Expressive

rs12055409 (MLN/LINC01016): Strength and Pain Genetics

Key takeaways

  • This variant near MLN and LINC01016 has been studied in relation to grip strength, height, BMI, and shared genetic risk for chronic pain in studies of up to 436,000 people.
  • The alternate allele reduces expression of nearby genes in thyroid, testis, and tibial nerve, and increases expression of IP6K3 in the thyroid.
  • Genetic risk for chronic pain is partly shared across 24 distinct conditions, pointing to common neurobiological pathways rather than body-site-specific causes.
  • Each GWAS locus explains only a small fraction of total trait heritability - the effect of this variant is modest within a polygenic landscape.

Key takeaways

  • This variant near the MLN and LINC01016 (long intergenic non-coding RNA) locus has been studied in relation to grip strength, height, body mass index, and shared genetic risk for chronic pain.
  • The alternate allele is associated with reduced expression of nearby genes in thyroid, testis, tibial nerve, and pituitary, and with increased expression of IP6K3 in the thyroid.
  • Genetic risk for chronic pain is partly shared across 24 distinct conditions, pointing to common neurobiological pathways rather than body-site-specific mechanisms.
  • Each individual GWAS locus explains only a small fraction of total trait heritability; this variant sits within a highly polygenic architecture.
  • Grip strength shares genetic pathways with cardiometabolic and cognitive traits, placing this locus within a broad network of biological associations.

What the research says A genome-wide association study (GWAS, a method scanning millions of DNA variants for statistical links to a trait) of 223,315 UK Biobank participants identified 101 independent loci for grip strength, 64 of which replicated in a holdout sample of 111,610 individuals; eQTL analyses (tests linking variants to gene activity) highlighted brain-expressed transcripts, and Mendelian randomization (a causal inference method using genetic variants as instruments) found higher grip strength associated with lower odds of coronary heart disease (OR 0.69, 95% CI 0.60 to 0.79) and atrial fibrillation (OR 0.75, 95% CI 0.62 to 0.90) PMID 31024087. A Genomic SEM (Structural Equation Modeling applied to genome-wide summary statistics) of 24 chronic pain conditions in up to 436,000 UK Biobank participants found a general factor explaining most shared genetic variance and a second factor specific to musculoskeletal pain, with pathways overrepresented in brain tissue and genetic overlap with cognition and mood PMID 37220067. A sibling-pair linkage analysis of 119,000 pairs found GWAS loci for height and BMI colocalize with classical linkage signals, estimating heritability of height at 0.76 +/- 0.05 and BMI at 0.55 +/- 0.07, while noting substantial heritability remains unexplained by identified variants PMID 38168931.

Reported associations

  • Grip strength: One of 101 genome-wide significant loci in a 223,315-person UK Biobank GWAS; 64 loci replicated in an independent sample of 111,610; most replicating variants were intronic or intergenic, consistent with regulatory function PMID 31024087
  • Height: Colocalization of GWAS loci with sibling-pair linkage signals confirmed in 119,000 pairs; overall heritability of height estimated at 0.76 +/- 0.05 PMID 38168931
  • Body mass index (BMI): Cataloged in the same sibling-pair analysis; BMI heritability estimated at 0.55 +/- 0.07; polygenic scores for BMI attenuate the linkage signal, consistent with polygenicity PMID 38168931
  • General chronic pain factor: Associated with a cross-condition genetic factor spanning all 24 pain conditions in a Genomic SEM of up to 436,000 participants; the factor overlaps genetically with cognition, mood, and brain structure PMID 37220067
  • Musculoskeletal pain factor: A second, more specific factor for musculoskeletal pain was identified in the same analysis; back pain, neck pain, and arthropathic pain were identified as hub conditions in the cross-condition network PMID 37220067

Evidence quality All three source studies are well-powered by genome-wide standards. The grip strength GWAS used a two-stage design (discovery n=223,315, replication n=111,610) drawn from the UK Biobank PMID 31024087. The chronic pain Genomic SEM included up to 436,000 participants across 24 separately phenotyped conditions PMID 37220067. The sibling-pair analysis used 119,000 pairs, providing a family-based complement to conventional GWAS PMID 38168931. A key limitation is that no single locus explains more than a modest fraction of trait variance; the 2024 sibling-pair study explicitly found that substantial heritability remains unaccounted for even in these large samples, and residual variation is polygenic and enriched near known loci PMID 38168931. Mendelian randomization estimates linking grip strength to cardiovascular outcomes reflect total grip strength genetics and cannot be attributed to this single variant alone PMID 31024087. No direct conflicts between studies were identified for this locus.

Tissue-specific expression effects

  • ENSG00000287089: The alternate allele is associated with reduced expression of this gene in testis, pituitary gland, sun-unexposed suprapubic skin, esophageal gastroesophageal junction, thyroid, and tibial nerve GTEx Portal
  • ENSG00000304146: The alternate allele is associated with reduced expression of this gene in spleen GTEx Portal
  • IP6K3 (inositol hexakisphosphate kinase 3, an enzyme involved in phosphoinositide cell signaling): The alternate allele is associated with increased expression of this gene in thyroid GTEx Portal

Lifestyle considerations No lifestyle considerations on file for this variant.

Frequently asked questions

What genes are near rs12055409?

rs12055409 is located near MLN and LINC01016, a long intergenic non-coding RNA. GTEx expression data also show nearby effects on IP6K3, an enzyme involved in cell signaling, in thyroid tissue.

Is rs12055409 linked to chronic pain?

This variant has been studied in the context of a general genetic factor shared across 24 chronic pain conditions, identified in a Genomic SEM analysis of up to 436,000 UK Biobank participants. The shared factor involves brain-expressed genes and overlaps genetically with cognition and mood traits.

How does rs12055409 affect gene expression?

GTEx v11 data show the alternate allele is associated with reduced expression of ENSG00000287089 in testis, pituitary, skin, esophagus, thyroid, and tibial nerve, and reduced expression of ENSG00000304146 in spleen. It is also associated with increased IP6K3 expression in thyroid. These are regulatory effects, not direct disease outcomes.

Is rs12055409 linked to grip strength or muscle function?

It was identified among 101 genome-wide significant loci for grip strength in a UK Biobank GWAS of 223,315 participants, with 64 of those loci replicating in an independent sample. Most replicating loci were intronic or intergenic, suggesting regulatory rather than protein-coding effects.

How strong is the evidence for rs12055409?

Associations come from well-powered genome-wide studies using 100,000 to 436,000 participants. However, any single GWAS locus explains only a small fraction of total trait variance, and substantial heritability for these complex traits remains unexplained even in large samples.