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Makes an enzyme that helps produce a form of folate used in the processing of homocysteine. Common variants are different from rare variants that cause severe MTHFR deficiency.

Makes the methionine synthase enzyme, which uses vitamin B12 in the conversion of homocysteine to methionine.

Helps maintain the activity of methionine synthase, connecting B12-related chemistry with homocysteine metabolism.

NAT2 encodes N-acetyltransferase 2, which helps process certain drugs and other compounds. Combinations of variants can influence acetylation status; one SNP usually does not tell the entire story.

NOS3 encodes endothelial nitric oxide synthase, which helps blood vessels generate nitric oxide, a signal involved in vascular relaxation. This pathway is distinct from a blood pressure measurement or a diagnosis of vascular disease.

NQO1 is the gene name for NAD(P)H Quinone Oxidoreductase 1. Learn what a specific result could mean and what to ask about it.

NR3C1 encodes the glucocorticoid receptor, which helps tissues respond to cortisol and glucocorticoid medicines. Receptor genetics and measured cortisol levels answer different questions.

NR3C2 encodes the mineralocorticoid receptor, which responds to hormones such as aldosterone and helps regulate salt and fluid balance. It is distinct from the NR3C1 glucocorticoid receptor.

NTRK2 encodes TrkB, a receptor involved in responding to neurotrophic signals such as BDNF. These signals support nervous-system function and plasticity. NTRK2 is not a phosphatidylserine absorption transporter.

Makes an enzyme involved in producing phosphatidylcholine, a component of cell membranes. Genetic findings alone do not establish a choline deficiency.

PON1 is discussed in relation to how the body handles some compounds and protects certain fats.

PSEN1 encodes a presenilin protein that participates in gamma-secretase, a protein-processing complex. Some pathogenic variants can cause familial Alzheimer’s disease; a listed common marker is not equivalent to that diagnosis.