Right. I think G=C and A=T. I have this written down in my notebook, which I can't find at the moment because I think I left it at work. So some SNP's in Yasko might be listed using C or T and 23andME use A and G. Check out some of the links posted earlier in this thread and you can kind of figure out the translations on some. But some are still confusing.
Hi, drex and the group.
I haven't yet had time to pull together the Yasko nutrigenomics results and the 23andme panel in my head, but I do want to point out something. These letters, G,C,A, and T represent nucleotides in the DNA molecule (guanine, cytosine, adenine and thymine). A single nucleotide polymorphism or SNP occurs when one of these is substituted for another. For a particular SNP, the letter designating the nucleotide that is actually present in the person's DNA is designated the "call letter."
The confusion between the results from different labs that characterize SNPs is that there is not always agreement on which nucleotide is the normal or "norm" for this SNP. The reason is that some SNPs are very common, and could be near 50% frequency in the population. Also, the frequency of a particular SNP can vary quite a lot between different ethnic groups, because of their differing genomic heritage. So one lab could consider a G in a certain location as being the norm, while a C is considered the SNP, while another lab could view this oppositely. So it's important to get back to the call letter that each lab is reporting for a particular person to be able to compare results.
Additional confusion may come from the fact that a lab like 23andme does haplotype analyses, which amounts to analyzing for fairly long segments of DNA that tend to be inherited in whole pieces, while others, such as the one Yasko uses, analyze individual genes for their SNPs. 23andme infers the presence of SNPs from the presence of certain haplotypes, each of which can contain many individual genes on them. With the 23andme results, it would be important to find out how they are defining a particular SNP, i.e. what call letter they are viewing as the SNP.
I hope this helps. I also hope that I will be able to spend more time studying this sometime soon, because I think it can be a powerful thing.
Best regards,
Rich