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Article

Association of FGF4L1 Retrogene Insertion with Prolapsed Gland of the Nictitans (Cherry Eye) in Dogs

1
Wisdom Panel, Mars Petcare Science and Diagnostics, Portland, OR 97209, USA
2
Wisdom Panel, Mars Petcare Science and Diagnostics, Waltham on the Wolds, Leicestershire LE14 4RS, UK
3
Wisdom Panel, Mars Petcare Science and Diagnostics, 00581 Helsinki, Finland
*
Author to whom correspondence should be addressed.
Genes 2024, 15(2), 198; https://doi.org/10.3390/genes15020198
Submission received: 19 December 2023 / Revised: 26 January 2024 / Accepted: 30 January 2024 / Published: 1 February 2024
(This article belongs to the Special Issue Companion Animal Genetics and Genomics)

Abstract

Cherry eye is the common name for prolapse of the nictitans gland, a tear-producing gland situated under the third eyelid of dogs. Cherry eye is characterized by a red fleshy protuberance in the corner of the eye, resembling a cherry. This protrusion is a displacement of the normal gland of the third eyelid, thought to be caused by a defect in the connective tissue that secures the gland in place. Options for treatment may include anti-inflammatory medications in mild cases, but surgical replacement of the gland is usually indicated. Cherry eye is most often seen in dogs under the age of two years, with certain breeds having a higher incidence, suggesting a potential genetic association. Integration of panel genetic testing into routine clinical practice allows for the generation of large numbers of genotyped individuals paired with clinical records and enables the investigation of common disorders using a genome-wide association study (GWAS) approach at scale. In this investigation, several thousand cases and controls for cherry eye in both purebred dogs and mixed breeds are used for a large-scale GWAS, revealing a single peak of genome-wide significance on canine chromosome 18, directly at the location of the previously identified FGF4 insertion known to cause chondrodysplasia in several breeds.
Keywords: cherry eye; prolapsed nictitans; third eyelid gland; canine; GWAS; genetics; FGF4; FGF4L1; chondrodysplasia cherry eye; prolapsed nictitans; third eyelid gland; canine; GWAS; genetics; FGF4; FGF4L1; chondrodysplasia

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MDPI and ACS Style

Freyer, J.; Labadie, J.D.; Huff, J.T.; Denyer, M.; Forman, O.P.; Chodroff Foran, R.; Donner, J. Association of FGF4L1 Retrogene Insertion with Prolapsed Gland of the Nictitans (Cherry Eye) in Dogs. Genes 2024, 15, 198. https://doi.org/10.3390/genes15020198

AMA Style

Freyer J, Labadie JD, Huff JT, Denyer M, Forman OP, Chodroff Foran R, Donner J. Association of FGF4L1 Retrogene Insertion with Prolapsed Gland of the Nictitans (Cherry Eye) in Dogs. Genes. 2024; 15(2):198. https://doi.org/10.3390/genes15020198

Chicago/Turabian Style

Freyer, Jamie, Julia D. Labadie, Jason T. Huff, Michael Denyer, Oliver P. Forman, Rebecca Chodroff Foran, and Jonas Donner. 2024. "Association of FGF4L1 Retrogene Insertion with Prolapsed Gland of the Nictitans (Cherry Eye) in Dogs" Genes 15, no. 2: 198. https://doi.org/10.3390/genes15020198

APA Style

Freyer, J., Labadie, J. D., Huff, J. T., Denyer, M., Forman, O. P., Chodroff Foran, R., & Donner, J. (2024). Association of FGF4L1 Retrogene Insertion with Prolapsed Gland of the Nictitans (Cherry Eye) in Dogs. Genes, 15(2), 198. https://doi.org/10.3390/genes15020198

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