Hi, all.
As part of the effort to try to sort out who is intolerant to folic acid, folinic acid, glutathione and its constituents (as in NAC and whey protein), and who is not helped by forms of B2 other than methyl- and adenosyl-B12, and why, I am going to post my 23andme.com polymorphism results for three genes: DHFR, MTHFS, and MMACHC.
Here's the rationale: As far as I know, I personally do not have any of these issues, so comparing to my polymorphism results might be a place to start, though obviously N=1, with me being the 1, is not going to give statistical significance. I do think, though, that doing a comparison with the results of people who know they have one or the other of this issues might tell us whether any of the polymorphisms characterized by 23andme might be involved in producing these issues. Also, maybe some others who know that they don't have these issues will post their results, and that will help us to see which SNPs might be important. I hope you all will understand that I'm not setting myself up as the perfect genetic model, far from it! This is just a place to start. I suspect that we will find that if a person is homozygous for a certain crucial SNP, that may be what causes an intolerance of this sort. It might be a sufficiently clear result that we won't need a lot of people's data to figure it out.
Note that it is possible that the SNPs characterized by 23andme might not include the ones that are important to us in the present context, but on the other hand, they may, and this is at least a place to start.
Note also that the intolerance of folic acid may be biochemical in nature (such as having low NADPH) rather than genetic, and if so, we won't find a connection here, but I think it is worth a try.
O.K., first the folic acid intolerance. If it's genetic, I think it must involve the DHFR gene, because that one codes for an enzyme that must be used to chemically reduce folic acid before it can be used. If that reaction is slow, folic acid will build up in the blood and could hinder the transport of active folates into the cells. So here are my polymorphism results for DHFR:
Gene Position SNP Versions Richard Van Konynenburg's Genotype
DHFR 79960547 rs7387 A or T TT
DHFR 79970592 rs1643659 C or T TT
DHFR 79972074 rs1677693 G or T GG
DHFR 79975205 rs1643649 C or T TT
DHFR 79975227 rs11951910 C or T TT
DHFR 79978113 rs865646 G or T GG
DHFR 79980489 rs13161245 A or G AA
DHFR 79980896 rs10072026 C or T TT
DHFR 79983754 rs11490741 C or T CC
DHFR 79983761 rs863215 C or T CC
DHFR 79985331 rs1478834 A or C CC
DHFR, MSH3 79986537 rs1650697 A or G GG
O.K., next is folinic acid intolerance. I think this has to involve the MTHFS gene, because it codes for the only enzyme that can convert folinic acid to another form of folate, which can then be converted to others. If this reaction is slow, folinic acid can build up, and that will inhibit the SHMT reaction, which will hinder the synthesis of 5-MTHF, needed for the methylation cycle. So here are my MTHFS results:
Gene Position SNP Versions Richard Van Konynenburg's Genotype
MTHFS 77924615 rs8923 C or T CT
MTHFS 77925626 rs2733103 C or T CC
MTHFS 77925800 rs16971427 A or C AA
MTHFS 77929052 rs655473 A or G AA
MTHFS 77931252 rs17284990 C or T TT
MTHFS 77941626 rs16971450 A or G AA
MTHFS 77942037 rs6495446 C or T CT
MTHFS 77945097 rs7177659 A or C CC
MTHFS 77945214 rs6495449 A or G GG
MTHFS 77949320 rs17285431 A or C AC
MTHFS 77951108 rs6495451 C or T CT
MTHFS 77952423 rs2586154 A or G GG
MTHFS 77955337 rs12899781 G or T GT
MTHFS 77959026 rs16971478 A or G AA
MTHFS 77959188 rs2586153 C or T CC
MTHFS 77961443 rs2562744 A or C AA
MTHFS 77964742 rs2733106 A or G AA
MTHFS 77965338 rs12438477 A or C CC
MTHFS 77969105 rs12898642 C or T CT
MTHFS 77970821 rs2586182 A or C AA
MTHFS 77971712 rs2733088 A or G AG
MTHFS 77973395 rs12440798 C or T CC
O.K., now the combination of the other features: intolerance of glutathione, NAC, and whey protein, and inability to utilize forms of B12 other than methyl- and adenosyl-B12. There are more than one mutation that can cause this, but the most common is mutations in the MMACHC gene, which codes for the CblC complementation group. Here are my results for that one:
Gene Position SNP Versions Richard Van Konynenburg's Genotype
MMACHC 45743033 rs12029322 C or T CC
MMACHC 45744346 rs10789465 C or T CT
MMACHC 45746515 rs2275276 A or G AG
MMACHC 45746525 i5004496 C or T CC
MMACHC 45746541 i5004494 C or T TT
MMACHC 45746588 i5004495 C or T CC
MMACHC 45747107 i5004497 A or G GG
MMACHC 45747363 rs16832550 C or T CC
MMACHC 45748734 rs882803 A or G AG
O.K., that's it. I may have opened a Pandora's box, because the comparisons may be pretty complex with all these possible polymorphisms, but maybe something helpful will come out of this.
Best regards,
Rich