Missense mutations in the sodium borate co-transporter SLC4A11 cause late onset Fuchs corneal dystrophy

• Published in: Human mutation Vol. 31; no. 11; pp. 1261 - 1268
• Main Authors: Riazuddin, S. Amer, Vithana, Eranga N., Seet, Li-Fong, Liu, Yangjian, Al-Saif, Amr, Koh, Li Wei, Heng, Yee Meng, Aung, Tin, Meadows, Danielle N., Eghrari, Allen O., Gottsch, John D., Katsanis, Nicholas
• Format: Journal Article
• Language: English
• Published: 14.10.2010
• ISSN: 1059-7794; 1098-1004
• DOI: 10.1002/humu.21356

Homozygous mutations in the sodium-bicarbonate transporter SLC4A11 cause two early onset corneal dystrophies: congenital hereditary endothelial dystrophy (CHED) and Harboyan syndrome. More recently, four sporadic patients with late onset Fuchs corneal dystrophy (FCD), a common age-related disorder, were also reported to harbor heterozygous mutations at this locus. We therefore tested the hypothesis that SLC4A11 contributes to FCD and asked whether mutations in SLC4A11 are responsible for familial cases of late onset FCD. We sequenced SLC4A11 in 192 sporadic and small nuclear late-onset FCD families and found seven heterozygous missense novel variations that were absent from ethnically matched controls. Familial data available for one of these mutations showed segregation under a dominant model in a three-generational family. In silico analyses suggested that most of these substitutions are intolerant, while biochemical studies of the mutant protein indicated that these alleles impact the localization and/or post-translational modification of the protein. These results suggest that heterozygous in SLC4A11 are modest contributors to the pathogenesis of adult FCD, suggesting a causality continuum between FCD and CHED. Taken together with a recent model between FCD and yet another early onset corneal dystrophy, PPCD, our data suggest a shared pathomechanism and genetic overlap across several corneal dystrophies.