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.

How efficiently the body clears mercury depends on detox genes, especially the glutathione S-transferases GSTM1, GSTT1, and GSTP1, plus metallothionein and selenium pathways. This article explains how mercury is processed, why null gene variants raise retention and risk, its health effects, and how pathway-level genetic insight adds context.

The FABP2 gene encodes fatty acid binding protein 2, and its Ala54Thr variant (rs1799883) has been linked to insulin sensitivity, triglycerides, BMI, and metabolic syndrome. This article explains what the FABP2 trait does, which conditions research associates with it, and how to use that pathway-level insight with your provider.

GCH1 builds tetrahydrobiopterin (BH4), the cofactor behind nitric oxide production and pain signaling — which is why one gene shapes both cardiovascular resilience and pain sensitivity. This spotlight explains what GCH1 does, what the research shows, and how the Precision Peptide Genetic Test maps it at the pathway level.

Genes shape whether your blood clots too readily or bleeds too easily. Platelet-receptor variants in ITGB3 (rs5918) and P2RY12, plus clotting-factor variants like Factor V Leiden (F5) and prothrombin (F2), influence this balance. Learn the biology and how pathway-level genetic insight adds context.

The SULT1A1*2 variant (Arg213His, rs9282861) lowers activity of a key sulfation enzyme in phase II detoxification, affecting how the body processes hormones, dietary phenols, and chemicals. This article explains what SULT1A1 does, what the *2 allele means, and how pathway-level genetic insight adds context.

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.

Pulmonary arterial hypertension (PAH) has clear genetic drivers: BMPR2 mutations appear in 70 to 80 percent of heritable cases, alongside ACVRL1, ENG, EIF2AK4, and other genes. This article explains the genetic risk factors, incomplete penetrance, family screening, and why early detection improves outcomes.

NAFLD, now called MASLD, affects roughly 25% of adults, and genetic variants in PNPLA3 (rs738409) and TM6SF2 shape how the liver stores fat. This article explains the key named genes, how they interact with diet and weight, and where pathway-level genetic insight fits into a provider-led plan.

Painful bladder syndrome (interstitial cystitis) involves a compromised bladder lining, immune activity, and inherited pain sensitivity. Genes like COMT (rs4680, Val158Met) shape how intensely pain registers. This article explains what research suggests about the genetics of PBS and how pathway-level insight informs a provider conversation — never a diagnosis.

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.

IgA nephropathy (Berger's disease) is the most common primary glomerular kidney disease, and genetics shapes both risk and course. This article explains the four-hit model, key risk loci in the HLA region and complement genes CFHR3/CFHR1, TNFSF13, and DEFA, and its health effects.

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.

The NOS3 gene builds eNOS, the enzyme that makes nitric oxide to keep blood vessels flexible and healthy. Learn how variants like Glu298Asp and -786T>C shift cardiovascular risk, what research shows about endothelial function, and how pathway-level genetic insight informs provider conversations.

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.

PCSK9 gene variants shape how efficiently your liver clears LDL cholesterol, influencing lifetime heart disease risk. This article explains gain- and loss-of-function variants, how PCSK9 works alongside LDLR and APOB, and how pathway-level genetic insight adds context to a standard lipid panel.

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.

Itching, or pruritus, has real genetic roots: FLG variants weaken the skin barrier and drive eczema-related itch, while HNMT and DAO genes shape histamine sensitivity and IL-31 fuels inflammatory itch. This article explains the pathways behind chronic itch and what pathway-level genetic context can add.

Myocarditis risk can involve genetic traits in heart-muscle genes like DSP and TTN and immune-region genes such as HLA. Learn what the research shows about inherited susceptibility, why genetic insight cannot prevent or diagnose the condition, and how pathway-level context informs a cardiologist conversation.

Jaw pain intensity and temporomandibular disorder (TMD) risk are shaped by inherited pain-processing genes — most notably COMT and its Val158Met variant (rs4680). Research including the OPPERA study links certain COMT haplotypes to heightened pain sensitivity. Learn what your genetics reveal about jaw pain.

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.

Gene variants in detoxification pathways — including GSTM1, GSTT1, GSTP1, and PON1 (rs662) — shape how the body processes environmental chemicals. This article explains what genetics can and cannot tell you about glyphosate sensitivity, why the science is early, and practical steps to reduce exposure regardless of your DNA.