Mutations in SCO2 are associated with autosomal-dominant high-grade myopia.

Journal Article (Journal Article)

Myopia, or near-sightedness, is an ocular refractive error of unfocused image quality in front of the retinal plane. Individuals with high-grade myopia (dioptric power greater than -6.00) are predisposed to ocular morbidities such as glaucoma, retinal detachment, and myopic maculopathy. Nonsyndromic, high-grade myopia is highly heritable, and to date multiple gene loci have been reported. We performed exome sequencing in 4 individuals from an 11-member family of European descent from the United States. Affected individuals had a mean dioptric spherical equivalent of -22.00 sphere. A premature stop codon mutation c.157C>T (p.Gln53*) cosegregating with disease was discovered within SCO2 that maps to chromosome 22q13.33. Subsequent analyses identified three additional mutations in three highly myopic unrelated individuals (c.341G>A, c.418G>A, and c.776C>T). To determine differential gene expression in a developmental mouse model, we induced myopia by applying a -15.00D lens over one eye. Messenger RNA levels of SCO2 were significantly downregulated in myopic mouse retinae. Immunohistochemistry in mouse eyes confirmed SCO2 protein localization in retina, retinal pigment epithelium, and sclera. SCO2 encodes for a copper homeostasis protein influential in mitochondrial cytochrome c oxidase activity. Copper deficiencies have been linked with photoreceptor loss and myopia with increased scleral wall elasticity. Retinal thinning has been reported with an SC02 variant. Human mutation identification with support from an induced myopic animal provides biological insights of myopic development.

Full Text

Duke Authors

Cited Authors

  • Tran-Viet, K-N; Powell, C; Barathi, VA; Klemm, T; Maurer-Stroh, S; Limviphuvadh, V; Soler, V; Ho, C; Yanovitch, T; Schneider, G; Li, Y-J; Nading, E; Metlapally, R; Saw, S-M; Goh, L; Rozen, S; Young, TL

Published Date

  • May 2, 2013

Published In

Volume / Issue

  • 92 / 5

Start / End Page

  • 820 - 826

PubMed ID

  • 23643385

Pubmed Central ID

  • PMC3644634

Electronic International Standard Serial Number (EISSN)

  • 1537-6605

Digital Object Identifier (DOI)

  • 10.1016/j.ajhg.2013.04.005


  • eng

Conference Location

  • United States