By Helen Janneson Bense
A1298C single nucleotide polymorphism (SNP) affects the enzyme known as 5,10 MethyleneTetraHydroFolate Reductase (MTHFR). This polymorphism involves a down regulation of the MTHFR enzyme, responsible for the backwards reaction of the folate cycle, where 5-methylfolate (5MTHF) is converted into tetrahydrofolate (THF). This reaction is most important for the production of BH4 – tetrahydrobiopterin. Each turn of the folate cycle and conversion of 5MTHF to THF produces 1 molecule of BH4. In heterozygous and homozygous states, enzyme activity will be compromised by
approximately 30% and 70% respectively.
Functions of BH4
Cofactor for all three isotypes of nitric ... ..more
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:
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
What does it mean to "spare dopamine"? As mentioned in the above COMT discussion. Not use it? Not create it? ..more
#Sympathetic Nervous System “Fight or flight” or “Type A’s”
There are 3 basic #SNS Dominant subtypes: Basic, Extreme, & Inefficient SNS Dominant types. The following is a summary of the average SNS Dominant types.
Personality traits vary widely in this group depending on whether they are more analytical vs. emotional. For instance, more emotionally based SNS Dominants are likely to be more volatile and “nervous” whereas the more analytical type does not.
The sympathetic nervous system (SNS) activates the glands and organs that defend the body against attack, whether it is running from a saber toothed tiger or you are struggling with a dreadful job and difficult boss. It is called the fight or flight system and once activated, it directs more blood to the muscles, #adrenals and the brain yet away from the digestive organs and skin. The adrenals pump out #epinephrine while the sympathetic nerve endings throughout the body release #norepinephrine . This system is #catabolic , which simply means that energy is used to prepare for defense, rather than for nourishment, healing, or waste removal. #Sympathetic activity triggers the thyroid and adrenal glands to provide extra energy for fighting or running away. The heart rate and blood pressure also increase, just as the blood flow to the digestive system and kidneys decreases. This process is largely due to the intensified release of stimulating chemicals, known as #neurotransmitters #epinephrine and #norepinephrine . While this activity is critical for survival, those who have chronic activation of the SNS often develop #anxiety, #insomnia , heart racing or disease (heart failure), and adrenal #fatigue . They also have “goose bumps” more frequently than other types and tend to do best in warmer weather. A Sympathetic Dominant Nervous System often leads to significant gastro-intestinal issues due to the poor #digestion of meats and fats. These folks often feel as though food "sits like a rock in my gut". Due to the rising levels of Norepinephrine (the body’s flight or fight neurotransmitter), digestion shuts down to reserve precious resources for survival. Chronic activation can lead many to feel agitated, jittery, wired, & restless as well as prone to sleep disturbances and anxiety. They may also experience the vicious cycle of the “Wired but tired” sensation when eating an inappropriate diet or taking the wrong supplements, which in their case, is filled with sweets and other junk foods or heavy proteins. When a dysfunctional sympathetic nervous system reigns supreme, one may experience anxiety, stress, or feelings of panic, which should normally only occur in response to a perceived threat. Subsequently, they may overreact to even the mildest of daily troubles.
These individuals often start out thin and active yet poor diets—usually filled with sweets and starchy carbs often lead to later weight gain. When busy or stressed, they frequently forget to eat regularly, if at all. They are often pale, do not tolerate cold weather and tend to have colder hands & feet. Such individuals are often impatient and easily frustrated or angered, yet it appears to quickly pass. They often make for volatile partners and bosses, in that they frequently explode; yet minutes later have already moved on. They are also frequently viewed as “intense,” “aloof,” or “bold,” and have a tendency of “sticking their foot in their mouths” by being too aggressive or forward. Nevertheless, #genetic & environmental factors influence this area considerably.
They are also very driven, ambitious, and motivated people who may excel in academics or in high energy vocations that require multi tasking and social interaction. Many also enjoy a stimulating debate or confrontation (attorneys, politicians, generals). When healthy ... ..more
To learn more about COMT Gene:
Dr. Richard Deth PhD
Dr. Jill James PhD
1) http://www.ucdmc.ucdavis.ed... (2006 lectures, please scroll down for oxidative Stress Lecture as well).
2) http://www.ucdmc.ucdavis.ed... (2010 Lecture Methylation/Oxidative stress). http://www.youtube.com/watc...
Lithium has been known for years to be useful for #bipolar disorder. Despite all that is known about lithium and its impact on biochemical pathways, no one has defined the mechanism by which lithium has its impact on bipolar disorder. It is likely to be an effect on multiple pathways. There are a number of enzymes in the body that are known to be impacted and inhibited by lithium.
Lithium comes together with methylation at #COMT, the enzyme catechol-o-methyl-transferase. COMT breaks down #dopamine and #norepinephrine. Dopamine is a critical #neurotransmitter for motivation, focus and attention, among other functions ... ..more