Association of polymorphic variants of PTPN22, TNF and VDR genes in children with lupus nephritis: A study in Colombian family triads

Gloria Garavito, Eduardo Egea, Luis Fang, Clara Malagón, Carlos Olmos, Luz González, Pilar Guarnizo, Gustavo Aroca, Guillermo López, Antonio Iglesias, .

Keywords: Lupus erythematosus, systemic, lupus nephritis, linkage disequilibrium, genetic association studies

Abstract

Introduction: Systemic lupus erythematosus is an autoimmune disease in which the severity varies according to race, sex and age of onset. This variation is also observed in the genetic markers associated with the disease, including PTPN22, VDR and TNF genes. The genetic stratification in different populations worldwide can influence the variability.
Objective: To analyze the heritability of PTPN22, VDR and TNF genetic variants and their association with pediatric lupus nephritis in Colombian families.
Materials and methods: We conducted a family-based study including 46 triads (case, father and mother). The variants rs2476601 of PTPN22; rs361525 and rs1800629 of TNF, and TaqI [rs731236], ApaI [rs7975232], BsmI [rs1544410] and FokI [rs2228570] of VDR were genotyped by qPCR. The effects of overtransmission of the risk allele from parents to children and linkage disequilibrium at the VDR and TNF loci were estimated.
Results: We found that allele A of rs2476601 in PTPN22 was distributed among 8.69 % (n=16) of the parents and 19.5 % (n=18) of the cases; this allele was overtransmitted from parents to children 17 times more often than the G allele (p=0.028). TNF and VDR polymorphisms did not exhibit transmission disequilibrium. VDR TaqI, ApaI and BsmI variants exhibited linkage disequilibrium.
Conclusion: These findings showed an association between the PTPN22 rs2476601 polymorphism and pediatric lupus nephritis due to its overtransmission in the group of families studied.

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  • Gloria Garavito División Ciencias de la Salud, Grupo de Investigación en Inmunología y Biología Molecular, Universidad del Norte, Barranquilla, Colombia
  • Eduardo Egea División Ciencias de la Salud, Grupo de Investigación en Inmunología y Biología Molecular, Universidad del Norte, Barranquilla, Colombia
  • Luis Fang Corporación Universitaria Rafael Núñez, Universidad de Cartagena, Cartagena, Colombia
  • Clara Malagón Ciencias de la Salud, Universidad El Bosque, Bogotá, D.C., Colombia
  • Carlos Olmos Ciencias de la Salud, Universidad del Rosario, Bogotá, D.C., Colombia
  • Luz González Ciencias de la Salud, Universidad El Bosque, Bogotá, D.C., Colombia
  • Pilar Guarnizo Ciencias de la Salud, Universidad del Rosario, Bogotá, D.C., Colombia
  • Gustavo Aroca Ciencias de la Salud, Grupo de Investigación Nefrología, Universidad Simón Bolívar, Barranquilla, Colombia
  • Guillermo López Departamento de Fisiología, Anatomía y Biología Celular, Centro Andaluz de Biología del Desarrollo, Grupo de Investigación en Biología Celular y Biotecnología, Universidad Pablo de Olavide, Sevilla, España
  • Antonio Iglesias Ciencias de la Salud, Grupo Unidad de Reumatología, Universidad Nacional de Colombia, Bogotá, D.C., Colombia

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How to Cite
1.
Garavito G, Egea E, Fang L, Malagón C, Olmos C, González L, et al. Association of polymorphic variants of PTPN22, TNF and VDR genes in children with lupus nephritis: A study in Colombian family triads. biomedica [Internet]. 2017 Jun. 1 [cited 2024 May 18];37(2):260-6. Available from: https://revistabiomedica.org/index.php/biomedica/article/view/3247

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Published
2017-06-01
Section
Short communication

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