Originally posted by Sirius:
The merle phenotype of the dog is a pattern of pigmentation associated with a wide range of developmental defects. A whole genome scan for merle by using 41 Shetland Sheepdogs showed LD with FH2537 on CFA10. No genes previously implicated in WS (PAX3, MITF, SOX10, EDNRB, and EDN3) map to this region. However, another gene important in pigmentation, SILV, is located {approx}0.2 Mb from this marker. The SILV protein appears to be necessary for the formation of the fibril matrix upon which melanin intermediates are deposited late in melanosome maturation (24). Other studies have shown that SILV may also participate in melanin biosynthesis by accelerating the conversion of 5,6-dihydroxyindole-2-carboxylic acid to melanin (34, 35).
http://www.pnas.org/cgi/content/full/103/5/1376?maxtosh...0&resourcetype=HWCIT