So maybe I’m putting too much emphasis on all of this.... I guess I’m just desperate to help her and I have to believe there is a biomedical component somehow.
I think you are putting too much of an emphasis on the importance of common SNPs and have been confused by the simplistic understanding of so-called "methylation" issues that proliferate on the internet.
There undoubtedly is a very significant biomedical component but it is far more complex than "treating" a few SNPs.
I have no particular insight into autism, but many PWME find supplements of various B vitamins, particularly B12/folate and others involved in energy metabolism, are very helpful but this has little to do with SNPs. It is more that widespread metabolic derangement seems to be a hallmark of this disease and sometimes such supplements act as stimulants to pathways that are adversely affected in that individual.
Similar metabolic problems may exist in your daughter but SNPs are not the cause and a simplistic SNP analysis will not give any particular insight into them. Sometimes OAT tests can give some insights into metabolic slow points.
Unfortunately it is often a trial and error process to find the helpful supplements.
ETA I'm not saying that SNP analysis is useless. It can be helpful in identifying SNPs and SNP combinations which are likely to have noticeable consequences. However most of the SNPs commonly identified in analysis programs have little or not effect.
The B12 SNP you are concerned with is one with small effect. In combination with an MTR SNP which your daughter doesn't have, it would be more significant.
It is not likely to be influencing blood B12 levels as you seem to think. By the way these are normal - at the high end of the range but not elevated. The whole point of a normal range is to reflect the natural variation in a parameter. You daughter's value fits into this natural variation.
Further tests such as MMA would be needed to determine if there are hidden B12 problems.
There is no easy short cut with SNPs unfortunately. The programs which just indicate a variant is present are not helpful. Quite a bit of research is necessary to identify the ones that are likely to have noticeable consequences.
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