Toll-like receptor gene polymorphisms in patients with myeloproliferative neoplasms.

Toll-like receptors (TLRs) are a family of transmembrane receptors whose signaling control cellular processes of cell proliferation, survival, apoptosis, angiogenesis, remodeling, and repair of tissues. Polymorphisms in TLR genes can change the balance between pro and anti-inflammatory cytokines, modulating the risk of infection, chronic inflammation, and cancer. Although many studies have demonstrated the direct involvement of TLR signaling in the benefit of tumor cells in certain cancers, little is known about the influence of these gene polymorphisms on myeloproliferative neoplasms (MPNs). In this context, the objective of the study was to investigate a possible association between the TLR polymorphisms and the development of MPNs. 167 patients diagnosed with MPN and 222 healthy controls from the same region were evaluated. Genomic DNA was extracted and the TLR2 (rs5743708), TLR4 (rs4986790, rs4986791), TLR9 (rs5743836, rs187084) and JAK2V617F polymorphisms were genotyped by PCR-RFLP. The statistical analysis was performed by OpenEpi and SNPstat software. The JAK2V617F mutation was found in 68.32% of patients. TLR9-1486C/T CT genotype was less frequent in patients with polycythemia vera (PV) (OR 0.39, 95% CI 0.20-0.78, P = 0.025). When haplotype frequencies were analyzed, -1237T/-1486C (TLR9) was also less frequent in men (OR 0.58, 95% CI 0.36-0.94) and JAK negative men patients (OR 0.43, 95% CI 0.21-0.88). We can infer that the TLR9-1486 CT genotype could be associated with protection for PV and the TLR9-1237T/-1486C haplotype, protection for men, as well as for JAK negative men patients with MPN. There were no associations between TLR2 and TLR4 gene polymorphisms and MPN.

IL8 and IL17A polymorphisms associated with multibacillary leprosy and reaction type 1 in a mixed population from southern Brazil.

We evaluated the influence of the IL8 T-738A (nonidentified rs), IL8 T-353A (rs4073), IL17A G197A (rs2275913), and IL17F T7488C (rs763780) single-nucleotide polymorphisms on leprosy. The AA genotype of IL8 T-353A was observed as a risk factor for multibacillary leprosy, regardless of gender and age-of-onset of disease, considering the recessive model (OR, 3.8; 95% CI, 1.1-13.5; P, 0.023). Furthermore, the AA genotype of IL17A G197A was associated with leprosy type 1 reaction (OR, 2.4; 95% CI, 1.1-5.1; P, 0.026) when compared to the group without reaction, which was adjusted for gender and age-of-onset of disease by the model log additive. These results indicate association of IL8 and IL17A polymorphisms with the progression to multibacillary leprosy and with the type 1 reaction, respectively.

Association of TNF polymorphisms with JAK2 (V617F) myeloproliferative neoplasms in Brazilian patients.

The classical chromosome Philadelphia-negative myeloproliferative neoplasms (MPNs) are a group of disorders that share clinical, hematological, and histological features. Proinflammatory cytokines such as tumor necrosis factor-α (TNF-α) are elevated in patients with MPN. The aim of this study was to verify the association between the polymorphisms of TNF gene (-308G/A and -238 G/A) in BCR-ABL-negative MPN in our population. Blood samples obtained from MPN patients were genotyped for the JAK2V617F mutation and both TNF polymorphisms using PCR-RFLP. Thirty three (26.8%) patients with polycythemia vera (PV), 35 (28.7%) essential thrombocythemia (ET), 22 (17.7%) primary myelofibrosis (PMF), and 33 (26.8%) with unclassifiable MPN (MPNu) were included in the study. The JAK2 V617F mutation was detected in 94 (76.42%) patients. Were observed a significant increase on the frequency of the TNF-238 GA genotype in MPN patients compared to controls (OR=2.21, 95% CI=1.02-4.80, P<0.04). The distribution of the genotypes and allelic frequencies of TNF-308 was significantly different among the MPNs, JAK2V617F positive, PV and PMF, and controls. Our data has demonstrated that the polymorphisms on TNF-238 GA, TNF-308 GA were associated to MPN development in this population, triggered by JAK2 V617F mutation.

Genetics factors associated with myelodysplastic syndromes.

The myelodysplastic syndromes (MDS) are a clinically and cytogenetically heterogeneous group of clonal diseases. Clonal chromosomal abnormalities are observed in 30-50% of patients with MDS. The deletions are among the most common alterations, and often involve the long arms of chromosomes 5, 7, 8, 13, and 20 and the short arms of chromosomes 12 and 17. The advent of new technologies for the detection of genetic abnormalities led to the description of a new set of recurrent mutations, leading to new insights into the pathophysiology of MDS. The recent recognition that genes involved in the regulation of histone function (EZH2, ASXL1, and UTX) and DNA methylation (DNMT3A, IDH1/IDH2, and TET2) are frequently mutated in MDS, has led to the proposal that there is an important link between genetic and epigenetic alterations in this disease. In fact, regulatory factors have also been considered as miR-143/miR-145, miR-146a, miR-125a and MiR-21. Somatic mutations may influence the clinical phenotype but are not included in current prognostic scoring systems. In recent years research has brought new insights into these diseases, but few of the findings are sufficiently robust to be incorporated into the clinical routine at this time. Thus, the aim of this study was to review the role of genetic factors involved in the diagnosis and development of the different phenotypes of MDS.

Association of cytokine genetic polymorphisms with the humoral immune response to recombinant vaccine against HBV in infants.

The prevention of hepatitis B by vaccination is one the most efficient tools to avoid the transmission of the virus, although a considerable variability to the anti-HBsAg antibody response has been described. Recently, polymorphisms of cytokine regulating genes have been described which seem to influence the immune response to various antigens. This article's objective was to evaluate the influence of cytokine genetic polymorphisms onto the humoral immune response to hepatitis B vaccine in infants. Vaccinated children were classified according to the level of anti-HBsAg antibody titles. The genotyping for TNF (-308), TGFB1 (+869, +915), IL-10 (-1082, -819, -592), IL-6 (-174), and IFNG (+874) was accomplished by the PCR-SSP technique. The TNF (-308) allele A presented a lower but not statistically significant frequency at 5% level in high responder patients (3.7% vs. 12.3%, P = 0.0919). The same was seen for the TNF (-308) genotype GA (7.4% vs. 24.5%, P = 0.0757). Further studies in other populations and evaluation of a greater number of individuals may contribute for a better understanding of the cytokine gene polymorphism influence in general and TNF polymorphism more specifically in the humoral immune response to the HBsAg vaccination in newborn children.

Methods for blood group antigens detection: cost-effectiveness analysis of phenotyping and genotyping.

BACKGROUND: Alloimmunization is a major problem in transfusion practice due to the clinical complications of the patients and the difficulty of choosing a unit of compatible blood product. Serological methods are widely used in blood banks, but they not always determine the phenotype. Thus, genotyping is an important complement to the serology tool as it allows one to predict the phenotype from deoxyribonucleic acid (DNA) with high accuracy. OBJECTIVE: To compare the centrifugation gel, microarray, Restriction Fragment Length Polymorphismone PCR (PCR-RFLP) and Sequence-Specific Primer PCR (PCR-SSP) techniques, in terms of cost, reaction time and reliability of the results. METHODS: The RHCE, Kidd, Kell and Duffy blood group systems were chosen to determine the approximate cost of each technique, considering the reagents used in both methods and considering only one sample. The time required for the development of each reaction was obtained at the Maringa Regional Blood Center and Immunogenetics Laboratory at the State University of Maringa. Data from Microarray reactions were obtained at the Campinas Blood Center. The results of phenotyping and genotyping of the 16 samples were compiled in a spreadsheet and compared. RESULTS: The PCR-SSP was more economical compared to other methods, and the serological method was faster than the molecular methods. However, all methods proved to be effective and safe in the detection of erythrocyte antigens. CONCLUSION: Analyzing the advantages and limitations of the molecular and serological methods tested in this study, we note that both are important and complementary. However, the choice of a methodology depends on the reality and needs of each health service.

Vitamin D Receptor Gene Polymorphisms Are Associated With Leprosy in Southern Brazil.

Vitamin D, together with its nuclear receptor (VDR), plays an important role in modulating the immune response, decreasing the inflammatory process. Some polymorphisms of the VDR gene, such as BsmI (G>A rs1544410), ApaI (G>T rs7975232), and TaqI (T>C rs731236) could affect its stability and mRNA transcription activity, while FokI T>C (rs2228570) gives a truncated protein with three fewer amino acids and more efficiency in binding vitamin D. This study evaluated these four polymorphisms in the immunopathogenesis of leprosy in 404 patients and 432 control individuals without chronic or infectious disease in southern Brazil. When analyzing differences in the allele and genotype frequency of polymorphisms between patients (leprosy per se, multibacillary, and paucibacillary clinical forms) and controls, we found no statistically significant association. Regarding haplotype analysis, the bAt haplotype was associated with protection from leprosy per se (P = 0.004, OR = 0.34, CI = 0.16-0.71) and from the multibacillary clinical form (P = 0.005, OR = 0.30, CI = 0.13-0.70). In individuals aged 40 or more years, this haplotype has also showed protection against leprosy per se and multibacillary (OR = 0.26, CI = 0.09-0.76; OR = 0.26, CI = 0.07-0.78, respectively), while the BAt haplotype was a risk factor for leprosy per se in the same age group (OR = 1.34, CI = 1.04-1.73). In conclusion, despite having found no associations between the VDR gene polymorphisms with the development of leprosy, the haplotypes formed by the BsmI, ApaI, and TaqI polymorphisms were associated with leprosy per se and the multibacillary clinical form.

Association of TNF, IL12, and IL23 gene polymorphisms and psoriatic arthritis: meta-analysis.

BACKGROUND: Psoriatic arthritis (PsA) is a chronic skin and joint condition that considerably affects patient quality of life. Several studies have demonstrated different associations of genetic polymorphisms in the pathogenic process of PsA. Therefore, we conducted a meta-analysis to estimate the effect of polymorphisms in the cytokines TNF, IL12B, IL23A, and IL23R on PsA risk. METHODS: We screened 1,097 abstracts and identified 14 relevant studies published between January 2007 and December 2017. A systematic search was conducted in PubMed, Web of Knowledge and Scopus databases. Meta-analyses were performed for the comparisons of alleles and multiple genetic models. RESULTS: Among the cytokines studied, we found 17 polymorphisms that were the most investigated. The association to PsA was observed in the presence of polymorphisms: TNF-238 G > A (rs361525), -308 G > A (rs1800629), and -857 C > T (rs1799724); IL12B C > G (rs6887695) and A > C (rs3212227); IL23A A > G (rs2066808) and IL23R G > A (rs11209026). CONCLUSION: Our findings suggest that these variant cytokine genes may strongly influence the immunological response of PsA.

Cytokine gene polymorphisms in populations from Parana, Southern Brazil.

In this study, were genotyped 22 single nucleotide polymorphisms (SNPs) in 13 genes that encode the pro-inflammatory (IL-1α, IL-1ß, IL-1R, IL-4Rα, IL-12, IFN-γ, TNF-α, and IL-2) and anti-inflammatory (IL-1RA, TGF-ß, IL-4, IL-6 and IL-10) cytokines of 350 individuals by PCR-SSP (polymerase chain reaction - sequence specific primer). A total of 473 individuals were genotyped for IL17A and IL17F genes by PCR-RFLP (restriction fragment length polymorphism). The sample consisted of healthy and unrelated subjects from a mixed population from Parana state, in the South region of Brazil. The frequency analyses and genotype data are available in the Supplementary materials and are accessible at Allele Frequency Net Database (AFND).

Study of the myenteric and submucous plexuses after BAC treatment in the intestine of rats.

A morphological and quantitative study in the ileal and colonic myenteric and submucous plexuses of rats after BAC denervation was performed. Four groups were employed: SI--ileum control; CBI--denervated ileum; SC--colon control; and CBC--denervated colon. We used the Myosin-V immunohistochemistry technique to study the myenteric and submucous plexuses. In the submucous plexus of the ileum and colon there was not a significant decrease in the number of neurons/mm2 and of ganglia/mm2. The denervation of the myenteric plexus in the group CBI was 44.7% and in the group CBC, 68.3%. In the myenteric plexus there was also a significant decrease in the number of ganglia/mm2 (13.8% in group CBI and 52.14% in group CBC) and in the number of neurons/ganglion (33.9% in group CBI and 39.6% in group CBC). The morphological analyses showed that there was an alteration in the shape of the ganglia of the ileal and colonic myenteric plexus. The area of the cell bodies had a significant increase both in the myenteric and the submucous plexus in groups CBI and CBC. These data demonstrate that the BAC treatment causes morphologic and quantitative changes in the myenteric plexus and quantitative changes in the cell body area of the submucous plexus.

Methods for blood group antigens detection: cost-effectiveness analysis of phenotyping and genotyping

Abstract Background Alloimmunization is a major problem in transfusion practice due to the clinical complications of the patients and the difficulty of choosing a unit of compatible blood product. Serological methods are widely used in blood banks, but they not always determine the phenotype. Thus, genotyping is an important complement to the serology tool as it allows one to predict the phenotype from deoxyribonucleic acid (DNA) with high accuracy. Objective To compare the centrifugation gel, microarray, Restriction Fragment Length Polymorphismone PCR (PCR-RFLP) and Sequence-Specific Primer PCR (PCR-SSP) techniques, in terms of cost, reaction time and reliability of the results. Methods The RHCE, Kidd, Kell and Duffy blood group systems were chosen to determine the approximate cost of each technique, considering the reagents used in both methods and considering only one sample. The time required for the development of each reaction was obtained at the Maringa Regional Blood Center and Immunogenetics Laboratory at the State University of Maringa. Data from Microarray reactions were obtained at the Campinas Blood Center. The results of phenotyping and genotyping of the 16 samples were compiled in a spreadsheet and compared. Results The PCR-SSP was more economical compared to other methods, and the serological method was faster than the molecular methods. However, all methods proved to be effective and safe in the detection of erythrocyte antigens. Conclusion Analyzing the advantages and limitations of the molecular and serological methods tested in this study, we note that both are important and complementary. However, the choice of a methodology depends on the reality and needs of each health service.

Importance of immune response genes in hemophilia A.

Hemophilia A is a disease caused by a deficiency of coagulation factor VIII resulting from genetic inheritance linked to chromosome X. One treatment option is the administration of plasma or recombinant FVIII. However, some patients develop inhibitors or antibodies against this factor. Inhibitors are alloantibodies that bind to the epitope of factor VIII causing it to be recognized by the immune system as a foreign peptide. This is the most serious complication in hemophilia patients in respect to replacement therapy. Some studies have suggested that genetic factors influence the development of factor VIII inhibitors such as ethnicity, family history, mutations in the factor VIII gene and in genes of the immune system. The aim of this study was to conduct a literature review to assess the influence of genetic factors of immune response genes, especially genes of the major histocompatibility complex and cytokines, which may be related to the development of factor VIII inhibitors in hemophilia A patients. Understanding these risk factors will help to determine future differential treatment in the control and prevention of the development of inhibitors.

Frequências fenotípicas dos grupos sanguíneos Kell, Duffy e Kidd em doadores de sangue do Hemonúcleo de Apucarana, sul do Brasil / Phenotypic frequencies of the Kell, Duffy and Kidd blood groups in blood donors from Apucarana Blood Center, southern Brazil

Objetivo: O objetivo desse estudo foi determinar as frequências fenotípicas dos grupos sanguíneos Kell, Duffy e Kidd em uma população paranaense. Métodos: Foram avaliadas as frequências desses grupos sanguíneos em 1.759 doadores de sangue fenotipados no Hemonúcleo de Apucarana, sul do Brasil. A fenotipagem foi realizada pela aglutinação em gel-teste e os dados foram obtidos pelo sistema Report Smith-Access, da rede Hemepar. Resultados: Essa população apresentou uma distribuição das frequências fenotípicas de Kell, Kidd e Duffy compatível com populações caucasianas. Para averiguar esse fato, nós comparamos nossos dados com aqueles de uma população da mesma região do Paraná, composta principalmente por caucasianos. O fenótipo Fy(a+b-) foi mais frequente na população de Apucarana do que na população de Maringá (22,68 vs. 12,50%, P<0,001), enquanto que o fenótipo Fy (a+b+) foi menos frequente (37,24 vs. 48,0%, P<0,001). Conclusão: As frequências fenotípicas de três grupos sanguíneos foram determinadas e poderão ser utilizadas pelos Serviços de Hematologia e Hemoterapia na busca de unidades de concentrados de hemácias com fenótipos desejados e no cálculo da incidência de doadores compatíveis, em casos de receptores com múltiplos aloanticorpos, além de poderem ser utilizadas para comparações antropológicas e em estudos de associação com doenças.

Infertilidade masculina decorrente de microdeleções no cromossomo Y / Male infertility caused by microdeletions on Y chromosome

Objetivo: Abordar a infertilidade masculina causada pela microdeleção no cromossomo Y e apresentar possíveis tratamentos por meio das técnicas de reprodução humana assistida. Métodos: Levantamento de dados da literatura científica na área da medicina reprodutiva. Resultados: Quando comparadas com outras causas de infertilidade, as microdeleções do cromossomo Y são relativamente frequentes. O cromossomo Y é essencial para a determinação sexual masculina e no seu braço longo há regiões responsáveis pela espermatogênese. São elas AZFa, AZFb e AZFc. Essas regiões podem ser deletadas e por conter múltiplos genes essenciais para a espermatogênese podem causar infertilidade masculina. Graças aos avanços da medicina, hoje vários casos de infertilidade são tratáveis por meio das técnicas de reprodução assistida. Dentre as técnicas, a MSOME se destaca por ser uma metodologia que seleciona apenas espermatozoides morfologicamente normais para serem usados na inseminação e aumentar as chances de gestação. Conclusões: A infertilidade masculina tem aumentado consideravelmente nos últimos anos e as causas genéticas são uma das grandes consequências disso. As microdeleções do cromossomo Y podem causar desde uma oligozoospermia leve a uma azoospermia, a depender da região AZF afetada. Para as causas mais leves, o casal pode recorrer a algumas técnicas de reprodução assistida e para as causas mais graves a solução para o casal pode ser usar gametas doados.(AU)

Objective: Address male infertility caused by microdeletions on Y chromosome and present possible treatment through assisted human reproduction techniques. Methods: Survey data from the scientific literature in the field of reproductive medicine. Results: When compared with other causes of infertility, the microdeletions on Y chromosome are the relatively frequent. The Y chromosome is essential for male sex determination and there are in his long arm regions responsible for spermatogenesi, it's they AZFa, AZFb and AZFc. Such regions may be deleted causing male infertility by contain multiple genes essential for spermatogenesis. Thanks to advances in medicine, now several cases of infertility are treatable through assisted reproduction techniques. Among the techniques, the MSOME stands out as a methodology that selects only morphologically normal sperm to be used in insemination increasing the chances of pregnancy. Conclusions: Male infertility has increased considerably in recent years and the genetic causes are one ofthe major consequences ofthis. Y chromosome microdeletions can cause mild oligozoospermia or azoospermia depending on the AZF region affected. For lighter causes, the couple may use some assisted reproductive techniques and to the most serious causes the solution to the couple is using donated gametes.(AU)

Importance of immune response genes in hemophilia A

Hemophilia A is a disease caused by a deficiency of coagulation factor VIII resulting from genetic inheritance linked to chromosome X. One treatment option is the administration of plasma or recombinant FVIII. However, some patients develop inhibitors or antibodies against this factor. Inhibitors are alloantibodies that bind to the epitope of factor VIII causing it to be recognized by the immune system as a foreign peptide. This is the most serious complication in hemophilia patients in respect to replacement therapy. Some studies have suggested that genetic factors influence the development of factor VIII inhibitors such as ethnicity, family history, mutations in the factor VIII gene and in genes of the immune system. The aim of this study was to conduct a literature review to assess the influence of genetic factors of immune response genes, especially genes of the major histocompatibility complex and cytokines, which may be related to the development of factor VIII inhibitors in hemophilia A patients. Understanding these risk factors will help to determine future differential treatment in the control and prevention of the development of inhibitors.

Study of the myenteric and submucous plexuses after BAC treatment in the intestine of rats

A morphological and quantitative study in the ileal and colonic myenteric and submucous plexuses of rats after BAC denervation was performed. Four groups were employed: SI--ileum control; CBI--denervated ileum; SC--colon control; and CBC--denervated colon. We used the Myosin-V immunohistochemistry technique to study the myenteric and submucous plexuses. In the submucous plexus of the ileum and colon there was not a significant decrease in the number of neurons/mm2 and of ganglia/mm2. The denervation of the myenteric plexus in the group CBI was 44.7

and in the group CBC, 68.3

. In the myenteric plexus there was also a significant decrease in the number of ganglia/mm2 (13.8

in group CBI and 52.14

in group CBC) and in the number of neurons/ganglion (33.9

in group CBI and 39.6

in group CBC). The morphological analyses showed that there was an alteration in the shape of the ganglia of the ileal and colonic myenteric plexus. The area of the cell bodies had a significant increase both in the myenteric and the submucous plexus in groups CBI and CBC. These data demonstrate that the BAC treatment causes morphologic and quantitative changes in the myenteric plexus and quantitative changes in the cell body area of the submucous plexus.