13q32.1 as a candidate region for physiological anisocoria
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Publication Date
2022Journal Title
British Journal of Ophthalmology
ISSN
0007-1161
Publisher
BMJ Publishing Group
Type
Article
This Version
AM
Metadata
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Mollon, J., Bosten, J., Lawrance-Owen, A., Bargary, G., & Goodbourn, P. (2022). 13q32.1 as a candidate region for physiological anisocoria. British Journal of Ophthalmology https://doi.org/10.1136/bjophthalmol-2021-319936
Abstract
ABSTRACT
Background. Physiological anisocoria is an asymmetry of pupil size in the absence of pathology.
Methods. Images of the pupils under standard illumination were collected in the course of a whole-genome association study of a range of visual functions in 1060 healthy adults. DNA for each participant was extracted from saliva samples.
Results. We found no relationship between anisocoria and the difference in refraction between the eyes, nor between anisocoria and difference in acuity. There was a small but significant relationship with lightness of the iris, in that the eye with the smaller pupil was associated with the lighter iris. There was a strong association between anisocoria and a local region of chromosome 13 (13q32.1), a region lying between the genes GPR180 and SOX21. The strongest association was with the single nucleotide polymorphism rs9524583.
Conclusion. The very specific region associated with anisocoria is one where microdeletions (or microduplications) are known to lead to abnormal development of pupil dilator muscle and hence to the autosomal dominant condition of microcoria. It is possible that alterations at 13q32.1 act by altering the expression of SOX21, which encodes a nuclear transcription factor.
Sponsorship
Gatsby Charitable Foundation
Gonville and Caius College
Funder references
Gatsby Charitable Foundation (GAT2903)
Biotechnology and Biological Sciences Research Council (BB/S000623/1)
Identifiers
External DOI: https://doi.org/10.1136/bjophthalmol-2021-319936
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334688
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