Examinando por Autor "Iglesias, Antonio"
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Ítem Asociación de variantes polimórficas de los sistemas PTPN22, TNF y VDR en niños con nefritis lúpica: un estudio en tríos de familias colombianas(Instituto Nacional de Salud, 2017) Garavito, Gloria; Egea, Eduardo; Fang, Luis; Malagón, Clara; Olmos, Carlos; González, Luz; Guarnizo, Pilar; Aroca, Gustavo; López, Guillermo; Iglesias, AntonioIntroducción. El lupus eritematoso sistémico es una enfermedad autoinmune cuya gravedad varía según la raza, género y edad de aparición. Esta disparidad también se observa en los marcadores genéticos asociados con la enfermedad presentes en los genes PTPN22, VDR y TNF. La estratificación genética que presentan las diferentes poblaciones en el mundo puede estar influyendo dicha variabilidad. Objetivo. Analizar la asociación y heredabilidad de variantes genéticas de los genes PTPN22, VDR y TNF con nefritis lúpica pediátrica (NLp) en familias colombianas. Materiales y métodos. Se realizó un estudio basado en familias con 46 tríos (caso/padre y madre). Se genotipificaron las variantes rs2476601 de PTPN22; rs361525 y rs1800629 de TNF; TaqI [rs731236], ApaI [rs7975232], BsmI [rs1544410] y FokI [rs2228570] de VDR mediante qPCR. Se estimó el efecto de la sobretransmisión del alelo de riesgo de padres a hijos y el desequilibrio de ligamiento de los loci VDR y TNF. Resultados. Se observó que el alelo A de rs2476601 en PTPN22 se distribuyó en el 8,69 % [n=16] de los padres mientras que en los casos es de 19,5 % [n=18] al igual que es sobretransmitido de padres a hijos 17 veces más con relación al alelo G (p=0,028). Los polimorfismos de TNF y VDR no se mostraron en desequilibrio de transmisión. Las variantes TaqI, ApaI y BsmI del VDR se mostraron en desequilibrio de ligamiento. Conclusión. Estos hallazgos muestran una asociación del polimorfismo rs2476601 de PTPN22 con NLp debido a su sobretransmisión en el grupo de familias estudiadas.Ítem Association of FokI polymorphism of the VDR genewith systemic lupus erythematosus in anadolescent population of the Colombian Caribbean(Elsevier, 2023) Garavito, Gloria; Fang, Luis; Domínguez-Vargas, Alex; Moreno-Woo, Ana; López-Luch, Guillermo; Iglesias, Antonio; Aroca, Gustavo; Egea, EduardoVitamin D and vitamin D receptor (VDR) polymorphisms are associated withautoimmune diseases including systemic lupus erythematosus (SLE). The aim of this studyis to assess the genetic association between VDR polymorphisms: TaqI, ApaI, Bsml and FokIand SLE with serum levels of Vitamin D in the Colombian Caribbean population.Method: Case and control study. One hundred and thirty-three patients with SLE and 100healthy individuals were included. VDR polymorphism were genotyped by RT-PCR andTaqman®probes. Allelic, genotypic and haplotype associations were estimated. Serum vita-min D concentrations were quantified by Elisa. Values of 30 to 100 ng/ml were establishedas a normal reference range. P values <.05 were considered statistically significant.Results: A high prevalence of SLE was observed in women (94%) and was associated witha higher risk of SLE [OR: 10.8; 95% CI: 4.7–24.6] (p < .05). Moreover, higher risk of SLE wasobserved in individuals with FokI VDR [rs2228570] [OR: 1.58; 95% CI: 1.05−2.36] in allelic mod-els. The ACCA Haplotype of TaqI/ApaI/Bsml/FokI polymorphisms was associated with higherrisk of SLE [OR = 2.28, 95% CI = 1.12−4.66, psim <.01]. Vitamin D deficiency was evidenced in11.3% of the patients.Ítem Profiling analysis of circulating microRNA in peripheral blood of patients with class IV lupus nephritis(Xu-jie Zhou, Peking University First Hospital, CHINA, 2017-11-14) Navarro-Quiroz, Elkin; Pacheco-Lugo, Lisandro; Navarro-Quiroz, Roberto; Lorenzi, Hernan; España-Puccini, Pierine; DõÂaz-Olmos, Yirys; Almendrales, Lisneth; Olave, Valeria; Gonzalez-Torres, Henry; Diaz-Perez, Anderson; Dominguez, Alex; Iglesias, Antonio; García, Raul; Aroca-Martinez, GustavoRenal involvement in Systemic Lupus Erythematous (SLE) patients is one of the leading causes of morbidity and a significant contributor to mortality. It's estimated that nearly 50% of SLE individuals develop kidney disease in the first year of the diagnosis. Class IV lupus nephritis (LN-IV) is the class of lupus nephritis most common in Colombian patients with SLE. Altered miRNAs expression levels have been reported in human autoimmune diseases including lupus. Variations in the expression pattern of peripheral blood circulating miRNAs specific for this class of lupus nephritis could be correlated with the pathophysiological status of this group of individuals. The aim of this study was to evaluate the relative abundance of circulating microRNAs in peripheral blood from Colombian patients with LN-IV. Circulating miRNAs in plasma of patients with diagnosis of LN-IV were compared with individuals without renal involvement (LNN group) and healthy individuals (CTL group). Total RNA was extracted from 10 ml of venous blood and subsequently sequenced using Illumina. The sequences were processed and these were analyzed using miRBase and Ensembl databases. Differential gene expression analysis was carried out with edgeR and functional analysis were done with DIANA-miRPath. Analysis was carried out using as variables of selection fold change ( 2 o -2) and false discovery rate (0.05). We identified 24 circulating microRNAs with differential abundance between LN-IV and CTL groups, fourteen of these microRNAs are described for the first time to lupus nephritis (hsa-miR-589-3p, hsa-miR-1260b, hsa-miR-4511, hsa-miR- 485-5p, hsa-miR-584-5p, hsa-miR-543, hsa-miR-153-3p, hsa-miR-6087, hsa-miR-3942-5p, hsa-miR-7977, hsa-miR-323b-3p, hsa-miR-4732-3p and hsa-miR-6741-3p). These changes in the abundance of miRNAs could be interpreted as alterations in the miRNAs-mRNA regulatory network in the pathogenesis of LN, preceding the clinical onset of the disease. The findings thus contribute to understanding the disease process and are likely to pave the way towards identifying disease biomarkers for early diagnosis of LN.