In January, Rich asked people to share their 23andMe results for the MTHFS gene to see if we can sort out which SNP or SNPs may be detrimental in ME/CFS. I didn't see where anyone responded. (You can find your MTHFS results by going to
https://www.23andme.com/you/explorer/ and logging in and entering "MTHFS" for the gene name.)
It's important people contribute so we can try to figure out when folinic acid should be supplemented or avoided for certain people as part of a methylation protocol.
I may be intolerant to folinic acid (seems to cause exacerbation of fatigue, irritation of taste buds) and so am providing my DNA results. We need MTHFS results from as many other people as possible, though, whether intolerant or not.
If you could also include the one SHMT result that Yasko tests for, that may be helpful also. I'm heterozygous (AG) for that SNP (SHMT1 C1420T rs1979277), and the first day I took folinic acid it helped, as might be expected, but then I seemed to gradually get worse over several days (800-1600 mcg/day).
So with respect to that SNP it might be that I have a detrimental down-regulation of MTHFS and Rich has a detrimental up-regulation (or vice versa). A down-reg would cause a build up of folinic acid and thus inhibition of SHMT (and several other enzymes outside the methylation cycle as well) and create an intolerance to supplementation. An up-reg can cause an increased turnover rate and depletion of cellular folate. Note: The C allele - what Rich has two copies of - is the ancestral (wild type) allele according to the NCBI data page.
