Abstract
Introduction/objectives
Familial Mediterranean Fever (FMF) is a genetic disorder of the innate immunity characterized by chronic inflammatory state. The diagnosis is mainly based on clinical criteria and supported by genotyping, especially in atypical phenotypes. The primary objective was to depict the Familial Mediterranean Fever (FMF) genotype of Greek patients and investigate the contribution of Next Generation Sequencing (NGS) beyond the contemporary techniques [(Polymerase Chain Reaction (PCR)/hybridization and Non-Isotopic RNase Cleavage Assay (NIRCA). The secondary objective was to unravel any associations between the mutated genes with the disease course and response to treatment.
Methods
In this single center, retrospective study 31 patients with clinical diagnosis with FMF, but non-conclusive genetic analysis with PCR/hybridization and NIRCA, underwent NGS genotyping.
Results
PCR/NIRCA detected ≥ 1 mutation in 25/31 patients, most frequently M694V (29%), while NGS in 26/31 (83.9%), most frequently R202Q (61.3%). NGS genetically confirmed the clinical diagnosis (heterozygosity to compound or complex genotype) in 19 (61.3%) patients of our cohort. R202Q was significantly more prevalent by NGS than by contemporary techniques (61.3 vs 12.9%, p = 0.0002) and was associated with FMF. Rare mutations were detected by NGS in 19.2% patients.
Conclusion
NGS clarifies the genetic profile of patients with atypical phenotypes and supports therapeutic management decisions. NGS unveiled the frequent involvement of R202Q in the pathogenesis of our FMF patients.
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Data availability
All data relevant to the study are included in the article. Additional information will be provided upon request.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by VS, MT and EF. The first draft of the manuscript was written by VS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Sgouropoulou, V., Farmaki, E., Papadopoulos, T. et al. Sequence analysis in Familial Mediterranean Fever patients with no confirmatory genotype. Rheumatol Int 42, 15–22 (2022). https://doi.org/10.1007/s00296-021-04913-4
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DOI: https://doi.org/10.1007/s00296-021-04913-4