The other pathway is the betaine homocysteine methionine methyltransferase (BHMT) pathway. It uses betaine (trimethylglycine or TMG) and homocysteine as reactants, and it produces methionine and dimethylglycine (DMG). These two pathways are in parallel, and both are important to humans, especially depending on their current nutritional situation.
When betaine-HCl is used in large dosages to compensate for low stomach acid, which is present in many PWCs, the concern is that the betaine will overdrive the BHMT pathway, taking flow away from the methionine synthase pathway, which is the one we are trying to encourage.
The BHMT pathway does complete the methylation cycle, though, and therefore it does help to produce SAMe, which is in this cycle, and which is needed for methylation reactions. One of the methylation reactions is the methylation of cobalamin (B12). This is necessary to supply new methylcobalamin as a coenzyme for the methionine synthase reaction from time to time. So it's important to have some SAMe on hand, even to support the methionine synthase pathway.
Dr. Amy Yasko has suggested that the BHMT reaction can be encouraged initially, and then, when the supplements are in place to support the methionine synthase reaction (that is, the B12, 5-methyl tetrahydrofolate, and other B vitamins and cofactor minerals), then the flow that is being carried by the BHMT pathway can be shunted to the methionine synthase pathway, by supplementing DMG, thus slowing the BHMT reaction by what is called in chemistry "product inhibition."
http://tinyurl.com/5rwybkw
Question specifically for Rich VanKonyenburg and inviting discussion from forum members.
A little history of my own supplementation. I had been following a detox program from a toxicologist, and this program is so incredibly similar to Dr. Yaskos and your simplified approach. The only aspect missing from this program was direct methylation supplementation. Specifically the seperate forms of Vitamin B's and folics. So essentially, prior to starting Freddds recommendations of the ad B12 and methyl B12 and the methylfolate, I already had in place the supportive supplements and had been already taking them for some time. Some time would denote atleast a couple of years. I initially had made very good progress as his program (Toxicologist) atleast got me on my feet and able to work again. However, I still seemed to suffer from multiple infections and the fatigue was most definately still a factor and still interferred with having any type of "normal" life.
Hence, it led me to this wonderful forum of like sufferers. I notice some here in which have had exposures to mold, which is also in my history, and also Lyme Sufferers, in which I had an argumentative result in my own Western Blot, and was subsequently treated for Lyme by both antibiotics and herbals for a number of years. Again, with identifiable results but no resolution to my overall fatigue and wellness.
Having said all this, I initially chose Freddd's suggestions, to allow me to observe my bodies reactions and I just couldn't afford the nutragenomics testing. Thankfully, I was able to take his suggestions and although I did go through some "herx" like reactions, they weren't anything like I experienced with The Toxicologist's protocol or the lyme protocols. So, things seemed to have progressed rapidly for me with Freddd's supplementations. Even with Freddd's supplementations, I am quite avidly following the suggestions of Dr. Amy Yasko and you, Rich VanK in observations.
Sooooooo, I have recently begun adding DMG. I had already been taking TMG in a short time after starting the ad B12, methyl B12, the Yarrow B right, and the methylfolate. I realize that my ability to take the high doses I have outlined in other posts are not the normal result of most of those here. Is this attributable to the fact I had already been taking the recommended adjuncts? The ad b12 had a very noticable affect and I attribute it to another elevation in my wellness. Clearly identifiable results. The same with the addition of methyl B12, and subsequently the methylfolate.
I also had a noticable reaction to Niacinamide. Only after taking niacinamide was I able to regulate my body temperature and maintain warmth. This after years of not being able to keep warm. My sensitivity to cold is not anywhere near the extreme it used to be. I would say my reaction to cold is now "normal".
I have recently added DMG with again had identifiable reactions. I had read that adding DMG can cause a revved feeling. I went through exactly that and still do from time to time. I had read that the revved feeling could be a positive in that a system is resetting but I panicked and started cutting the dose. When I did this, I went through a reversal and actually felt worse. It was the only thing I changed.
Question: Might this indicate a BHMT polymorphism? Is this what others experience with this type of polymorphism?
I have basically been trying to learn the entire Krebbs cycle including the methylation cycle and have been experimenting with supplementing different points and observing my bodies reactions.
LaurieL