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S. Afr. med. j. (Online) ; 112(12): 904-910, 2022. tables
Article in English | AIM | ID: biblio-1411501


Background. Sarcoidosis is a multisystem granulomatous disorder. Its exact cause is unknown, but it is believed that an external agent may cause the characteristic immune reaction in genetically susceptible individuals. There is therefore general recognition that genetic vulnerability to sarcoidosis is one of the potential risk factors. HLA is encoded by genes in the major histocompatibility complex on chromosome 6. These surface cells are important in presentation of antigen and play a key part in the body's immune response to external antigens. Various HLA subtypes are more common in people with sarcoidosis than in those without. Variances in vulnerability, presentation, progression and prognosis have been related to different HLA phenotypes. HLA genes offer information into the factors driving sarcoidosis and prognosticating tools. However, in Africa, including South Africa (SA), there are no data on HLA types in relation to sarcoidosis.Objectives. To determine HLA class I and II associations in SA sarcoidosis patients.Methods. Phenotype frequencies of HLA-A, B and C and DQB1 and DRB1 were calculated for 51 consecutive patients with biopsy-proven sarcoidosis attending the respiratory clinic at Charlotte Maxeke Johannesburg Academic Hospital and 63 controls, who were potential organ donors. The frequencies of the tested HLA loci were determined by direct counting. The significance of the associations between the various loci tested for and the presence or absence of sarcoidosis was estimated from 2 × 2 tables using the χ2 test.Results. Of the 51 patients, 70.6% were female. The mean age was 44.6 years. Analysis of HLA class I and class II phenotypes in sarcoidosis patients revealed a significant association with HLA-B15, C4, C7, C12, C15, C16, C17, DQ3, DR8 and DR11. In addition, a significant negative (protective) association with HLA A9, A28, B12, B17 and DR2 was observed.Conclusion. This HLA study in SA patients suggests that genetic factors play a role in the causation of sarcoidosis. Some HLA subtypes have a significant association with sarcoidosis in SA patients, while other subtypes may be protective. The study supported the association of HLA antigens with sarcoidosis and implies that there is a genetic predisposition to sarcoidosis in the SA population.

Sarcoidosis , HLA-DQ Antigens , HLA-DR Antigens
Acta Academiae Medicinae Sinicae ; (6): 37-42, 2019.
Article in Chinese | WPRIM | ID: wpr-774001


Objective To analyze the levels of cytokines (IL-2,IFN-γ,IL-6,IL-10) associated with Th1 and Th2 cells in HLA-DQ8 transgenic mice model of ocular experimental autoimmune myasthenia gravis (oEAMG) induced by recombinant H-AChR γ subunit immunization.Methods DQ8 mice were immunized with 20 μg of AChR γ subunit,20 μg of crude E. coli extract (E. coli group),or complete Freund's adjuvant (CFA) only (CFA group). All mice were immunized on days 0,30,and 60. Mice were euthanized 28 days after the third immunization,and draining lymph node cells (LNC) and spleen lymphocytes were cultured in vitro. The supernatant was collected to observe the interleukin(IL)-2,interferon(IFN)-γ,IL-6,IL-10 production by ELISA.Results LNCs and spleen lymphocytes of H-AChR γ subunit-immunized mice exhibited significantly enhanced IFN-γ (F=76.332,P<0.001;F=34.865,P<0.001) and IL-2 (F=42.835,P<0.001;F=38.030,P<0.001),which associated with Th1 cells,as compared to E. coli group and CFA group. There were no significant differences in IL-6 (F=1.325,P=0.284;F=1.935,P=0.166) and IL-10 (F=0.908,P=0.417;F=1.189,P=0.322) levels,which secreted by Th2 cells,among these three groups.Conclusion Th1 cytokines play key roles in the pathogenesis of oEAMG,while the mechanism of Th2 cytokines for oEAMG remains unclear.

Animals , Mice , Cytokines , Escherichia coli , HLA-DQ Antigens , Interferon-gamma , Mice, Transgenic , Receptors, Cholinergic , Th1 Cells , Th2 Cells
Colomb. med ; 49(4): 273-279, Oct.-Dec. 2018. tab, graf
Article in English | LILACS | ID: biblio-984308


Abstract Introduction: Although the association between diabetes mellitus type 1 (T1DM) and celiac disease (CD) is well established; there are only a few studies that focus on South American children, haplotypes and their possible associations. Objective: To determine the prevalence of CD markers in a group of children with T1DM and to analyze the associated clinical, immunological and genetic manifestations. Methods: A prevalence study focusing on children with T1DM who were assessed based on variables including sociodemographics, anthropometric information, disease characteristics, laboratory results and family medical history. In partitipants a positive tTG2 (Ig A anti-transglutaminase), a duodenal biopsy and genotype were performed. The proportion of children with T1DM and CD was estimated (CI 95%). Determinations of central tendency, univariate and bivariate analysis, were also performed; p <0.05 was considered significant. Results: Thirteen (8.4%) of the 155 children (53.6% girls, 11.0 ±3.6 years, 2-18 years) with T1DM were tTG2 positive, four had CD (2.6%), seven had potential CD (4.5%) and nine were HLA DQ2/DQ8 positive (5.8%). Children with T1DM and CD had their last ketoacidotic episode (21.5 ±30.4 months versus 69.5 ±38.8 months, p= 0.0260) earlier than children with T1DM and potential CD. There were no differences with anthropometry or with the laboratory results regarding glycemic control. Conclusions: The prevalence of CD in these children with T1DM is higher than that reported in other South American countries. The prevalence of CD was found to be associated with the time of presentation of T1DM and its main allele, the DQ2/DQ8. These findings are different from what has been described in other places around the world.

Resumen Introducción: A pesar que la asociación entre diabetes mellitus tipo 1 (DMT1) y enfermedad celíaca (EC) está bien establecida; hay pocos estudios en niños suramericanos sobre haplotipos y sus posibles asociaciones. Objetivo: Determinar la prevalencia de marcadores de EC en un grupo de niños con DMT1, analizando las manifestaciones clínicas, inmunológicas y genéticas. Métodos: Estudio de prevalencia en niños con DMT1 a quienes se les tomaron variables sociodemográficas, antropométricas, de la enfermedad, paraclínicas y familiares metabólicas. A los niños con IgA anti-transglutaminasa (tTG2) positivos, se les realizó biopsia duodenal y genotipo. Se estimó la proporción de niños con DMT1 y EC y su IC 95%; medidas de tendencia central, análisis univariado y bivariado, siendo significativa una p <0.05. Resultados: Trece (8.4%) de los 155 niños (53.6% niñas, de 11.0 ±3.6 años, 2-18 años) con DMT1 fueron tTG2 positivos, cuatro presentaron EC (2.6%), siete EC potencial (4.5%) y nueve HLA DQ2/DQ8 (5.8%). Los niños con DMT1 y EC presentaron más pronto su último episodio cetoacidótico (21.5 ±30.4 meses versus 69.5 ±38.8 meses, p= 0.0260) que los niños con DMT1 y EC potencial. No hubo diferencias con la antropometría ni con los paraclínicos del control glicémico. Conclusiones: La prevalencia de EC en estos niños con DMT1 es superior a la de otros países suramericanos; estando asociada al tiempo de presentación de la DMT1 y su principal alelo el DQ2/DQ8, hallazgos diferentes a lo descrito a nivel mundial.

Adolescent , Child , Child, Preschool , Female , Humans , Male , HLA-DQ Antigens/genetics , Celiac Disease/epidemiology , Diabetes Mellitus, Type 1/complications , Time Factors , Biomarkers/metabolism , Celiac Disease/diagnosis , Celiac Disease/genetics , Prevalence , Diabetic Ketoacidosis/epidemiology , Colombia/epidemiology , Diabetes Mellitus, Type 1/genetics , Diabetes Mellitus, Type 1/epidemiology , Alleles , Genotype
Arq. gastroenterol ; 55(1): 82-85, Apr.-Mar. 2018. tab
Article in English | LILACS | ID: biblio-888230


ABSTRACT BACKGROUND: Celiac disease is an autoimmune enteropathy triggered by the ingestion of gluten in genetically susceptible individuals. Almost all celiac patients carry immune recognition genes coding for HLA-DQ2.5 and DQ8 heterodimers. Over the last few years, great importance has been given to HLA-DQ2.2 as probable predisposing variant, although controversies still exist regarding its relevance. OBJECTIVE: The aim of our study was to determine the possible existence of an association between HLA-DQ2.2 and celiac disease in Brazilian children by analyzing the prevalence of the predisposing variants for celiac disease in a representative group of children of a population in which this determination is still missing. METHODS: HLA-DQ typing was performed in samples from a group of celiac (n=100) and non-celiac children (n=110). All samples were tested for the presence of the following variants: DQA1*05-DQB1*02 (DQ2.5), DQA1*03-DQB1*03:02 (DQ8) and DQA1*02:01-DQB1*02:02 (DQ2.2). Fisher`s exact test was used for statistical analysis. RESULTS: In the group of 100 celiac children, 78 (78%) were positive for DQ2, 13 (13 %) were DQ2/DQ8 and 6 (6%) were DQ8 positives. The HLA-DQ pattern in the 110 non-celiac children was as follows: positive for DQ2 in 33 (29.9%) samples, in 2 (1.8 %) was positive for DQ2/DQ8 and in 15 (13.6%) was positive for DQ8. We found significant differences between the distribution of some but not all of the analyzed alleles when comparing celiac and non-celiac children. CONCLUSION: The genotyping of celiac disease HLA-DQ predisposing alleles showed similarities with HLA-DQ patterns found in both European and non-European populations, which may be a reflection of the miscegenation, which gave origin to the current Brazilian population. No significant association was found between DQ2.2 variant and celiac disease in the studied population.

RESUMO CONTEXTO: A doença celíaca é uma enteropatia autoimune, desencadeada pela ingestão do glúten em indivíduos geneticamente predispostos. Quase todos os pacientes celíacos possuem genes que codificam os heterodímeros HLA-DQ2.5 e DQ8. Nos últimos anos, mesmo com algumas controvérsias a respeito, tem se dado grande importância ao HLA-DQ2.2 como outra provável variante predisponente para doença celíaca. OBJETIVO: O objetivo do nosso trabalho foi determinar a provável associação entre HLA-DQ2.2 e a doença celíaca em crianças brasileiras, mediante a análise da prevalência das variantes predisponentes para doença celíaca em um grupo representativo desta população que ainda carece de dita informação. MÉTODOS: A genotipagem das variantes HLA-DQ foi realizada em populações de crianças celíacas (n=100) e não celíacas (n=110). A presença das seguintes variantes foi testada em todas as amostras: DQA1*05-DQB1*02 (DQ2.5), DQA1*03-DQB1*03:02 (DQ8) e DQA1*02:01-DQB1*02:02 (DQ2.2). A análise estatística foi realizada utilizando o teste exato de Fisher. RESULTADOS: No grupo de 100 crianças celíacas, 78 (78%) foram positivas para DQ2, 13 (13%) para DQ2/DQ8 e 6 (6%) foram DQ8 positivas. O padrão de variantes predisponentes no grupo de 110 crianças não celíacas foi: 33 (29.9%) amostras positivas para DQ2, 2 (1.8%) DQ2/DQ8 positivas e 15 (13.6%) DQ8 positivas. Quando as prevalências de ambos grupos foram compradas, foram achadas diferenças significativas entre algumas, mas não todas as variantes predisponentes. CONCLUSÃO: A genotipagem das variantes HLA-DQ predisponentes para doença celíaca mostrou um padrão similar ao achado em populações europeias e não-europeias, o qual pode ser resultado da miscigenação que deu origem à população brasileira atual. Nosso trabalho não mostrou associação significativa entre a variante DQ2.2 e a doença celíaca na população estudada.

Humans , Male , Female , Infant , Child, Preschool , Child , Adolescent , HLA-DQ Antigens/genetics , Celiac Disease/genetics , Genetic Predisposition to Disease , Genotype , Brazil , Case-Control Studies , Alleles
Govaresh. 2018; 22 (4): 256-260
in English | IMEMR | ID: emr-192475


Background: Studies have reported the controversial association between multiple sclerosis [MS] and celiac disease [CD]. Thus, we aimed to conduct a case control study on patients with MS, CD, and controls to investigate CD in patients with MS by means of comparing CD genetic markers in patients with MS and controls. We also evaluated serological markers in patients with MS

Materials and Methods: This is a case control study conducted on 60 patients with MS, 140 patients with CD, and 151 healthy controls in 2015 in Tehran, Iran. HLA typing was done to identify the carriers of the DQB1*02, DQB1*0301, DQA1*05, or DQA1*0201 alleles for HLA-DQ2, DQB1*0302, or DQA1*03 for HLA-DQ8. All data were analyzed using SPSS software [version 23, IBM Corp]. Serological markers including anti-gliadin antibodies [AGA] [IgA, IgG], anti-tissue trans glutaminase antibodies [Anti tTG] [IgA, IgG], anti-endomysial antibody [EMA] [IgA, IgG], and total IgA were assessed in MS group by enzyme immunoassays

Results: The data of 60 patients with MS [26.7% male, mean age = 34.83 years], 140 patients with CD [33.6% male, mean age = 38.37 years] and 151 controls [48.3% male, mean age = 40.43 years] were analyzed. The results of serological markers were not positive in any of the patients with MS. The prevalence of IgA deficiency [IgA

Conclusion: Our results did not show any correlation between MS and CD, which was similar to other studies

Humans , Male , Female , Child, Preschool , Child , Adolescent , Adult , Middle Aged , Aged , Celiac Disease/genetics , HLA-DQ Antigens , Genetic Markers , Case-Control Studies
Arq. Asma, Alerg. Imunol ; 1(1): 87-98, jan.mar.2017. ilus
Article in Portuguese | LILACS | ID: biblio-1380318


Objetivo: A identificação dos fenótipos da asma permite uma melhor compreensão e abordagem desta doença heterogênea. Muitos estudos têm demonstrado associação entre os antígenos leucocitários humanos (HLA) e asma em diversas populações, porém os resultados são inconclusivos e raramente consideram uma doença com diferentes fenótipos. O objetivo deste estudo foi caracterizar os fenótipos alérgico e não alérgico da asma e avaliar possíveis associações com o sistema HLA. Métodos: Um total de 190 pacientes com asma foram prospectivamente acompanhados durante dois anos. Foram divididos em dois grupos, asma alérgica e não alérgica, de acordo com a história clínica e os resultados do teste cutâneo de puntura e da pesquisa da IgE sérica específica. O grupo controle foi composto por 297 doadores falecidos de órgãos sólidos. As características de cada grupo e a tipificação dos HLA classe I e II foram avaliadas e comparadas. Resultados: O estudo mostrou diferentes características entre os fenótipos estudados. Os pacientes com asma não alérgica relataram uma idade mais tardia de início dos sintomas da doença e maior frequência de história sugestiva de intolerância aos anti-inflamatórios não esteroidais. O grupo asma alérgica apresentaram IgE sérica total elevada, presença de dermatite atópica e rinoconjuntivite mais frequente e, inesperadamente, maior gravidade da doença. Novas associações entre os genótipos HLA e os fenótipos alérgico e não alérgico da asma foram identificados. Os genótipos HLA-B*42, HLA-C*17, HLA-DPA1*03 e HLA-DPB1*105 foram associados com a asma alérgica, e o HLA-B*48 com o fenótipo não alérgico. A presença do haplótipo HLA-DPA1*03 DQA*05 foi associado com asma alérgica, e a presença do HLA-DPA1*03 e ausência do HLA-DQA*05 com a asma não alérgica. Conclusões: A asma alérgica e não alérgica apresentaram diferentes características fenotípicas e genotípicas. Novas associações entre os fenótipos e o sistema HLA classe I e II foram identificadas.

Objective: The identification of asthma phenotypes allows a better understanding and management of this heterogeneous disease. Studies have reported associations between human leukocyte antigens (HLA) and asthma in different populations, but results have been inconclusive and rarely take into consideration the distinct disease phenotypes. The objectives of this study were to characterize allergic and non-allergic asthma phenotypes and to evaluate possible associations with the HLA system. Methods: A total of 190 patients with asthma were prospectively followed during two years. They were divided into two groups, allergic and non-allergic asthma, according to clinical history and the results of skin prick testing and serum-specific IgE measurement. The control group comprised 297 deceased donors of solid organs. The characteristics of each group and HLA class I and II genotypes were assessed and compared. Results: The study revealed different characteristics between the phenotypes studied. Nonallergic patients were older at the onset of asthma symptoms and had a higher rate of history of intolerance to non-steroidal antiinflammatory drugs. Allergic patients showed higher total serum IgE levels, reported atopic dermatitis and rhinoconjunctivitis more frequently, and, unexpectedly, showed greater disease severity. New associations between HLA genotypes and the allergic/non-allergic asthma phenotypes were identified. HLA-B*42, HLA-C*17, HLADPA1* 03, and HLA-DPB1*105 genotypes were associated with allergic asthma, and HLA-B*48, with the non-allergic phenotype. The presence of haplotype HLA-DPA1*03 DQA*05 was associated with allergic asthma, and the presence of HLA-DPA1*03 and absence of HLA-DQA*05, with non-allergic asthma. Conclusion: Allergic and non-allergic asthma have distinct phenotypic and genotypic characteristics. New associations between asthma phenotypes and HLA class I and II were identified.

Humans , Male , Female , Adolescent , Adult , Middle Aged , Aged , History, 21st Century , Young Adult , Phenotype , Asthma , Immunoglobulin E , HLA-B Antigens , HLA-C Antigens , HLA-DP Antigens , HLA-DQ Antigens , Genotype , Tissue Donors , Severity of Illness Index , Control Groups
Arq. gastroenterol ; 53(4): 267-272, Oct.-Dec. 2016. tab, graf
Article in English | LILACS | ID: lil-794594


ABSTRACT Background Celiac disease is a permanent intolerance induced by gluten, which is expressed by T-cell mediated enteropathy, and has a high prevalence in the general population. There is evidence of a strong genetic predisposition to celiac disease. Objective To determine the prevalence of genetic markers HLA-DQ2 and HLA-DQ8 in blood donors from São Paulo and measure human recombinant tissue transglutaminase antibody IgA class in HLA-DQ2 and HLA-DQ8 positive donors. Methods A total of 404 blood donors from São Paulo city and Jundiaí were included in the study and signed the informed consent form. Information regarding diarrhea, constipation and abdominal pain in the last 3 months was collected. Determination of HLADQ2 and HLADQ8 alleles was performed in all participants and human recombinant tissue transglutaminase antibody class IgA was measured only in blood donors who presentedDQ2 and/or DQ8. Results HLADQ2 and/or HLADQ8 were positive in 49% (198/404) of subjects. Positive samples were associated with alleles DR3, DR4, DR7, DR11 and DR12. The most frequent genotype was DR4-DQ8, which was present in 13.6% of samples, followed by genotypes DR3-DQ2 and DR7-DQ2 with DQB1*02 in heterozygous, which were present in 10.4% and 8.7%, respectively. Eleven out of 198 positive donors (5%) were positive to human tissue transglutaminase test. Conclusion We observed a high prevalence of genetic markers for celiac disease, HLA-DQ2 and HLA-DQ8, in blood donors from São Paulo, similar to prevalence described in Europe. These findings show that the prevalence of celiac disease should not be rare in our country, but underdiagnosed.

RESUMO Contexto A doença celíaca é uma enteropatia imuno mediada causada pela intolerância permanente induzida pelo glúten, que se expressa por enteropatia mediada por linfócitos T, e possui uma alta prevalência na população geral. Há evidências de forte predisposição genética para doença celíaca. Objetivo Determinar a prevalência dos marcadores genéticos HLA-DQ2 e HLA-DQ8 em doadores de sangue da cidade de São Paulo e realizar rastreamento sorológico para doença celíaca com anticorpo antitransglutaminase tissular recombinante humana de classe IgA naqueles doadores de sangue com genotipagem HLA-DQ2 e HLA-DQ8 positivos. Métodos Estudo transversal prospectivo em que participaram 404 doadores de sangue, residentes na cidade de São Paulo e Jundiaí. A determinação dos alelos HLADQ2 e HLADQ8 foi realizada por PCR multiplex e alelo específico em todos os participantes do estudo e o anticorpo antitransglutaminase tissular recombinante humana de classe IgA e dosagem sérica de IgA foi realizada apenas nos doadores de sangue que possuíam DQ2 e/ou DQ8 positivo. Resultados O HLADQ2 e/ou DQ8 foi positivo em 49% (198/404) dos indivíduos, destes, 11 (5%) apresentaram anticorpo antitransglutaminase tissular humana positivo. Conclusão Podemos concluir que a prevalência dos marcadores genéticos para doença celíaca, HLA-DQ2 e DQ8 em São Paulo, mostrou-se elevada e similar à encontrada na Europa, assim como foi elevada a soroprevalênca para doença celíaca nos doadores de sangue com presença HLA-DQ2 e DQ8. Estes achados permitem afirmar que a prevalência da doença celíaca não deve ser rara em São Paulo, mas sim subdiagnosticada.

Blood Donors/statistics & numerical data , Celiac Disease/genetics , Autoantibodies/blood , Brazil/epidemiology , HLA-DQ Antigens , Genetic Markers , Celiac Disease/epidemiology , Transglutaminases , Prevalence , Cross-Sectional Studies , Prospective Studies , GTP-Binding Proteins , Genetic Predisposition to Disease , Genotype , Middle Aged
Gastroenterology and Hepatology from Bed to Bench. 2016; 9 (1): 18-24
in English | IMEMR | ID: emr-174978


Aim: The aim of this study was to evaluate the likelihood ratio and frequency of DQ2 and DQ8 in Iranian patients with celiac disease [CD]

Background: The HLA DQ2 and HLA DQ8 are the important mediators in the development of celiac disease. A few studies evaluated the frequency of HLA DQ2 and HLA DQ8 haplotypes among the Iranian population with low sample size

Patients and methods: In this cross-sectional study, to predict HLA-DQ2 and DQ8 haplotypes, 141[73 male, 78 female] confirmed CD patients compared to 151 healthy controls were enrolled into this study during 2013-2014. HLA DQ2/ DQ8 haplotypes was determined in cases and controls using PCR-SSP technique

Results: DQ2 and DQ8 were positive in 80% [n=111] and 49% [n= 69] of CD patients and 36% [n=61] and 13% [n=21] of control group respectively. Moreover, 32% [n=45] of CD patients and 5.3% [n=8] of the control group were carrier of both haplotypes. In the case group about one-third of patients [32.2%] were positive for carrying both DQ2 and DQ8 heterodimers while only 5.3% [n=8] of the control group were carrier. In addition, the positive likelihood ratio of DQ2 and DQ8 were 1.74 [CI: 1.4- 2.1], and 2.6 [CI: 1.8- 2.7], respectively

Conclusion: The result of this study showed that the frequency of DQ8 among our population is higher than those reported by European countries, but it is close to those founded in South America and Middle East. This result suggests that the higher prevalence of HLA DQ8 pattern in Iranian CD patients is similar to non-European patients

Adult , Humans , Female , Male , Likelihood Functions , HLA-DQ Antigens , Haplotypes , Cross-Sectional Studies , Patients
ABCD (São Paulo, Impr.) ; 28(3): 183-185, July-Sept. 2015. graf
Article in English | LILACS | ID: lil-762828


Background:Celiac disease is an enteropathy characterized by gluten sensitivity and broad clinical aspect. Has a multifactorial cause and depends on genetic, immunological and environmental factors for its development. The genetic influence is given mostly by the human leukocyte antigens HLA DQ2 and DQ8. Aim: To evaluate the prevalence of human leukocyte antigens DQ2 and DQ8 in three different groups: patients with celiac disease, first-degree relatives and the general population.Method:Retrospective analysis that evaluated serologic and endoscopic data of 74 patients with celiac disease and 109 non-celiac, which were subdivided into two subgroups: non-celiac who had first-degree relatives with celiac and non-celiac who did not. All patients underwent laboratory examination for screening genetic sensitivity given by HLA DQ2 and HLA DQ8 by.Results:The presence of HLA DQ2 and DQ8 was identified in 98,4% of 74 celiac patients, of which 79,7% had only HLA DQ2; 8,1% had only HLA DQ8 and 10,8% had both antigens histocompatibility. In the group of relatives of celiac patients, were included 29 patients; among them, 89,6% had HLA DQ2 and/or DQ8; 76% only the HLA DQ2, 10,3% only HLA DQ8 and 3,4% presented both human leukocyte antigens (HLA).Conclusion:HLA DQ2/DQ8 was present in 98,4% of celiac patients; 89,6% relatives of celiac family and in 55,4% of people from the general population without family celiac.

Racional:A doença celíaca é síndrome disabsortiva, autoimune, caracterizada pela sensibilidade ao glúten. Apresenta quadro clínico amplo e causa multifatorial, incluindo fatores genéticos, imunológicos e ambientais. O fator genético é dado, em sua maioria, pelo antígeno de histocompatibilidade HLA DQ2 e DQ8.Objetivo:Avaliar a prevalência do HLA DQ2 e DQ8 em três diferentes grupos: portadores de doença celíaca, em seus familiares de primeiro grau e na população geral.Método:Análise retrospectiva a partir de um banco de dados informatizado onde foram avaliados dados sorológicos de 74 pacientes portadores de doença celíaca e 109 não celíacos. Os não celíacos foram subdivididos em dois subgrupos: os que possuíam familiares de primeiro grau com doença celíaca e os que não. Todos foram submetidos à pesquisa de sensibilidade genética dada pelo HLA DQ2 e pelo HLA DQ8.Resultados:A presença do HLA DQ2 e DQ8 foi identificada em 98,4% dos 74 pacientes celíacos; destes, 79,7% apresentavam apenas HLA DQ2; 8,1% apenas HLA DQ8 e 10,8% os dois antígenos de histocompatibilidade. No grupo dos familiares de celíacos, foram avaliados 29 pacientes, dentre os quais 89,6% apresentavam o HLA DQ2 e/ou DQ8; destes, 76% apenas o HLA DQ2, 10,3% apenas o HLA DQ8 e 3,4% apresentou os dois antígenos de histocompatibilidade. Na população geral sem familiares celíacos, foram avaliados 80 pacientes; dentre eles, 53,7% apresentaram o antígeno, sendo 41,2% apenas o HLA DQ2, 11,3% apenas o HLA DQ8 e 1,2% tanto o HLA DQ2 quanto o HLA DQ8.Conclusão:O alelo HLA DQ2/DQ8 se fez presente em 98,4% dos pacientes celíacos; 89,6% dos familiares de celíacos; e em 55,4% das pessoas da população geral sem familiares celíacos.

Humans , Celiac Disease/blood , HLA-DQ Antigens/blood , Celiac Disease/genetics , HLA-DQ Antigens/genetics , Retrospective Studies
Arq. gastroenterol ; 52(2): 143-146, Apr-Jun/2015. tab, graf
Article in English | LILACS | ID: lil-748171


Background Celiac disease is an autoimmune enteropathy triggered by the ingestion of gluten in genetically susceptible individuals. Genetic susceptibility is associated with two sets of alleles, DQA1*05 - DQB1*02 and DQA1*03 - DQB1*03:02, which code for class II MHC DQ2 and DQ8 molecules, respectively. Approximately 90%-95% of celiac patients are HLA-DQ2 positive, and half of the remaining patients are HLA-DQ8 positive. In fact, during a celiac disease diagnostic workup, the absence of these specific DQA and DQB alleles has a near perfect negative predictive value. Objective Improve the detection of celiac disease predisposing alleles by combining the simplicity and sensitivity of real-time PCR (qPCR) and melting curve analysis with the specificity of sequence-specific primers (SSP). Methods Amplifications of sequence-specific primers for DQA1*05 (DQ2), DQB1*02 (DQ2), and DQA1*03 (DQ8) were performed by the real time PCR method to determine the presence of each allele in independent reactions. Primers for Human Growth Hormone were used as an internal control. A parallel PCR-SSP protocol was used as a reference method to validate our results. Results Both techniques yielded equal results. From a total of 329 samples the presence of HLA predisposing alleles was determined in 187 (56.8%). One hundred fourteen samples (61%) were positive for a single allele, 68 (36.3%) for two alleles, and only 5 (2.7%) for three alleles. Conclusion Results obtained by qPCR technique were highly reliable with no discordant results when compared with those obtained using PCR-SSP. .

Contexto Doença celíaca é uma enteropatia autoimmune desencadeada pela ingestão de gluten em indivíduos geneticamente suscetíveis. Essa suscetibilidade genética está associada a dois conjuntos de alelos, DQA1*05 - DQB1*02 e DQA1*03 - DQB1*03:02, que codificam moléculas MHC de classe II DQ2 e DQ8, respectivamente. Aproximadamente 90%-95% dos pacientes celíacos são HLA-DQ2 positivos, e metade dos restantes são HLA-DQ8 positivos. No diagnóstico da doença celíaca, a ausência desses alelos DQA e DQB específicos possui um elevado valor preditivo negativo. Objetivo Nosso objetivo foi melhorar a detecção de alguns alelos predisponentes para doença celíaca, combinando a simplicidade e sensibilidade da técnica de PCR em tempo real (qPCR) e análise da curva de melting com a especificidade dos primers de sequência específica. Métodos Primers de sequência específica para DQA1*05 (DQ2), DQB1*02 (DQ2), e DQA1*03 (DQ8) foram usados para testar a presença de cada alelo em reações independentes. Primers para Hormônio de Crescimento Humano foram usados como controle interno. Em paralelo, foi usado um protocolo de PCR-SSP como um método de referência para validar nossos resultados positivos. Resultados Das 329 amostras testadas, 187 (56.8%) foram positivas para os alelos HLA predisponentes, usando as duas técnicas. Essas 187 amostras positivas foram subdivididas em 114 (61.0%) positivas para apenas um alelo, 68 (36.3%) para dois alelos e apenas 5 (2.7%) para os três alelos. Conclusão Os resultados obtidos pela técnica de qPCR mostraram-se altamente confiáveis, sem resultados discordantes quando comparados àqueles obtidos pelo método PCR-SSP. .

Humans , Alleles , Celiac Disease/genetics , Genetic Predisposition to Disease/genetics , HLA-DQ Antigens/genetics , Celiac Disease/diagnosis , Genotype , Predictive Value of Tests , Real-Time Polymerase Chain Reaction , Sensitivity and Specificity
Arq. gastroenterol ; 52(1): 55-58, Jan-Mar/2015. tab, graf
Article in English | LILACS | ID: lil-746474


Background Familial Mediterranean Fever and celiac disease are both related to auto-inflammation and/or auto-immunity and they share some common clinical features such as abdominal pain, diarrhea, bloating and flatulence. Objectives We aimed to determine the association of these two diseases, if present. Methods Totally 112 patients diagnosed with Familial Mediterranean Fever and 32 cases as healthy control were included in the study. All participants were examined for the evidence of celiac disease, with serum tissue transglutaminase IgA levels (tTG IgA). Results Totally 144 cases, 112 with Familial Mediterranean Fever and 32 healthy control cases were included in the study. tTG IgA positivity was determined in three cases with Familial Mediterranean Fever and in one case in control group. In that aspect there was no significant difference regarding the tTG IgA positivity between groups (P=0.81). Duodenum biopsy was performed to the tTG IgA positive cases and revealed Marsh Type 3b in two Familial Mediterranean Fever cases and Marsh Type 3c in the other one while the biopsy results were of the only tTG IgA positive case in control group was Marsh Type 3b. In HLA evaluation of the celiac cases; HLA DQ2 was present in two celiac cases of the Familial Mediterranean Fever group and in the only celiac case of the control group while HLA DQ8 was present in one celiac case of the Familial Mediterranean Fever group. Conclusions We did not determine an association of Familial Mediterranean Fever with celiac disease. Larger studies with subgroup analysis are warranted to determine the relationship of these two diseases. .

Contexto A Febre Familiar do Mediterrâneo e a doença celíaca são ambas relacionadas com auto-inflamação e/ou auto-imunidade e partilham algumas características clínicas comuns tais como dor abdominal, diarréia, distensão abdominal e flatulência. Objetivo Determinar a associação destas duas doenças, se presente. Métodos Um total de 112 pacientes diagnosticados com Febre Familiar do Mediterrâneo e 32 casos como controle saudável foram incluídos no estudo. Todos os participantes foram examinados para a evidência da doença celíaca, com níveis de IgA séricos transglutaminase (tTG IgA). Resultados Um total de 144 casos, 112 com Febre Familiar do Mediterrâneo e 32 casos controle saudável foram incluídos no estudo. A positividade tTG IgA foi determinada em três casos com Febre Familiar do Mediterrâneo e em um caso no grupo controle. Neste aspecto não há nenhuma diferença significativa em relação a positividade tTG IgA entre os grupos (P= 0,81). Biópsia de duodeno realizado para os casos positivos de tTG IgA e revelou Marsh tipo 3b em dois casos de Febre Familiar e Marsh tipo 3C no outro, enquanto o resultado da biópsia do único caso positivo tTG IgA no grupo controle foi Marsh tipo 3b. Na avaliação de HLA dos casos de doença celíaca, HLA DQ2 esteve presente em dois casos de doença celíacas do grupo Febre Familiar do Mediterrâneo e no caso celíaco do grupo controle, enquanto HLA-DQ8 estava presente em um caso de doença celíaca do grupo Febre Familiar do Mediterrâneo. Conclusão Não se determinou uma associação de Febre Familiar do Mediterrâneo com doença celíaca. Maiores estudos com análise de subgrupo são necessários para determinar a relação entre estas duas doenças. .

Child, Preschool , Female , Humans , Male , Celiac Disease/complications , Familial Mediterranean Fever/complications , Autoantibodies/blood , Biopsy , Case-Control Studies , Cross-Sectional Studies , Celiac Disease/diagnosis , Celiac Disease/epidemiology , Familial Mediterranean Fever/epidemiology , Familial Mediterranean Fever/genetics , HLA-DQ Antigens/blood , Immunoglobulin A/blood , Prevalence , Transglutaminases/blood
Arq. gastroenterol ; 51(2): 151-154, Apr-Jun/2014. tab, graf
Article in English | LILACS | ID: lil-713586


Context It is well recognized that celiac disease is an immune-mediated systemic disorder highly prevalent among relatives of celiac patients. Objectives The aim of this study is to determine the prevalence of celiac disease in a group of first degree relatives of celiac children, and to access the frequency of human leukocyte antigen HLA-DQ2 and DQ8 in celiac disease patients and their affected relatives. Methods A survey was conducted of 39 children with celiac disease with follow-up in the Pediatric outpatient’s clinic of Dr. Nélio Mendonça Hospital, in Madeira Island, Portugal. Were invited 110 first degree relatives to undergo serological screen for celiac disease with IgA antibody to human recombinant tissue transglutaminase (IgA-TGG) quantification. In all seropositive relatives, small intestinal biopsy and HLA typing was recommended. Results HLA- typing was performed in 38 celiac patients, 28/74% DQ2 positive, 1/2% DQ8 positive and 9/24% incomplete DQ2. Positive IgA-TGG was found in five out of the 95 relatives, and CD was diagnosed in three of them. Three relatives had the presence of HLA-DQ2, two were DQ2 incomplete (DQB1*02). Conclusions The prevalence of celiac disease among first degree celiac patients´ relatives was 3.1%, 4.5 times higher than the general Portuguese population (0,7%) witch reinforces the need of extensive diagnostic screening in this specific group. HLA-DQ2 typing may be a tool in the diagnostic approach. .

Contexto A doença celíaca é uma doença sistémica autoimune muito prevalente nos familiares de primeiro grau de doentes celíacos. Objetivos O objetivo deste estudo é determinar a prevalência de doença celíaca, num grupo de familiares de primeiro grau de crianças com o diagnóstico de doença celíaca e, determinar a frequência de antígeno leucocitário humano (HLA)-DQ2 e DQ8 nos doentes celíacos e seus familiares afetados. Métodos Foi feita a pesquisa dos processos clínicos de 39 crianças com o diagnóstico de doença celíaca seguidas na consulta de Gastroenterologia Pediátrica do Hospital Dr. Nélio Mendonça na Ilha da Madeira, Portugal. Foram convidados 110 familiares de primeiro grau para a realização do rastreio serológico de doença celíaca através da quantificação do anticorpo IgA anti-transglutaminase tecidular humano (IgA-TGG). Aos familiares com resultado positivo no rastreio, foi recomendada a realização de biópsia intestinal e tipificação HLA. Resultados A tipificação HLA foi realizada em 38 crianças. Verificou-se a presença do heterodímero DQ2 em 28/74%, DQ8 em 1/2% e DQ2 incompleto em 9/24% das crianças. O rastreio de DC com IgA-TGG foi positivo em cinco dos 95 familiares analisados, tendo sido diagnosticada doença celíaca em três destes. Verificou-se a presença do heterodímero HLA-DQ2 em três familiares e HLA-DQ2 incompleto (DQB1*02) em dois familiares. Conclusões A prevalência de doença celíaca em familiares de primeiro grau de doentes celíacos foi 3.1%, 4.5 vezes mais elevada do que a da população Portuguesa geral (0,7%), o que reforça a importância de alargar o rastreio a este grupo específico. A tipificação ...

Adolescent , Adult , Child , Child, Preschool , Female , Humans , Infant , Male , Middle Aged , Young Adult , Autoantibodies/blood , Celiac Disease/epidemiology , Family , GTP-Binding Proteins/blood , HLA-DQ Antigens/blood , Transglutaminases/blood , Celiac Disease/diagnosis , Celiac Disease/genetics , Genetic Predisposition to Disease , Luminescent Measurements , Mass Screening , Prevalence , Portugal/epidemiology
Acta gastroenterol. latinoam ; 44(1): 16-21, 2014 Mar.
Article in Spanish | LILACS, BINACIS | ID: biblio-1157429


BACKGROUND: There is a strong association between celiac disease (CD) and certain genes of the major histocompatibility complex (HLA). The CD specifically related alleles are those coding for HLA-DQ2 heterodimer and to a lesser degree for HLA-DQ8. OBJECTVE. The aim of this study was to evaluate the frequency of HLA-DQB1* and HLA-DRB1* alleles, haplotypes, and genotypes in patients diagnosed with CD and in control population of Chaco, in order to establish its distribution and compare it with that observed in other populations. METHODS: A total of 139 samples from patients diagnosed with CD and 119 healthy controls were typed for HLA-DQ and HLA-DR, using PCR and reverse hybridization (INNO-LiPA or Dynal). RESULTS: Comparing patients with CD vs. controls, the DQBI*0201 (P = 0.0002), DQBJ*0202 (P = 0.0046), DQBI*0302 (P = 0. 0006), DRBl *03 (P = 0.0002), DRBl *04 (P = 0.0199) and DRB1 *07 (P = 0.0062) were significantly increased, while a decrease was observed in HLA-DQB1*0301 (P = 0.0006), HLA-DQBI*0303 (P = 0.0070), DQBI*0501 (P = 0.0023), DQB1*0604 (P = 0.0140) DRB1*01 (P = 0.0023), DRB1*08 (P = 0.0165), DRB1*09 (P = 0.0362) and DRB1*16 (P = 0.0228). Within DQB1* genotypes associated with EC, 65.4

of patients had the DQB1*02 in linkage disequilibrium with DRB1*03 or DRB1*07 (DQ2), and 43.2

presented genotype DQB1*0302 in linkage disequilibrium with DRB1*04 (DQ8). Both genotypes were shared by 15.2

of them. CONCLUSIONS: We point out the high frequency of DQ8 associated with CD. Although the DQ2 is still the most common, this finding could be attributed to the Amerindian influence in our population.

HLA-DQ Antigens/genetics , HLA-DRB1 Chains/genetics , Celiac Disease/genetics , Genetic Predisposition to Disease/genetics , Adolescent , Adult , Young Adult , Argentina , Case-Control Studies , Female , Gene Frequency , Genotype , Haplotypes , Humans , Aged , Male , Middle Aged
Govaresh. 2014; 18 (4): 242-245
in English | IMEMR | ID: emr-142006


Recent studies have shown a critical role for HLA-DQ2 and HLA-DQ8 in the pathogenesis of celiac disease. No study has been performed on the prevalence of these two HLA types in Iranian celiac patients. We enrolled 24 celiac patients and 37 first-degree relatives in whom the diagnosis of celiac was excluded by sero-logic tests. HLA typing for HLA-DQ2 [DQB1*02], HLA-DQ8 [DQB1*03], HLA-DQ B1*05 and HLA-DQ B1*06 was performed using polymerase chain [PCR] reaction. Twenty two [91.7%] celiac patients and twenty seven [73%] controls were positive for the HLA-DQ2 and/or HLA-DQ8 heterodimers. There was no significant difference between the two groups p=0.068]. However, celiac patients were statistically more positive for homozygote HLA-DQ2, whereas non-celiac participants were more positive for homozygote HLA-DQ8 [p<0.05]. The total prevalence of HLA-DQ2 and/or HLA-DQ8 allels did not significantly differ between the two groups. Hence, first-degree relatives of celiac patients appear to be more susceptible for developing celiac disease. On the other hand, the higher prevalence of homozygote HLA-DQ2 in celiac patients shows its stronger role in disease pathogenesis. Further studies on larger populations are needed in Iran.

Humans , HLA-DQ Antigens , Genotyping Techniques , HLA Antigens , Polymerase Chain Reaction
Chinese Journal of Medical Genetics ; (6): 765-769, 2014.
Article in Chinese | WPRIM | ID: wpr-291685


<p><b>OBJECTIVE</b>To investigate the association of single nucleotide polymorphisms in the HLA-DP and DQ genes with the outcome of chronic hepatitis B virus infection.</p><p><b>METHODS</b>Two hundred and four healthy subjects, 255 clearance subjects, 204 asymptomatic HBV carriers (AsC), 136 chronic hepatitis B (CHB), 68 liver cirrhosis (LC) and hepatocellular carcinoma (HCC) were enrolled. Genotypes of rs3077, rs9277535 and rs2647050 were determined by sequence specific primers-PCR (PCR-SSP).</p><p><b>RESULTS</b>By using healthy subjects and clearance subjects as the control groups, rs3077 and rs9277535 were significantly associated with chronic HBV infection under additive and dominant models (P< 0.05). Meanwhile, haplotypes GGA, AGA, AAA appeared to be protective factors against chronic HBV infection (P < 0.05). By using AsC as the control group, comparison with the CHB, LC and HCC groups showed no association of the 3 SNPs or haplotypes with the clinical outcome (P > 0.05).</p><p><b>CONCLUSION</b>HLA-DP gene polymorphisms are strongly associated with chronic HBV infection. The presence of A allele at rs3077 and rs9277535 of the HLA-DP gene may decreased the risk for chronic HBV infection.</p>

Adult , Female , Humans , Male , Middle Aged , Asian People , Ethnology , Genetics , Case-Control Studies , China , Ethnology , Genotype , HLA-DP Antigens , Genetics , HLA-DQ Antigens , Genetics , Hepatitis B virus , Physiology , Hepatitis B, Chronic , Ethnology , Genetics , Virology , Polymorphism, Single Nucleotide
Damascus University Journal for Health Sciences. 2012; 28 (1): 243-261
in Arabic | IMEMR | ID: emr-132807


Many available references indicate to a role for HLA-antigens in recurrent abortions, during their function in self and non-self recognition. The embryo, being hemi-allograft, make it rational to search for some HLA-antigens more frequent in women suffering from recurrent abortions in Syrian population, especially HLA-II antigens HLA-II antigens. Searching also for combined haplotypes between these antigens. We did not found any like study in Syrian population. The Antigens types of HLA-DR and HLA-DQ of [14] fertile multifarious Syrian couples[controls] were defined by micro lymphocytotoxicity test[Terazaki method]. In the same time, antigen types of DR and DQ of [36] Healthy Syrian couples suffering from recurrent abortions were defined by the same technique. The results indicate different antigen pattern distribution between control and diseased groups. The frequencies in control group for DR types were as the following: DR4:29%, DR11:18%, DR15:14%, DR1: 7%, DR7: 7%, DR8: 7%, DR16: 7%, DR3: 4%, DR12: 4%, DR14: 4%. And in the diseased group were: DR4:18%, DR11:18%, DR7: 11%, DR1: 10%, DR14: 7%, DR17: 7%, DR13: 6%, DR15: 6%, DR8: 6%, DR3: 4%, DR12: 3%, DR9: 1%, DR10: 1%, DR16: 1%, DR18: 1%. The frequencies in control group for DQ types were: DQ3: 29%, DQ4: 25%, DQ5: 21% DQ2: 14%, DQ6: 11%. And in the diseased group were: DQ3: 28%, DQ5: 25%, DQ2: 18%, DQ4: 15%, DQ6: 14%. The obvious frequency changes for DR types were: DR1, DR7, DR4, D15, DR13, DR17, DR14 and for DQ types were: DQ2, DQ4, DQ5, DQ6. The differences of DR -DQ types distributions in the studied group of control [women and men] are similar to those in other studies in the Syrian population. This study suggest that having antigen types of DR-DQ in frequencies different from control observed in the whole population make them at risk to inconvenient immunological response to accept pregnancy the result of which is abortion.

Humans , Female , Male , Adult , Middle Aged , HLA-DQ Antigens , HLA-DR Antigens , Abortion, Habitual , Genome-Wide Association Study , Case-Control Studies
Annals of Laboratory Medicine ; : 57-65, 2012.
Article in English | WPRIM | ID: wpr-43985


BACKGROUND: Narcolepsy is a neurologic disorder characterized by excessive daytime sleepiness, symptoms of abnormal rapid eye movement (REM) sleep, and a strong association with HLA-DRB1*1501, -DQA1*0102, and -DQB1*0602. Here, we investigated the clinico-physical characteristics of Korean patients with narcolepsy, their HLA types, and the clinical utility of high-resolution PCR with sequence-specific primers (PCR-SSP) as a simple typing method for identifying DRB1*15/16, DQA1, and DQB1 alleles. METHODS: The study population consisted of 67 consecutively enrolled patients having unexplained daytime sleepiness and diagnosed narcolepsy based on clinical and neurological findings. Clinical data and the results of the multiple sleep latency test and polysomnography were reviewed, and HLA typing was performed using both high-resolution PCR-SSP and sequence-based typing (SBT). RESULTS: The 44 narcolepsy patients with cataplexy displayed significantly higher frequencies of DRB1*1501 (Pc= 0.003), DQA1*0102 (Pc=0.001), and DQB1*0602 (Pc=0.014) than the patients without cataplexy. Among patients carrying DRB1*1501-DQB1*0602 or DQA1*0102, the frequencies of a mean REM sleep latency of less than 20 min in nocturnal polysomnography and clinical findings, including sleep paralysis and hypnagogic hallucination were significantly higher. SBT and PCR-SSP showed 100% concordance for high-resolution typing of DRB1*15/16 alleles and DQA1 and DQB1 loci. CONCLUSIONS: The clinical characteristics and somnographic findings of narcolepsy patients were associated with specific HLA alleles, including DRB1*1501, DQA1*0102, and DQB1*0602. Application of high-resolution PCR-SSP, a reliable and simple method, for both allele- and locus-specific HLA typing of DRB1*15/16, DQA1, and DQB1 would be useful for characterizing clinical status among subjects with narcolepsy.

Adolescent , Adult , Aged , Female , Humans , Male , Middle Aged , Alleles , Cataplexy/genetics , DNA Probes, HLA , Gene Frequency , Genetic Predisposition to Disease , Genotype , HLA-DQ Antigens/genetics , HLA-DRB1 Chains/genetics , Histocompatibility Testing , Narcolepsy/diagnosis , Phenotype , Polymerase Chain Reaction
Annals of Laboratory Medicine ; : 139-144, 2012.
Article in English | WPRIM | ID: wpr-100685


BACKGROUND: We evaluated the clinical relevance of pretransplant donor-specific HLA antibodies (DSA) in renal transplantation patients who had negative T-cell cytotoxicity crossmatches. METHODS: From 328 consecutive renal transplant recipients, we selected 28 patients who had positive pretransplant (historical or at the time of transplantation) flow cytometry crossmatches, but negative T-cell cytotoxicity crossmatches at the time of transplantation. The presence of DSA and its level at the time of transplantation were retrospectively tested using Luminex single antigen assays. RESULTS: DSA was present in 16 (57.1%) of 28 patients. Biopsy-proven acute rejection (9 patients) occurred more frequently in patients with DSA than in those without DSA (56.3% vs. 0.0%; P=0.003). The positivity rate of class II DSA was significantly higher in patients with antibody-mediated rejection (AMR) than in those without AMR (100% vs. 21.7%; P=0.003). However, the positivity rate of class I DSA was not different between the two groups (40% vs. 40.9%). Among patients with class II DSA, those with AMR tended to have higher antibody levels (median fluorescence intensity, MFI) than those without AMR (16,359 vs. 5,910; P=0.056). A cut-off MFI value of 4,487 for class II DSA predicted the occurrence of AMR with good sensitivity and specificity (100% and 87.0%). CONCLUSIONS: In patients with negative T-cell cytotoxicity crossmatches, the presence of class II DSA and its level at the time of transplantation were associated with the occurrence of AMR. Pretransplant DSA measurement with Luminex single antigen assay would be useful in renal transplantation.

Adolescent , Adult , Aged , Female , Humans , Male , Middle Aged , Young Adult , Antibodies/immunology , Graft Rejection/immunology , HLA-DQ Antigens/immunology , HLA-DR Antigens/immunology , Histocompatibility Testing , Kidney Transplantation/immunology , T-Lymphocytes, Cytotoxic/immunology , Tissue Donors
Journal of Experimental Hematology ; (6): 1463-1468, 2012.
Article in Chinese | WPRIM | ID: wpr-325238


This study was aimed to investigate the distribution feature of HLA-DR/DQ gene linkage disequilibrium in Chinese Han population and to improve the accuracy of HLA matching results. Genotyping of HLA-DR and HLA-DQ gene locus was performed using PCR-SSP typing in Chinese Han population receiving kidney transplantation. The results showed that there were 29 new linkage combinations in 1799 patients, in which DR13-DQ5, DR11-DQ8 and DR8-DQ8 were discovered for 11, 8 and 7 times respectively while DR9-DQ8, DR12-DQ6 and DR14-DQ4 were both discovered for 6 times. The linkage disequilibrium parameters of these haplotypes were negative, showing that these linkages were uncommon. It is concluded that this study not only enriches the classical HLA-DR/DQ linkage combinations, but also indicates the national relevance of combination distribution, and it has great importance in improving the accuracy of HLA matching experiments and reducing unnecessary repeated work.

Adult , Humans , Asian People , Genetics , Gene Frequency , Genotype , HLA-DQ Antigens , Genetics , HLA-DR Antigens , Genetics , Haplotypes , Kidney Transplantation , Linkage Disequilibrium
Clinics ; 66(2): 227-231, 2011. tab
Article in English | LILACS | ID: lil-581506


AIMS: The aim of this study was to evaluate the frequencies of the HLA genotypes DQ2 and DQ8 and the alleles A1*05, A1*0201, B1*0201 and B1*0302 in individuals with celiac disease in Recife, northeastern Brazil. METHODS: HLA DQ2 and DQ8 genotyping was performed for 73 individuals with celiac disease and 126 first-degree relatives with negative transglutaminase serology. The alleles DQA1*05, DQA1*0201, DQB1*02 and DQB1*0302 were identified by sequencing using specific primers and the EU-DQ kit from the Eurospital Laboratory, Trieste, Italy and double-checked by the All Set SPP kit (Dynal). RESULTS: Among the 73 cases, 50 (68.5 percent) had the genotype DQ2, 13 (17.8 percent) had DQ8, 5 (6.8 percent) had DQ2 and DQ8, and 5 did not have any of these genotypes. Among the 5 negative individuals, four had the B1*02 allele and one did not have any of the alleles studied. B1*02 was the most frequent allele in both groups (94 percent in the patients and 89 percent in the control relatives). CONCLUSIONS: In this study, celiac disease was associated with the genotypes DQ2 and DQ8. DQ2 predominated, but the distribution of the frequencies was different from what has been found in European populations and was closer to what has been found in the Americas. The high frequencies of the HLA genotypes DQ2 and DQ8 that were found in first-degree relatives would make it difficult to use these HLA genotypes for routine diagnosis of celiac disease in this group.

Adolescent , Adult , Child , Child, Preschool , Female , Humans , Infant , Male , Middle Aged , Young Adult , Celiac Disease/genetics , Family , Gene Frequency/genetics , Genetic Predisposition to Disease/genetics , HLA-DQ Antigens/genetics , Brazil/epidemiology , Chi-Square Distribution , Cross-Sectional Studies , Europe/epidemiology , Genetic Predisposition to Disease/epidemiology