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Liu, C.Y. et al.

Liu, Shiraishi, Kao, Converse, Funderburgh, Corpuz, Conrad, Kao,

The cloning of mouse keratocan cDNA and genomic DNA and the characterization of its expression during eye development.

Keratan sulfate proteoglycans (KSPGs) play a pivotal role in the development and maintenance of corneal transparency. Keratocan, lumican, and mimecan (osteoglycin) are the major KSPGs in vertebrate corneas. To provide a better understanding of the structure/function relationship of keratocan, we have cloned both the mouse keratocan gene and its cDNA. We have also examined its expression during embryonic development. The mouse keratocan gene spans approximately 6.5 kilobases of the mouse genome and contains three exons and two introns. Northern blotting and in situ hybridization were employed to examine keratocan gene expression during mouse development. Unlike lumican gene, which is expressed by many tissues other than cornea, keratocan mRNA is more selectively expressed in the corneal tissue of the adult mouse. During embryonic development, keratocan mRNA was first detected in periocular mesenchymal cells migrating toward developing corneas on embryonic day 13.5 (E13.5). Its expression was gradually restricted to corneal stromal cells on E14. 5 approximately E18. 5. Interestingly, keratocan mRNA can be detected in scleral cells of E15.5 embryos, but not in E18.5 embryos. In adult eyes, keratocan mRNA can be detected in corneal keratocytes, but not in scleral cells.[1]

References

The cloning of mouse keratocan cDNA and genomic DNA and the characterization of its expression during eye development. Liu, C.Y., Shiraishi, A., Kao, C.W., Converse, R.L., Funderburgh, J.L., Corpuz, L.M., Conrad, G.W., Kao, W.W. J. Biol. Chem. (1998) [Pubmed]

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