Polygenic basis and biomedical consequences of telomere length variation

Telomeres, the end fragments of chromosomes, play key roles in cellular proliferation and senescence. Here we characterize the genetic architecture of naturally occurring variation in leukocyte telomere length (LTL) and identify causal links between LTL and biomedical phenotypes in 472,174 well-characterized UK Biobank participants. We identified 197 independent sentinel variants associated with LTL at 138 genomic loci (108 new). Genetically determined differences in LTL were associated with multiple biological traits, ranging from height to bone marrow function, as well as several diseases spanning neoplastic, vascular and inflammatory pathologies. Finally, we estimated that, at the age of 40 years, people with an LTL >1 s.d. shorter than the population mean had a 2.5-year-lower life expectancy compared with the group with >= 1 s.d. longer LDL. Overall, we furnish new insights into the genetic regulation of LTL, reveal wide-ranging influences of LTL on physiological traits, diseases and longevity, and provide a powerful resource available to the global research community. Genome-wide association and Mendelian randomization analyses in the UK Biobank identify genetic variants associated with leukocyte telomere length and highlight putative causal links between telomere length and biomedical phenotypes.

Automated summary

This study characterized the genetic architecture of leukocyte telomere length in UK Biobank participants and identified 197 sentinel variants associated with LTL at 138 genomic loci. Genetically determined differences in LTL were found to be associated with various biological traits and diseases, and individuals with shorter LTL had a lower life expectancy compared to those with longer LTL. The findings provide insights into the genetic regulation of LTL, as well as its impact on physiological traits, diseases, and longevity.