1. Genome-wide association study in frontal fibrosing alopecia identifies four susceptibility loci including HLA-B*07:02.
- Author
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Tziotzios C, Petridis C, Dand N, Ainali C, Saklatvala JR, Pullabhatla V, Onoufriadis A, Pramanik R, Baudry D, Lee SH, Wood K, Liu L, Seegobin S, Michelotti GA, Lwin SM, Christou EAA, Curtis CJ, de Rinaldis E, Saxena A, Holmes S, Harries M, Palamaras I, Cunningham F, Parkins G, Kaur M, Farrant P, McDonagh A, Messenger A, Jones J, Jolliffe V, Ali I, Ardern-Jones M, Mitchell C, Burrows N, Atkar R, Banfield C, Alexandroff A, Champagne C, Cooper HL, Vañó-Galván S, Molina-Ruiz AM, Perez NO, Patel GK, Macbeth A, Page M, Bryden A, Mowbray M, Wahie S, Armstrong K, Cooke N, Goodfield M, Man I, de Berker D, Dunnill G, Takwale A, Rao A, Siah TW, Sinclair R, Wade MS, Dlova NC, Setterfield J, Lewis F, Bhargava K, Kirkpatrick N, Estivill X, Stefanato CM, Flohr C, Spector T, Watt FM, Smith CH, Barker JN, Fenton DA, Simpson MA, and McGrath JA
- Subjects
- Adaptive Immunity, Alopecia diagnosis, Alopecia genetics, Alopecia physiopathology, Case-Control Studies, Cohort Studies, Cytochrome P-450 CYP1B1 genetics, Cytochrome P-450 CYP1B1 immunology, Female, Gene Expression, Genome, Human, Genome-Wide Association Study, HLA-B7 Antigen immunology, Humans, Immunity, Innate, Polymorphism, Single Nucleotide, Alopecia congenital, Genetic Loci, Genetic Predisposition to Disease, HLA-B7 Antigen genetics, Transcriptome immunology
- Abstract
Frontal fibrosing alopecia (FFA) is a recently described inflammatory and scarring type of hair loss affecting almost exclusively women. Despite a dramatic recent increase in incidence the aetiopathogenesis of FFA remains unknown. We undertake genome-wide association studies in females from a UK cohort, comprising 844 cases and 3,760 controls, a Spanish cohort of 172 cases and 385 controls, and perform statistical meta-analysis. We observe genome-wide significant association with FFA at four genomic loci: 2p22.2, 6p21.1, 8q24.22 and 15q2.1. Within the 6p21.1 locus, fine-mapping indicates that the association is driven by the HLA-B*07:02 allele. At 2p22.1, we implicate a putative causal missense variant in CYP1B1, encoding the homonymous xenobiotic- and hormone-processing enzyme. Transcriptomic analysis of affected scalp tissue highlights overrepresentation of transcripts encoding components of innate and adaptive immune response pathways. These findings provide insight into disease pathogenesis and characterise FFA as a genetically predisposed immuno-inflammatory disorder driven by HLA-B*07:02.
- Published
- 2019
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