MTHFR converts dietary folate into the active form the methylation cycle requires. The C677T (rs1801133) and A1298C (rs1801131) variants reduce enzyme activity by 30–65%, limiting DNA repair, homocysteine clearance, and epigenetic age regulation. The Precision Peptide Genetic Test analyzes MTHFR as part of 17 Longevity & Aging insights spanning 14 pathways, 49 peptides, and 150+ genetic insights.

APOE comes in three allele variants — e2, e3, and e4 — that produce meaningfully different cardiovascular and cognitive aging trajectories. It is the most studied aging-related gene in human genetics. The Precision Peptide Genetic Test analyzes APOE as part of 17 Longevity & Aging insights within a panel spanning 14 pathways, 49 peptides, and 150+ genetic insights.

FOXO3 is the most replicated longevity gene in science — variants are consistently associated with exceptional lifespan across independent centenarian cohorts in Japan, Italy, and the United States. The Precision Peptide Genetic Test analyzes FOXO3 as part of 17 Longevity & Aging insights within a panel spanning 14 pathways, 49 peptides, and 150+ genetic insights.

Paresthesia — tingling, numbness, and pins-and-needles — is influenced by genetics, including MTHFR variants affecting B12 and folate metabolism, SCN9A variants shaping nerve firing, and PMP22 affecting myelin. This article explains the genetic factors in nerve health and how genetic insight supports an informed provider conversation.

Albumin, the most abundant blood protein, has a genetically influenced baseline. The ALB gene, the GCKR variant rs1260326, and FCGRT-driven albumin recycling all shape your level. Learn what these named gene variants do and why pathway-level genetics complements, but never replaces, a provider's reading of your labs.

Susceptibility to Group A Streptococcus is shaped by immune genetics, especially HLA-DRB1 and HLA-DQB1 class II genes tied to rheumatic fever risk, plus innate immune variants. This article explains the genetic factors behind strep infection and complications, and the modifiable habits that lower everyday risk.

AST is a key blood marker of liver health, and genetics helps explain why it varies — the PNPLA3 I148M variant raises liver-fat storage independent of alcohol. This article covers what AST measures, the roles of PNPLA3, TM6SF2, and HFE, and how genetic and lifestyle context work together.

The GABA-A receptor is the brain's main calming gateway, built from subunits encoded by GABRA2, GABRA6, and GABRG2, with GABA made by GAD1 and GAD2. This article explains how these genes shape anxiety, sleep, and the excitatory-inhibitory balance tied to healthy neural aging.

Growth hormone regulates metabolism, body composition, bone density, and tissue repair, and genetics shape how the whole axis behaves. This article explains what GH does, how variants in GHR, IGF1, GHRHR, and FOXO3 influence it, why balance beats maximization, and what pathway-level genetic insight adds.

Age spots (solar lentigines) form where UV meets your pigmentation genetics: MC1R and IRF4 variants decide how readily skin overproduces melanin in the sun. This article explains the genes behind sun spots, the gene-environment link, and evidence-based prevention and management.

NAT2 slow acetylator status — driven by variants like NAT2*5 (rs1801280) and NAT2*6 (rs1799930) — means your liver processes certain aromatic amines more slowly. Research links it to exposure-related risks such as bladder cancer in smokers. Learn what slow acetylator status means and how genetic insight adds pathway-level context.

The MTRR gene variant rs1801394 (A66G) modestly reduces recycling of vitamin B12 used to keep homocysteine in check, and its impact grows alongside MTHFR variants and low B-vitamin status. This article explains what MTRR does, which health associations research supports, and how pathway-level genetic insight informs a provider conversation.

ApoB counts the cholesterol-carrying particles tied to cardiovascular risk, and genetics shapes your baseline. Learn how APOB, LDLR, and PCSK9 variants influence your levels, why ApoB can outperform LDL, and how the Precision Peptide Genetic Test adds pathway-level context alongside a blood test.

The MTHFD1 gene variant rs2236225 (R653Q) subtly shifts folate and choline metabolism, raising the importance of nutrient status — especially in pregnancy. This article explains what the variant does, its studied health associations alongside MTHFR and PEMT, and how diet and a provider can support the methylation pathway.

Leg swelling, or edema, reflects how fluid moves through your veins, tissues, and lymphatic system. Named gene variants such as FOXC2, FLT4, and Factor V Leiden (F5) shape inherited tendencies. Learn the biology, what research shows, and how pathway-level genetic insight adds context.

The PEMT gene controls how your body makes choline, and common variants like rs7946 can raise your dietary choline needs. This article explains PEMT function, health risks of low choline, related methylation genes MTHFD1 and MTHFR, and how genetic insight informs your nutrition.

Cystatin C is a sensitive, muscle-independent marker of kidney filtration, and the CST3 gene helps set your baseline. This article explains what cystatin C measures, how it compares to creatinine, the genes behind kidney biology, and how pathway-level genetic insight adds proactive context.

SOD3 encodes the antioxidant enzyme that defends tissue outside your cells, and its R213G variant (rs1799895) changes how it binds vessel and lung tissue. This article explains SOD3's role in oxidative stress, the longevity gene network including SOD2 and FOXO3, and what genetic insight adds.

Sinus congestion has a substantial genetic component — variants in HNMT, AOC1, and IL13 shape histamine clearance and nasal inflammation. This article explains the genetic factors behind chronic congestion, what pathway-level insight can and cannot tell you, and how to bring that context to a qualified provider.

Biological age estimates how old your body actually is, and it can run lower than your chronological age. Genes like FOXO3 (rs2802292) shape longevity pathways, while lifestyle drives most of the outcome. This article explains the factors behind biological aging and how pathway-level genetic insight adds context.

Women aged 19–50 generally need about 1,000 mg of calcium daily, rising to 1,200 mg after 51. But genes like VDR (rs2228570) and COL1A1 shape how efficiently you absorb and use it. This article explains calcium targets, the genetics of bone density, and how pathway-level insight adds context.

Low blood pressure (hypotension), a reading below 90/60 mmHg, is shaped by genes that regulate your nervous, kidney, and hormonal systems. This guide explains the causes, symptoms, and named genetic factors — ADRB2, AGT, NOS3, AHR, and LRRTM1 — plus evidence-based lifestyle approaches.

Genetics accounts for roughly 40% of the variation in blood calcium levels, driven by genes like CASR, CYP24A1, and GCKR that regulate calcium and vitamin D. This article explains how blood calcium is controlled, the health risks associated with genetic variation, and how to use pathway insight with your provider.

Blood Urea Nitrogen (BUN) reflects kidney filtration, hydration, and protein intake. This guide explains the lifestyle levers — fluids, balanced protein, blood pressure and glucose control — that influence BUN, plus the genetics of kidney health, from the UMOD and APOL1 genes to MTHFR and homocysteine metabolism.

The ADA gene variant rs73598374 lowers adenosine deaminase activity, letting adenosine linger and increasing deep, slow-wave sleep that supports daytime attention. This article explains how ADA links sleep, focus, and immune biology, the ADORA2A caffeine connection, and what genetic insight adds.

The GAD1 gene builds GABA, the brain's main calming neurotransmitter, and its variant rs3749034 has been studied in bipolar disorder, depression, and anxiety. Learn what this SNP does, why one variant never tells the whole story, and how pathway-level genetic insight supports professional care.