Medicine, St John's Institute of Dermatology, Guy's and St Thomas' NHS Foundation Trust, King's College London, 9th Floor, Tower Wing, London SE1 9RT, UK.
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12
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Affiliation(s)
- J Barker
- St John's Institute of Dermatology, King's College London, Guy's Hospital Campus, 9th Floor, Tower Wing, London, SE1 9RT, U.K..
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13
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Bai J, Liu Z, Xu Z, Ke F, Zhang L, Zhu H, Lou F, Wang H, Fei Y, Shi YL, Wang H. Epigenetic Downregulation of SFRP4 Contributes to Epidermal Hyperplasia in Psoriasis. THE JOURNAL OF IMMUNOLOGY 2015; 194:4185-98. [DOI: 10.4049/jimmunol.1403196] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 03/01/2015] [Indexed: 12/24/2022]
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14
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Chandra A, Ray A, Senapati S, Chatterjee R. Genetic and epigenetic basis of psoriasis pathogenesis. Mol Immunol 2015; 64:313-23. [PMID: 25594889 DOI: 10.1016/j.molimm.2014.12.014] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 12/20/2014] [Accepted: 12/26/2014] [Indexed: 01/06/2023]
Abstract
Psoriasis is a chronic inflammatory skin disease whose prevalence varies among different populations worldwide. It is a complex multi-factorial disease and the exact etiology is largely unknown. Family based studies have indicated a genetic predisposition; however they cannot fully explain the disease pathogenesis. In addition to genetic susceptibility, environmental as well as gender and age related factors were also been found to be associated. Recently, imbalances in epigenetic networks are indicated to be causative elements in psoriasis. The present knowledge of epigenetic involvement, mainly the DNA methylation, chromatin modifications and miRNA deregulation is surveyed here. An integrated approach considering genetic and epigenetic anomalies in the light of immunological network may explore the pathogenesis of psoriasis.
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Affiliation(s)
- Aditi Chandra
- Human Genetics Unit, Indian Statistical Institute, 203 B. T. Road, Kolkata 700108, India
| | - Aditi Ray
- Human Genetics Unit, Indian Statistical Institute, 203 B. T. Road, Kolkata 700108, India
| | | | - Raghunath Chatterjee
- Human Genetics Unit, Indian Statistical Institute, 203 B. T. Road, Kolkata 700108, India.
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15
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Abstract
The skin is composed of a variety of cell types expressing specific molecules and possessing different properties that facilitate the complex interactions and intercellular communication essential for maintaining the structural integrity of the skin. Importantly, a single mutation in one of these molecules can disrupt the entire organization and function of these essential networks, leading to cell separation, blistering, and other striking phenotypes observed in inherited skin diseases. Over the past several decades, the genetic basis of many monogenic skin diseases has been elucidated using classical genetic techniques. Importantly, the findings from these studies has shed light onto the many classes of molecules and essential genetic as well as molecular interactions that lend the skin its rigid, yet flexible properties. With the advent of the human genome project, next-generation sequencing techniques, as well as several other recently developed methods, tremendous progress has been made in dissecting the genetic architecture of complex, non-Mendelian skin diseases.
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Affiliation(s)
- Gina M DeStefano
- Department of Genetics and Development, Columbia University, New York, New York 10032
| | - Angela M Christiano
- Department of Genetics and Development, Columbia University, New York, New York 10032 Department of Dermatology, Columbia University, New York, New York 10032
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16
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Gnanaraj P, Dayalan H, Elango T, Malligarjunan H, Raghavan V, Rao R. Downregulation of involucrin in psoriatic lesions following therapy with propylthiouracil, an anti-thyroid thioureylene: immunohistochemistry and gene expression analysis. Int J Dermatol 2014; 54:302-6. [DOI: 10.1111/ijd.12565] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pushpa Gnanaraj
- Department of Dermatology; Sri Ramaswamy Memorial (SRM) Medical College Hospital and Research Center; Kattankulathur Kancheepuram India
| | - Haripriya Dayalan
- Department of Medical Research; Sri Ramaswamy Memorial (SRM) Medical College Hospital and Research Center; Kattankulathur Kancheepuram India
| | - Tamilselvi Elango
- Department of Medical Research; Sri Ramaswamy Memorial (SRM) Medical College Hospital and Research Center; Kattankulathur Kancheepuram India
| | - Hemamalini Malligarjunan
- Department of Medical Research; Sri Ramaswamy Memorial (SRM) Medical College Hospital and Research Center; Kattankulathur Kancheepuram India
| | - Vijayashree Raghavan
- Department of Pathology; Chettinad Hospital and Research Institute; Kelambakkam Chennai India
| | - Ramesh Rao
- Department of Pathology; Chettinad Hospital and Research Institute; Kelambakkam Chennai India
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19
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Abstract
Ichthyosis vulgaris is caused by loss-of-function mutations in the filaggrin gene (FLG) and is characterized clinically by xerosis, scaling, keratosis pilaris, palmar and plantar hyperlinearity, and a strong association with atopic disorders. According to the published studies presented in this review article, FLG mutations are observed in approximately 7·7% of Europeans and 3·0% of Asians, but appear to be infrequent in darker-skinned populations. This clinical review article provides an overview of ichthyosis vulgaris epidemiology, related disorders and pathomechanisms. Not only does ichthyosis vulgaris possess a wide clinical spectrum, recent studies suggest that carriers of FLG mutations may have a generally altered risk of developing common diseases, even beyond atopic disorders. Mechanistic studies have shown increased penetration of allergens and chemicals in filaggrin-deficient skin, and epidemiological studies have found higher levels of hand eczema, irritant contact dermatitis, nickel sensitization and serum vitamin D levels. When relevant, individuals should be informed about an increased risk of developing dermatitis when repeatedly or continuously exposed to nickel or irritants. Moreover, with our current knowledge, individuals with ichthyosis vulgaris should be protected against neonatal exposure to cats to prevent atopic dermatitis and should abstain from smoking to prevent asthma. Finally, they should be advised against excessive exposure to factors that decrease skin barrier functions and increase the risk of atopic dermatitis.
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Affiliation(s)
- J P Thyssen
- Dermatology Service, Veterans Affairs Medical Center, and Department of Dermatology, UCSF, 4150 Clement Street, San Francisco, CA 94121, USA.
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Bergboer JG, Zeeuwen PL, Schalkwijk J. Genetics of Psoriasis: Evidence for Epistatic Interaction between Skin Barrier Abnormalities and Immune Deviation. J Invest Dermatol 2012; 132:2320-2331. [DOI: 10.1038/jid.2012.167] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Wolf R, Orion E, Ruocco E, Ruocco V. Abnormal epidermal barrier in the pathogenesis of psoriasis. Clin Dermatol 2012; 30:323-8. [PMID: 22507047 DOI: 10.1016/j.clindermatol.2011.08.022] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Almost 2 decades ago, Williams and Elias suggested a unifying concept for the pathogenesis of disorders of cornification, according to which the integrity of the epidermal barrier and its effective function is an important factor in the regulation of epidermal DNA synthesis. Interference with the barrier integrity or function will result in epidermal hyperplasia and may be the primary event leading to hyperproliferative skin diseases, such as psoriasis. We have analyzed alterations to several structures of the epidermal barrier that might be responsible for barrier dysfunction and thus lead to hyperproliferation of the epidermis in an attempt to repair the barrier and, as a result, might be inducers of psoriasis. There are several convincing reports indicating that inhibiting of epidermal transglutaminase may lead to epidermal hyperproliferation and that this stimulus might trigger psoriasis among genetically predisposed patients. Disturbance of epidermal barrier function caused by derangement of lipid or cholesterol or ceramide synthesis leads to increased DNA synthesis and epidermal hyperplasia and as a result might be an inducer of psoriasis. We could find little evidence to show that defective defense of the epidermis or an abnormal response of it to bacteria plays a role in the pathogenesis of psoriasis. Accumulating data indicate that there is an association of psoriasis and mutations of genes within the epidermal differentiation complex, which are crucial for the development, maturation, cornification, cross-linking, and terminal differentiation of the epidermis, called psoriasis susceptibility locus 4.
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Affiliation(s)
- Ronni Wolf
- Dermatology Unit, Kaplan Medical Center, Rehovot 76100, Israel.
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Identification of chromosome abnormalities in screening of a family with manic depression and psoriasis: predisposition to aneuploidy. Asian J Psychiatr 2012; 5:169-74. [PMID: 22813662 DOI: 10.1016/j.ajp.2012.02.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Revised: 02/09/2012] [Accepted: 02/10/2012] [Indexed: 11/21/2022]
Abstract
Cytogenetic analysis is an important stage in understanding the genetic background of manic depression (MD), and may provide a valuable clue to the identification of target loci and successful search for major genes. In order to identify chromosomal regions we aimed to detect the relationships between chromosomal aberrations (CAs) and immunological markers in a family with MD and psoriasis. We used the cell cultivation and conventional G-banding. We found predominantly numerical aberrations. The most common aneuploidy was chromosome 8, followed by chromosome 22, 21, 15, X and Y. However, structural aberrations consisted of duplications, deletions, translocations and breaks, with a focus on: loci on del(1)(q12-q23), del(1)(q21.1-q24), del(1)(q21.1-q23), del(10)(p11.2-pter), der(2)t(2;4)(p25;p12), t(2;22)(p14;p13), t(19;Y)? and dup(10)(q26). The susceptibility genes of MD or psoriasis may be located on these loci. Numerical sex CAs included 4(5.8%) with 45,X, 3(4.3%) with 47,XXY, and 4(5.8%) with structural chromosome X; del(X)(q13); del(X)(p11-pter) del(X)(q21.3) and inv(Y)(q11.2). We also conducted an immunological study. According results of this study, the percentage of CD2+, CD4+ and CD8+ lymphocytes of the father were significantly higher, whereas CD4+ lymphocytes were decreased in the mother, when compared the healthy persons. The percentage of CD4 level of the son was decreased, whereas CD8+ lymphocytes were higher. The CD4/CD8 ratio of the father and the son was found to be significantly high. These results may suggest that MD and psoriasis have a significant impact on both genetic and immunological parameters.
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Hu Z, Xiong Z, Xu X, Li F, Lu L, Li W, Su J, Liu Y, Liu D, Xie Z, Peng Y, Kuang Y, Wu L, Zhang J, Pan Q, Tang B, Chen X, Xia K. Loss-of-function mutations in filaggrin gene associate with psoriasis vulgaris in Chinese population. Hum Genet 2012; 131:1269-74. [PMID: 22407025 DOI: 10.1007/s00439-012-1155-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Accepted: 02/27/2012] [Indexed: 02/08/2023]
Abstract
Loss-of-function mutations in filaggrin gene (FLG; OMIM #135940) have been reported to cause the semi-dominant keratinizing disorders such as ichthyosis vulgaris (IV; OMIM #146700) and atopic dermatitis (AD; OMIM #605803). Recent linkage analysis and immunohistochemical studies suggest the possible contribution of FLG to psoriatic susceptibility. However, no susceptibility variant in FLG gene associated with psoriasis (OMIM #177900) has been identified. In this study, we identified a non-sense mutation of FLG (p.K4022X) in a Chinese psoriasis/IV coexisting family. The homozygous p.K4022X mutation was detected in a psoriasis patient, whereas the heterozygous p.K4022X mutation was identified in two IV patients and four apparently normal family members. We also genotyped p.K4022X variant in 441 sporadic Chinese psoriasis patients and found homozygous mutation in two patients, while no homozygous variant was found in 500 control individuals. After sequencing the entire coding region of FLG gene in 441 psoriasis patients, we identified another five mutations (p.R826X, p.W2583X, c.7945delA, c.3321delA and p.Q2417X). Although all six FLG mutations as a whole was not significantly associated with psoriasis (P = 0.105), mutation p.K4022X was significantly associated with psoriasis (P < 0.05). Our data thus indicates an association of FLG with psoriasis in Chinese population.
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Affiliation(s)
- Zhengmao Hu
- State Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan, China
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OKA A, MABUCHI T, OZAWA A, INOKO H. Current understanding of human genetics and genetic analysis of psoriasis. J Dermatol 2012; 39:231-41. [DOI: 10.1111/j.1346-8138.2012.01504.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Abstract
Psoriasis is a common relapsing and remitting immune-mediated inflammatory disease that affects the skin and joints. This review focuses on current immunogenetic concepts, key cellular players, and axes of cytokines that are thought to contribute to disease pathogenesis. We highlight potential therapeutic targets and give an overview of the currently used immune-targeted therapies.
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Affiliation(s)
- Gayathri K Perera
- St. John's Institute of Dermatology, King's College London, London SE1 9RT, United Kingdom.
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Finzel S, Englbrecht M. [Psoriatic arthritis : a permanent challenge for rheumatologists and patients--Part 1: epidemiology, pathogenesis and clinical course]. Z Rheumatol 2011; 70:685-97. [PMID: 21912984 DOI: 10.1007/s00393-011-0860-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Psoriatic arthritis is still one of the big challenges in rheumatology due to the great variety of symptoms. Treatment frequently requires an interdisciplinary collaboration of general practitioners, dermatologists and rheumatologists who are able to recognize the onset of disease early by means of classification criteria and new imaging techniques followed by the implementation of appropriate antirheumatic treatment. During recent years new immunological pathways have been discovered leading to an increasing number of potential therapies, which increases the chance to find effective individualized treatment. However, tracking back the onset of the disease to specific causes is still a challenge which is made even more complex due to the absence of specific serum parameters.
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Affiliation(s)
- S Finzel
- Medizinische Klinik III (Rheumatologie & Immunologie), Universitätsklinikum Erlangen, Ulmenweg 18, 91054, Erlangen, Deutschland.
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Genetics of Psoriasis - Short Resume. ACTA MEDICA MARTINIANA 2011. [DOI: 10.2478/v10201-011-0001-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Chen XY, Jin LW, Chen YW, Tian H, Yuan WT, Niu ZM, Zhang J, Huang W, Zheng J. The association between the IL-20-1723C→G allele on the 1q chromosome and psoriasis triggered or exacerbated by an upper respiratory tract infection in the Chinese Han population. Dermatology 2010; 222:24-30. [PMID: 21109726 DOI: 10.1159/000320772] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2010] [Accepted: 08/30/2010] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Psoriasis is a cutaneous disorder of multifactorial etiology influenced by both genetic and environmental factors such as infection. METHODS We conducted a genome analysis with 20 microsatellite markers spanning the long arm of chromosome 1 in 36 Chinese families with psoriasis and detected evidence for linkage at 1q21 with a nonparametric linkage score of 1.74, p=0.03, and 1q32 with one of 1.84, p=0.03. According to the positional and functional candidate principle, we further investigated the single-nucleotide polymorphisms of the HAX-1 gene (located in 1q21) and IL-20 gene (located in 1q32) in a case-control study including 340 sporadic patients and 199 controls. RESULTS We determined that the frequency of the G allele of IL-20-1723C→G (rs1713239) was significantly higher among psoriatic patients (38.5% in cases vs. 31.2% in controls, p=0.015, odds ratio, OR=1.39, 95% confidence interval, CI=1.07-1.80). When we stratified our analysis by psoriasis triggered or exacerbated by infection of the upper respiratory tract, a significant difference was detected (42.4% in stratified cases vs. 31.2% in controls, p=0.005, OR=1.63, 95% CI=1.15-2.30). CONCLUSION We assume that triggered or exacerbated by respiratory tract infection, the population with the G allele of IL-20-1723C→G are predisposed to psoriasis.
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Affiliation(s)
- Xiao-Ying Chen
- Department of Dermatology, Ruijin Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
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Blumberg H, Dinh H, Dean C, Trueblood ES, Bailey K, Shows D, Bhagavathula N, Aslam MN, Varani J, Towne JE, Sims JE. IL-1RL2 and its ligands contribute to the cytokine network in psoriasis. THE JOURNAL OF IMMUNOLOGY 2010; 185:4354-62. [PMID: 20833839 DOI: 10.4049/jimmunol.1000313] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Psoriasis is a common immune-mediated disease in European populations; it is characterized by inflammation and altered epidermal differentiation leading to redness and scaling. T cells are thought to be the main driver, but there is also evidence for an epidermal contribution. In this article, we show that treatment of mouse skin overexpressing the IL-1 family member, IL-1F6, with phorbol ester leads to an inflammatory condition with macroscopic and histological similarities to human psoriasis. Inflammatory cytokines thought to be important in psoriasis, such as TNF-α, IL-17A, and IL-23, are upregulated in the mouse skin. These cytokines are induced by and can induce IL-1F6 and related IL-1 family cytokines. Inhibition of TNF or IL-23 inhibits the increased epidermal thickness, inflammation, and cytokine production. Blockade of IL-1F6 receptor also resolves the inflammatory changes in human psoriatic lesional skin transplanted onto immunodeficient mice. These data suggest a role for IL-1F family members in psoriasis.
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Duffin KC, Woodcock J, Krueger GG. Genetic variations associated with psoriasis and psoriatic arthritis found by genome-wide association. Dermatol Ther 2010; 23:101-13. [PMID: 20415816 DOI: 10.1111/j.1529-8019.2010.01303.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Psoriasis and psoriatic arthritis are immune disorders with a complex polygenic basis. HLA-Cw6, which lies in the major histocompatibility region on chromosome 6, is considered the major genetic determinant of psoriasis. Recent genome-wide association studies have identified new variants outside of the MHC with relevance to the immunology of psoriasis. Variants in or near genes that encode subunits of cytokines (IL12B, IL23A) or cytokine receptors (IL23R) are interesting given that the gene product of IL12B, p40, is the target of a recently approved monoclonal antibody therapy for psoriasis (ustekinumab). Association with psoriasis and psoriatic arthritis has been found in TNFAIP3 and TNFIP1, ubiquitin ligases in the NF-kappaB pathway, and IL13, a Th2 cytokine. Copy number variation of human beta-defensin and late cornified envelope genes also associate with psoriasis. Many of these genetic variations also associate with immune disorders considered psoriatic co-morbidities, including Crohn's disease and diabetes.
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Coto E, Santos-Juanes J, Coto-Segura P, Díaz M, Soto J, Queiro R, Alvarez V. Mutation analysis of the LCE3B/LCE3C genes in Psoriasis. BMC MEDICAL GENETICS 2010; 11:45. [PMID: 20331852 PMCID: PMC2859809 DOI: 10.1186/1471-2350-11-45] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2009] [Accepted: 03/23/2010] [Indexed: 11/12/2022]
Abstract
Background An association between a common deletion comprising the late cornified envelope LCE3B and LCE3C genes (LCE3C_LCE3B-del) and Psoriasis (Ps) has been reported. The expression of these LCE genes was induced after skin barrier disruption and was also strong in psoriatic lesions. The damage to the skin barrier could trigger an epidermal response that includes the expression of genes involved in the formation of skin barrier. Methods We determined the LCE3C_LCE3B-del genotype in 405 Ps patients and 400 healthy controls from a Northern Spain region (Asturias). These patients and controls were also genotyped for the rs4112788 single nucleotide polymorphism, in strong linkage disequilibrium with the LCE3C_B cluster. The LCE3B and LCE3C gene variant was determined in the patients through SSCA, DHPLC, and direct sequencing. Results Allele and genotype frequencies did not differ between patients and controls for the rs4112788 and LCE3C_LCE3B-del polymorphisms. However, del/del homozygotes were significantly higher among patients with chronic plaque type Ps who did not develop arthritis (p = 0.03; OR = 1.4; 95%CI = 1.03-1.92). The analysis of the coding sequence of LCE3B and LCE3C in the patients who had at least one copy of this showed that only one patient has a no previously reported LCE3B variant (R68C). Conclusion Our work suggested that homozygosity for a common LCE3C_LCE3B deletion contributes to the risk of developing chronic plaque type Ps without psoriatic arthritis. Our work confirmed previous reports that described an association of this marker with only skin manifestations, and supported the concept of different genetic risk factors contributing to skin and joint disease.
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Affiliation(s)
- Eliecer Coto
- Genética Molecular, Hospital Universitario Central Asturias-Servicio de Salud del Principado de Asturias, Oviedo, Spain.
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Replication of LCE3C-LCE3B CNV as a risk factor for psoriasis and analysis of interaction with other genetic risk factors. J Invest Dermatol 2009; 130:979-84. [PMID: 20016497 DOI: 10.1038/jid.2009.385] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Recently, a deletion of two late cornified envelope (LCE) genes within the epidermal differentiation complex on chromosome 1 was shown to be overrepresented in 1,426 psoriasis vulgaris (PsV) patients of European ancestry. In this study, we report a confirmation of this finding in 1,354 PsV patients and 937 control individuals of German origin. We found an allele frequency of the deletion of 70.9% in PsV patients and of 64.9% in control individuals (chi(2)=17.44, P=2.97 x 10(-5), odds ratio (95% confidence interval)=1.31 (1.15-1.48)). The overall copy number of the two LCE genes had no influence on the age of onset, but we observed a dosage effect at the genotype level. There was no evidence of statistically significant interaction with copy number of the beta-defensin cluster on 8p23.1 or with an IL-23R pathway variant in a combined data set of German and Dutch individuals, whereas evidence for interaction with the PSORS1 risk allele in German individuals was marginal and did not remain significant after correction for multiple testing. Our study confirms the recently published finding that the deletion of the two LCE genes is a susceptibility factor for PsV with dosage effect, while, because of power limitation, no final conclusion regarding interaction with other PsV risk factors can be made at this stage.
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Elder JT, Bruce AT, Gudjonsson JE, Johnston A, Stuart PE, Tejasvi T, Voorhees JJ, Abecasis GR, Nair RP. Molecular dissection of psoriasis: integrating genetics and biology. J Invest Dermatol 2009; 130:1213-26. [PMID: 19812592 DOI: 10.1038/jid.2009.319] [Citation(s) in RCA: 207] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Psoriasis is a common and debilitating disease of the skin, nails, and joints, with an acknowledged but complex genetic basis. Early genome-wide linkage studies of psoriasis focused on segregation of microsatellite markers in families; however, the only locus consistently identified resided in the major histocompatibility complex. Subsequently, several groups mapped this locus to the vicinity of HLA-C, and two groups have reported HLA-Cw6 itself to be the major susceptibility allele. More recently, the development of millions of single-nucleotide polymorphisms, coupled with the development of high-throughput genotyping platforms and a comprehensive map of human haplotypes, has made possible a genome-wide association approach using cases and controls rather than families. Taking advantage of these developments, we participated in a collaborative genome-wide association study of psoriasis involving thousands of cases and controls. Initial analysis of these data revealed and/or confirmed association between psoriasis and seven genetic loci-HLA-C, IL12B, IL23R, IL23A, IL4/IL13, TNFAIP3, and TNIP1-and ongoing studies are revealing additional loci. Here, we review the epidemiology, immunopathology, and genetics of psoriasis, and present a disease model integrating its genetics and immunology.
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Affiliation(s)
- James T Elder
- Department of Dermatology, University of Michigan Medical School, Ann Arbor, Michigan, USA.
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Batliwalla FM, Li W, Ritchlin CT, Xiao X, Brenner M, Laragione T, Shao T, Durham R, Kemshetti S, Schwarz E, Coe R, Kern M, Baechler EC, Behrens TW, Gregersen PK, Gulko PS. Microarray analyses of peripheral blood cells identifies unique gene expression signature in psoriatic arthritis. Mol Med 2009; 11:21-9. [PMID: 16622521 PMCID: PMC1449519 DOI: 10.2119/2006-00003.gulko] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2006] [Accepted: 03/13/2006] [Indexed: 01/01/2023] Open
Abstract
Psoriatic arthritis (PsA) is a chronic and erosive form of arthritis of unknown cause. We aimed to characterize the PsA phenotype using gene expression profiling and comparing it with healthy control subjects and patients rheumatoid arthritis (RA). Peripheral blood cells (PBCs) of 19 patients with active PsA and 19 age- and sex-matched control subjects were used in the analyses of PsA, with blood samples collected in PaxGene tubes. A significant alteration in the pattern of expression of 313 genes was noted in the PBCs of PsA patients on Affymetrix U133A arrays: 257 genes were expressed at reduced levels in PsA, and 56 genes were expressed at increased levels, compared with controls. Downregulated genes tended to cluster to certain chromosomal regions, including those containing the psoriasis susceptibility loci PSORS1 and PSORS2. Among the genes with the most significantly reduced expression were those involved in downregulation or suppression of innate and acquired immune responses, such as SIGIRR, STAT3, SHP1, IKBKB, IL-11RA, and TCF7, suggesting inappropriate control that favors proin-flammatory responses. Several members of the MAPK signaling pathway and tumor suppressor genes showed reduced expression. Three proinflammatory genes--S100A8, S100A12, and thioredoxin--showed increased expression. Logistic regression and recursive partitioning analysis determined that one gene, nucleoporin 62 kDa, could correctly classify all controls and 94.7% of the PsA patients. Using a dataset of 48 RA samples for comparison, the combination of two genes, MAP3K3 followed by CACNA1S, was enough to correctly classify all RA and PsA patients. Thus, PBC gene expression profiling identified a gene expression signature that differentiated PsA from RA, and PsA from controls. Several novel genes were differentially expressed in PsA and may prove to be diagnostic biomarkers or serve as new targets for the development of therapies.
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Affiliation(s)
- Franak M. Batliwalla
- Robert S. Boas Center for Genomics and Human Genetics, Feinstein Institute for Medical Research
- Department of Medicine, New York University School of Medicine, New York, NY, USA
| | - Wentian Li
- Robert S. Boas Center for Genomics and Human Genetics, Feinstein Institute for Medical Research
| | - Christopher T. Ritchlin
- Division of Rheumatology, Department of Medicine, University of Rochester, Rochester, NY, USA
| | - Xiangli Xiao
- Robert S. Boas Center for Genomics and Human Genetics, Feinstein Institute for Medical Research
| | - Max Brenner
- Robert S. Boas Center for Genomics and Human Genetics, Feinstein Institute for Medical Research
- North Shore-LIJ Graduate School of Molecular Medicine, Manhasset, NY, USA
| | - Teresina Laragione
- Robert S. Boas Center for Genomics and Human Genetics, Feinstein Institute for Medical Research
| | - Tianmeng Shao
- Division of Rheumatology, Department of Medicine, University of Rochester, Rochester, NY, USA
| | - Robert Durham
- Division of Rheumatology, Department of Medicine, University of Rochester, Rochester, NY, USA
| | - Sunil Kemshetti
- Division of Rheumatology, Department of Medicine, University of Rochester, Rochester, NY, USA
| | - Edward Schwarz
- Division of Rheumatology, Department of Medicine, University of Rochester, Rochester, NY, USA
| | - Rodney Coe
- Robert S. Boas Center for Genomics and Human Genetics, Feinstein Institute for Medical Research
| | - Marlena Kern
- Robert S. Boas Center for Genomics and Human Genetics, Feinstein Institute for Medical Research
| | - Emily C. Baechler
- Division of Rheumatic and Autoimmune Diseases, Department of Medicine, University of Minnesota, Minneapolis, MN, USA
| | - Timothy W. Behrens
- Division of Rheumatic and Autoimmune Diseases, Department of Medicine, University of Minnesota, Minneapolis, MN, USA
| | - Peter K. Gregersen
- Robert S. Boas Center for Genomics and Human Genetics, Feinstein Institute for Medical Research
- Division of Rheumatology, Department of Medicine, North Shore University Hospital, Manhasset, NY, USA
- Department of Medicine, New York University School of Medicine, New York, NY, USA
| | - Pércio S. Gulko
- Robert S. Boas Center for Genomics and Human Genetics, Feinstein Institute for Medical Research
- Division of Rheumatology, Department of Medicine, North Shore University Hospital, Manhasset, NY, USA
- Department of Medicine, New York University School of Medicine, New York, NY, USA
- Address correspondence and reprint requests to Pércio S. Gulko, Robert S. Boas Center for Genomics and Human Genetics, Feinstein Institute for Medical Research, 350 Community Drive, Room 139, Manhasset, NY 11030. Phone: 516-562-1275; fax: 516-562-1153; e-mail:
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Hüffmeier U, Estivill X, Riveira-Munoz E, Traupe H, Wendler J, Lohmann J, Böhm B, Burkhardt H, Reis A. Deletion of LCE3C and LCE3B genes at PSORS4 does not contribute to susceptibility to psoriatic arthritis in German patients. Ann Rheum Dis 2009; 69:876-8. [PMID: 19439430 PMCID: PMC2925148 DOI: 10.1136/ard.2009.108951] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Introduction Psoriasis susceptibility locus 4 (PSORS4) is a susceptibility locus for psoriasis vulgaris (PsV), a common inflammatory, hyperproliferative skin disorder. Recently, a deletion of 2 late cornified envelope (LCE) genes within epidermal differentiation complex on chromosome 1 was shown to be enriched in 1426 patients with PsV, suggesting compromised barrier function in deletion carriers. This genetic association was subsequently confirmed in a German cohort. Methods In order to investigate whether this variant also predisposes to psoriatic arthritis (PsA), this deletion and 3 single nucleotide polymorphisms (SNPs) in strong linkage disequilibrium with it were genotyped in a case-control cohort of 650 patients and 937 control individuals of German origin. Results LCE deletion frequency did not significantly differ between patients with PsA and controls (65.0% vs 65.5%). Similarly, no evidence for association to the three SNPs was observed. Discussion This is the first non-human leucocyte antigen (HLA) risk factor predisposing only to skin type of psoriasis, supporting the concept of partially overlapping but different aetiological factors underlying skin and joint manifestations.
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Affiliation(s)
- Ulrike Hüffmeier
- Institute of Human Genetics, University Hospital Erlangen, University of Erlangen-Nuremberg, 91054 Erlangen, Germany
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Linkage analysis of three genetic loci for disease susceptibility in Tunisian Psoriatic families. J Dermatol Sci 2009; 54:137-9. [DOI: 10.1016/j.jdermsci.2008.12.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2008] [Revised: 11/08/2008] [Accepted: 12/07/2008] [Indexed: 11/24/2022]
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Genome-wide association scan yields new insights into the immunopathogenesis of psoriasis. Genes Immun 2009; 10:201-9. [PMID: 19262574 DOI: 10.1038/gene.2009.11] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Psoriasis is a common, immunologically mediated, inflammatory and hyperproliferative disease of the skin and joints, with a multifactorial genetic basis. We earlier mapped PSORS1, the major psoriasis susceptibility gene in the major histocompatibility complex (MHC), to within or very near HLA-Cw6. In an effort to identify non-MHC psoriasis genes, we carried out a collaborative genome-wide association study. After the initial follow-up genotyping of 21 single nucleotide polymorphisms from 18 loci, showing strong evidence of association in the initial scan, we confirmed evidence of association at seven loci. Three of these loci confirm earlier reports of association (HLA-C, IL12B, IL23R) and four identify novel signals located near plausible candidate genes (IL23A, IL4/IL13, TNFAIP3 and TNIP1). In other work, we have also shown that interferon-gamma (IFN-gamma) treatment induces interleukin (IL)-23 mRNA and protein in antigen-presenting cells (APC), leading to the proliferation of CD4+ and CD8+ memory T cells expressing IL-17. Although functional variants remain to be identified, we speculate that genetic variants at the IL4/IL13 locus contribute to the Th1 bias that is characteristic of psoriasis, that Th1-derived IFN-gamma supports expansion of IL-17+ T cells through APC-derived IL-23 and that negative regulation of inflammatory signaling through the NF-kappaB axis is impaired because of genetic variants of TNFAIP3 and TNIP1.
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Kozhekbaeva ZM, Gra OA, Fadeev VS, Goldenkova-Pavlova IV, Korsunskaya IM, Bruskin SA, Agafonova EE, Piruzyan AL, Surzhikov SA, Nasedkina TV. Association of NAT2 polymorphisms with susceptibility to psoriasis in the Moscow population. Mol Biol 2009. [DOI: 10.1134/s0026893309010087] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kainu K, Kivinen K, Zucchelli M, Suomela S, Kere J, Inerot A, Baker BS, Powles AV, Fry L, Samuelsson L, Saarialho-Kere U. Association of psoriasis to PGLYRP and SPRR genes at PSORS4 locus on 1q shows heterogeneity between Finnish, Swedish and Irish families. Exp Dermatol 2009; 18:109-15. [DOI: 10.1111/j.1600-0625.2008.00769.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Deletion of the late cornified envelope LCE3B and LCE3C genes as a susceptibility factor for psoriasis. Nat Genet 2009; 41:211-5. [PMID: 19169253 DOI: 10.1038/ng.313] [Citation(s) in RCA: 387] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2008] [Accepted: 12/22/2008] [Indexed: 02/07/2023]
Abstract
Psoriasis is a common inflammatory skin disease with a prevalence of 2-3% in individuals of European ancestry. In a genome-wide search for copy number variants (CNV) using a sample pooling approach, we have identified a deletion comprising LCE3B and LCE3C, members of the late cornified envelope (LCE) gene cluster. The absence of LCE3B and LCE3C (LCE3C_LCE3B-del) is significantly associated (P = 1.38E-08) with risk of psoriasis in 2,831 samples from Spain, The Netherlands, Italy and the United States, and in a family-based study (P = 5.4E-04). LCE3C_LCE3B-del is tagged by rs4112788 (r(2) = 0.93), which is also strongly associated with psoriasis (P < 6.6E-09). LCE3C_LCE3B-del shows epistatic effects with the HLA-Cw6 allele on the development of psoriasis in Dutch samples and multiplicative effects in the other samples. LCE expression can be induced in normal epidermis by skin barrier disruption and is strongly expressed in psoriatic lesions, suggesting that compromised skin barrier function has a role in psoriasis susceptibility.
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Chen H, Toh TKL, Szeverenyi I, Ong RTH, Theng CTS, McLean WHI, Seielstad M, Lane EB. Association of skin barrier genes within the PSORS4 locus is enriched in Singaporean Chinese with early-onset psoriasis. J Invest Dermatol 2008; 129:606-14. [PMID: 18787534 DOI: 10.1038/jid.2008.273] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Psoriasis (OMIM#177900) is a common polygenic skin disorder affecting approximately 2% of the northern European population and 0.1% of the Han Chinese. Psoriasis patients suffer from chronic skin inflammation, manifested by erythematous scaly lesions. PSORS1-PSORS9 have been confirmed as psoriasis susceptibility loci in independent genetic studies on predominantly Caucasian populations, with psoriasis susceptibility loci (PSORS1, PSORS9) and additional loci at 9q33-34 and 2p22.3-11.2 reported in Han Chinese patients. In this study, we show the association of PSORS4 with psoriasis in Singaporean Chinese. Dense genotyping of single-nucleotide polymorphism-tagging candidate genes within the epidermal differentiation complex revealed significant association in the proximity of the involucrin gene (IVL); the strongest association was seen in early-onset psoriasis patients (P=0.0014). A follow-up genome-wide association screen localized the psoriasis susceptibility region to approximately 360 kb along chromosome 1 in the vicinity of IVL, small proline-rich region (SPRR) and proline-rich region 9 (PRR9) genes. The study of interactions between the causative variant(s) in this locus will provide insights into a possible role for epidermal barrier formation in the pathogenesis of psoriasis.
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Affiliation(s)
- Huijia Chen
- A*STAR Institute of Medical Biology, Singapore, Singapore
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Wang H, Kess D, Lindqvist AKB, Peters T, Sindrilaru A, Wlaschek M, Blakytny R, Holmdahl R, Scharffetter-Kochanek K. A 9-centimorgan interval of chromosome 10 controls the T cell-dependent psoriasiform skin disease and arthritis in a murine psoriasis model. THE JOURNAL OF IMMUNOLOGY 2008; 180:5520-9. [PMID: 18390736 DOI: 10.4049/jimmunol.180.8.5520] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Psoriasis is a complex genetic disease of unresolved pathogenesis with both heritable and environmental factors contributing to onset and severity. In addition to a disfiguring skin inflammation, approximately 10-40% of psoriasis patients suffer from destructive joint involvement. Previously, we reported that the CD18 hypomorphic PL/J mouse carrying a mutation resulting in reduced expression of the common chain of beta(2) integrins (CD11/CD18) spontaneously develops a skin disease that closely resembles human psoriasis. In contrast, the same mutation on C57BL/6J background did not demonstrate this phenotype. By a genome-wide linkage analysis, two major loci were identified as contributing to the development of psoriasiform dermatitis under the condition of low CD18 expression. Using a congenic approach, we now demonstrate that the introduction of a 9-centimorgan fragment of chromosome 10 derived from the PL/J strain into the disease-resistant CD18 hypomorphic C57BL/6J was promoting the development of psoriasiform skin disease and notably also arthritis. We therefore designated this locus psoriasiform skin disease-associated locus 1 (PSD1). High numbers of CD4(+) T cells and TNF-alpha producing macrophages were detected both in inflamed skin and joints in these congenic mice, with a complete resolution upon TNF-alpha inhibitor therapy or depletion of CD4(+) T cells. For the first time, we have identified a distinct genetic element that contributes to the T cell-dependent development of both psoriasiform skin disease and associated arthritis. This congenic model will be suitable to further investigations of genetic and molecular pathways that cause psoriasiform dermatitis and arthritis, and it may also be relevant for other autoimmune diseases.
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Affiliation(s)
- Honglin Wang
- Department of Dermatology and Allergic Diseases, University of Ulm, Ulm, Germany
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Genes and structure of selected cytokines involved in pathogenesis of psoriasis. Folia Histochem Cytobiol 2008; 46:11-21. [PMID: 18296259 DOI: 10.2478/v10042-008-0002-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Psoriasis is a common skin disease involving 1-4% of human population worldwide, of strong genetic background. The following cytokines are directly involved in psoriasis: TNF, IL-1, IL-2, IL-6, IL-7, IL-8, IL-15, IL-18, IL-19, IL-20, IL-23 whereas IL-4, IL-10, IL-12 as well as IL-11, IL-17 and IFN-gamma are rather indirectly engaged. This work is a review of some genetic factors and structure of selected cytokines and receptors and their genes location.
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Rodríguez E, Illig T, Weidinger S. Filaggrin loss-of-function mutations and association with allergic diseases. Pharmacogenomics 2008; 9:399-413. [DOI: 10.2217/14622416.9.4.399] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Human skin constitutes a highly organized barrier against environmental agents. Its unrestricted function depends on a complex interplay between multiple proteins and lipids expressed in the terminally differentiating epithelium. Recently, attention has been drawn to the protein filaggrin, an integral part of the epidermis that plays a key role in engineering and maintaining the barrier function. Common loss-of-function mutations within the filaggrin gene have been demonstrated to cause ichthyosis vulgaris, one of the most common heritable disorders of cornification, and to represent major risk factors for atopic eczema and secondary allergic diseases. The observations on filaggrin provide striking new insights into the etiology of atopic diseases and might pave the way for the development of new therapeutic approaches.
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Affiliation(s)
- Elke Rodríguez
- Division of Environmental Dermatology and Allergy, Helmholtz Zentrum Muenchen, Neuherberg and ZAUM-Center for Allergy and Environment, Technical University Munich, Biedersteiner Str. 29, 80802 Munich, Germany
| | - Thomas Illig
- Institute of Epidemiology, Helmholtz Zentrum Muenchen, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - Stephan Weidinger
- Department of Dermatology and Allergy, Technical University Munich, Biedersteiner Str. 29, 80802 Munich, Germany
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Saraceno R, Mannheimer R, Chimenti S. Regional distribution of psoriasis in Italy. J Eur Acad Dermatol Venereol 2008; 22:324-9. [DOI: 10.1111/j.1468-3083.2007.02423.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Besides the infiltrate of immune cells in psoriatic lesions, the principal characteristic changes in the skin are changes of the epidermal architecture and alterations of keratinocyte differentiation, which are distinct from other inflammatory skin diseases clinically and histologically. Several lines of evidence suggest that 3 of the 9 psoriasis susceptibility loci identified today might play a role in the keratinocyte differentiation program. Therefore, besides the dysregulation of the immune system, intrinsic epidermal components are also likely to play a role in triggering and/or sustaining the disease process and contribute to the chronicity of psoriasis and its frequent relapses.
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Affiliation(s)
- Erwin Tschachler
- Department of Dermatology, Medical University of Vienna, A-1090 Vienna, Austria.
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Abstract
For a complex genetic disease, psoriasis has a high penetration within families and a concordance rate of up to 70% in identical twins. Despite this and the endeavors of many research groups for more than a decade, no susceptibility allele has so far been unequivocally identified, although about 20 genetic loci associated with psoriasis have been reported from linkage-based studies. Moreover, only 1 of these linkage-based loci, PSORS1, that includes the HLA-C gene on chromosome 6p21, has been universally confirmed. Very recent data strongly indicate that HLA-Cw*0602 is the susceptibility allele in this locus, a finding that is consistent with the notion that the pathogenesis of psoriasis involves autoantigen recognition by epidermal CD8+ T lymphocytes. Several candidate genes in some of the other 7 PSORS designated loci are currently being evaluated. The relative lack of success in elucidating the genetic basis of psoriasis highlights the formidable challenge of dissecting the genetic basis of diseases with a complex mode of inheritance.
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Sun L, Yang S, Liu J, Ren Y, Fan X, Xu S, Zhou L, Yang C, Xiao F, Gao M, Cui Y, Du W, Huang W, Zhang X. Follow-up analysis of 180 Chinese Han families: identification of a novel locus for psoriasis at 2p22.3-11.2. Br J Dermatol 2008; 158:512-7. [DOI: 10.1111/j.1365-2133.2007.08417.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Chang YC, Wu WM, Chen CH, Hu CF, Hsu LA. Association between P478S polymorphism of the filaggrin gene and risk of psoriasis in a Chinese population in Taiwan. Arch Dermatol Res 2008; 300:133-7. [PMID: 18193244 DOI: 10.1007/s00403-007-0821-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2007] [Revised: 12/05/2007] [Accepted: 12/07/2007] [Indexed: 11/29/2022]
Abstract
Abnormal keratinocyte terminal differentiation is one of the important characteristics of psoriatic lesions. Filaggrin (FLG) is a key protein that facilitates the terminal differentiation of the epidermis. Thus, FLG genetic variants may modify the risk of psoriasis. In total, 314 patients with psoriasis and 611 control subjects were analyzed for the presence of FLG R501X, 2282del4 mutations, and P478S (rs11584340, C/T base change) polymorphism by polymerase chain reaction (PCR). The analysis revealed that both the R501X and 2282del4 mutations were not present in a subset of 200 patients (64%) with psoriasis. In contrast, a marginally significant difference (P = 0.020) was found in the distribution of rs11584340 genotype frequencies between psoriatic patients and controls. The frequency of the TT genotype in psoriasis patients was significantly higher than in controls (37.9% vs. 29.1%, respectively, P = 0.007). The T allele frequency of patients (60.5%) was also significantly higher than that of controls (53.9%) (P = 0.007). After adjusting for age and gender, carriers of the TT genotype were 1.46 (95% CI, 1.08-1.96) times more likely than non-carriers to have psoriasis (P = 0.013). In conclusion, our results suggest that FLG P478S polymorphism may confer susceptibility to the development of psoriasis among Taiwanese Chinese.
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Affiliation(s)
- Ya-Ching Chang
- Department of Dermatology, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taipei, Taiwan
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Zhang XJ, Yan KL, Wang ZM, Yang S, Zhang GL, Fan X, Xiao FL, Gao M, Cui Y, Wang PG, Sun LD, Zhang KY, Wang B, Wang DZ, Xu SJ, Huang W, Liu JJ. Polymorphisms in Interleukin-15 Gene on Chromosome 4q31.2 Are Associated with Psoriasis Vulgaris in Chinese Population. J Invest Dermatol 2007; 127:2544-51. [PMID: 17554368 DOI: 10.1038/sj.jid.5700896] [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: 01/04/2023]
Abstract
Through a series of linkage analyses in a large Chinese family cohort of psoriasis, we previously identified and confirmed a non-HLA psoriasis linkage locus PSORS9 within a small region at 4q31.2-32.1. Within the critical region of the PSORS9 locus, IL-15 has been long recognized as a strong candidate gene for psoriasis. In this study, we investigated the association between IL-15 genetic polymorphisms and psoriasis in a large Chinese sample. Highly significant evidence for association was identified at a single-nucleotide polymorphism (SNP) (g.96516A --> T) within the 3'-untranslated region (UTR) of the IL-15 gene (P=0.00006, after correction for multiple testing). Haplotype analysis using the SNPs within the 3'UTR region also provided strong supporting evidence for association (P=0.00005), where we identified a haplotype of the 3'UTR region of IL-15 associated with increased risk to psoriasis (odds ratio=1.65). This association was also supported by the results of our expression activity analyses, where we demonstrated that the identified risk haplotype is associated with an increased activity of IL-15. Therefore, we provided early evidence for the important role of IL-15 genetic variants in the pathogenesis of psoriasis, probably by increasing interleukin production and inflammation in the lesions of psoriasis.
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Affiliation(s)
- Xue-Jun Zhang
- Institute of Dermatology and Department of Dermatology at No.1 Hospital, Anhui Medical University, Hefei, China.
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