PMID- 20542071 OWN - NLM STAT- MEDLINE DCOM- 20110131 LR - 20111117 IS - 1879-1166 (Electronic) IS - 0198-8859 (Linking) VI - 71 IP - 9 DP - 2010 Sep TI - MSH5 is not a genetic predisposing factor for immunoglobulin A deficiency but marks the HLA-DRB1*0102 subgroup carrying susceptibility. PG - 861-4 LID - 10.1016/j.humimm.2010.06.007 [doi] AB - The etiology of selective IgA deficiency (IgAD) is clearly influenced by human leukocyte antigen (HLA) genetic composition, although the susceptibility observed has not been ascribed to any specific gene/s. A possible role of the MSH5 gene, mapping on this chromosomal region, has been proposed based on its function and on the association of some MSH5 polymorphisms (L85F/P786S and rs3131378) with the disease. However, the extensive linkage disequilibrium in the HLA region makes mandatory additional analyses. We aimed at evaluating the role of those MSH5 polymorphisms on IgAD susceptibility considering their linkage with other classically associated HLA markers, specifically DRB1*0102 and B*08-DRB1*03. We studied 146 trios composed by IgAD patient and parents to unambiguously establish the gametic phase. Association of those MSH5 variants with IgAD is observed but stratified analyses considering other HLA alleles rule out the role of MSH5 per se as a predisposing factor. However, the minor allele of one of the studied polymorphisms, 85F, defines the subgroup of DRB1*0102 haplotypes carrying susceptibility. The causal factor present on this haplotype (MSH5 85F-DRB1*0102) seems to be at the telomeric end of HLA class II or in Class I or III, as the allele composition in more centromeric markers is shared by all the haplotypes containing DRB1*0102. CI - Copyright 2010 American Society for Histocompatibility and Immunogenetics. Published by Elsevier Inc. All rights reserved. FAU - Pozo, Nadia Del AU - Pozo ND AD - Clinical Immunology Department, Hospital Clinico, San Carlos, Madrid, Spain. FAU - Medrano, Luz Maria AU - Medrano LM FAU - Cenit, M Carmen AU - Cenit MC FAU - Fernandez-Arquero, Miguel AU - Fernandez-Arquero M FAU - Ferreira, Antonio AU - Ferreira A FAU - Garcia-Rodriguez, Mari Cruz AU - Garcia-Rodriguez MC FAU - de la Concha, Emilio G AU - de la Concha EG FAU - Urcelay, Elena AU - Urcelay E FAU - Nunez, Concepcion AU - Nunez C LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20100611 PL - United States TA - Hum Immunol JT - Human immunology JID - 8010936 RN - 0 (Cell Cycle Proteins) RN - 0 (HLA-B Antigens) RN - 0 (HLA-DQ Antigens) RN - 0 (HLA-DQ alpha-Chains) RN - 0 (HLA-DQ beta-Chains) RN - 0 (HLA-DQA1 antigen) RN - 0 (HLA-DQB1 antigen) RN - 0 (HLA-DR Antigens) RN - 0 (HLA-DRB1 Chains) RN - 0 (HLA-DRB1*01:02 antigen) RN - 0 (MSH5 protein, human) SB - IM MH - Alleles MH - Cell Cycle Proteins/*genetics MH - Genetic Predisposition to Disease/*genetics MH - HLA-B Antigens/genetics MH - HLA-DQ Antigens/genetics MH - HLA-DQ alpha-Chains MH - HLA-DQ beta-Chains MH - HLA-DR Antigens/*genetics MH - HLA-DRB1 Chains MH - Haplotypes/genetics MH - Humans MH - IgA Deficiency/*genetics MH - Linkage Disequilibrium/genetics MH - Microsatellite Repeats/genetics MH - Parents MH - Polymorphism, Genetic/genetics/immunology EDAT- 2010/06/15 06:00 MHDA- 2011/02/01 06:00 CRDT- 2010/06/15 06:00 PHST- 2010/02/27 00:00 [received] PHST- 2010/06/01 00:00 [revised] PHST- 2010/06/04 00:00 [accepted] PHST- 2010/06/15 06:00 [entrez] PHST- 2010/06/15 06:00 [pubmed] PHST- 2011/02/01 06:00 [medline] AID - S0198-8859(10)00150-3 [pii] AID - 10.1016/j.humimm.2010.06.007 [doi] PST - ppublish SO - Hum Immunol. 2010 Sep;71(9):861-4. doi: 10.1016/j.humimm.2010.06.007. Epub 2010 Jun 11.