rs11172113 — LRP1

The Migraine-Metabolism Gateway: How LRP1 Connects Your Brain to Your Waistline

LRP1 (Low-Density Lipoprotein Receptor-Related Protein 1) is a giant scavenger receptor expressed throughout the body but especially important in the brain and blood vessels. While it was originally studied for its role in clearing lipoproteins from the bloodstream, research over the past decade has revealed that LRP1 serves as a critical hub connecting leptin signaling¹¹ leptin signaling
Leptin is the "satiety hormone" produced by fat cells that tells the brain to stop eating, glutamate neurotransmission, and vascular integrity. The variant rs11172113 sits in an intronic enhancer region that controls how much LRP1 protein your cells produce.

The Mechanism

The rs11172113 variant lies within intron 1 of LRP1 at an enhancer element that regulates gene expression. The C allele creates a binding site for the transcriptional repressor SNAIL²² transcriptional repressor SNAIL
SNAIL (encoded by SNAI1) is a zinc-finger transcription factor that silences gene expression by binding to E-box-like sequences, which reduces LRP1 expression. The T allele does not bind SNAIL and allows higher LRP1 expression. This allele-specific repression has been confirmed experimentally: SNAIL knockdown in C/C cells significantly increases LRP1 levels, while having no effect in T/T cells.

In the brain, LRP1 directly binds both leptin and the leptin receptor complex³³ leptin and the leptin receptor complex
Liu et al. showed LRP1 is required for leptin receptor phosphorylation and downstream STAT3 activation in hypothalamic neurons. When neuronal LRP1 is deleted in mice, the result is obesity driven by increased food intake and decreased energy expenditure — essentially a state of leptin resistance. Even targeted deletion of LRP1 specifically in the hypothalamus is sufficient to trigger accelerated weight gain. This means reduced LRP1 expression (as occurs with the C allele) could weaken the brain's ability to respond to leptin's satiety signals.

LRP1 also modulates NMDA receptor trafficking⁴⁴ NMDA receptor trafficking
LRP1 controls the surface distribution and internalization of the NR2B subunit of NMDA receptors, which are glutamate-gated ion channels involved in pain and migraine pathophysiology at neuronal synapses. Altered NMDA receptor dynamics may contribute to the cortical hyperexcitability that underlies migraine with aura.

The Evidence

The original GWAS discovery⁵⁵ original GWAS discovery
Chasman et al. Genome-wide Association Study Reveals Three Susceptibility Loci for Common Migraine in the General Population. Nat Genet, 2011 identified rs11172113 in a study of 5,122 migraineurs and 18,108 controls, with the T allele conferring protection (OR 0.90, 95% CI 0.87-0.93, p = 4.3 x 10^-9). This has been replicated in European populations⁶⁶ replicated in European populations
Esserlind et al. Replication and meta-analysis of common variants identifies a genome-wide significant locus in migraine. Eur J Neurol, 2013 and confirmed as the likely causal variant with posterior probability of 1.0 in fine-mapping studies.

A landmark mouse study⁷⁷ mouse study
Liu et al. Lipoprotein receptor LRP1 regulates leptin signaling and energy homeostasis in the adult central nervous system. PLoS Biol, 2011 demonstrated that brain-specific LRP1 knockout mice develop obesity with impaired hypothalamic STAT3 phosphorylation — the key downstream step in leptin signaling. LRP1 overexpression rescued the phenotype, confirming a causal role.

The most mechanistically detailed work came from Liu et al. 2024⁸⁸ Liu et al. 2024
LRP1 Repression by SNAIL Results in ECM Remodeling in Genetic Risk for Vascular Diseases. Circ Res, 2024, which used iPSC-derived smooth muscle cells to show that rs11172113 lies in an enhancer region and that the C allele permits SNAIL-mediated repression of LRP1. This variant was identified as the causal SNP for multiple traits: migraine, fibromuscular dysplasia (OR 1.34, p = 2 x 10^-10), pulse pressure, and spontaneous coronary artery dissection.

The effect size for migraine is modest (OR ~1.11 per C allele), consistent with a common regulatory variant contributing to a complex trait. However, the convergence of GWAS evidence across multiple vascular and neurological phenotypes, combined with robust functional characterization, places this variant on solid mechanistic ground.

Practical Actions

Carriers of the C allele have reduced LRP1 expression, which may impair central leptin signaling and increase migraine susceptibility. Magnesium supplementation is well-established for migraine prevention and also modulates NMDA receptor activity — the same pathway influenced by LRP1. Riboflavin (vitamin B2) at 400 mg/day has strong evidence for migraine prophylaxis and supports mitochondrial function in neurons. Omega-3 fatty acids reduce neuroinflammation and support vascular health, both relevant to the LRP1 pathway.

Monitoring leptin and metabolic markers is relevant because reduced LRP1 function in the brain may contribute to leptin resistance even in the absence of frank obesity.

Interactions

LRP1's role in leptin signaling creates a potential interaction with variants in the leptin pathway. Carriers of rs11172113 CC who also carry the LEPR rs1137101 GG (reduced leptin receptor sensitivity) may experience compounded leptin resistance — both the receptor itself and the LRP1 co-receptor that facilitates its signaling are impaired. Similarly, LEP rs7799039 AA carriers (elevated leptin production) with reduced LRP1 expression may develop more pronounced leptin resistance, as the brain's capacity to transduce the leptin signal is diminished despite high circulating levels.

The FTO rs9939609 AA genotype (increased appetite drive) may compound with reduced LRP1 signaling to further weaken central satiety regulation, though this interaction has not been directly studied in humans.