rs1157492 (KCNK2): Cortical Brain Structure Variant
Key takeaways
- The genetic signal for brain cortex structure found in adults holds up in children too, pointing to genes that shape the brain from very early in life
- rs1157492 in the KCNK2 region was found at genome-wide significance in a brain imaging study covering more than 39,000 adults and 9,000 children
- This locus shows signs of evolutionary negative selection, meaning these variants have been filtered out of the population over time
- This variant is linked to increased activity of the KCNK2 gene in nerve tissue and the KCTD3 gene in esophageal tissue
- Cortical loci of this type are connected to pathways associated with neuropsychiatric risk
Key takeaways
- The genetic signal shaping cortical structure in adults holds up in children as well, pointing to genes that influence brain architecture from very early in development
- rs1157492, in the KCNK2 gene region, was found at genome-wide significance in a brain imaging study covering more than 39,000 adults and 9,000 children
- This locus shows signatures of evolutionary negative selection, meaning these variants have been filtered out of the population over time
- This variant is linked to increased activity of the KCNK2 gene in tibial nerve tissue and increased activity of the neighboring KCTD3 gene in esophageal mucosa tissue
- Cortical loci of this type are connected to pathways associated with neuropsychiatric risk
What the research says A genome-wide association study (GWAS, a large-scale scan linking genetic variants across the genome to measurable traits) using genetically-informed brain atlases in 39,898 adults and 9,136 children identified 440 genome-wide significant loci for regional cortical surface area and thickness in the discovery UK Biobank cohort (n=32,488), including rs1157492 (KCNK2 region). A combined meta-analysis across all cohorts yielded 800 significant loci, with 467 surviving correction for multiple comparisons. Generalization to the ABCD childhood cohort showed beta correlations of r=0.46 to r=0.92, and 18 of 24 cortical phenotypes were significantly genetically correlated between adults and children, supporting a shared genetic architecture across developmental stages.
Reported associations
- Cortical morphology (regional surface area and/or thickness): this locus reached genome-wide significance (p<5e-8) in analyses covering 12 regional surface area and 12 cortical thickness phenotypes; the specific cortical region or measure assigned to rs1157492 is not detailed in the available study excerpt
- Cortical morphology in childhood: genetic effects at this locus generalized to 9,136 ABCD study children, with beta correlations of r=0.46-0.92 relative to the adult discovery sample, supporting early neurodevelopmental origins of the cortical genetic architecture
Evidence quality The discovery sample comprised 32,488 UK Biobank adults (genome-wide threshold p<5e-8; stricter multiple-comparison threshold p<2.27e-9 accounting for 22 effective independent traits). Replication was conducted in 7,410 admixed UK Biobank individuals, with discovery-to-replication beta correlations of r=0.66-0.95. Generalization to 9,136 ABCD children showed beta correlations of r=0.46-0.92 and significant genetic correlations across 18 of 24 cortical phenotypes (genetic correlation rg range 0.38-1.21). The meta-analysis identified 800 genome-wide significant loci, 467 surviving multiple comparison correction. No SNP-level effect size or specific cortical phenotype assignment for rs1157492 is reported in the available study text, which limits interpretation of this variant in isolation. No conflicting findings were present in the provided evidence.
Tissue-specific expression effects
- KCNK2: the alternate allele at this locus is associated with increased KCNK2 expression in tibial nerve tissue GTEx Portal
- KCTD3: the alternate allele is also associated with increased expression of KCTD3, a neighboring gene, in esophageal mucosa tissue GTEx Portal
Lifestyle considerations No lifestyle considerations on file for this variant.
Frequently asked questions
What is rs1157492?
rs1157492 is a single nucleotide polymorphism (a single-letter change in the DNA sequence) located in the KCNK2 gene region. It was identified in a large genome-wide study as associated with the structure of the human cerebral cortex, the brain's outer layer.
What does the KCNK2 gene do?
KCNK2 is the gene at the rs1157492 locus. Tissue-specific gene expression data shows that carrying the alternate allele is associated with increased KCNK2 activity in tibial nerve tissue, suggesting involvement in nerve function. The genome-wide study at this locus focused on cortical brain structure and did not characterize the gene's precise molecular role.
Is rs1157492 associated with brain structure?
Yes. A genome-wide study of 39,898 adults and 9,136 children found this locus to be significant for regional cortical surface area and/or thickness, with effects replicated in independent samples and generalized to a childhood cohort.
Does this variant affect brain development in children as well as adults?
Research suggests yes. Genetic effects at this locus generalized to 9,136 children in the ABCD study with beta correlations of r=0.46-0.92, and 18 of 24 cortical phenotypes were significantly genetically correlated between the adult and child cohorts, indicating the genetic architecture of cortical structure is largely in place early in life.
Is rs1157492 connected to neuropsychiatric conditions?
The study found that cortical genetic loci as a group are linked to neuropsychiatric risk pathways and early neurodevelopment. The provided research does not report a direct association between rs1157492 alone and any specific psychiatric diagnosis.