Expressive

rs12230740 (MIR4303): Cognitive Function Variant

Key takeaways

  • rs12230740 is one of 148 loci significantly associated with general cognitive function in a GWAS of 300,486 individuals.
  • The locus sits near MIR4303, a microRNA gene, and RNU4-41P, a small nuclear RNA pseudogene.
  • Polygenic scores built from all 148 loci predict up to 4.3% of variance in cognitive function.
  • GTEx data show the ALT allele increases PAFAH1B2P2 expression in tibial nerve tissue.
  • Evidence for this specific locus is preliminary and lacks independent replication in the provided sources.

Key takeaways

  • rs12230740 is one of 148 loci significantly associated with general cognitive function in a GWAS of 300,486 individuals.
  • The locus sits near MIR4303, a microRNA gene, and RNU4-41P, a small nuclear RNA pseudogene.
  • Polygenic scores built from all 148 loci predict up to 4.3% of variance in cognitive function.
  • GTEx data show the ALT allele increases PAFAH1B2P2 expression in tibial nerve tissue.
  • Evidence for this specific locus is preliminary and lacks independent replication in the provided sources.

What the research says rs12230740, located in the MIR4303 (a microRNA gene) and RNU4-41P (a small nuclear RNA pseudogene) region, emerged as one of 148 genome-wide significant loci (p < 5e-8) for general cognitive function in a GWAS spanning 300,486 participants aged 16 to 102, combining data from the CHARGE and COGENT consortia and UK Biobank. Across all 148 identified loci combined, polygenic scores predicted up to 4.3% of variance in general cognitive function in independent samples. The same study detected significant genetic overlap between this trait and reaction time, eyesight, hypertension, and longevity.

Reported associations

  • General cognitive function: rs12230740 reached genome-wide significance (p < 5e-8) in a GWAS of 300,486 individuals; the study does not report a locus-specific effect size for this variant.

Evidence quality The association derives from a single well-powered GWAS (N = 300,486, p < 5e-8) combining three major cohorts: CHARGE, COGENT, and UK Biobank. The study-wide significance threshold is stringent and the sample size is large. However, the provided materials include no independent replication specifically for rs12230740, and no per-locus effect size is reported in the available abstract or excerpts. The 4.3% variance prediction applies to all 148 loci combined via polygenic scoring, not to this single variant in isolation. Evidence for this specific locus should therefore be considered preliminary.

Tissue-specific expression effects

  • PAFAH1B2P2: The ALT allele at this locus is associated with increased expression of PAFAH1B2P2 (a pseudogene - an inactive genomic copy - related to platelet-activating factor acetylhydrolase 1b regulatory subunit 2) in tibial nerve tissue (p = 3.2e-27) GTEx Portal. This is an eQTL (expression quantitative trait locus) finding, meaning the variant correlates with transcript levels in that tissue; it does not directly establish a clinical outcome.

Lifestyle considerations No lifestyle considerations on file for this variant.

Frequently asked questions

What is rs12230740 associated with?

rs12230740 has been associated with general cognitive function - the shared component across different types of mental ability - in a large genome-wide association study of 300,486 individuals. It is one of 148 loci that reached genome-wide significance in that study.

What genes are near rs12230740?

rs12230740 is located in the MIR4303 - RNU4-41P region. MIR4303 is a microRNA gene (microRNAs are short RNA molecules that regulate the activity of other genes), and RNU4-41P is a pseudogene, meaning an inactive genomic copy of a small nuclear RNA gene.

How strong is the evidence linking rs12230740 to cognitive function?

The variant reached genome-wide significance (p < 5e-8) in a well-powered study of over 300,000 participants. However, independent replication evidence specifically for this locus is not present in the available sources, so the finding should be considered preliminary.

Does rs12230740 affect gene expression?

According to GTEx data, the ALT allele at rs12230740 is associated with increased expression of PAFAH1B2P2 in tibial nerve tissue. This eQTL finding describes a statistical correlation between the variant and gene expression levels in that tissue, not a direct clinical effect.

How much of cognitive function variance does this variant explain?

The study does not report an individual effect size for rs12230740. Across all 148 identified loci together, polygenic scores predicted up to 4.3% of variance in general cognitive function in independent samples.