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I found this excellent description in Amy Yasko's forum: ch3nutrigenomics.com. It was posted by one of the members on the site- raji: http://www.ch3nutrigenomics...
This is a private blog, but it is a very rich source of information about methylation, nutrigenomics and dietary supplementation

Here is a copy of the post:

"Common Terminology:

Methyl group: A methyl group is simply a single carbon atom bonded to 3 hydrogen atoms (CH3).

Methylation: Transfer of methyl groups from one chemical to another is called methylation. Essentially any chemical compound that has a methyl group as part of its chemical ... ..more


Summary of analogies used in methylation community: CEOs: Directs each corporation in organized steps
Supervisors: Enzymes such as MTHFRs, COMT, SHMT, and BHMT
Enzymes are proteins that are produced by living cells and regulate the body’s process to breakdown products, such as ammonia.
Employees: Chemicals, proteins, DNA, etc.
Work tags: Methyl groups (Homocysteine, SAM, Methionine) The Chain Gang: Homocysteine (HCY)
Synopsis of the Cycles
1). Power Plant = Citric Acid Cycle =
Formerly known as the Kreb’s cycle) Recognized as the mitochondrial or energy cycle
2). Garbage Dump (& Recycling) =
The urea cycle, ammonia cleanup & nitric oxide production (heart/blood vessel protection)
3). Better Health 4 Life Corp (BH4) = Communications “AT&T” & toxic waste cleanup Neurotalkers: Dopamine, Serotonin, & Norepi

4). SAM’s Corp. = Methionine Cycle =
The major producer of methyl donors and the passageway to the garbage dump (NOS) & liver via the CBS enzyme
5). Farmer Folate = Folate Cycle =
Homegrown” RNA & DNA, methyl groups and Homocysteine (HCY) regulation

The Meaning of Methylation
Methylation is truly a multi-tasking marvel that allows us to be “healthy and human.” Though this highly intricate process occurs within each cell as well as in the fluid supplying the brain and within the liver, it is responsible for the most vital undertakings throughout body chemistry. Methylation determines who we are, what we look like, and how we behave and it is central to our physical, emotional, and mental wellbeing. Without methylation, we could not survive; hence, it is the perfect pathway to focus on for understanding autoimmune ... ..more

Annonymous

What is the Urea Cycle ?

  3 years, 8 months ago

The Urea Cycle filters & processes toxic waste. Makes nitric oxide to limit free radical injury & maintains open & clean blood vessels to protect the heart & brain.
#NitricOxide #UreaCycle #Methylation ..more

Annonymous

What is the Urea Cycle ?

  3 years, 8 months ago

The Urea Cycle filters & processes toxic waste. Makes nitric oxide to limit free radical injury & maintains open & clean blood vessels to protect the heart & brain.
#NitricOxide #UreaCycle #Methylation ..more