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 4/10 Good --- scienceblogs.com http://feeds.feedburner.com/ScienceblogsCombinedFeed
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Wednesday, August 06, 2008 --- 23 days ago http://feeds.feedburner.com/~r/ScienceblogsCombinedFeed/~3/357709582/premature_h
 tags: bpr3.org/?p=52 , premature hair graying , autosomal dominant trait , genetics , horses , hair color , syntaxin-17 , melanocortin-1 receptor , cis-acting regulatory mutation , melanoma , evolution This horse is in the process of losing its pigment. It will end up being all white by the time it is eight years old. Image: Horse Wallpaper [ larger view ]. Even though I have always been a fan of black horses, my heart did leap at the sight of the noble Shadowfax racing towards Gandalf in response to his call in the Lord of the Rings . White horses have symbolized purity throughout most ages and cultures, so political leaders have often been portrayed astride a white horse. Interestingly, these so-called white horses are actually Gray. White horses have pink skin and blue eyes. Gray horses are typically born black, bay or chestnut in color but rapidly lose all hair pigmentation as they age, ending up completely white by the time they are eight years old. Meanwhile, their skin remains black and their eyes are typically dark, giving a silvery or grey cast to their seeming snowy-whiteness. This popular coat color results from an autosomal dominant mutation to a gene that was just identified by a research team at Uppsala University in Sweden. Unfortunately, this coat color is also linked to an increased risk of developing a specific form of cancer: melanoma. Thus, this finding has important implications for human medical research. Rea ... |
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