Mastocytosis is a rare disorder in which excess mast cells release histamine, causing allergic-type symptoms. Most systemic cases trace to the acquired KIT D816V mutation, while HNMT and DAO variants shape histamine handling. This article covers symptoms, common triggers, and pathway-level genetic context.

The AOC1 gene builds diamine oxidase (DAO), the enzyme that clears dietary histamine. Variants like rs10156191 are linked to lower DAO activity, higher histamine, and a lower migraine threshold. Learn how pathway-level genetic insight puts your histamine biology in context.

Spleen disease often traces to inherited conditions affecting red blood cells or metabolism, including hereditary spherocytosis (ANK1, SPTB), sickle cell disease (HBB), and Gaucher disease (GBA). This article explains what the spleen does, key symptoms, genetic and non-genetic risk factors, and how pathway-level genetic insight fits alongside medical evaluation.

Multiple sclerosis is polygenic: more than 200 variants shape susceptibility, led by HLA-DRB1*15:01, with IL7R, IL2RA, and vitamin D pathway genes adding immune-regulation context. Genetics loads the dice alongside Epstein-Barr virus and vitamin D. Learn how these named variants work — educational insight, not diagnosis.

Neutropenia — a low neutrophil count below 1,500 cells per microliter — has causes ranging from harmless to serious. This guide explains the symptoms, common triggers, and named genetic factors like the ACKR1 Duffy variant, ELANE, and MTHFR that shape your baseline neutrophil biology.

Actinic keratoses are precancerous, sandpaper-rough patches caused by years of UV exposure, and a share of untreated lesions can progress to squamous cell carcinoma. Inherited traits matter too: MC1R shapes how easily you burn and UV-induced TP53 mutations drive the lesions. Learn the signs, prevention, and genetic factors.

C. difficile infection depends on exposure and a disrupted microbiome, but immune-signaling genetics shape susceptibility and recurrence. This post explains how variants in IL8 (rs4073) and TLR4 influence the inflammatory response to C. diff toxins, what the research shows, and why prevention stays environmental.

Why do some people get hit harder by colds? Named gene variants such as CDHR3 (rs6967330), IFITM3, and IFNL4 influence rhinovirus entry and antiviral defense. Learn the biology of cold severity, what the research shows, and how pathway-level genetic insight adds educational context.

Gut inflammation is shaped by gene variants including NOD2, IL23R, ATG16L1, TNF, and IL10, which govern how your immune system senses bacteria and how your intestinal barrier holds together. This article explains what those genes do, what research shows, and how pathway-level genetic insight provides context for a provider conversation.

Ankylosing spondylitis, an inflammatory arthritis of the spine, has one of the strongest genetic links in rheumatology: HLA-B27, alongside ERAP1 and the IL-23/IL-17 pathway. This article explains those genetic factors, why most HLA-B27 carriers never develop the disease, and the provider-led role of testing.

Psoriasis is strongly heritable, and genetic markers including HLA-C*06:02, IL23R, and IL12B shape susceptibility through the IL-23/Th17 immune pathway. Learn how these variants raise risk, why triggers still matter, and how pathway-level genetic insight informs a personalized conversation with your provider.

IL1B encodes interleukin-1 beta, a powerful inflammatory signal, and variants such as rs16944 and rs1143634 shift how much your body produces. Research links high-inflammation genotypes to gastric and gum conditions when a trigger is present. This article explains the pathway and how genetic insight informs a provider conversation.

The HLA-DOB gene and the surrounding HLA class II region shape immune recognition and are linked to autoimmune conditions including rheumatoid arthritis and type 1 diabetes. This article explains what HLA-DOB does, how HLA-DRB1 and HLA-DQ contribute, and why these genes offer pathway-level context rather than a diagnosis.

IgA nephropathy is an immune-mediated kidney disease with a strong hereditary component involving C1GALT1, HLA-DQ, and complement genes like CFHR3. This article explains the genetic factors, what research shows, and how pathway-level insight supports informed conversations with your care team.

IL-23R gene variants shape the IL-23/Th17 immune pathway that drives inflammation. The R381Q variant (rs11209026) is linked to lower autoimmune risk. This article explains what IL-23R does, what the research shows across inflammatory conditions, and how pathway-level genetic insight adds context — never a diagnosis.

Sarcoidosis is an inflammatory condition in which the immune system forms granulomas, most often in the lungs. This article explains its symptoms, why it clusters in families, and the BTNL2, HLA-DRB1, and ANXA11 gene variants tied to susceptibility, plus what pathway-level genetic insight can and cannot tell you.

The ABCB1 (MDR1) gene encodes P-glycoprotein, a cellular transporter that some researchers are studying in relation to chronic Lyme disease and PTLDS. This article explains what ABCB1 does, its role in clearance and barrier pathways, why the evidence is still early, and why medication decisions belong with a provider.

NLRP3 gene variants including rs10754558 and the Q705K change rs35829419 influence the inflammasome, the immune alarm system tied to gut inflammation in inflammatory bowel disease. Learn what the research shows about NLRP3, CARD8, and NOD2, and how the Precision Peptide Genetic Test maps inflammation pathways.

Genital herpes outcomes vary widely, and host immune genes help explain why. HLA alleles and TLR3 shape how the body controls HSV, while research near C21orf91 links genetics to outbreak frequency. This article covers the named genes, evidence-based prevention, and where pathway-level genetic insight fits in.

Genetic factors in HPV susceptibility center on the HLA immune genes — HLA-DRB1 and HLA-DQB1 — plus TMC6/TMC8, which influence how efficiently the immune system clears the virus. This article explains those associations and the proven protection methods (vaccination, screening) that matter far more than any single variant.

Ringworm is a dermatophyte fungal infection, and susceptibility is shaped by immune genes like CARD9 and skin-barrier genes like FLG. This article explains the genetic factors behind recurrent fungal infection, the innate immune pathway that detects fungi, and preventive habits that lower everyday risk.

The erythrocyte sedimentation rate (ESR) is a non-specific inflammation marker shaped partly by genes like IL6, CRP, and FGB. Learn what ESR measures, how it differs from CRP, why your baseline can vary, and how the PlexusDx Precision Peptide Genetic Test adds pathway-level genetic context to the biology behind inflammatory signals.

About 90% of ALS is sporadic and 10% is inherited. This article explains how genes including C9orf72, SOD1, TARDBP, and FUS drive motor-neuron degeneration in Lou Gehrig's disease, the difference between familial and sporadic cases, and why genetic testing belongs with a neurologist and genetic counselor.

HLA-B27, a variant of the HLA-B gene, is the best-known genetic marker in spondyloarthritis — linked to ankylosing spondylitis, reactive arthritis, and acute anterior uveitis. Learn what carrying it means, how the ERAP1 gene interacts with it, and why most carriers never develop disease.