When it comes to HRT, there is no one-size-fits-all. I have found after working with women for over 20 years for peri and menopause, that everyone is unique in what doses and types of HRT work for them.
Some women respond perfectly within weeks of implementing HRT, such as estradiol, estriol, and progesterone. They are sleeping better, their brain is back, their mood is lifted, and hot flashes have vanished.
HRT can be amazing for our mood, hair and skin, waistline, memory, sleep, libido, clarity, and focus. Not to mention helping prevent metabolic and chronic diseases, such as heart, brain, and bone health issues.
But some women feel like garbage when starting HRT, struggling with even more weight gain, acne, swollen, tender breasts, bleeding, puffiness/water retention, and extremely moody/emotional. They can become discouraged, thinking they are not candidates for HRT. Then, spend a considerable amount of time trying different types, doses, and ratios of HRT to find the right combination for them.
Plus, while hormones like estrogen do not cause cancer, they can exacerbate cancer. And everyone is worried about cancer, especially breast cancer. This makes women worried about what would happen should they get cancer, and should they even take HRT. Well, like I said, estrogen does not cause cancer.
But our genes can tell us about how we respond to HRT, and whether our hormones could push us toward an increased risk of breast and reproductive cancers. And most importantly, how can we decrease the risk and improve our response to HRT?
Our Genes Can Tell Us:
- How could we respond to HRT
- If HRT or our own hormones are increasing our risk for cancer
- How can we help decrease our risk of estrogen-sensitive cancers
- How can we improve our response to HRT
Now there is so much to genetics, so much more than I can put in my way-too-lengthy articles. But for this article, I am going to introduce three genes that influence how we make estrogen and how our bodies process that estrogen in either a good way or a not-so-good way. I promise not to bore you. The fascinating part is that we can have control over our genes. That is when we know what genes we have.
So, if any of you have a genetic report or one of the classics, like 23andMe, pull it out. However, use the old-school 23andMe, because the more recent versions have removed many snips and genes related to hormones.
Now, many genes influence nearly everything, and I cannot go into them all. But this article, these are the genes I want you to meet:
- CYP 17A1: How much estrogen do I make?
- CYP 1A1: Does my estrogen follow a protective pathway?
- CYP 1B1: Is my estrogen going down a risky route?
Estrogen Metabolites:
Let me take a step back and introduce you to our estrogen metabolites. You need to be aware of these metabolites to understand what our genes are doing.
This is important because it will tell us more about:
- Your response to HRT,
- Why we feel crummy in perimenopause from our own hormones
- Your potential risk for breast, uterine, estrogen-sensitive cancers (from HRT or even our own hormones).
Glinda the Good Witch:
2-OH estrogen is our Glinda. She is protective against breast, uterine, and other estrogen-sensitive cancers. And more of her means less of those wicked perimenopausal and menopausal symptoms.
Elphaba the Wicked Witch:
While misunderstood, Elphaba is our 4-OH estrogen, and in our bodies, it can be truly wicked for increasing the risk of breast and estrogen-related cancers. Not to mention more Elphaba, I mean 4-OH estrogen, means more hormonal symptoms. Think, poor sleep, hot flashes, night sweats, PCOS, fibroids, cysts.
Our goal here is to direct our estrogen to become metabolized into 2-OH estrogen and less to 4-OH estrogen. This is where your genes come in. Your genes will tell us which direction your estrogen is metabolizing to.
Back to Our Players:
- CYP 17A1: How much estrogen do I make?
- CYP 1A1: Does my estrogen follow a protective pathway?
- CYP 1B1: Is my estrogen going down a risky route?
When you examine a genetic report, you will see the name of the gene and two letters; these represent your alleles.
Now, can I complicate it more for you? The letters are part of the SNP (single-nucleotide polymorphism) that is on the gene. Basically, there is the gene, the location of the SNP (called ‘snip’), and your genotype of the SNP, which is two letters.
You receive one letter from Mom and the other from Dad. This is where genetics is tricky; you didn’t ask for the SNPs, you were just handed them. Now our job is to either work with your SNP/genotype to make it work for you.
Genes are just a blueprint. Later, I will show you how to increase your 2-OH estrogen and decrease your 4-OH to help decrease the risk of cancer and better respond to your HRT.
Now the letters on your SNP can be ‘normal/wild-type’ or ‘variant’. Normal is more common and usually more beneficial. But not in all cases is being normal better. I will further explain this when we get to CYP 1A1.
CYP 17A1: How Much Estrogen Do I Make?
Gene: CYP 17A1
SNP: rs6162
Allele combinations: AA, AG, GG
A= normal allele: A is the normal allele.
G = variant allele: Variant is a nice name for something different or not as common. In this case, the G allele will increase the enzymatic activity of this gene, resulting in higher overall estrogen production levels. A person with a GG genotype is likely to have a high level of estrogen. And a person with an AG is going to have increased estrogen production, but more so between the AA and GG. But anyone with a G allele for the CYP17A1 can have a higher risk for:
- PCOS
- Infertility
- Estrogen tissue-sensitive cancers
- Increased menopausal symptoms (when that estrogen goes from high, high to low, low)
CYP 1A1: Going with Glinda–moving toward the protective 2-OH estrogen.
Gene: CYP 1A1
SNP: rs260345
Allele combinations: AA, AC, CC
This is the case where you do not want the ‘normal’ type (A). The A-allele has less enzymatic activity. Less enzymatic activity means less good-Glinda, AKA, less 2-OH estrogen.
If you have one or two A alleles, that means you are making less protective 2-OH estrogen. Hence, you will be making more ‘bad’ 4-OH estrogen.
Or to make a long story short, you need to be careful taking HRT if you have AC and especially if you have AA. Because that estradiol HRT could be increasing your chances of cancer, and could be why you are feeling crummy on it anyway.
The C allele will help upregulate enzymatic activity to increase our ‘good’ 2-OH estrogen. That means redirecting your estrogen into the ‘better/positive/good girl Glinda’ metabolite 2-OH rather than the bad girl 4-OH estrogen. Better reaction to HRT and less risk.
CYP 1B1: Good Girl Gone Bad: Heading in the wrong direction, 4-OH estrogen
Gene: CYP 1B1
SNP: rs1056836
Allele combinations: CC, CG, GG
C is the normal allele. Meaning there is less enzymatic activity, resulting in less conversion of your estrogen into the ‘bad girl’ 4-OH estrogen metabolite.
The G variant can cause high levels of the 4-OH estrogens, which can increase your risk for estrogen tissue cancers, and you could have a negative reaction to HRT. If you carry the G allele variant, you should exercise caution when taking HRT and also take steps to counteract the conversion of our estrogen to the truly wicked estrogen metabolite 4-OH estrogen.