IngentaConnect Corneal fluorescence in relation to genetic and environmental fac...

Authors: Kessel, Line¹; Hougaard, Jesper Leth¹; Kyvik, Kirsten Ohm²; Sander, Birgit¹; Sørensen, Thorkild I. A.³; Larsen, Michael¹

Source: Acta Ophthalmologica Scandinavica, Volume 81, Number 5, October 2003 , pp. 508-513(6)

Publisher: Blackwell Publishing

Abstract:

. Purpose:

Corneal fluorescence is believed to be caused by advanced glycation end products formed by non-enzymatic glycation on corneal proteins. The purpose of the present twin study was to examine whether the process is related to genetic or environmental factors. Methods:

Corneal fluorescence was measured in 59 monozygotic and 54 dizygotic twin pairs. The influences of genetic and environmental factors were estimated using structural equation modelling. Results:

Interindividual variation in corneal fluorescence was attributable to environmental factors, whereas the effect of genetic factors was of little or no significance. Corneal fluorescence correlated significantly with smoking habits (r = 0.38) and the 2-hour oral glucose tolerance test response (r = 0.27), and increased with age (p < 0.0001). Conclusion:

Fluorophore accumulation in the cornea was attributable to age and environmental effects, of which smoking was the most conspicuous identifiable factor, although glucose was also of relevance. However, the greater part of interindividual variation in corneal fluorescence remains unexplained.

Keywords: cornea; diabetes mellitus; fluorescence; fluorophotometry; heritability; twins

Document Type: Research article

DOI: 10.1034/j.1600-0420.2003.00089.x

Affiliations: 1: Department of Ophthalmology, Herlev Hospital, University of Copenhagen, Denmark 2: Danish Twin Registry, University of Southern Denmark, Odense, Denmark 3: Danish Epidemiology Science Centre, Institute of Preventive Medicine, Copenhagen University Hospital, Denmark

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Corneal fluorescence in relation to genetic and environmental factors: a twin study