This research describes a large-scale functional study designed to pinpoint the causal genetic variants behind complex human diseases and traits. By utilizing massively parallel reporter assays (MPRA), the authors tested over 200,000 fine-mapped variants across five different cell types to measure their direct impact on gene regulation. They successfully identified 13,121 trait-associated regulatory variants (TARVs), demonstrating that combining experimental data with genomic annotations significantly improves the accuracy of identifying disease-linked alleles. The study further employed saturation mutagenesis to reveal the specific biochemical mechanisms and transcription factor interactions that drive these regulatory effects. Ultimately, this work provides a comprehensive sequence-to-function map that clarifies how subtle genetic differences influence human biology and disease risk.

References:

• Siraj L, Castro R I, Dewey H B, et al. Functional dissection of complex trait variants at single-nucleotide resolution[J]. Nature, 2026: 1-11.