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A novel two-score system for interferon status segregates autoimmune diseases and
correlates with clinical features
#MMPMID29643425
El-Sherbiny YM
; Psarras A
; Md Yusof MY
; Hensor EMA
; Tooze R
; Doody G
; Mohamed AAA
; McGonagle D
; Wittmann M
; Emery P
; Vital EM
Sci Rep
2018[Apr]; 8
(1
): 5793
PMID29643425
show ga
Measurement of type I interferon (IFN-I) has potential to diagnose and stratify
autoimmune diseases, but existing results have been inconsistent.
Interferon-stimulated-gene (ISG) based methods may be affected by the modularity
of the ISG transcriptome, cell-specific expression, response to IFN-subtypes and
bimodality of expression. We developed and clinically validated a 2-score system
(IFN-Score-A and -B) using Factor Analysis of 31 ISGs measured by TaqMan selected
from 3-IFN-annotated modules. We evaluated these scores using in-vitro IFN
stimulation as well as in sorted cells then clinically validated in a cohort of
328 autoimmune disease patients and healthy controls. ISGs varied in response to
IFN-subtypes and both scores varied between cell subsets. IFN-Score-A
differentiated Systemic Lupus Erythematosus (SLE) from both Rheumatoid Arthritis
(RA) and Healthy Controls (HC) (both p?0.001), while IFN-Score-B differentiated
SLE and RA from HC (both p?0.001). In SLE, both scores were associated with
cutaneous and hematological (all p?0.05) but not musculoskeletal disease
activity. Comparing with bimodal (IFN-high/low) classification, significant
differences in IFN-scores were found between diagnostic groups within the
IFN-high group. Our continuous 2-score system is more clinically relevant than a
simple bimodal classification of IFN status. This system should allow improvement
in diagnosis, stratification, and therapy in IFN-mediated autoimmunity.