In this recent review, the authors provide a comparison of human and fly glycobiology and describe the "increasing opportunities to dissect pathologic mechanisms using Drosophila genetics."
Katoh T, Tiemeyer M. The N's and O's of Drosophila glycoprotein glycobiology. Glycoconj J. 2012 Aug 31. PubMed PMID: 22936173
The authors indicate that the proteins and pathways discussed are relevant to a number of diseases, including retinitis pigmentosa, Peters Plus syndrome, and diseases "such as autoimmunity, cancer progression, and congenital heart disease, in which altered mucin type O-glycosylation has been implicated."
Peters Plus syndrome is also known as Krause–van Schooneveld–Kivlin syndrome and Krause–Kivlin syndrome. It is listed on Orphanet and you can read more about it at GeneReviews.
If someone has the time and inclination to pull out the Drosophila gene names mentioned in the paper, and list them as a comment here, please do so.