Optical Coherence Tomography Abnormalities in NOTCH3 Mutation Carriers: A Matched Case-Control Study From UK Biobank.

OBJECTIVES This study aims to identify retinal biomarkers of NOTCH3 mutation carriers using optical coherence tomography (OCT) data from the UK Biobank.

METHODS We conducted a cross-sectional, matched case-control study of individuals with or without NOTCH3 mutation from the UK Biobank between 2006 and 2010. All participants had macular OCT scan and cognitive assessment. Cases were identified based on pathogenic/likely pathogenic NOTCH3 mutations and 1:1 matched with controls based on age, sex, hypertension, diabetes mellitus, and cigarette smoking status. Baseline characteristics and cognitive test scores were compared using χ2 or Mann-Whitney U test appropriately. Macular thickness at central, inner, and outer subfields and at each retinal layer was compared using Wilcoxon signed-rank test.

RESULTS Our analysis included 134 participants (67 cases, 67 controls) with a mean age of 54 ± 9 years. NOCTH3 mutation carriers performed worse in prospective memory (P=0.043), verbal and numerical reasoning (P=0.178), visual memory (P=0.227), and processing speed (P=0.101) than matched controls. There were no differences in visual acuity between the 2 groups. NOTCH3 mutation carriers had significantly thinner macular inner subfield at the superior (P=0.006), temporal (P=0.008), and nasal (P=0.034) quadrants, and significantly thinner macular RNFL (P=0.008) compared with age-, sex-, and vascular risk factor-matched controls.

CONCLUSION The presence of NOTCH3 mutation is associated with reduced thickness in the inner macular subfield and macular RFNL. These retinal changes may reflect early pericyte dysfunction and microvascular ischemia. Longitudinal studies are needed to assess the temporal relationship between these retinal changes, cerebrovascular disease progression, and clinical severity of disease.