J Korean Ophthalmol Soc.  2017 Apr;58(4):380-386. 10.3341/jkos.2017.58.4.380.

Clinical Characteristics and Prognosis of Fuchs Dystrophy According to COL8A2 Gene Mutation Status

• Kim HA
• Whang WJ
• Lee JH
• Chae H
• Kim M
• Kim MS

• KMID: 2376591
• DOI: http://doi.org/10.3341/jkos.2017.58.4.380

Abstract

PURPOSE
To compare the clinical characteristics and prognosis of Fuchs dystrophy patients according to COL8A2 gene mutation status.
METHODS
Eighty-one patients (162 eyes) initially diagnosed with Fuchs dystrophy from 1996 to 2015 were divided into two groups according to COL8A2 gene mutation status. Retrospective analysis was performed comparing gender, age at diagnosis, presence of family history, diabetes mellitus, symptoms of blurred vision in the morning, changes in central corneal thickness and endothelial cell density with time, need for corneal transplantation, and pre-operative corneal status in the two groups.
RESULTS
Of the 81 patients, 12 were shown to harbor a COL8A2 gene mutation. Individuals with mutation were significantly associated with presence of family history, diabetes mellitus, and blurred vision in the morning (p = 0.021, p = 0.024, p = 0.044, respectively). They also had significantly thicker central cornea and lower endothelial cell density at the time of diagnosis (p = 0.020, p = 0.005, respectively). The differences in central corneal thickness and endothelial cell density between the two eyes in one patient were significantly smaller in patients with gene mutation (p = 0.043, p = 0.022, respectively). Over a 5-year follow-up period, 60.0% of eyes in patients with gene mutation and 19.2% of eyes in patients without gene mutation underwent corneal transplantation, a significant difference between the two groups (p = 0.014).
CONCLUSIONS
By testing for COL8A2 gene mutation, early binocular disease progression and the possible need for corneal transplantation in the future can be predicted among patients diagnosed with Fuchs dystrophy.

Keyword

COL8A2; Fuchs dystrophy

MeSH Terms

Cornea
Corneal Transplantation
Diabetes Mellitus
Diagnosis
Disease Progression
Endothelial Cells
Follow-Up Studies
Fuchs' Endothelial Dystrophy*
Humans
Prognosis*
Retrospective Studies
Telescopes

Figure

• 

  Figure 1. Comparison of central corneal thickness (CCT). (A) CCT (μ m) according to COL8A2 gene mutation status (* p-value = 0.020). (B) Difference of CCT (μ m) between the two eyes in one patient according to COL8A2 gene mutation status († p-value = 0.043). p-values were calculated by Mann-Whitney test.

• 

  Figure 2. Comparison of endothelial cell density (ECD). (A) ECD (cells/mm2) according to COL8A2 gene mutation status (* p-value = 0.005). (B) Difference of ECD (cells/mm2) between two eyes in one patient according to COL8A2 gene mutation status († p-value = 0.022). Only the patients with checkable endothelial cell density in both eyes were included. p-values were calculated by Mann-Whitney test.

Reference

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