Your Anxiety Feels Constant, Your Genes May Be Why.

COMT (catechol-O-methyltransferase) is an enzyme that breaks down dopamine, norepinephrine, and epinephrine after they’ve done their job. Think of it as the cleanup crew for stress hormones. When these neurotransmitters are actively working, they keep you alert, focused, and ready to respond. But once the threat passes, you need to clear them out quickly so your nervous system can relax again.

The Val158Met variant in COMT comes in different forms. Some people have the Val variant, which clears these hormones quickly. Others have the Met variant, which clears them slowly. Roughly 25% of people with European ancestry are homozygous for the slow-clearing version. If you carry the slow-clearing variant, stress hormones linger in your system long after the stressful event is over. Your nervous system never fully downshifts.

You notice this as a constant undercurrent of tension. Your heart rate stays elevated. Your thoughts race even when nothing is happening. You startle easily. You feel wired and exhausted at the same time. Caffeine makes it worse because it further increases dopamine and norepinephrine. Your nervous system is essentially flooded with the gas pedal pressed down.

SLC6A4 encodes the serotonin transporter protein, which sits on nerve cells and recycles serotonin back into the neuron after it’s been released. Serotonin is your brain’s primary calming chemical. When serotonin signaling works well, you feel content, resilient, and able to bounce back from stress. But recycling has to be efficient. If serotonin stays in the gap between neurons too long, or if it gets reabsorbed too quickly, the signal gets disrupted.

The 5-HTTLPR variant has a short allele and a long allele. Roughly 40% of people carry at least one short allele. The short allele produces fewer transporter proteins, which means serotonin recycling is slower and less efficient. Your brain struggles to maintain steady serotonin levels, especially under stress.

People with short alleles report that their anxiety feels reactive and unpredictable. Small triggers feel huge. You might feel fine one moment and overwhelmed the next. Social situations are exhausting. Your mood feels fragile. You don’t bounce back from setbacks the way others seem to. You might feel depressed alongside your anxiety. This is what poor serotonin recycling feels like from the inside.

MAOA (monoamine oxidase A) is an enzyme that breaks down serotonin, dopamine, and norepinephrine once they’ve finished signaling. It’s part of the normal lifecycle of these neurotransmitters. But the speed at which MAOA works matters enormously. If it works too quickly, neurotransmitters don’t stick around long enough to have their full calming effect. If it works too slowly, levels fluctuate unpredictably.

The MAOA-L (low activity) variant is carried by roughly 30 to 40% of males and fewer females. Low-activity MAOA means these neurotransmitters stick around longer, leading to fluctuating levels and heightened emotional reactivity. Your neurotransmitter levels aren’t stable; they’re more like a seesaw.

You experience this as emotional volatility. You might feel anxious one moment, then fine the next. Your mood swings feel quick and hard to predict. You have strong reactions to minor things. Anger comes easily. You might feel impulsive or do things you regret when stressed. Relaxation doesn’t feel natural because your neurochemistry is fundamentally less stable. This is what slow monoamine breakdown feels like.

FKBP5 is a protein that regulates how sensitive your glucocorticoid receptors are to cortisol. Think of glucocorticoid receptors as the switches that turn off the stress response once the threat has passed. When cortisol binds to these receptors, it tells your nervous system, “Okay, crisis over, stand down.” FKBP5 controls how easily that switch flips.

The rs1360780 variant in FKBP5, found in roughly 30% of the population, impairs glucocorticoid receptor sensitivity. This means your brain doesn’t recognize the cortisol signal as effectively, so your stress response stays activated longer than it should. Even after a stressful event ends, your cortisol levels remain elevated and your nervous system stays in fight-or-flight mode.

You live with a sense of persistent threat. Your body doesn’t feel safe easily. After a stressful day, you can’t seem to unwind even hours later. You might sleep poorly because your nervous system won’t fully relax. You might have a startle reflex that’s too strong. You feel hypervigilant. Stress accumulates because you can’t recover properly between events. By the end of the week, you’re completely depleted.

BDNF (brain-derived neurotrophic factor) is a protein that helps your brain adapt and rewire. It’s essential for learning, memory formation, and emotional recovery. When you go to therapy and rewire anxious thought patterns, BDNF is doing the physical work in your brain to make those new pathways stick. Without sufficient BDNF, your brain gets locked into anxious patterns because it can’t form new ones easily.

The Val66Met variant in BDNF, carried by roughly 30% of people, reduces BDNF secretion. Less BDNF means your brain has reduced ability to rewire itself, especially in response to stress or therapy. You’re literally less able to neuroplastically escape from anxiety patterns.

You might notice that therapy helps other people but not you as much. You feel stuck in the same anxious loops despite understanding them intellectually. You struggle to learn new coping skills or break old habits. Exercise doesn’t seem to boost your mood the way it does for others. Your brain feels less flexible, more locked into old patterns. This is what reduced neuroplasticity feels like.

GAD1 encodes glutamic acid decarboxylase 1, an enzyme that synthesizes GABA (gamma-aminobutyric acid). GABA is your nervous system’s primary brake pedal. It’s the neurotransmitter that says “slow down” and “calm down.” When GABA is working well, you can activate it to settle your nervous system. When it’s not, you’re trying to calm down without the neurochemical tools to do it.

GAD1 has various SNPs, and roughly 20 to 30% of people carry variants that reduce GAD1 activity. Less GAD1 means lower GABA production, which means your nervous system has less inhibitory tone and is naturally more activated. You’re trying to drive with a broken accelerator but also a weak brake.

You feel like your nervous system has a low ceiling for calm. You can’t relax even when nothing is happening. Your mind races. You feel restless and fidgety. Deep relaxation feels nearly impossible because your brain just doesn’t have enough GABA to create that state. You might have a history of insomnia or racing thoughts at night. Alcohol might temporarily help because it enhances GABA, but that’s not a solution. You’re just borrowing GABA from future hours.