This test requires 2 x EDTA tubes of blood and samples must be received in he laboratory within 6 days. Centrifugation of the sample is required.
Normal metabolism of methionine is critical for cellular methylation of DNA, proteins and neurotransmitters. Aberrant methionine metabolism can occur in anyone at any age and is usually associated with genetic or nutritional deficiencies, ageing and exposures to environmental toxins. The Methylation Profile provides a functional assessment of the phenotypic expression of common SNPs (MTHFR, MS, CBS) by evaluating the plasma levels of methionine, cysteine, SAM, SAH, homocysteine and cystathionine, and provides the important "methylation index," a ratio of SAM to SAH.
The test results can appropriately guide nutritional support to improve or normalise methionine metabolism and meliorate or prevent the potential adverse consequences associated with inadequate methylation and transsulfuration capacity.
Conditions associated with untreated, aberrant methionine metabolism include, but are not limited to:
Abnormal neurotransmitter metabolism and psychiatric disorders such as schizophrenia and bipolar disorder
- Neurodegenerative diseases
- Dysregulation of nitric acid homeostasis
- Oxidative stress
- Global under-methylation, synthesis and repair of DNA
- Immune dysregulation/autoimmunity
- Cardiovascular disease
- Congenital heart disease and birth defects
- Impaired endogenous detoxification processes
Methionine is first enzymatically converted to S-adenosylmethionine (SAM), the principal methyl donor for methylation of DNA, RNA, protein, phospholipids, creatinine and neurotransmitters. S-adenosylhomocysteine (SAH) is generated as a product of transmethylation and is hydrolyzed to homocysteine (Hcy) and adenosine through a reversible reaction. SAH is a potent inhibitor of methylation reactions. Efficient removal of adenosine and Hcy is imperative to prevent accumulation of SAH. Hcy is normally removed or recycled by remethylation to methionine through a series of reactions that require 5-methyltetrahydrofolate, B12 and betaine to complete the normal methylation cycle. A low ratio of SAM to SAH is a sensitive indicator of under-methylation. Elevated plasma Hcy is an independent risk factor for cardiovascular disease (CVD). Recent research suggests that elevated SAH may be an even better predictor of risk for CVD.
Transsulfuration: Methionine > Homocysteine > Cysteine
The methionine transsulfuration pathway occurs primarily in the liver and diverts Hcy away from remethylation to methionine toward synthesis of the conditionally essential amino acid cysteine. Homocysteine in the presence of serine and B6 is enzymatically converted to cystathionine and ultimately cysteine. Cysteine is the rate-limiting amino acid in the biosynthesis of quintessential glutathione (GSH). GSH is pivotal in the regulation of intracellular redox homeostasis, oxidative stress, immune function, DNA synthesis and repair, apoptosis and detoxification of metals and chemicals.
Methylation Profile Plasma (TEE16)
Methylation Profile - Plasma including SAM SAH Ratio
Test Type:Blood - plasma
Turn Around Time: 14 days.