Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

The Significance of the GSTP1 Gene in Human Health

The study of our genetic structure enables us to gain important knowledge about bodily functions and responses to different elements when we focus on health. The GSTP1 gene plays an essential role in detoxification processes within the body. The gene functions as the blueprint for producing glutathione S-transferase pi 1 (GSTP1), a vital enzyme that removes toxic substances from our bodies. In this section we will investigate the GSTP1 gene significance and how its genetic variations affect human health.

GSTP1: Phase II Detoxification Enzyme

GSTP1 helps remove xenobiotics from the body. The enzyme uses glutathione, the "master antioxidant", to detoxify harmful substances by transforming them into water-soluble forms. GSTP1 enables the removal of harmful substances while enhancing the body’s detoxification mechanisms through excretion. GSTP1 detoxification ability varies depending on genetic mutations in the GSTP1 gene. GSTP1 shows highest expression levels in the liver but exists in additional essential organs including the lungs, kidneys, and intestines. GSTP1 performs an essential function in lung cells by breaking down cancer-causing substances which shows its protective role against health risks.

Genetic Variants and Health Implications

The GSTP1 gene has multiple variants with rs1695 being a primary one which is also known as Ile105Val. This genetic variant contains a "G" allele that modifies the GSTP1 structure and results in diminished enzyme activity. The presence of this variant leads to detoxification challenges for people who carry it as they struggle to break down substances like carcinogens and drugs along with oxidative stress by-products. The rs1695-G variant demonstrates a link to multiple health issues including greater drug toxicity risk and mercury sensitivity alongside increased asthma susceptibility when exposed to smoke for people with the "GG" genotype and enhanced breast cancer risk as well as allergic responses towards air pollution. Studies show mixed results about how this genetic variant connects with diseases such as asthma and cancer and mercury poisoning. Research indicates that dietary habits could influence how the rs1695-G variant affects breast cancer risk. Women who eat less cruciferous vegetables appear more vulnerable to the effects of this genetic variant according to research findings. Cruciferous vegetables contain antioxidants and glutathione which may help reduce negative effects of the GSTP1 variant.

The GSTP1 gene contains the significant rs1138272 variant, also called Ala114Val which features the minor "T" allele. Research indicates that this specific variant may increase susceptibility to smoking's impact on Parkinson's disease development along with enhanced mercury toxicity and nerve disorders. Research presents mixed results about how this genetic variant influences detoxification effectiveness and cancer risk.

Practical Suggestions for Optimal Detoxification

1. Maintain a Balanced Diet: Eating nutrient-rich foods such as cruciferous vegetables helps your body maintain its natural detoxification abilities.
2. Stay Hydrated: Drinking enough water helps the body eliminate toxins while maintaining healthy organ function.
3. Limit Exposure to Toxins: Protect your detoxification pathways by reducing contact with environmental pollutants and dangerous chemicals.
4. Consult a Healthcare Provider: Consult a qualified healthcare professional for individualized support and advice when you have questions regarding your detoxification abilities or genetic predispositions.

The study of genes such as GSTP1 and their detoxification functions generates important knowledge for improving health outcomes and well-being. Active measures to enhance our body's natural detox systems result in improved health and vitality for our entire system. Explore Precision Health & Wellness tests from PlexusDx through their website PlexusDx.com and purchase options at both Amazon and Walmart to improve your health. Personalized health insights provide power that helps to make wise choices about personal wellness.

Frequently Asked Questions

What does the GSTP1 gene actually make, and where in the body is it most active?

GSTP1 codes for glutathione S-transferase pi 1, a phase II detoxification enzyme that uses glutathione to convert xenobiotics into water-soluble forms the body can excrete. The post notes GSTP1 is expressed most highly in the liver but is also present in the lungs, kidneys and intestines. In lung cells it helps break down cancer-causing substances, which is why it is described as protective.

Why is the GSTP1 variant rs1695 also written as Ile105Val?

They are two names for the same GSTP1 variant, one using the rs reference number and one describing the amino acid change at position 105. The post explains that the G allele at this position alters the structure of the GSTP1 enzyme and leaves it with diminished activity. That reduced activity is what makes breaking down carcinogens, drugs and oxidative stress by-products harder for carriers.

Which vegetables does the post connect to the breast cancer risk associated with rs1695-G?

Cruciferous vegetables. The post cites research suggesting dietary habits may influence how the rs1695-G variant relates to breast cancer risk, with women who eat fewer cruciferous vegetables appearing more vulnerable to the variant's effects. Cruciferous vegetables contain antioxidants and glutathione, which the post says may help offset the variant's impact. This describes an association, not a proven protective effect.

How does the GSTP1 rs1138272 variant differ from rs1695?

Rs1138272, also called Ala114Val, is a separate GSTP1 variant whose minor allele is T rather than the G allele discussed for rs1695. The post links rs1138272 to greater susceptibility to smoking's role in Parkinson's disease, heightened mercury toxicity and nerve disorders. It also states that research on how this variant influences detoxification effectiveness and cancer risk has produced mixed results.

How settled is the science linking rs1695-G to asthma, cancer and mercury sensitivity?

Not settled. The post itself says studies show mixed results on how this variant connects with asthma, cancer and mercury poisoning, even while listing those associations. A report of a GSTP1 variant describes an association with a detoxification pathway; it is educational wellness information rather than a clinical finding. Anything you want to act on should be reviewed with a qualified healthcare provider.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.