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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Mutations in KERA, encoding keratocan, cause cornea plana.

Specialized collagens and small leucine-rich proteoglycans (SLRPs) interact to produce the transparent corneal structure. In cornea plana, the forward convex curvature is flattened, leading to a decrease in refraction. A more severe, recessively inherited form ( CNA2; MIM 217300) and a milder, dominantly inherited form (CNA1; MIM 121400) exist. CNA2 is a rare disorder with a worldwide distribution, but a high prevalence in the Finnish population. The gene mutated in CNA2 was assigned by linkage analysis to 12q (refs 4, 5), where there is a cluster of several SLRP genes. We cloned two additional SLRP genes highly expressed in cornea: KERA ( encoding keratocan) in 12q and OGN (encoding osteoglycin) in 9q. Here we report mutations in KERA in 47 CNA2 patients: 46 Finnish patients are homozygous for a founder missense mutation, leading to the substitution of a highly conserved amino acid; and one American patient is homozygous for a mutation leading to a premature stop codon that truncates the KERA protein. Our data establish that mutations in KERA cause CNA2. CNA1 patients had no mutations in these proteoglycan genes.[1]


  1. Mutations in KERA, encoding keratocan, cause cornea plana. Pellegata, N.S., Dieguez-Lucena, J.L., Joensuu, T., Lau, S., Montgomery, K.T., Krahe, R., Kivelä, T., Kucherlapati, R., Forsius, H., de la Chapelle, A. Nat. Genet. (2000) [Pubmed]
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