What you carry at this position in your DNA and what research says about it.
Cellular Detoxification: 4/10 evidence, 14 publications.
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Sample genotype (not yours): T/T
Optimal Detoxification and Lower Neurodevelopmental Risk
Two copies of the T allele provide optimal glyoxalase I enzyme activity. This efficient clearance of cellular byproducts is associated with a lower risk of anxiety and autism.
What this genotype means: Optimal glyoxalase I enzyme levels; Efficient clearance of cellular glycation toxins; Lower susceptibility to anxiety and autism.
Sample genotype (not yours): G/G
Reduced Detoxification and Increased Neurodevelopmental Risk
Two copies of the G allele result in significantly reduced glyoxalase I enzyme activity. This slower clearance of metabolic byproducts is linked to higher cellular stress and increased susceptibility to anxiety and autism.
What this genotype means: Reduced glyoxalase I enzyme levels; Slower clearance of cellular glycation toxins; Increased susceptibility to anxiety and autism.
Sample genotype (not yours): T/G
Moderate Detoxification and Typical Health Risk
Carrying one copy of each allele results in intermediate glyoxalase I enzyme activity. This level is generally sufficient to maintain normal cellular detoxification under typical conditions.
What this genotype means: Intermediate glyoxalase I enzyme levels; Balanced clearance of cellular glycation toxins; Typical population risk for associated traits.
Gene function and biological role
Gene Function: The GLO1 gene encodes glyoxalase I, a vital enzyme responsible for detoxifying methylglyoxal, a toxic byproduct of cellular glycolysis [1]. Without adequate glyoxalase I activity, methylglyoxal accumulates and reacts with proteins and DNA to form harmful advanced glycation end-products [1]. These byproducts trigger oxidative stress, cellular dysfunction, and tissue damage throughout the body [2]. Glyoxalase I is highly expressed in many tissues, including the brain, where it plays a protective role against neuroinflammation [3]. Dysregulation of this enzymatic pathway has been implicated in metabolic, cardiovascular, and psychiatric conditions [2] [3].
Variant Impact: The rs4746 variant is a missense mutation in exon 4 of the GLO1 gene that results in a glutamate-to-alanine substitution at position 111 of the protein [1]. This amino acid change alters the charge and structure of the glyoxalase I enzyme, directly affecting its catalytic efficiency [1]. The major T allele encodes the more active glutamate form, whereas the minor G allele encodes the less active alanine form [1]. Consequently, carriers of the G allele exhibit reduced enzymatic activity and higher levels of methylglyoxal-derived cellular stress [4]. This functional difference links the variant to altered susceptibility to neurodevelopmental, psychiatric, and metabolic traits [4] [3].
Key Insight: The GLO1 enzyme acts as a primary shield against sugar-derived cellular toxins, and this specific variant directly dictates how efficiently your body clears those aging-accelerating compounds.
Location: GLO1. Chromosome 6 · 6p21.2 · 38.7 Mb
Estimated prevalence by population
Global 38.9%; European 30.8%; African 45.0%; East Asian 78.0%; South Asian 57.2%; Americas 36.0%; Ashkenazi 45.4%; Finnish 42.7%; Middle Eastern 45.4%; Amish 21.8%.
Estimated TT genotype frequency.
Global 46.0%; European 49.4%; African 44.2%; East Asian 20.7%; South Asian 36.8%; Americas 48.0%; Ashkenazi 44.0%; Finnish 45.3%; Middle Eastern 44.0%; Amish 49.8%.
Estimated TG genotype frequency.
Global 15.1%; European 19.8%; African 10.8%; East Asian 1.4%; South Asian 5.9%; Americas 16.0%; Ashkenazi 10.7%; Finnish 12.0%; Middle Eastern 10.7%; Amish 28.4%.
Estimated GG genotype frequency.
Showing effects for T/T genotype
Nutrition & Metabolism
Blood Chemistry & Metabolites
Glyoxalase I Activity. Evidence: 4/10. Source: PMID 38565889. Higher Activity.
Neurology & Mental Health
Neurodevelopmental Traits
Autism Susceptibility. Evidence: 3/10. Source: PMID 25201284. Lower Risk.
Anxiety & Stress Disorders
Anxiety. Evidence: 3/10. Source: PMID 18639233. Lower Risk.
Endocrine & Reproductive
Pregnancy & Birth Complications
Gestational Diabetes. Evidence: 3/10. Source: PMID 24908234. Typical Risk.
Showing effects for G/G genotype
Glyoxalase I Activity. Evidence: 4/10. Source: PMID 38565889. Lower Activity.
Autism Susceptibility. Evidence: 3/10. Source: PMID 25201284. Increased Risk.
Anxiety. Evidence: 3/10. Source: PMID 18639233. Increased Risk.
Gestational Diabetes. Evidence: 3/10. Source: PMID 24908234. Lower Risk.
Showing effects for T/G genotype
Glyoxalase I Activity. Evidence: 4/10. Source: PMID 38565889. Moderate Activity.
Autism Susceptibility. Evidence: 3/10. Source: PMID 25201284. Typical Risk.
Anxiety. Evidence: 3/10. Source: PMID 18639233. Typical Risk.
What this genotype means for the people who carry it
Sample genotype: TT (Homozygous)
Having the T/T genotype ensures the production of the highly active glutamate-111 isoform of the glyoxalase I enzyme [1]. This optimal enzyme level allows for the efficient detoxification of methylglyoxal, preventing its accumulation in cells [1]. By keeping methylglyoxal levels low, this genotype minimizes the formation of advanced glycation end-products that cause cellular damage [2]. In the brain, this efficient clearance is protective, correlating with a lower risk of autism spectrum disorders and panic-related anxiety [2] [3]. While some studies suggest a slightly higher baseline risk for gestational diabetes compared to G allele carriers, the overall metabolic profile remains highly efficient [4]. Maintaining a healthy diet low in refined sugars can further support this natural detoxification system.
Optimal glyoxalase I enzyme levels; Efficient clearance of cellular glycation toxins; Lower susceptibility to anxiety and autism.
Sample genotype: GG (Homozygous)
The G/G genotype leads to the exclusive production of the alanine-111 isoform of glyoxalase I, which has lower enzymatic activity [1]. This reduced capacity impairs the detoxification of methylglyoxal, leading to its accumulation in tissues [1]. Elevated methylglyoxal levels promote the formation of advanced glycation end-products, which drive oxidative stress and cellular damage [2]. In the brain, this increased cellular stress is associated with a higher vulnerability to autism and panic disorders [2] [3]. However, some metabolic studies suggest that this genotype may offer a lower risk of gestational diabetes under certain conditions [4]. Minimizing dietary sugar and avoiding high-fructose corn syrup are practical strategies to reduce the metabolic load on this slower detoxification pathway.
Reduced glyoxalase I enzyme levels; Slower clearance of cellular glycation toxins; Increased susceptibility to anxiety and autism.
Sample genotype: TG (Heterozygous)
The T/G genotype produces a mixture of both the high-activity glutamate and lower-activity alanine isoforms of glyoxalase I [1]. This hybrid enzyme profile provides moderate detoxification capacity, which is typically sufficient to manage normal levels of methylglyoxal [1]. Under standard physiological conditions, individuals with this genotype do not experience excessive accumulation of advanced glycation end-products [2]. Consequently, the risk for neurodevelopmental conditions like autism and psychiatric traits like anxiety remains close to the population average [2] [3]. Similarly, metabolic risks, including diabetic complications and gestational diabetes, are intermediate [4]. Supporting the body with antioxidant-rich foods and regular exercise helps maintain optimal metabolic balance.
Intermediate glyoxalase I enzyme levels; Balanced clearance of cellular glycation toxins; Typical population risk for associated traits.
Variants with shared genetic architecture
rs2710323 · ITIH1 Gene · Chr 3 · Schizophrenia Risk
rs4916723 · LINC00461 Gene · Chr 5 · ADHD and Autism Risk
rs10501320 · MADD Gene · Chr 11 · Blood Sugar
C332C genotype of glyoxalase 1 and its association with late diabetic complications.
Content updated August 2026.
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