Genetically determined Amerindian ancestry correlates with increased frequency of risk alleles for systemic lupus erythematosus

Objective To assess whether genetically determined Amerindian ancestry predicts increased presence of risk alleles of known susceptibility genes for systemic lupus erythematosus (SLE). Methods Single-nucleotide polymorphisms (SNPs) within 16 confirmed genetic susceptibility loci for SLE were genotyped in a set of 804 Mestizo lupus patients and 667 Mestizo healthy controls. In addition, 347 admixture informative markers were genotyped. Individual ancestry proportions were determined using STRUCTURE. Association analysis was performed using PLINK, and correlation between ancestry and the presence of risk alleles was analyzed using linear regression. Results A meta-analysis of the genetic association of the 16 SNPs across populations showed that TNFSF4 , STAT4 , ITGAM , and IRF5 were associated with lupus in a Hispanic Mestizo cohort enriched for European and Amerindian ancestry. In addition, 2 SNPs within the major histocompatibility complex region, previously shown to be associated in a genome-wide association study in Europeans, were also associated in Mestizos. Using linear regression, we predicted an average increase of 2.34 risk alleles when comparing an SLE patient with 100% Amerindian ancestry versus an SLE patient with 0% Amerindian ancestry ( P < 0.0001). SLE patients with 43% more Amerindian ancestry were predicted to carry 1 additional risk allele. Conclusion Our results demonstrate that Amerindian ancestry is associated with an increased number of risk alleles for SLE.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/78480/1/27753_ftp.pd

Transancestral mapping and genetic load in systemic lupus erythematosus

Systemic lupus erythematosus (SLE) is an autoimmune disease with marked gender and ethnic disparities. We report a large transancestral association study of SLE using Immunochip genotype data from 27,574 individuals of European (EA), African (AA) and Hispanic Amerindian (HA) ancestry. We identify 58 distinct non-HLA regions in EA, 9 in AA and 16 in HA (∼50% of these regions have multiple independent associations); these include 24 novel SLE regions (P<5 × 10-8), refined association signals in established regions, extended associations to additional ancestries, and a disentangled complex HLA multigenic effect. The risk allele count (genetic load) exhibits an accelerating pattern of SLE risk, leading us to posit a cumulative hit hypothesis for autoimmune disease. Comparing results across the three ancestries identifies both ancestry-dependent and ancestry-independent contributions to SLE risk. Our results are consistent with the unique and complex histories of the populations sampled, and collectively help clarify the genetic architecture and ethnic disparities in SLE

Transancestral mapping and genetic load in systemic lupus erythematosus

Systemic lupus erythematosus (SLE) is an autoimmune disease with marked gender and ethnic disparities. We report a large transancestral association study of SLE using Immunochip genotype data from 27,574 individuals of European (EA), African (AA) and Hispanic Amerindian (HA) ancestry. We identify 58 distinct non-HLA regions in EA, 9 in AA and 16 in HA (∼50% of these regions have multiple independent associations); these include 24 novel SLE regions (P<5 × 10-8), refined association signals in established regions, extended associations to additional ancestries, and a disentangled complex HLA multigenic effect. The risk allele count (genetic load) exhibits an accelerating pattern of SLE risk, leading us to posit a cumulative hit hypothesis for autoimmune disease. Comparing results across the three ancestries identifies both ancestry-dependent and ancestry-independent contributions to SLE risk. Our results are consistent with the unique and complex histories of the populations sampled, and collectively help clarify the genetic architecture and ethnic disparities in SLE.info:eu-repo/semantics/publishedVersio

Transancestral mapping and genetic load in systemic lupus erythematosus

Systemic lupus erythematosus (SLE) is an autoimmune disease with marked gender and ethnic disparities. We report a large transancestral association study of SLE using Immunochip genotype data from 27,574 individuals of European (EA), African (AA) and Hispanic Amerindian (HA) ancestry. We identify 58 distinct non-HLA regions in EA, 9 in AA and 16 in HA (B50% of these regions have multiple independent associations); these include 24 novel SLE regions (Po5 10 8), refined association signals in established regions, extended associations to additional ancestries, and a disentangled complex HLA multigenic effect. The risk allele count (genetic load) exhibits an accelerating pattern of SLE risk, leading us to posit a cumulative hit hypothesis for autoimmune disease. Comparing results across the three ancestries identifies both ancestry-dependent and ancestry-independent contributions to SLE risk. Our results are consistent with the unique and complex histories of the populations sampled, and collectively help clarify the genetic architecture and ethnic disparities in SL

Development of low-cost remote sensing tools and methods for supporting smallholder agriculture.

Agricultural UAV-based remote sensing tools to facilitate decision-making for increasing productivity in developing countries were developed and tested. Specifically, a high-quality multispectral sensor and sophisticated-yet-user-friendly data processing techniques (software) under an open-access policy were implemented. The multispectral sensor—IMAGRI-CIP—is a low-cost adaptable multi-sensor array that allows acquiring high-quality and low-SNR images from a UAV platform used to estimate vegetation indexes such as NDVI. Also, a set of software tools that included wavelet-based image alignment, image stitching, and crop classification have been implemented and made available to the remote sensing community. A validation field experiment carried out at the International Potato Center facilities (Lima, Peru) to test the developed tools is reported. A thorough comparison study with a wide-used commercial agricultural camera showed that IMAGRI-CIP provides highly correlated NDVI values (R2≥ 0.8). Additionally, an application field experiment was conducted in Kilosa, Tanzania, to test the tools in smallholder farm settings, featuring high-heterogeneous crop plots. Results showed high accuracy (> 82%) to identify 13 different crops either as mono-crop or as mixed-crops

Tuberculosis y migración interna en un área endémica del sur del Perú

To determine the proportion of tuberculosis cases in families of an immigrant population, we explored some social, economic, and demographic variables to help is understand this phenomenon. We conducted a population-based crosssectional study between August and September, 2004 in Parcona district, province and department of Ica, Peru. The prevalence of families with cases of tuberculosis in the district of Parcona was 4.6%, and this was higher in poor families, overcrowded households and lifetime migrant families. In conclusion, this study shows that migrant populations are an important vulnerable group not only for TB infection but also for other infectious diseases in our country. further similar studies in other regions should be carried out to address this subject.Con el objetivo de determinar la proporción de familias con casos de tuberculosis en una población inmigrante, se exploró algunas variables sociales, económicas y demográficas que ayuden a entender este fenómeno. Realizamos un estudio descriptivo de corte transversal de base poblacional entre los meses de agosto y septiembre del 2004, en el distrito de Parcona en la región Ica, en Perú. La prevalencia de familias con casos de tuberculosis fue de 4,6% y esta fue mayor en las familias pobres, en hogares con hacinamiento y en familias migrantes de toda la vida. Nuestra investigación muestra que los migrantes constituyen un grupo vulnerable importante en nuestro país, no sólo para enfermar de tuberculosis sino con otras enfermedades infecciosas. Por lo mismo, se deben realizar más estudios en otras regiones para abordar este problema

Attenuated response to purified protein derivative in patients with rheumatoid arthritis: study in a population with a high prevalence of tuberculosis

Objectives: To evaluate the response to PPD in patients with RA and to compare it with that of control subjects. Methods: 112 patients with RA and 96 healthy controls were studied. PPD 5 U was applied using the Mantoux method, and skin reaction was measured at 72 hours. The reaction was considered negative for PPD <5 mm. Results: There were no significant differences in age, sex, history of bacille Calmette-Guerin vaccination, or tuberculosis contact between the two groups. The median size of the PPD induration in the patients with RA was significantly less than that in the control group (4.5 v 11.5 mm, p<0.01). 79 (70.6%) patients with RA compared with 25 (26%) of the control group had a negative reaction to PPD (p<0.01), a response not influenced by disease activity or duration of disease in the patients with RA. Conclusion: A PPD skin test is not an appropriate test for recognising LTBI in patients with RA in our population

Guía de práctica clínica para el diagnóstico y manejo de la osteoartritis en el Seguro Social del Perú (EsSalud)

Este artículo resume la guía de práctica clínica (GPC) para el diagnóstico y manejo de pacientes con osteoartritis (OA) del Seguro Social del Perú (EsSalud). Para su desarrollo se conformó un grupo elaborador de la guía (GEG) que incluyó a especialistas clínicos y metodólogos. Para responder las 13 preguntas clínicas planteadas se realizaron búsquedas sistemáticas en PubMed y repositorios de GPC. Se usó la metodología Grading of Recommendations Assessment, Development, and Evaluation (GRADE) para evaluar la certeza de la evidencia. Se emitieron 11 recomendaciones: tres fuertes (no solicitar de forma rutinaria radiografías para el diagnóstico de OA, brindar un plan individualizado de medidas de educación y autocuidado, indicar la realización de ejercicio físico) y ocho débiles (intervenciones para reducir el peso en personas con obesidad o sobrepeso, evitar el uso de paracetamol para el manejo de OA, promover el uso de AINE orales para el manejo de OA, evitar el uso de condroitín sulfato para el manejo de OA, evitar el uso de proloterapia para el manejo de OA, en adultos con OA y dolor refractario a manejo farmacológico considerar terapias adyuvantes como ultrasonido o similares, evitar el uso de terapia laser como adyuvante para el manejo de OA, evitar el uso de acupuntura para el manejo de OA); además, 20 puntos de buena práctica clínica y un flujograma de trabajo