NEGR1 rs66495454: Neurodevelopment and Metabolic Traits
rs66495454 is a single nucleotide polymorphism located in the NEGR1 gene on chromosome 1. Large-scale genome-wide association studies have linked this genomic region to neurodevelopmental metrics, body mass index, and metabolic susceptibility traits. However, its overall individual effect size is modest, and the current clinical evidence for predicting personal health outcomes remains limited.
What each genotype means
Typical metabolic risk profile
This genotype represents the common variant state often observed in population studies. Research links NEGR1 variants to variations in body mass index and neurodevelopmental metrics, though the individual impact of this specific genotype remains limited and context-dependent. These associations are based on statistical population trends and do not predict personal health outcomes.
This is a common genotype found in a significant portion of the population across European and East Asian ancestries.
Typical metabolic risk profile
This heterozygous genotype is frequently observed in large-scale genomic studies of body mass index and neurodevelopmental traits. While NEGR1 is a recognized gene of interest in metabolic and neuropsychiatric research, the clinical significance of carrying one copy of this variant is not well-defined. These findings reflect broad population associations rather than individual diagnostic indicators.
This genotype is carried by a substantial percentage of individuals, consistent with the reported minor allele frequency of 0.20-0.30 in major ancestral groups.
Typical metabolic risk profile
This genotype is identified in studies exploring the genetic architecture of body mass index and neurodevelopmental susceptibility. Current evidence suggests that NEGR1 variants contribute to these traits, but the effect size for any single genotype is generally small. These results are derived from population-level GWAS data and should not be used to infer personal health risks.
This genotype occurs at a frequency consistent with the observed minor allele distribution in European and East Asian populations.
Genomic Location and Variant Characteristics
The variant rs66495454 is an intronic single nucleotide polymorphism mapped within the neuronal growth regulator 1 (NEGR1) gene locus on chromosome 1p31.1. As cataloged in resources like dbSNP and the GWAS Catalog, intronic variants such as rs66495454 do not directly change the amino acid sequence of the encoded protein. Instead, variants in these non-coding regions are often evaluated for their potential regulatory functions, such as influencing gene transcription levels, alternative splicing, or chromatin accessibility. In genetic research, rs66495454 frequently serves as a tag variant or proxy for a broader haplotype block spanning the NEGR1 locus. Genomic data suggest that sequence variation in this region can subtly correlate with surrounding regulatory elements that modulate NEGR1 expression across developing neural circuits and adult brain tissues.
The Biological Role of the NEGR1 Gene
The NEGR1 gene encodes neuronal growth regulator 1, a member of the IgLON subgroup of the immunoglobulin superfamily of cell adhesion molecules. NEGR1 is anchored to the cell membrane by a glycosylphosphatidylinositol (GPI) anchor and plays a critical role in the central nervous system. Biological research shows that NEGR1 participates in neurite outgrowth, neuronal arborization, dendritic spine formation, and the precise assembly of synaptic connectivity. In addition to regulating neurodevelopmental processes, NEGR1 is prominently expressed in hypothalamic circuits that govern central energy homeostasis, appetite signaling, and metabolic rate. Functional knock-out and down-regulation studies in animal models demonstrate that disruption of Negr1 affects both neurobehavioral outcomes—including anxiety-like and social behaviors—and peripheral metabolism, reinforcing its dual biological function at the intersection of brain architecture and metabolic regulation.
Scientific Evidence and Trait Associations
Genome-wide association studies (GWAS) indexed in the NHGRI-EBI GWAS Catalog have identified associations between the NEGR1 genomic locus and traits including body mass index (BMI), dietary measurements, educational attainment, and cognitive performance metrics. For rs66495454 specifically, research shows statistical associations with dietary patterns and educational metrics. While these population-level statistical correlations meet strict genome-wide significance thresholds, the direct physiological impact of a single allele at rs66495454 is tiny, explaining only a small fraction of a percent of phenotypic variance. Furthermore, the evidence strength for direct clinical utility is formally graded as limited. The observed correlations do not imply that this variant causes changes in body weight or cognitive capability on its own, as polygenic architecture and environmental interactions overwhelmingly determine these complex traits.
What Your Genotype Means in Everyday Life
Learning your rs66495454 genotype provides an educational glimpse into polygenic inheritance, but it does not represent a clinical diagnosis or a predetermined health fate. Possessing an allele statistically correlated with higher BMI or specific neurobehavioral metrics does not mean you will develop obesity or experience neurodevelopmental difficulties. Complex physiological traits arise from the intricate interplay of hundreds or thousands of genetic variants acting alongside diet, sleep, stress, socioeconomic factors, and physical activity. Genetic testing services that report on NEGR1 variants should be viewed as informational rather than actionable medical advice. Consumers should never adjust prescribed medications, alter dietary regimens drastically, or interpret genotype findings as diagnostic without comprehensive consultation with a licensed healthcare provider or medical geneticist.
How common is this variant?
The minor allele frequency for rs66495454 is estimated at approximately 0.20 to 0.30 in populations of European and East Asian ancestry, indicating that the variant is commonly distributed throughout these ancestral groups.
Frequently asked questions
Does the NEGR1 rs66495454 variant cause obesity?
No, rs66495454 does not cause obesity. It is a common non-coding variant that shows slight statistical correlations with body mass index and dietary habits in large population studies, but its individual biological effect is very small.
How does NEGR1 affect both the brain and body weight?
The NEGR1 protein functions as a neuronal cell adhesion molecule involved in synapse formation and brain wiring. Because it is active in the hypothalamus—the central brain region governing appetite and metabolic rate—variations in its regulation can influence both neurological processes and energy balance.
Can genetic testing of rs66495454 diagnose neurodevelopmental disorders?
No, commercial testing of rs66495454 cannot diagnose any neurodevelopmental or psychiatric condition. While severe rare deletions in the NEGR1 gene have been investigated in clinical genetics, common single nucleotide polymorphisms like rs66495454 only confer minor statistical shifts across whole populations.
Should I change my diet or lifestyle based on my rs66495454 genotype?
No lifestyle changes should be made solely based on this variant. Standard evidence-based health practices, such as balanced nutrition and regular physical activity, remain far more influential for long-term health than individual common genetic variants.
Sources & further reading
Educational information only, last refreshed 9/5/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs66495454?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29