Genetics Can play a role in Peripheral Neuropathy
The Relationship Between Genetics and Detox (Its’s all about Methylation!)
As you probably know, I believe that regular detoxification is one of the most important health practices any North American should consider. Our increased need to detox is an unfortunate sign of the times. More than 100,000 chemicals are now found in our foods, drugs, personal products and everyday items, with about 1,000 new ones introduced every year. (1) The latest Centers for Disease Control and Prevention (CDC) National Report on Human Exposure to Environmental Chemicals (2015) tested for 265 different industrial chemicals and found increasingly worrisome levels in our blood and urine. (2, 3, 4) The role these chemicals play in multiple forms of cancer is well documented.
More than 100,000 chemicals are found in foods, drugs, personal products and everyday items.
As we’ve said many times, “genes load the gun — environment pulls the trigger.” But, is it possible that we sometimes place unbalanced attention on the environment, and not the genes? We do know that genetics plays a role in one’s ability to detoxify, specifically, through methylation.
What is Methylation?
Even if we eat well, exercise, and try to manage our stress, our detoxification systems are very challenged to keep up, if not completely overwhelmed. One of the body’s main detoxification pathways is methylation, and this can be affected by a genetic mutation called MTHFR.
Perhaps you have heard of methylation or MTHFR, but it’s very likely that, if you’ve studied this in any depth, your brain may have collapsed under the weight of highly technical biochemical explanations. Let’s simplify.
MTHFR is short for methylenetetrahydrofolate reductase, an enzyme that plays key roles in your body’s processing of amino acids and folate (vitamin B9), as well as other biochemical pathways. Methylation is critical for gene expression. Although your genes never change, they can become active or inactive, flipped on or flipped off (through epigenetics), and this is achieved via methyl groups. Methyl groups (a carbon atom attached to three hydrogens) are the body’s messengers, jumpstarting reactions such as turning on a gene or activating an enzyme.
Methyl groups attach to DNA like charms on a charm bracelet. Dysfunctional methylation may result in the silencing of beneficial genes or the expression of detrimental ones, wreaking all sorts of havoc on the body.
Impaired methylation is a factor in cardiovascular disease (5), cancer (6, 7), diabetes, asthma, chronic miscarriage (8), neurological disorders including Alzheimer’s and multiple sclerosis (9), and autism. (10) The science is still in its infancy, but evidence suggests these mutations play roles in a staggering number of diseases—MTHFR.net lists 64 thus far. (11)
Methylation is required for effective detoxification. Our bodies, especially our livers, use methylation to convert toxins into water-soluble compounds so they can be excreted. When these toxins build up in our tissues—heavy metals for example—our risk for cancer and other serious health problems ramps up. Therefore, you can see how any mutation in the MTHFR gene could create a serious weakness in one’s body when it comes to detoxification–and many other vital health functions.
12 Facts about MTHFR
MTHFR is an enzyme used in an important biochemical process called methylation. The MTHFR gene produces the MTHFR enzyme, but genetic mutations can inhibit this gene’s function. Estimates vary, but it’s believed that 40 to 60 percent of the general population has one or more MTHFR mutations.
Methylation converts folate and folic acid into the active or “methylated” form your body can use: methylfolate or 5-MTHF.
Methylation requires adequate vitamin B12 in its methylated form, methylcobalamin. This is one more reason why Vitamin B12 is so vital to your health–specifically detox.
Methylation is involved in more than 200 enzymatic reactions and occurs billions of times per second in our cells, contributing to detoxification, DNA repair, energy production, mood balancing, glutathione production, and control of inflammation.
In addition to folate and other deficiencies, MTHFR mutations may contribute to elevated homocysteine levels because methylation is required for converting homocysteine into methionine.
Elevated homocysteine can damage your blood vessels and increase your risk for coronary artery disease.
Individuals with MTHFR mutations may have problems detoxifying, therefore may benefit from increased detoxification support.
Not everyone with MTHFR mutations is compromised. Other factors come into play such as diet and lifestyle, toxic exposures, stress management, and other genetic and epigenetic factors. The good news is, MTHFR testing is now available (read further).
MTHFR plays a critical role in folate metabolism, which has implications for every process in your body that relies on folate (vitamin B9)–of which there are many.
Folic acid is a widely used synthetic version of folate and should be avoided. Many people are unable to convert folic acid into folate—particularly those with MTHFR mutations. Recent studies link folic acid in processed foods and supplements to various forms of cancer. (12, 13, 14)
Whether or not you have MTHFR mutations, the best dietary approach is to consume plenty of naturally folate-rich foods. Folate comes from the word foliage (think “leafy greens”).
If your diet is good but your folate level remains low, you might benefit from supplementing with the methylated form of folate, and possibly methylated B12 as well.
Sorting Out Folic Acid, Folate and Folinic Acid
In order to appreciate the importance of the roles folate and methylation play in your health, you must first understand the basic differences between folate, folic acid and folinic acid.
Folate is the natural form of vitamin B9 found in foods, especially vegetables and legumes. Folate is required by your body during rapid cell division and is essential for normal growth and development and proper nerve and brain function.
Folinic acid is another form of vitamin B9 occurring naturally in foods, which is stable, metabolically active, and does not require enzymatic conversion in your body. Folinic acid is especially supportive of DNA base production, so it’s beneficial when cell turnover and DNA production demands are high, such as when repairing gut lining or regenerating skin and hair. There are some reports that folinic acid supplementation helps mitigate hair loss during chemotherapy.
Unlike folate and folinic acid, folic acid is a synthetic compound used in low quality supplements and fortified foods such as breads, cereals, pasta and “enriched” flour. Recent studies suggest folic acid may be harmful in the high levels people are consuming today, particularly in people with MTHFR mutations who lack the ability to convert it to folate. Unconverted folic acid attaches itself to the same receptors the body uses to absorb folate, effectively blocking folate absorption.
MTHFR in Plain English
Genetics is a profound science, but it need not be complicated, for the sake of this article.
Genomic mapping has revealed there are about 25,000 genes in the human organism, all interacting in complicated and often mysterious ways. We have a variety of genetic mutations that influence our health, also termed polymorphisms, defects or variations. It’s still a matter of debate as to how these genetic variations can be “managed” to optimize health on a day to day basis. We now know that our DNA is continuously changing, in terms of genes being flipped on and off.
When it comes to the MTHFR gene, there are about 30 known mutations, but two are particularly well-studied: C677T and A1298C. These number-letter designations are known as SNPs (snips). (15, 16) You can think of SNPs as sort of a genetic “latitude and longitude”—in other words, they are codes pinpointing the location of an abnormality in your genetic sequence. This is important because the MTHFR gene is made up of 20,373 base pairs. The numbers represent the base pair position and the letters represent the allele, or the place on the chromosome where the gene occurs.
MTHFR mutations are classified as heterozygous or homozygous. In genetics, hetero- and homo- refer to the two alleles on the gene. If you have just one mutant allele on the MTHFR gene, you’re said to have a heterozygous mutation. If you have two copies of the same mutant allele, you have a homozygous mutation. Some people even have a “compound heterozygous,” which consists of one mutant allele on two base positions.
The number and types of mutations help determine how strongly you will be affected. Heterozygous MTHFR mutations seem to have only minor influences on health, whereas homozygous mutations are more significant, for example:
Individuals with homozygous C677T mutations tend to have significantly lower folate levels than those with heterozygous C677T.
Those with homozygous or compound heterozygous mutations are more likely to have elevated homocysteine levels (and therefore have higher cardiovascular risk).
Homozygous MTHFR mutations are thought to inhibit MTHFR enzyme function by as much as 70 percent.
It’s important to reiterate that having a mutation does not necessarily mean you will develop a disease. There are mitigating factors such as diet, lifestyle, stress, and other factors that enter into the mix. We DO know that if you have a MTHFR mutation and your diet is low in folate, you are more likely to develop folate deficiency than someone with the same mutation who gets plenty of folate in their diet.