PMID- 37416040 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20230718 IS - 2168-8184 (Print) IS - 2168-8184 (Electronic) IS - 2168-8184 (Linking) VI - 15 IP - 6 DP - 2023 Jun TI - Bullous Pemphigoid and Human Leukocyte Antigen (HLA)-DQA1: A Systematic Review. PG - e39923 LID - 10.7759/cureus.39923 [doi] LID - e39923 AB - Bullous pemphigoid (BP) is an autoimmune blistering disease that mainly affects the elderly. The human leukocyte antigen (HLA) system is believed to be one of the genetic factors involved in the development of BP. The connection between major histocompatibility complex class II, specifically HLA-DQA1, and BP remains inconclusive. The objective of this review is to find potential associations between BP and HLA-DQA1 alleles, identify the HLA-DQA1 alleles associated with an increased or decreased risk of developing BP, and highlight literature gaps for future research. The Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines were used to conduct a literature review. Databases used included PubMed/MEDLINE, Google Scholar, Embase, and Cochrane Library. Only studies written in English and conducted after 2000 that investigated the association between HLA-DQA1 and BP in human subjects were included. Odds ratios were calculated from the data provided in the studies, and a meta-analysis was conducted using Review Manager (The Cochrane Collaboration, London, United Kingdom) and MetaXL (EpiGear International Pty Ltd., Queensland, Australia) software. The systematic review found five eligible studies, and all were included in the meta-analysis. Results show an increased odds for BP in the HLA-DQA1*05:05 loci (odds ratio (OR) = 2.25; 95% confidence interval (CI) = 1.80, 2.80) and decreased odds for BP in the HLA-DQA1*02:01 loci (OR = 0.50; 95% CI = 0.36, 0.70). Further research is needed to confirm these findings and explore the potential clinical implications for personalized medicine approaches in BP patients. CI - Copyright (c) 2023, Hesari et al. FAU - Hesari, Roksana AU - Hesari R AD - Osteopathic Medicine, Lake Erie College of Osteopathic Medicine, Bradenton, USA. FAU - Thibaut, Dylan AU - Thibaut D AD - Osteopathic Medicine, Lake Erie College of Osteopathic Medicine, Bradenton, USA. FAU - Schur, Nina AU - Schur N AD - Osteopathic Medicine, Lake Erie College of Osteopathic Medicine, Bradenton, USA. FAU - Thoutireddy, Shivani AU - Thoutireddy S AD - Osteopathic Medicine, Lake Erie College of Osteopathic Medicine, Bradenton, USA. FAU - Witcher, Ryan AU - Witcher R AD - Osteopathic Medicine, Lake Erie College of Osteopathic Medicine, Bradenton, USA. FAU - Julian, Elyse AU - Julian E AD - Dermatology, Leading Edge Dermatology, Plantation, USA. LA - eng PT - Journal Article PT - Review DEP - 20230603 PL - United States TA - Cureus JT - Cureus JID - 101596737 PMC - PMC10319936 OTO - NOTNLM OT - allele OT - bullous pemphigoid OT - dqa1 OT - hla OT - hla-dqa1 OT - human leukocyte antigen OT - meta-analysis OT - mhc OT - mhc class ii OT - systematic review COIS- The authors have declared that no competing interests exist. EDAT- 2023/07/07 06:42 MHDA- 2023/07/07 06:43 PMCR- 2023/06/03 CRDT- 2023/07/07 04:02 PHST- 2023/05/11 00:00 [received] PHST- 2023/06/03 00:00 [accepted] PHST- 2023/07/07 06:43 [medline] PHST- 2023/07/07 06:42 [pubmed] PHST- 2023/07/07 04:02 [entrez] PHST- 2023/06/03 00:00 [pmc-release] AID - 10.7759/cureus.39923 [doi] PST - epublish SO - Cureus. 2023 Jun 3;15(6):e39923. doi: 10.7759/cureus.39923. eCollection 2023 Jun.