# Impact of genetic variants linked to liver fat and liver volume on MRI-mapped body composition

## TL;DR

This study explores how genetic variants affecting liver fat and volume are linked to body composition and biomarkers using MRI data and genetic analysis.

## Contribution

The study identifies a novel liver volume locus (ADH4) and reveals sex-specific and tissue-level effects of liver-related genetic variants.

## Key findings

- Liver fat-increasing variants are associated with higher liver fat fraction and adverse metabolic biomarkers.
- Liver volume variants show heterogeneous and sex-specific effects on tissue volumes and biomarkers.
- The ADH4 locus is suggested as a new genetic contributor to liver volume.

## Abstract

A quarter of the world population is estimated to have metabolic dysfunction-associated steatotic liver disease. Here, we aim to understand the impact of liver trait-associated genetic variants on fat content and tissue volume across organs and body compartments and on a large set of biomarkers.

Genome-wide association analyses were performed on liver fat and liver volume estimated with magnetic resonance imaging in up to 27,243 unrelated European participants from the UK Biobank. Identified variants were assessed for associations with fat fraction and tissue volume in >2 million ‘Imiomics’ image elements in 22,261 individuals and with circulating biomarkers in 310,224 individuals.

We confirmed four liver fat and nine liver volume previously reported genetic variants (p values <5 × 10-8). We further found evidence suggestive of a novel liver volume locus, ADH4, where each additional T allele increased liver volume by 0.05 SD (SE = 0.01, p value = 3.3 × 10-8). The Imiomics analyses showed that liver fat-increasing variants were specifically associated with fat fraction of the liver tissue (p values <2.8 × 10-3) and with higher inflammation, liver and renal injury biomarkers, and lower lipid levels. Associations of liver volume variants with fat content, tissue volume, and biomarkers were more heterogeneous, for example the liver volume-increasing alleles at CENPW and PPP1R3B were associated with higher skeletal muscle volumes and were more pronounced in men, whereas the GCKR variant was negatively associated with lower skeletal muscle volumes in women (p values <2.8 × 10-3).

Liver fat-increasing variants were mostly linked to fat fraction of the liver and were positively associated with some adverse metabolic biomarkers and negatively with lipids. In contrast, liver volume-associated variants showed a less consistent pattern across organs and biomarkers.

Liver fat and liver volume are common metabolic traits with a strong genetic component, yet the extent to which they exert organ-specific vs. systemic effects remains poorly defined. By integrating genome-wide association analyses and high-resolution neck-to-knee magnetic resonance imaging data through the Imiomics framework, this study reveals distinct genetic architectures for liver fat and liver volume, including sex-specific effects. These findings provide new insights into the biological, organ-level, tissue-specific, and systemic characteristics of steatotic liver disease and its genetic determinants. The results may inform the development of precision imaging genetic approaches, biomarker discovery, and stratified risk assessment strategies, while reinforcing the importance of incorporating sex-specific analyses in future research and clinical applications.

Image 1

•MRI-based GWAS identified four liver fat and 10 liver volume-associated variants.•Liver fat variants had localized effects on the liver, with limited effects in other organs, as shown by Imiomics voxel-wise mapping.•Imiomics analysis revealed heterogeneous and sex-specific effects of liver volume variants across organs and tissues.•We found evidence suggestive of a novel liver volume locus, ADH4.•Liver fat variants were linked to increased markers of inflammation, liver injury, and lower lipid levels.

MRI-based GWAS identified four liver fat and 10 liver volume-associated variants.

Liver fat variants had localized effects on the liver, with limited effects in other organs, as shown by Imiomics voxel-wise mapping.

Imiomics analysis revealed heterogeneous and sex-specific effects of liver volume variants across organs and tissues.

We found evidence suggestive of a novel liver volume locus, ADH4.

Liver fat variants were linked to increased markers of inflammation, liver injury, and lower lipid levels.