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Extended major histocompatibility complex haplotypes, ancestry and acute kidney transplant rejection in Mexicans
(2011-07)
Riquelme Mc Loughlin, M. Constanza
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Granados, Julio
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Acuña-Alonzo, Víctor
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Telich, Eduardo
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Mancilla-Urrea, Eduardo
Introduction. Extended major histocompatibility complex (MHC) haplotypes are associated with several autoimmune diseases, and these appear to depend on ancestry. Objective. To evaluate the association of extended MHC gene frequencies, ancestry, and acute rejection. Material and methods. 127 living kidney transplant recipients who underwent kidney transplantation in Mexico City between January 2004 and October 2007 with follow up until October 2008. The primary outcome was biopsy proven acute rejection. Ancestry was considered as either Amerindian or admixtures with Caucasian, African or Oriental genes. Allele and haplotype frequencies were estimated for HLA A, B and DR loci. Hardy Weinberg (HW) and delta values were analyzed to test for linkage disequilibrium (LD).© Revista de Investigación Clínica
Scopus© Citations 2 36 2
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Molecular demonstration of SLC4A1 gene deletion in two Mexican patients with Southeast Asian ovalocytosis
(2005-06)
Carrillo Farga, Joaquín
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Zúñiga, Joaquín
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Amador Guerrero, María Teresa
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Granados, Julio
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Estrada Mena, Francisco Javier
We describe the finding of two Mexican patients with a specific 27-bp deletion in the solute carrier family 4 gene (SLC4A1delta27) (also known as the band 3 gene found on chromosome 17q21-q22), characteristic of Southeast Asian ovalocytosis (SAO). The patients were asymptomatic, and the initial diagnosis was made by microscopic observation of the presence of typical stomatocytic ovalocytes. The gene deletion was confirmed by PCR and DNA sequencing. Both patients were heterozygous for the deletion. One patient is from Tabasco state, in southeastern Mexico, a malaria-endemic zone. The other patient is from Mexico City, which is not a malaria-endemic area. Their families have no non-Mexican ancestors and their previous generations were born in Mexico. Both patients carry the HLA-B*3501 subtype, characteristic of Amerindians and Asian populations. Familial and HLA data led us to conclude that these two patients are the first report of SLC4A1delta27 in Amerindians. The nucleotide analysis showing a perfect match sequence between Southeast Asian and Mexican patients suggests, but does not prove, that the Mexican gene is not a de novo mutation. Instead, this gene might be the result of migration of individuals with Asian ancestry into the Mexican gene pool. We are looking for other families with the mutation to detect, by HLA analysis, the ancient ethnic origin of these patients. ©Human Biology
Scopus© Citations 3 34 2
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DNA sequencing of HLA-B alleles in Mexican patients with Takayasu arteritis
(2000)
Vargas Alarcón, Gilberto
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Zúñiga, Joaquín
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Gamboa, Ricardo
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Hernández-Pacheco, Guadalupe
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Hesiquio, Ramiro
Takayasu arteritis (TA) is characterized by a ‘pulseless’ condition and occurs frequently in young females from Asian and South American countries. It has been associated with Mayor Histocompatibility Complex (MHC) genes in different populations. Recent data indicate direct participation of HLA-B alleles in the susceptibility to the disease. This fact was explored in an associative study with TA to establish if some region in the exon 2, intron 2 or in the exon 3 of HLA-B alleles is common in the alleles associated with TA and at the same time to know if a specific sequence or an epitope, more than an allele, would be responsible for the susceptibility to this vasculitis. We studied HLA-B alleles of 12 Mexican patients with TA using PCR-SSP and sequencing. The analysis by PCR-SSP in 12 patients showed that five of them showed the B*15 allele, three the B*40 allele and two the B*39 allele, the remaining two presented the B*44 allele. Sequence analysis enabled us to define that the B*39 subtypes are B*3908; B*15 subtypes are B*1510, B*1515, B*1522 and B*1531; and the B*40 subtypes are B*4005 and B*4008. An individual with B*51 (B*5107) and another with B*52 (B*5201) alleles were also identified. The sequences of the intron 2 seem be heterogeneous. Analysis at the 63 and 67 positions of HLA-B alleles showed that 9 of them have similarity in some of these positions with the residues detected in the B*5201 and B*3902 alleles associated with TA in Asian populations. The results indicate that there is heterogeneity in the alleles associated with TA in Mexicans but, in spite of that heterogeneity, the alleles associates can be separated into three groups: B*39, B*15 and B*40, whose subtypes are rare and apparently of recent generation in Mexico, probably by recombination events at intron 2 level. The sequences analysis also shows that most of the alleles detected in the Mexican patients share two epitopes described in the susceptibility alleles in Asian populations, suggesting that these epitopes could be responsible for the susceptibility to develop the disease in spite of the allele in which are found. ©International Journal of Cardiology
Scopus© Citations 31 18 2
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HLA-DR alleles associated with skin warts induced by human papillomavirus infection
(2010)
García Corona, Cristina
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Vega-Memije, Ma. Elisa
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Barquera, Rodrigo
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Granados, Julio
Background The skin wart is a benign proliferation of the skin and mucous, secondary to human papillomavirus (HPV) infection. Objectives The objective of this study is to determine gene frequencies of HLA-DR alleles in Mexican patients with skin warts and compare them with those present in ethnically matched healthy subjects. Methods Fifty-two patients with clinically and histologically confirmed skin warts from the Dermatology Outpatient Clinic, with results of high-resolution DNA typing for HLA-DR polymorphism.
Scopus© Citations 5 10 2
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Blood group O alleles in Native Americans: Implications in the peopling of the Americas
(2009)
Estrada-Mena, Benito
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Estrada Mena, Francisco Javier
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Ulloa-Arvizu, Raúl
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Guido, Miriam
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Méndez, Rocío
All major ABO blood alleles are found in most populations worldwide, whereas the majority of Native Americans are nearly exclusively in the O group. O allele molecular characterization could aid in elucidating the possible causes of group O predominance in Native American populations. In this work, we studied exon 6 and 7 sequence diversity in 180 O blood group individuals from four different Mesoamerican populations. Additionally, a comparative analysis of genetic diversity and population structure including South American populations was performed. Results revealed no significant differences among Mesoamerican and South American groups, but showed significant differences within population groups attributable to previously detected differences in genetic drift and founder effects throughout the American continent. Interestingly, in all American populations, the same set of haplotypes O1, O1v, and O1v(G542A) was present, suggesting the following: (1) that they constitute the main genetic pool of the founding population of the Americas and (2) that they derive from the same ancestral source, partially supporting the single founding population hypothesis. In addition, the consistent and restricted presence of the G542A mutation in Native Americans compared to worldwide populations allows it to be employed as an Ancestry informative marker (AIM). Present knowledge of the peopling of the Americas allows the prediction of the way in which the G542A mutation could have emerged in Beringia, probably during the differentiation process of Asian lineages that gave rise to the founding population of the continent. Am J Phys Anthropol, 2010. © 2009 Wiley-Liss, Inc.
Scopus© Citations 22 13 1
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Human leukocyte antigens class II genes are associated with cancer development in the autoimmune rheumatic diseases
(2011)
Miranda-Duarte, Antonio
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Kraus-Weisman, Arnoldo
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Granados, Julio
Objective. To t vb determine the association between HLA class II alleles and the probability of developing cancer in patients with autoimmune rheumatic diseases. Material and methods. A a r . matched case control study was conducted in which patients with autoimmune rheumatic disease who later developed malignancy (solid or lymphoproliferative) were compared with matched controls suffering from the same auto-immune rheumatic disease and with similar disease duration. The rheumatic diseases included rheumatoid arthritis, systemic lupus erythematosus, primary Sjögren syndrome, dermatomyositis-polymyositis, and systemic sclerosis. HLA-DR typing was performed by sequence-specific primers after DNA amplification by PCR (PCR-SSP). Statistical analysis was conducted by conditional logistic regression.
5 2
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Clinical, Histological and Molecular Characteristics of Mexican Patients with Fabry Disease and Significant Renal Involvement
(2014)
Olvera, David
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Morales, Juan
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Rodriguez-Espino, Benjamin A.
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Lara-Mejía, Alejandra
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De Los Ríos, Diana
Background and aims: Fabry's disease (FD) is an X-linked lysosomal disorder caused by a deficiency of the enzyme α-galactosidase A that produces accumulation of glycosphingolipids with clinical abnormalities of skin, eye, kidney, heart, brain, and peripheral nervous system. We undertook this study to describe the molecular characteristics of the first four Mexican patients with diagnosis of FD with significant renal involvement, correlating these molecular characteristics with clinical, pathological and biochemical findings. Methods: Genomic DNA from Mexican nonrelated patients with presumptive diagnosis of FD was sequenced by polymerase chain reaction (PCR). DNA sequences were compared against sequences in world data bank gene for alpha-galactosidase A (α-GLA, ENSG00000102393) using the BLAST database. Copyright © 2014 IMSS. Published by Elsevier Inc. All rights reserved.
Scopus© Citations 5 16 1
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Prevalent HLA Class II Alleles in Mexico City Appear to Confer Resistance to the Development of Amebic Liver Abscess
(2015)
Hernández, Eric G.
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Granados, Julio
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Partida-Rodríguez, Oswaldo
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Valenzuela, Olivia
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Rascón, Edgar
Amebiasis is an endemic disease and a public health problem throughout Mexico, although the incidence rates of amebic liver abscess (ALA) vary among the geographic regions of the country. Notably, incidence rates are high in the northwestern states (especially Sonora with a rate of 12.57/100,000 inhabitants) compared with the central region (Mexico City with a rate of 0.69/100,000 inhabitants). These data may be related to host genetic factors that are partially responsible for resistance or susceptibility. Therefore, we studied the association of the HLA-DRB1 and HLA-DQB1 alleles with resistance or susceptibility to ALA in two Mexican populations, one each from Mexico City and Sonora. Ninety ALA patients were clinically diagnosed by serology and sonography. Genomic DNA was extracted from peripheral blood mononuclear cells. To establish the genetic identity of both populations, 15 short tandem repeats (STRs) were analyzed with multiplexed PCR, and the allelic frequencies of HLA were studied by PCR-SSO using LUMINEX technology. The allele frequencies obtained were compared to an ethnically matched healthy control group (146 individuals). We observed that both affected populations differed genetically from the control group. We also found interesting trends in the population from Mexico City. HLA-DQB1*02 allele frequencies were higher in ALA patients compared to the control group (0.127 vs 0.047; p= 0.01; pc= NS; OR= 2.9, 95% CI= 1.09-8.3). The less frequent alleles in ALA patients were HLA-DRB1*08 (0.118 vs 0.238 in controls; p= 0.01; pc= NS; OR= 0.42, 95% CI= 0.19-0.87) and HLA-DQB1*04 (0.109 vs 0.214; p= 0.02; pc= NS; OR= 0.40, 95% CI= 0.20-0.94). The haplotype HLA-DRB1*08/-DQB1*04 also demonstrated a protective trend against the development of this disease (0.081 vs. 0.178; p=0.02; pc=NS; OR= 0.40, 95% CI= 0.16-0.93). These trends suggest that the prevalent alleles in the population of Mexico City may be associated with protection against the development of ALA. ©PLOS ONE
Scopus© Citations 11 30 1

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