Classical HLA alleles tag SNP in families from Antioquia with type 1 diabetes mellitus

Diana Clobeth Sarrazola, Alejandra Marcela Rodríguez, Martín Toro, Alejandra Vélez, Jorge García-Ramírez, María Victoria Lopera, Cristiam M. Álvarez, Vital Balthazar González †, Juan Manuel Alfaro, Nicolás Pineda-Trujillo, .

Keywords: Diabetes mellitus, type 1, major histocompatibility complex, linkage disequilibrium, autoimmune diseases

Abstract

Introduction: The HLA region strongly associates with autoimmune diseases, such as type 1 diabetes. An alternative way to test classical HLA alleles is by using tag SNP. A set of tag SNP for several classical HLA alleles has been reported as associated with susceptibility or resistance to this disease in Europeans.
Objective: We aimed at validating the methodology based on tag SNP focused on the inference of classical HLA alleles, and at evaluating their association with type 1 diabetes mellitus in a sample of 200 families from Antioquia.
Materials and methods: We studied a sample of 200 families from Antioquia. Each family had one or two children with T1D. We genotyped 13 SNPs using tetra-primer ARMS-PCR or PCRRFLP. In addition, we tested the validity of the tag SNP reported for Europeans in 60 individuals from a population of Colombians living in Medellín (CLM) from the 1000 Genomes Project database. Statistical analyses included the Hardy-Weinberg equilibrium, the transmission disequilibrium and the linkage disequilibrium tests.
Results: The linkage disequilibrium was low in reported tag SNP and classical HLA alleles in this CLM population. Association analyses revealed both risk and protection factors to develop type 1 diabetes mellitus. Appropriate tag SNPs for the CLM population were determined by using the genotype information available in the 1000 Genome Project database.
Conclusions: Although linkage disequilibrium patterns in this CLM population were different from those reported in Europeans, we did find strong evidence of the role of HLA in the development of type 1 diabetes mellitus in the study population.

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  • Diana Clobeth Sarrazola Grupo de Mapeo Genético, Departamento de Pediatría, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
  • Alejandra Marcela Rodríguez Grupo de Mapeo Genético, Departamento de Pediatría, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
  • Martín Toro IPS Universitaria, Universidad de Antioquia, Medellín, Colombia
  • Alejandra Vélez Pontificia Universidad Bolivariana, Medellín, Colombia
  • Jorge García-Ramírez Instituto Antioqueño de Diabetes, Medellín, Colombia
  • María Victoria Lopera IPS Universitaria, Universidad de Antioquia, Medellín, Colombia
  • Cristiam M. Álvarez Grupo de Inmunología Celular e Imunogenética, GICIC, Universidad de Antioquia, Medellín, Colombia
  • Vital Balthazar González † Grupo de Mapeo Genético, Departamento de Pediatría, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia Sección de Endocrinología Pediátrica, Departamento de Pediatría, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
  • Juan Manuel Alfaro Grupo de Mapeo Genético, Departamento de Pediatría, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia Sección de Endocrinología Pediátrica, Departamento de Pediatría, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
  • Nicolás Pineda-Trujillo Grupo de Mapeo Genético, Departamento de Pediatría, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia

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How to Cite
1.
Sarrazola DC, Rodríguez AM, Toro M, Vélez A, García-Ramírez J, Lopera MV, et al. Classical HLA alleles tag SNP in families from Antioquia with type 1 diabetes mellitus. biomedica [Internet]. 2018 Sep. 1 [cited 2024 May 16];38(3):329-37. Available from: https://revistabiomedica.org/index.php/biomedica/article/view/3768

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Published
2018-09-01
Section
Original articles

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