An Overview Of Methylation
Methylation, simply put, is the addition of methyl (CH3) group to a molecule - it can be an enzyme, a hormone, or the DNA itself.
The methylation cycle encompasses a bunch of biochemical reactions that transfer methyl groups from one molecule to another - essentially like a game of passing the parcel.
Methylation is important for several functions in the body, including:
- Detoxification
- Growth and development
- Hormone metabolism
- DNA expression
- Neurotransmitter (brain chemicals) balance
Methionine And Homocysteine
An important reaction in the methylation cycle is the conversion of an amino acid called homocysteine to another amino acid called methionine.
The buildup of homocysteine in the body has been associated with several health conditions like:
- Heart diseases
- Certain types of cancer
- Stroke
- Blood vessels disorders
- Chronic kidney disease
- Schizophrenia
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Important Steps In The Conversion Of Homocysteine To Methionine
- The MTHFR enzyme converts inactive vitamin B9 (folate) to active folate called 5-MTHF.
- 5-MTHF then donates a methyl group to homocysteine to convert it to methionine. This reaction is mediated by the methionine synthase enzyme and vitamin B12.
- The cycle gets completed with methionine getting converted back into homocysteine, releasing SAMe, a very important methyl donor, in the process.
Genes Covered In Xcode’s MTHFR And Methylation Genetic Test Panel
| Gene | Description |
| MTHFR | The MTHFR gene produces the methylenetetrahydrofolate reductase enzyme. It converts folate into its active form. This is crucial for converting the harmful amino acid homocysteine to methionine, which is safe for the body. Two common variants in this gene are C677T and A1298C, which can lead to MTHFR enzyme activity and increased homocysteine levels. |
| MTRR | The MTRR gene produces the methionine synthase reductase enzyme. It plays a role in activating another enzyme, methionine synthase (MTR). The MTR enzyme directly converts homocysteine to methionine. Variants in the MTRR gene can result in impaired reactivation of MTR, leading to a buildup of homocysteine and reduced methionine levels. |
| MTR | The MTR gene produces the methionine synthase enzyme. This enzyme is responsible for the final step in the conversion of the amino acid homocysteine to methionine. Variants in the MTR gene can result in a buildup of homocysteine in the blood and decreased availability of methionine and SAM, which can disrupt DNA methylation and gene expression. |
| MTHFD1 | The MTHFD1 gene produces the methylenetetrahydrofolate dehydrogenase 1 enzyme that catalyzes the 3-step folate metabolism pathway. This is an important step in generating methyl donors for the methylation cycle. Variants in this gene can alter the levels or activity of the enzyme produced, and can lead to disturbances in the methylation cycle. |
| CBS | The CBS gene produces the cystathionine beta-synthase enzyme. It is crucial in the transsulfuration pathway, a branch of the methylation cycle. The CBS enzyme catalyzes the first step of converting homocysteine into another amino acid called cysteine. Variants in the CBS gene can impair this conversion, leading to increased homocysteine levels. |
| AHCY | The CPS1 gene produces the carbomyl phosphate synthetase enzyme. It plays an important role in the urea cycle which converts excess ammonia in the body to urea. This cycle regulates neuronal health and oxidative stress. Variants in the CPS1 gene have been associated with higher homocysteine levels. However, the mechanism behind this is unclear. |
| CPS1 | The CPS1 gene produces the carbomyl phosphate synthetase enzyme. It plays an important role in the urea cycle which converts excess ammonia in the body to urea. This cycle regulates the neuronal health and oxidative stress. Variants in the CPS1 gene have been associated with higher homocysteine levels. However, the mechanism behind this is unclear. |
| BHMT | The BHMT gene produces the betaine-homocysteine S-methyltransferase enzyme. It transfers a methyl group from a compound called betaine to homocysteine to convert it into methionine. Methionine is then converted into SAMe. Variants in the BHMT gene can affect the enzyme levels or activity and may result in higher levels of homocysteine. |
| NOS3 | The NOS3 gene produces the endothelial nitric oxide synthase (eNOS) enzyme. It is responsible for the production of nitric oxide in the endothelial cells. Variations in the NOS3 gene have been associated with higher homocysteine levels. The hypothesis is that nitric oxide modulates homocysteine levels through an effect on folate catabolism. |
| SHMT | The MAT1A gene produces the methionine adenosyltransferase enzyme. The two forms of the enzyme, MATI and MATII, help break down methionine into S-adenosylmethionine, a main methyl donor. Variants in the MAT1A gene influence homocysteine levels. Some studies report increased levels in resposne to dietary fat intake in those who have a MAT1A variant. |
| CTH | The CTH gene produces the cystathionine-gamma-lyase enzyme. It catalyzes the conversion of cystathionine to cysteine in the last step of the transsulfuration pathway. Variations in the CTH gene can lead to plasma elevation of total homocysteine levels. This can lead to a condition called cystathioninuria, an inborn error of metabolism. |
| MAT1A | The MAT1A gene produces the methionine adenosyltransferase enzyme. The two forms of the enzyme, MATI and MATII, help break down methionine into S-adenosylmethionine, a main methyl donor. Variants in the MAT1A gene influences homocysteine levels. Some studies report increased levels in resposne to dietary fat intake in those who have a MAT1A variant. |
| GNMT | The GNMT gene produces the glycine N-methyltransferase enzyme. It transfers a methyl group from SAM to glycine to generate S-adenosylhomocysteine (SAH) and sarcosine. Variations in the GNMT gene can result in lower levels of the enzyme, which may cause homocysteine levels to build up. However, this effect can be countered with folate intake. |
| MAOA | The MAO-A gene produces the monoamine oxidase A enzyme. It is an integral enzyme in the regulation of brain chemicals like dopamine, norepinephrine, and serotonin. For MAO-A to function well, it needs to undergo optimal methylation. Undermethylation of MAO-A can result in dysregulation of brain chemicals and has been associated with panic disorder. |
| COMT | The COMT gene produces the catechol-o-methyltransferase enzyme. This enzyme transfers a methyl group from SAMe (a by-product of homocysteine to methionine conversion) to brain chemicals like dopamine and norepinephrine. Variants in the COMT gene may lead to imbalances in the brain chemicals, increasing the risk of certain psychiatric disorders. |
How To Interpret Your Xcode MTHFR And Methylation Genetic Test?
Here, we will break down the key sections of your report and provide answers to common questions.
Overview of the Report
The MTHFR report includes:
- MTHFR gene status
- Information on other important methylation genes
- Specific genetic variants
- Personalized recommendations
Understanding Your Results
Prominent MTHFR SNPs
The report focuses on the following SNPs within the MTHFR gene:
- C677T (rs1801133): A common variant that can significantly impact folate metabolism and homocysteine levels. Homozygous individuals (TT) may have higher homocysteine levels and may require more significant dietary adjustments.
- A1298C (rs1801131): Another variant affecting the enzyme's function. While its impact on homocysteine levels is less pronounced than C677T, it can still influence methylation processes and folate metabolism.
Depending on the genotype for these SNPs, your overall results are calculated. If the bar graph points to green, you likely have normal MTHFR enzyme levels.
If it’s in orange, you may need to up your dietary vitamin B9 intake.
If it’s in red, you may require a methylfolate supplement (which should be taken only after consulting your doctor).
Other Important Methylation Genes
Other than MTHFR, several important genes regulate the methylation process in the body. This section provides information on their activity.
The colored circles around the genes denote how well they function.
Red and orange indicate the presence of risk alleles that interfere with the gene functioning and are associated with lower levels or activity of the enzyme produced by that particular gene.
Green denotes a normal functioning gene and hence is associated with normal enzyme levels/activity.
SNPs Analyzed
“SNPs ANALYZED" provides a comprehensive overview of the specific Single Nucleotide Polymorphisms(SNPs) present in the important methylation genes, which could affect the level/activity of the enzymes produced.
- No copy of variant allele - Green
- One copy of variant allele - Orange
- Two copies of variant allele - Red
Sometimes, one copy of the variant allele may be shaded in green; this is because, in some SNPs, only two copies of the variant allele will likely have a negative effect. Single copy is still considered normal.
The * symbol indicates that the original SNP we analyzed was not found in your data, so a proxy SNP was used. Proxy SNPs are variants present very close to the original SNP and, hence likely will have the same effect on the gene activity.
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What Supplements Should I Take Based On The MTHFR Report?
Based on your genetic variants, the following supplements may be beneficial:
- Methylfolate: Especially if you have the C677T or A1298C variants, as this form of folate is better utilized by individuals with MTHFR mutations.
- Vitamin B12 (Methylcobalamin): Works synergistically with methylfolate to support methylation and reduce homocysteine levels.
- Vitamin B6: Helps in the conversion of homocysteine to cysteine, lowering homocysteine levels.
- Vitamin D: Important for overall health and may interact with B vitamins in supporting methylation.
Disclaimer
Before starting any new supplement regimen, it is crucial to consult with a healthcare provider. These recommendations are based on genetic predispositions and should be tailored to your individual health needs and circumstances. Your healthcare provider can help determine the appropriate dosages and monitor for any potential interactions with medications or other supplements you may be taking.
Other Frequently Asked Questions
How Often Should I Review My Genetic Information?
It is good practice to review your genetic information annually or when you experience significant health changes.
Can I Share My Results With My Healthcare Provider?
Absolutely. Sharing your report with your healthcare provider can help tailor medical advice and interventions to your genetic profile. In fact, we recommend taking the help of your doctor to interpret all our reports.
How Accurate Are These Results?
Genetic testing is highly accurate, but it is one piece of your overall health picture. It is essential to consider these results alongside other medical evaluations.
Conclusion: MTHFR And Methylation Genetic Test
Your MTHFR report is a powerful tool for understanding your genetic predispositions and taking proactive steps toward better health. Use this guide to navigate your results and make informed decisions about your lifestyle and healthcare. If you have further questions or need assistance, don't hesitate to reach out to a healthcare professional.
