rs111521129 (RSPO3): Physical Aging and Bone Density

Key takeaways

• This variant near RSPO3 was identified in a genome-wide scan of how physical and cognitive function change over time in the UK Biobank.
• The rate of physical decline has far lower heritability (~3%) than baseline physical function (~31%), making this a harder-to-detect genetic signal.
• Bone mineral density causally influences the rate of physical decline in aging (Mendelian Randomization, effect size gamma = -0.05).
• Cognitive and physical aging have largely separate genetic architectures -- what drives cognitive decline differs from what drives physical decline.
• Evidence for this specific variant is preliminary, with no independent replication documented in the available study data.

What the research says A genome-wide association study of longitudinally curated aging phenotypes in the UK Biobank examined genetic determinants of both baseline function and the rate of decline in physical and cognitive traits. The study found marked differences between the genetics of baseline physical function (heritability ~31%) and accelerated physical decline (heritability ~3%), with distinct associated loci for each outcome. Through Mendelian Randomization, physical decline was linked to bone mineral density (BMD; standardized effect gamma = -0.05) and telomere length (gamma = -0.05), while cognitive decline was largely driven by Alzheimer's disease liability (gamma = 0.17).

Reported associations

• Physical function decline: This locus emerged from a genome-wide scan of longitudinal physical function in the UK Biobank, where the rate of physical decline showed a heritability of approximately 3.15% and implicated distinct genetic loci from those associated with baseline function.
• Bone mineral density: Mendelian Randomization analyses found BMD to causally influence the rate of physical decline in aging (standardized effect gamma = -0.05).
• Cognitive and physical aging: The study found that genetic architectures of cognitive and physical aging overlap very little, with different associated loci for each dimension, and distinct causal drivers (Alzheimer's disease liability for cognitive decline; BMD and telomere length for physical decline).

Evidence quality The study used UK Biobank longitudinal data, a large-scale prospective resource. However, the heritability of physical decline was low (~3.15%), which substantially limits statistical power to detect individual loci. The authors note that selective attrition - whereby healthier participants are more likely to return for follow-up assessments - is a potential source of bias in longitudinal analyses. Three-wave data was available for only a small fraction of participants, restricting most analyses to two-wave models of change. No independent replication of this locus is documented in the available study material. Evidence should be considered preliminary.

Lifestyle considerations No lifestyle considerations on file for this variant.