Abstract
Hereditary angioedema (HAE) is a potentially life-threatening autosomal dominant disorder affecting roughly 1:50,000 individuals. It is commonly characterized by swelling of the larynx, gastrointestinal tract, extremities, and skin. There is growing genetic heterogeneity associated with this disease but more than 95% of mutations are found in SERPING1, the gene which encodes complement 1 inhibitor (C1-INH). HAE cohorts from several populations have been published but no large scale study has been reported from the Arab world to date. Here we document the clinical and genetic findings of HAE patients from a single Saudi institution, which is a major referral center at the national level. A total of 51 patients across 17 unrelated families were recruited including two large multi-generational families, of which one contained an in-frame exonic deletion that was resolved through MLPA. Two cases were negative for all the genes we tested (including F12, PLG, ANGPT1, MYOF, KNG1, and HS3ST6). The predominant HAE subtype in our cohort was type I, at 76%. We were able to uncover a mutation in 49 patients (96%). No type III (normal C1-INH) patients were encountered in the clinic, suggesting that this subtype does not play a major role in HAE pathogenesis in Saudi Arabia. Additionally, the existence of four patients with consistently normal complement 4 (C4) levels alongside abnormal C1-INH profiles highlights the utility of dual screening for both proteins in suspected patients.
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Acknowledgements
We thank all our patients and their family members for their gracious and enthusiastic participation. We are also grateful to Salma M Wakil, Dorota Monies, and to all members of the sequencing and genomics core facilities at the Centre for Genomic Medicine, KFSH&RC for their invaluable assistance. We also thank Qasim A Sheikh for his help with data analysis and Samer Alkhateeb for his generous support with logistics.
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FS and AA designed the study, analyzed the data, and prepared the manuscript; FA and SA tabulated the clinical data and prepared the manuscript; HuA and HiA performed the experiments and assisted in the data analysis; FS, MA, FA, RA, SS, HaA, BA-S, HA-D, NS, and SA cared for patients and contributed the clinical data; SAA and HA-M coordinated and documented patient recruitment and data; MA participated in manuscript writing; MHA-H conducted experiments and assisted in manuscript preparation.
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All research involving patient materials was approved by the King Faisal Specialist Hospital & Research Centre (Riyadh) institutional review board, RAC # 2080 025.
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Sheikh, F., Alajlan, H., Albanyan, M. et al. Phenotypic and Genotypic Characterization of Hereditary Angioedema in Saudi Arabia. J Clin Immunol 43, 479–484 (2023). https://doi.org/10.1007/s10875-022-01399-y
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DOI: https://doi.org/10.1007/s10875-022-01399-y