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An original Eurasian haplotype, HLA-DRB1*14:54-DQB1*05:03, influences the susceptibility to idiopathic achalasia

2018; Public Library of Science; Volume: 13; Issue: 8 Linguagem: Inglês

10.1371/journal.pone.0201676

1932-6203

Janette Furuzawa‐Carballeda, Joaquı́n Zúñiga, Diana Iraíz Hernández-Zaragoza, Rodrigo Barquera, Eduardo Marques-García, Luis Jiménez-Álvarez, Alfredo Cruz‐Lagunas, Gustavo Ramírez, Nora E. Regino-Zamarripa, Ramón Espinosa-Soto, Edmond J. Yunis, Fernanda Romero‐Hernández, Daniel Azamar‐Llamas, Enrique Coss‐Adame, Miguel A. Valdovinos, Samuel Torres‐Landa, Axel Palacios-Ramírez, Blanca A. Blancas Breña, Edgar Alejandro‐Medrano, Axel A. Hernández-Ávila, Julio Granados, Gonzalo Torres‐Villalobos,

Helicobacter pylori-related gastroenterology studies

Idiopathic achalasia is a relatively infrequent esophageal motor disorder for which major histocompatibility complex (MHC) genes are well-identified risk factors. However, no information about HLA-achalasia susceptibility in Mexicans has previously been reported. We studied a group of 91 patients diagnosed with achalasia and 234 healthy controls with Mexican admixed ancestry. HLA alleles and conserved extended haplotypes were analyzed using high-resolution HLA typing based on Sanger and next-generation sequencing technologies. Admixture estimates were determined using HLA-B and short tandem repeats. Results were analyzed by non-parametric statistical analysis and Bonferroni correction. P-values < 0.05 were considered significant. Patients with achalasia had 56.7% Native American genes, 24.7% European genes, 16.5% African genes and 2.0% Asian genes, which was comparable with the estimates in the controls. Significant increases in the frequencies of alleles DRB1*14:54 and DQB1*05:03 and the extended haplotypes DRB1*14:54-DQB1*05:03 and DRB1*11:01-DQB1*03:01, even after Bonferroni correction (pC<0.05), were found in the achalasia group compared to those in the controls. Concluding, the HLA class II alleles HLA-DRB1*14:54:01 and DQB1*05:03:01 and the extended haplotype are risk factors for achalasia in mixed-ancestry Mexican individuals. These results also suggest that the HLA-DRB1*14:54-DQB1*05:03 haplotype was introduced by admixture with European and/or Asian populations.