summary of sw tests
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KIT is officially the most
KIT is officially the most easily mutated gene in horses according to researchers. It also holds that title in a few other species but I can't remember them off the top of my head. This basically means that KIT likely has a much larger amount of mutations than we have even observed. Hence why Sabino1 testing doesn't do much for people wanting to find out if their horse has sabino. There are many many mutations of sabino, but only a test for 1 that is only found in a handful of breeds. There are possibly hundreds of KIT mutations. And at least 3 different roan mutations (Common classic roan, roan in European drafts, and Catch A Bird roan in TBs) which are also mutations on KIT.
^ Lol, yes very true. I
^ Lol, yes very true.
I love the amount of visual variation all the KIT mutations have too. KIT is also a very large locus so there is more room for mutations to happen. SW likely isn't going to have nearly as many mutations as KIT and so far all of the SW mutations found look the same.
This is the best summary of
This is the best summary of KIT and its mutations I have found. It is outdated just due to researchers having found more mutations since it was written, but it is still incredibly helpful.
Correct on Splash (at least
Correct on Splash (at least for now). SW1, SW2, and SW3. So far, SW1 seems to be by far the most common.
I can't answer regarding the ermine spots. I'm sure some one else will. Also, I am not a Quarter Horse person so I will leave that to someone else.
Another White pattern gene is Dominant White, of which there are several mutations.
You are correct that FRAME Overo cannot be homozygous, or the foal will die within hours or a couple of days. Sabino and SW1 can be and often are homozygous. Early theories are that SW2 and SW3 are likely embryonic lethal.