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Epidemiología genética de la artritis reumatoide: ¿qué esperar de América Latina?

Authors: Delgado-Vega, Angélica María; Martín, Javier; Granados, Julio; Anaya, Juan Manuel;

Epidemiología genética de la artritis reumatoide: ¿qué esperar de América Latina?

Abstract

La artritis reumatoide es una enfermedad sistémica autoinmune, crónica, que afecta principalmente las articulaciones que tienen movimiento. La enfermedad es mucho más frecuente en mujeres y su prevalencia en la población latinoamericana es cercana al 0,5%. La existencia de agregación familiar (ls= 2-17) indica su carácter hereditario. Sin embargo, la herencia de la artritis reumatoide es poligénica y no sigue un patrón mendeliano. La importancia de encontrar factores genéticos asociados con la artritis reumatoide radica en la contribución a la comprensión de los mecanismos patogénicos de la enfermedad, su posible aplicación clínica como marcadores de riesgo, diagnóstico, pronóstico, e incluso, blanco terapéutico. Mapeos genéticos llevados a cabo en diversas poblaciones en busca de loci y genes candidatos han identificado la región HLA como aquella con mayor evidencia de ligamento. Sin embargo, su fracción etiológica corresponde sólo a un tercio de la susceptibilidad genética de la enfermedad. Esto indica que genes diferentes al HLA también están implicados en la susceptibilidad a desarrollar artritis reumatoide. En Latinoamérica, los alelos HLA-DRB1*0404 y TNF -308A han sido asociados de manera uniforme con la artritis reumatoide. En el presente artículo se revisan los factores genéticos de la artritis reumatoide en el marco de una aproximación lógica y ordenada establecida por la epidemiología genética, y se ofrecen algunas recomendaciones para futuros estudios en poblaciones latinoamericanas.

Rheumatoid arthritis is a chronic and systemic autoimmune disease characterized by inflammation and destruction of the synovial joints. It affects approximately 0.5% of the Latin-American population and is three times more common in women than in men. Evidence of familial aggregation (ls=2-17) was the first indication of a genetic susceptibility to disease. As in other autoimmune diseases, it has a complex genetic basis. Results from whole-genome scans indicate that the HLA region contains a significant and consistent set of linked loci. However, HLA accounts for only one-third of the genetic susceptibility of disease, indicating that non-HLA genes are also involved in the disease susceptibility. In Latin-America, association with HLA-DRB1*0404 and TNF -308A alleles has been uniformly established; however, many other candidate genes remain to be studied. The identification of genetic factors conferring susceptibility to rheumatoid arthritis will contribute to the knowledge of the pathogenic mechanisms, ability to predict its occurrence, the development of diagnostic tools, prognosis, and treatment. The genetic epidemiology of rheumatoid arthritis is herein reviewed; a set of recommendations is provided for the design, analysis and interpretation of genetic association studies in the context of Latin-American populations.

Trabajo parcialmente presentado en forma oral durante el Simposio de Inmunogenética; 23 de febrero de 2006, Medellín, Colombia.

Este trabajo fue financiado por la Corporación para Investigaciones Biológicas y la Universidad del Rosario.

Peer reviewed

Country
Spain
Keywords

rheumatoid arthritis, Epidemiology, Major histocompatibilitycomplex, Autoimmune diseases, RC955-962, Major histocompatibility complex, enfermedades autoinmunes, Artritis reumatoide, Complejo mayor de histocompatibilidad, complejo mayor de histocompatibilidad, América Latina, Enfermedades autoinmunes, Arctic medicine. Tropical medicine, Epidemiología, autoimmune diseases, HLA antigens, Rheumatoid arthritis, epidemiología, Complejomayor de histocompatibilidad, R, major histocompatibility complex, antígenos HLA, Latin America, Antígenos HLA, Medicine, epidemiology, artritis reumatoide

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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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