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Alió Del Barrio JL, Chung DD, Al-Shymali O, Barrington A, Jatavallabhula K, Swamy VS, Yébana P, Angélica Henríquez-Recine M, Boto-de-Los-Bueis A, Alió JL, Aldave AJ. Punctiform and Polychromatic Pre-Descemet Corneal Dystrophy: Clinical Evaluation and Identification of the Genetic Basis. Am J Ophthalmol 2020; 212:88-97. [PMID: 31782998 DOI: 10.1016/j.ajo.2019.11.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 11/18/2019] [Accepted: 11/19/2019] [Indexed: 12/13/2022]
Abstract
PURPOSE This study reports the clinical features and genetic bases of 3 previously unreported families with punctiform and polychromatic pre-Descemet corneal dystrophy (PPPCD). DESIGN Observational case series. METHODS Full ophthalmic assessment was performed for members of 3 unreported families with PPPCD. Structural and biomechanical alterations of the cornea were screened. Whole exome sequencing (WES) was performed in the first family. Novel or rare variants that segregated with the affected status were screened in the other 2 families using Sanger sequencing. Identified variants that segregated with the affected status in all families were characterized by using in silico prediction tools and/or in vitro splice assays. Additionally, 2 previously reported PPPCD families were screened for variants identified in the 3 unreported PPPCD families. RESULTS PPPCD was diagnosed in 12 of the 21 examined members of the 3 unreported families. The only refractive, topographic, or biomechanical abnormality associated with PPPCD was a significantly increased corneal stiffness. WES and Sanger sequencing identified 2 variants that segregated with the affected status in all 3 families: a rare intronic PDZD8 c.872+10A>T variant and a novel missense PRDX3 c.568G>C (p.Asp190His) variant. The same PRDX3 variant was identified in the previously reported PPPCD family expressing the common PPPCD phenotype and was predicted by in silico prediction tools to be damaging to protein function. CONCLUSIONS PPPCD is associated with an alteration of corneal biomechanics and a novel missense variant in PRDX3. Screening of additional families will determine whether all families demonstrate a PRDX3 variant or whether locus heterogeneity may exist for PPPCD.
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Affiliation(s)
- Jorge L Alió Del Barrio
- Cornea, Cataract and Refractive Surgery Unit, Vissum Corporación, Alicante, Spain; Division of Ophthalmology, School of Medicine, Universidad Miguel Hernández, Alicante, Spain
| | - Doug D Chung
- Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Olena Al-Shymali
- Cornea, Cataract and Refractive Surgery Unit, Vissum Corporación, Alicante, Spain
| | - Alice Barrington
- Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Kavya Jatavallabhula
- Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Vinay S Swamy
- Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Pilar Yébana
- Cornea, Cataract and Refractive Surgery Unit, Vissum Corporación, Alicante, Spain
| | | | | | - Jorge L Alió
- Cornea, Cataract and Refractive Surgery Unit, Vissum Corporación, Alicante, Spain; Division of Ophthalmology, School of Medicine, Universidad Miguel Hernández, Alicante, Spain
| | - Anthony J Aldave
- Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA.
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