HSA | FSA CARDS ARE NOW ACCEPTED

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 SIRT1 rs3758391 Variant, the MOTS-c Pathway, and Energy & Metabolism: What Your Genotype May Mean

MOTS-c is a small peptide made in the mitochondria that helps cells manage energy, especially during exercise, fasting, or other metabolic stress. It is being studied for its role in glucose use, fat burning, and improving how efficiently mitochondria produce energy, in part by activating AMPK, a key energy-sensing pathway. SIRT1 is another important metabolism-related gene that helps regulate mitochondrial function, fat metabolism, and stress responses, and its pathways overlap with MOTS-c signaling. Together, these systems support metabolic flexibility, which is the body’s ability to switch between energy sources as needed. Genetic differences in SIRT1 may influence how well these energy-balancing pathways work, helping explain why people can vary in metabolism and resilience.

Genetic variation in the SIRT1 gene may influence how efficiently the biological processes connected to MOTS-c and Energy & Metabolism function. The rs3758391 variant is analyzed in the PlexusDx Precision Peptide Genetic Test as part of the Energy & Metabolism pathway. Depending on your genotype, this variant may have a modest to meaningful influence on mitochondrial function, ATP production, and metabolic efficiency. Understanding your result gives you a personalized starting point for targeted lifestyle, dietary, and supplement strategies grounded in your unique biology.

Practical Foundations for Everyone

Regardless of your SIRT1 rs3758391 genotype, the following lifestyle inputs consistently support sustained energy, metabolic resilience, and cellular vitality. Carriers of the effect allele often notice a stronger return on these habits when applied consistently — which makes regularity more valuable than intensity.

  • Consistent nutrition: A whole-food dietary pattern rich in vegetables, quality protein, healthy fats, and fiber provides the micronutrient foundation that supports energy & metabolism-related pathways at a cellular level.
  • Regular movement: Physical activity — particularly a combination of aerobic exercise and resistance training — supports the metabolic signaling and growth factor pathways that interact with energy & metabolism and biological resilience.
  • Quality sleep: Restorative sleep is essential for cellular repair, hormone regulation, and the metabolic processes that underpin energy and metabolic health. Consistent sleep timing amplifies the benefits of other lifestyle habits.
  • Stress management: Chronic stress elevates cortisol and inflammatory markers that can blunt the efficiency of pathways related to energy & metabolism. A daily stress-reduction practice — even five to ten minutes of slow breathing or mindfulness — helps maintain biological balance.

Diet Recommendations for SIRT1 rs3758391 and the MOTS-c Pathway

A targeted nutritional approach for the SIRT1 rs3758391 variant focuses on supplying the micronutrients and macronutrient balance that support mitochondrial function, ATP production, and metabolic efficiency and reduce the metabolic burden on pathways connected to MOTS-c. Priority nutrients vary by pathway but consistently center on anti-inflammatory whole foods, adequate protein for cellular and tissue support, and micronutrient density from colorful produce and quality fats.

The GLP-1 Support is designed to support this pathway. A nutrient-dense plan supporting GLP-1 medications with protein, healthy fats, and fiber to enhance results and minimize side effects....

Build meals around quality protein sources (fish, poultry, legumes, eggs), fiber-rich carbohydrates (vegetables, whole grains, legumes), and healthy fats (olive oil, avocado, nuts, seeds). Minimize ultra-processed foods, excessive added sugars, and alcohol — all of which increase oxidative and inflammatory burden on pathways that interact with energy & metabolism and MOTS-c-related signaling.

Supplement Considerations for SIRT1 rs3758391 Support

Supplements cannot modify your SIRT1 rs3758391 genotype, but targeted supplementation can address nutritional gaps and support the biological pathways connected to MOTS-c and energy and metabolic health. A foundations-first approach — prioritizing the basics before adding specialty products — produces the most consistent outcomes. Always discuss supplementation with your healthcare provider before starting, especially if you take medications or manage ongoing health conditions.

The PlexusDx Energy Support is a personalized daily pack designed to support this pathway. PlexusDx Energy Support is a personalized daily pack featuring Rhodiola, Methyl B-Complex, and Tyrosine to help support steady energy, focus, and mental clarity. Designed to nourish your body’s natural energy pathways, it helps you feel more energized and resilient throughout the...

Key nutrients commonly relevant to the Energy & Metabolism pathway include those that support mitochondrial function, ATP production, and metabolic efficiency. Assess dietary gaps first; targeted supplementation is most valuable when it addresses a specific nutritional shortfall confirmed by food tracking or lab results rather than used as a substitute for consistent lifestyle habits.

Lifestyle Recommendations for Energy & Metabolism and MOTS-c Pathway Support

Consistent lifestyle habits are the most durable and evidence-supported way to reinforce the biological pathways associated with MOTS-c and energy and metabolic health. For carriers of the SIRT1 rs3758391 effect allele, these habits tend to produce a more noticeable return because they directly influence the signaling environments where the variant has its greatest impact.

A practical weekly target is 150 minutes or more of moderate aerobic activity combined with two to three resistance training sessions. Sleep consistency — a fixed wake time, morning outdoor light, and a 60 to 90 minute wind-down before bed — supports cellular recovery and the hormonal balance that underpins energy and metabolic health. Stress management practices such as slow breathing, mindfulness, or low-stimulation outdoor time help maintain the biological stability that MOTS-c-related pathways depend on for efficient function. Avoiding chronic sleep debt, late-day caffeine, and excessive alcohol further removes common suppressors of energy & metabolism-related signaling.

Genetic Interpretations for rs3758391 (SIRT1)

2 Effect Alleles: TT (+/+)

You have the TT genotype for rs3758391 which means you carry two copies of the effect allele. This variation is associated with altered SIRT1 promoter activity and, in several studies, has been linked to a less favorable metabolic profile, including higher risk of type 2 diabetes or cardiometabolic dysfunction in some populations. In the context of the MOTS-c pathway, this is relevant because MOTS-c is studied for its role in activating AMPK, supporting glucose utilization, and helping cells adapt to metabolic stress, while SIRT1 is a key NAD+-dependent regulator of mitochondrial function, energy sensing, oxidative metabolism, and stress-response signaling. Because SIRT1 and AMPK interact within overlapping mitochondrial and metabolic-adaptation networks, a variant that may reduce or alter SIRT1-related signaling could contribute to lower metabolic flexibility, less efficient mitochondrial adaptation, or weaker stress-response coordination under conditions such as inactivity, overnutrition, poor sleep, or insulin resistance. Studies of rs3758391 are not fully uniform across populations, but several recent human studies support using cautious language that the T allele may be associated with higher metabolic risk, while the C allele may be relatively protective in some groups. For individuals with the TT genotype, practical support may include regular aerobic and resistance exercise, a nutrient-dense high-fiber eating pattern, adequate protein intake, good sleep, weight-management support, and emphasis on insulin-sensitivity habits such as limiting ultra-processed foods and prolonged inactivity. Overall, this genotype may indicate that mitochondrial resilience and metabolic flexibility are somewhat more sensitive to lifestyle context within the broader biological environment relevant to MOTS-c.

1 Effect Allele: TC (+/-)

You have the TC genotype for rs3758391, which means you carry one copy of the effect allele and one copy of the non-effect allele. This intermediate genotype may be associated with a moderate change in SIRT1-related metabolic signaling, often representing a middle-ground pattern between the two homozygous genotypes. In connection with the MOTS-c pathway, this suggests that mitochondrial stress-response signaling, glucose handling, and metabolic adaptation are likely to remain broadly functional, but may show some individual variation depending on diet quality, exercise habits, body composition, and overall metabolic health. Because SIRT1 helps regulate transcriptional programs involved in mitochondrial biogenesis, oxidative metabolism, and cellular adaptation to low-energy states, even modest promoter variation may influence how efficiently cells respond to caloric stress, exercise, or changes in nutrient availability. The evidence for rs3758391 is mixed rather than definitive, with some studies linking the T allele to higher metabolic risk and others finding no association in certain populations, so this genotype is best interpreted as a moderate metabolic modifier rather than a strong predictor. For this genotype, the most useful approach is usually to optimize the surrounding mitochondrial environment through consistent exercise, adequate protein and fiber intake, restorative sleep, and a whole-food dietary pattern that supports insulin sensitivity and metabolic flexibility. Overall, this genotype is best viewed as a moderate-response marker within the broader SIRT1–AMPK–mitochondrial network rather than a stand-alone predictor of metabolic outcome.

0 Effect Alleles: CC (-/-)

You have the CC genotype for rs3758391 which means you carry two copies of the non-effect allele. This genotype is generally associated with a more typical or potentially more favorable SIRT1-related signaling pattern, although findings vary somewhat by study population. In the context of the MOTS-c pathway, this suggests that the SIRT1 portion of the mitochondrial and energy-sensing network is more likely to function within the expected range. Since MOTS-c is studied in relation to AMPK activation, glucose uptake, fatty-acid metabolism, and metabolic resilience, this genotype may indicate that SIRT1-linked transcriptional and stress-response support is less likely to be a major limiting factor in the broader pathway. Human studies in some populations have reported a protective association of the C allele against type 2 diabetes and certain complications, while other studies have found no significant association, so the cleanest interpretation is that this genotype is consistent with a more typical metabolic background rather than guaranteed metabolic advantage. The main recommendations for this genotype are therefore foundational: regular exercise, nutrient-dense meals, adequate protein and fiber, good sleep, and consistent habits that support mitochondrial health and cardiometabolic balance. Overall, this genotype is generally consistent with a more typical SIRT1-mediated contribution to the broader metabolic pathways relevant to MOTS-c.

Inconclusive — No Result

Your genetic data for rs3758391, a SIRT1 gene variant, was not successfully called by the laboratory. This means the test did not detect a reliable result for this position, which can occur for technical reasons such as low signal intensity, DNA quality issues, or limitations of the genotyping array. Without a result, we cannot determine whether you carry the typical or effect variant for this gene. If this information is important for your health decisions, you may wish to consider retesting or confirming this variant through a targeted genetic test or sequencing method.

When to Talk to Your Healthcare Provider

If you have concerns related to energy & metabolism, the MOTS-c pathway, or how your SIRT1 rs3758391 results fit into your broader health picture, consult your healthcare provider. They can interpret your genetic results alongside your symptoms, health history, and lab values to guide appropriate testing, dietary adjustments, and supplementation where relevant.

PlexusDx provides genetic insights to help you understand how your genes may influence nutrient needs and biological pathways. This information is provided for educational and wellness purposes only and does not diagnose, treat, or recommend any specific medication, peptide, or therapy, some of which may be prescription-only, investigational, or intended for research use only. Always consult with a qualified healthcare provider before making changes to your supplement regimen, diet, or health plan based on genetic information.

Frequently Asked Questions About SIRT1 rs3758391 and MOTS-c

What does the SIRT1 rs3758391 variant mean for my energy and metabolic health?

The rs3758391 variant in the SIRT1 gene may influence how efficiently biological processes connected to MOTS-c and Energy & Metabolism function in your body. Depending on your genotype, this can have a modest to meaningful effect on mitochondrial function, ATP production, and metabolic efficiency. Understanding your result gives you a personalized starting point for a targeted lifestyle and nutrition strategy grounded in your unique genetic biology.

How does the MOTS-c pathway relate to SIRT1 and energy and metabolic health?

MOTS-c is a peptide being studied for its potential role in supporting sustained energy, metabolic resilience, and cellular vitality. Researchers are interested in how MOTS-c-associated pathways may interact with genes like SIRT1, which contribute to the signaling environments that influence energy & metabolism function. The PlexusDx Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, and 150 genetic insights — including SIRT1 rs3758391 — to provide a comprehensive view of how your genetics may influence these interconnected systems.

Can lifestyle changes support SIRT1 function regardless of my genotype?

Yes. Consistent lifestyle habits — regular exercise, quality sleep, anti-inflammatory nutrition, and stress management — support energy & metabolism-related biological pathways across all genotypes. For carriers of the effect allele at rs3758391, these habits tend to produce a stronger measurable return because they directly reinforce the signaling environments where this variant has its greatest influence. Consistency and habit stacking — combining exercise, sleep, and nutrition improvements together — tends to produce better outcomes than any single change in isolation.

What tests can help me learn more about my energy and metabolic health and the MOTS-c pathway?

The PlexusDx Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, and 150 genetic insights — including SIRT1 rs3758391 — to deliver a comprehensive picture of how your genetics may influence peptide-related health pathways. The Peptide Pathways Report translates your results into personalized, actionable guidance. Your healthcare provider can also recommend targeted blood tests based on your specific pathway results and health history to complement your genetic insights with current biomarker data.

If this genetic variant is present in your PlexusDx results, the following tests and reports are commonly used to explore it further:

🧬 Genetic Tests:

📄 Genetic Report:

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.