rs11257240 (ECHDC3): Memory Decline and Dementia Locus

Key takeaways

• rs11257240 near ECHDC3 and USP6NL-AS1 has been studied in large genetic analyses of late-life memory decline and neurodegeneration
• The alternate allele reduces expression of USP6NL-AS1 (a long non-coding RNA) in blood, spleen, and immune cells, with the strongest effect seen in spleen
• Memory performance and decline share genetic architecture with Alzheimer's disease, neuropsychiatric, and autoimmune conditions
• Lewy body dementia shares strong genetic overlap with both Alzheimer's disease (rg = 0.66) and Parkinson's disease (rg = 0.64)
• The functional connection between this locus's peripheral expression effects and brain disease has not yet been established

What the research says A cross-ancestry genome-wide association study (GWAS - a scan of hundreds of thousands of genetic positions for trait associations) of late-life memory performance (n = 27,633) and memory decline (n = 22,365; 129,201 longitudinal observations) across four aging cohorts found both traits to be highly heritable and genetically linked to Alzheimer's disease, neuropsychiatric, and autoimmune conditions PMID 38149979. A separate multi-trait analysis combined the largest available Lewy body dementia GWAS (2,591 cases, 4,027 controls) with Alzheimer's and Parkinson's disease summary statistics, finding strong genome-wide genetic correlations between these diseases and discovering 8 novel LBD-associated loci PMID 35501865. Tissue-level expression data from GTEx v11 (953 donors) show that the alternate allele at this position reduces expression of USP6NL-AS1 most strongly in spleen, with additional reductions in immune cells and blood GTEx Portal.

Reported associations

• Late-life memory performance: Assessed in a cross-ancestry GWAS spanning non-Hispanic White (n = 24,216) and non-Hispanic Black (n = 3,417) participants from the ACT, ADNI, NACC, and ROS/MAP/MARS cohorts; heritability was found to be high and similar across ancestries PMID 38149979
• Late-life memory decline: Evaluated longitudinally across 22,365 participants with 129,201 observations; the analysis identified novel genes including SLC25A44, BSX, and DPP8 for memory decline, alongside established Alzheimer's-linked loci PMID 38149979
• Lewy body dementia and shared neurodegenerative risk: Investigated through multi-trait GWAS analysis (MTAG) pooling LBD, Alzheimer's, and Parkinson's disease data; the study identified 13 significant LBD-associated loci (8 novel), with genes including APOC1, SNCA, TMEM175, CLU, MAPT, and FBXL19 validated by gene-level analysis PMID 35501865

Evidence quality The memory GWAS is among the largest longitudinal analyses of late-life cognitive performance to date, drawing on over 129,000 observations from two distinct ancestry groups PMID 38149979. The LBD multi-trait analysis addressed inherently limited LBD sample sizes by borrowing statistical power from larger Alzheimer's and Parkinson's disease datasets, reaching genome-wide significance at 13 loci PMID 35501865. The GTEx eQTL (expression quantitative trait locus) evidence meets stringent FDR < 0.05 thresholds across all four reported tissues, with p-values ranging from 2.2 × 10^-¹^4 in spleen to 1.3 × 10^-6 in colon transverse GTEx Portal. No conflicting findings are reported in the available literature; however, variant-level effect sizes specific to rs11257240 are not detailed in the available study summaries, and the biological mechanism linking the lncRNA expression changes at this locus to cognitive phenotypes has not yet been characterized.

Tissue-specific expression effects

• USP6NL-AS1: The alternate allele is associated with reduced expression in spleen (largest effect among reported tissues, p = 2.2 × 10^-¹^4), EBV-transformed lymphocytes (immune cell line, p = 2.2 × 10^-8), whole blood (p = 2.2 × 10^-9), and colon transverse (smallest effect among reported tissues, p = 1.3 × 10^-6); the eQTL effect is confined to peripheral tissues with no reported brain-tissue signal in this dataset GTEx Portal

Lifestyle considerations No lifestyle considerations on file for this variant.