@article {8095, title = {Vitamin D receptor polymorphisms and expression profile in rheumatoid arthritis brazilian patients.}, journal = {Mol Biol Rep}, year = {2015}, month = {2015 Dec 19}, abstract = {

Rheumatoid arthritis (RA) is an autoimmune disease characterized by chronic inflammation and important joint commitment, being the most common systemic autoimmune disease worldwide. RA displays important genetic background with a variety of genes contributing to the immune balance breakdown. Recent studies have demonstrated that vitamin D, through its receptor (VDR), is able to regulate the immune balance and suppress the autoimmunity process, being a potential target in autoimmune diseases. In the present genetic association study, we assessed 5 Tag single nucleotide polymorphisms (SNPs) (rs11168268, rs2248098, rs1540339, rs4760648 and rs3890733), which cover most of the VDR gene, in three different Brazilian populations (from Northeast, Southeast and South Brazil). We also evaluated the VDR expression profile in whole blood and monocytes from RA patients. For genotyping study, 428 RA patients and 616 healthy controls were genotyped with fluorogenic allele specific probes on an ABI7500 platform. For gene expression study, VDR mRNA levels of 15 RA patients and 26 healthy individuals were assessed by RT-PCR. Our results showed that SNPs rs4760648 and rs3890733 are associated to RA susceptibility (p value~=~0.0026, OR 1.31 and p value~=~0.0091, OR 1.28 with statistical power~=~0.999 and 0.993, respectively). Regarding RA clinical features, the studied SNPs did not show significant associations. The gene expression assays showed that VDR mRNA levels were down regulated in both whole blood (-3.3 fold) and monocytes (-3.2 fold) of RA patients when compared to healthy controls. Our results, the first reported for distinct Brazilian populations, support a role of the VDR gene in the susceptibility to RA.

}, issn = {1573-4978}, doi = {10.1007/s11033-015-3937-z}, author = {Cavalcanti, Catarina Addobbati Jord{\~a}o and De Azev{\^e}do Silva, Jaqueline and de Barros Pita, Will and Veit, Tiago Degani and Monticielo, Odirlei Andre and Xavier, Ricardo Machado and Brenol, Jo{\~a}o Carlos Tavares and Brenol, Cleiton Viegas and Fragoso, Thiago Sotero and Barbosa, Alexandre Domingues and Duarte, {\^A}ngela Luiza Branco Pinto and Oliveira, Ren{\^e} Donizeti Ribeiro and Louzada-J{\'u}nior, Paulo and Donadi, Eduardo Ant{\^o}nio and Crovella, Sergio and Chies, Jos{\'e} Artur Bogo and Sandrin-Garcia, Paula} } @article {3492, title = {LIG4 and RAD52 DNA repair genes polymorphisms and systemic lupus erythematosus.}, journal = {Mol Biol Rep}, volume = {41}, year = {2014}, month = {2014}, pages = {2249-56}, abstract = {

Systemic lupus erythematosus (SLE) is a complex autoimmune disorder with a strong genetic background. Nevertheless, SLE might also be triggered due to environmental factors, such as UV light exposure. DNA double strand breaks (DSBs) may be induced secondarily by UV radiation, increasing DNA immunogenicity and in SLE patients DNA repair is diminished, allowing the accumulation of DSBs and genomic instability. LIG4 and RAD52 genes play important roles in DNA repair mechanisms and a recent microarray analysis showed their differential expression in active SLE patients. In this study we investigated a potential association between LIG4 and RAD52 single nucleotide polymorphisms (SNPs) and SLE predisposition in a Southeast Brazilian population. We assessed four Tag SNPs in LIG4 and three in RAD52 gene region, encompassing most of the gene sequence, in 158 SLE patients and 212 healthy controls. We also performed SNPs analysis considering clinical manifestation, gender and ethnicity in SLE patients. Our data did not show association between LIG4 and RAD52 SNPs and SLE, its clinical manifestations or ethnicity in the tested population. The analysis regarding ethnicity and SLE clinical manifestations indicated Caucasian-derived patients as more susceptible to cutaneous and hematological alterations than the African-derived. To our knowledge, this is the first association study involving LIG4 and RAD52 genes and SLE predisposition.

}, keywords = {Adult, Alleles, Brazil, Case-Control Studies, DNA Ligases, DNA Repair, Ethnic Groups, Female, Genetic Linkage, Genetic Predisposition to Disease, Genotype, Haplotypes, Humans, Lupus Erythematosus, Systemic, Male, Middle Aged, Odds Ratio, Polymorphism, Single Nucleotide, Rad52 DNA Repair and Recombination Protein}, issn = {1573-4978}, doi = {10.1007/s11033-014-3076-y}, author = {De Azev{\^e}do Silva, Jaqueline and Pancotto, Jo{\~a}o Alexandre Tr{\'e}s and Donadi, Eduardo Ant{\^o}nio and Crovella, Sergio and Sandrin-Garcia, Paula} } @article {1746, title = {Mannose binding lectin gene (MBL2) functional polymorphisms are associated with systemic lupus erythematosus in southern Brazilians.}, journal = {Hum Immunol}, volume = {72}, year = {2011}, month = {2011 Jun}, pages = {516-21}, abstract = {

Susceptibility to systemic lupus erythematosus (SLE) has been associated with immunologic, environmental, and genetic factors. To uncover a possible association between MBL2 gene polymorphisms and SLE, we analyzed functional polymorphisms in the promoter and first exon of the MBL2 gene in 134 Brazilian SLE patients and 101 healthy controls. Genotype and allele frequencies of MBL2 A/O polymorphism were significantly different between patients and controls, and the O allele was associated with an increased risk of SLE. An association between low mannose binding lectin (MBL) producer combined genotypes and increased risk for SLE was also reported. Furthermore, when stratifying SLE patients according to clinical and laboratory data, an association between the A/O genotype and nephritic disorders and between the X/Y genotype and antiphospholipid syndrome was evident. Combined genotypes responsible for low MBL production were more frequently observed in SLE patients with nephritis. Our results indicate MBL2 polymorphisms as possible risk factors for SLE development and disease-related clinical manifestations.

}, keywords = {Adolescent, Adult, Aged, Brazil, DNA Mutational Analysis, Female, Gene Frequency, Genetic Association Studies, Genetic Predisposition to Disease, Genotype, Humans, Lupus Erythematosus, Systemic, Male, Mannose-Binding Lectin, Middle Aged, Polymorphism, Genetic, Population Groups, Promoter Regions, Genetic}, issn = {1879-1166}, doi = {10.1016/j.humimm.2011.03.007}, author = {Sandrin-Garcia, Paula and Brand{\~a}o, Lucas Andr{\'e} Cavalcanti and Coelho, Ant{\^o}nio Victor Campos and Guimar{\~a}es, Rafael Lima and Pancoto, Jo{\~a}o Alexandre Tr{\'e}s and Segat, Ludovica and Donadi, Eduardo Ant{\^o}nio and de Lima-Filho, Jos{\'e} Luiz and Crovella, Sergio} }