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LT-FGRS: a unifying R-package for the estimation of family-based genetic liabilities at population-scale

Pedersen, E. M.; Steinbach, J.; Valstad, M.; Ohlsson, H.; Rasmussen, L. A.; Eilertsen, E. M.; Kendler, K. S.; Vilhjalmsson, B. J.; Schork, A. J.; Krebs, M. D.

2026-06-19 genetics
10.64898/2026.06.15.731517 bioRxiv
Show abstract

Estimates of per-individual genetic liability from large-scale family data are routinely used in biomedical research to describe genetic etiology of traits and disorders, boost the power of gene-mapping studies, and improve risk predictions. Here we present LT-FGRS, an R package for handling population-scale pedigrees and implementing multiple state-of-the-field methods for estimating genetic liability from such data. Benchmarking in population-scale Nordic registry data demonstrates that LT-FGRS reproduces estimates from existing implementations at manageable computational cost. LT-FGRS unifies previous parallel implementations into a single framework, lowering barriers for methodological comparison and applied use. Availability and ImplementationLT-FGRS is available as an R-package on CRAN. (https://CRAN.R-project.org/package=LTFGRS) Contactemp@au.dk; morten.dybdahl.krebs@regionh.dk Supplementary informationhttps://emilmip.github.io/LTFGRS

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