Variant in ERAP1 promoter region is associated with low expression in a patient with a Behçet-like MHC-I-opathy
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Variant in ERAP1 promoter region is associated with low expression in a patient with a Behçet-like MHC-I-opathy. / Dimopoulou, Chrysoula; Lundgren, Jens D.; Sundal, Jon; Ullum, Henrik; Aukrust, Pål; Nielsen, Finn C.; Marvig, Rasmus L.
I: Journal of Human Genetics, Bind 65, Nr. 3, 2020, s. 325-335.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Variant in ERAP1 promoter region is associated with low expression in a patient with a Behçet-like MHC-I-opathy
AU - Dimopoulou, Chrysoula
AU - Lundgren, Jens D.
AU - Sundal, Jon
AU - Ullum, Henrik
AU - Aukrust, Pål
AU - Nielsen, Finn C.
AU - Marvig, Rasmus L.
PY - 2020
Y1 - 2020
N2 - Behçet disease (BD) is an immune-mediated disease. The cause of BD remains unknown, but the existence of multiple pathological pathways is suspected, including different genetic factors. Polymorphisms in ERAP1 gene have been associated with an increased risk of BD. However, while current BD-associated ERAP1 variants are suggested to contribute to disease by altering the activity of the encoded protein, there is no knowledge of variants that alter the expression level of ERAP1, despite previous associations between ERAP1 expression and BD. Here, we used whole-exome sequencing of a patient with a Behçet-like MHC-I-opathy to identify that the patient, unlike its healthy parents, was homozygous for a rare 1-bp deletion, rs140416843, in the promoter region of ERAP1. rs140416843 has not previously been associated with disease, but is linked to ERAP1 haplotype Hap10 which is associated with BD. The expression of ERAP1 by both RT-qPCR and RNA sequencing showed that ERAP1 mRNA expression correlated with the zygosity for the identified deletion and was decreased in comparison to a healthy cohort. In conclusion, we diagnosed the patient as having BD, and hypothesize that rs140416843-mediated changes in ERAP1 expression play a causative role in BD and that this risk factor is contributing to the association between Hap10 and BD. This is the first report to identify a variant that may cause BD by altering the expression of ERAP1, and our findings suggest that downregulation of ERAP1 expression can serve as a diagnostic marker for BD.
AB - Behçet disease (BD) is an immune-mediated disease. The cause of BD remains unknown, but the existence of multiple pathological pathways is suspected, including different genetic factors. Polymorphisms in ERAP1 gene have been associated with an increased risk of BD. However, while current BD-associated ERAP1 variants are suggested to contribute to disease by altering the activity of the encoded protein, there is no knowledge of variants that alter the expression level of ERAP1, despite previous associations between ERAP1 expression and BD. Here, we used whole-exome sequencing of a patient with a Behçet-like MHC-I-opathy to identify that the patient, unlike its healthy parents, was homozygous for a rare 1-bp deletion, rs140416843, in the promoter region of ERAP1. rs140416843 has not previously been associated with disease, but is linked to ERAP1 haplotype Hap10 which is associated with BD. The expression of ERAP1 by both RT-qPCR and RNA sequencing showed that ERAP1 mRNA expression correlated with the zygosity for the identified deletion and was decreased in comparison to a healthy cohort. In conclusion, we diagnosed the patient as having BD, and hypothesize that rs140416843-mediated changes in ERAP1 expression play a causative role in BD and that this risk factor is contributing to the association between Hap10 and BD. This is the first report to identify a variant that may cause BD by altering the expression of ERAP1, and our findings suggest that downregulation of ERAP1 expression can serve as a diagnostic marker for BD.
U2 - 10.1038/s10038-019-0709-y
DO - 10.1038/s10038-019-0709-y
M3 - Journal article
C2 - 31873220
AN - SCOPUS:85077152393
VL - 65
SP - 325
EP - 335
JO - Journal of Human Genetics
JF - Journal of Human Genetics
SN - 1434-5161
IS - 3
ER -
ID: 235772593