No Foundations without Foundations -- Why semi-mechanistic models are essential for regulatory biology
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Abstract (arXiv)
Despite substantial efforts, deep learning has not yet delivered a transformative impact on elucidating regulatory biology, particularly in the realm of predicting gene expression profiles. Here, we argue that genuine "foundation models" of regulatory biology will remain out of reach unless guided by frameworks that integrate mechanistic insight with principled experimental design. We present one such ground-up, semi-mechanistic framework that unifies perturbation-based experimental designs across both in vitro and in vivo CRISPR screens, accounting for differentiating and non-differentiating cellular systems. By revealing previously unrecognised assumptions in published machine learning methods, our approach clarifies links with popular techniques such as variational autoencoders and structural causal models. In practice, this framework suggests a modified loss function that we demonstrate can improve predictive performance, and further suggests an error analysis that informs batching strategies. Ultimately, since cellular regulation emerges from innumerable interactions amongst largely uncharted molecular components, we contend that systems-level understanding cannot be achieved through structural biology alone. Instead, we argue that real progress will require a first-principles perspective on how experiments capture biological phenomena, how data are generated, and how these processes can be reflected in more faithful modelling architectures.
Key facts. Cited by 3 papers in the map (data through 13 Oct 2026). Builds on 17 of its 75 references that are in the map. First posted on arXiv 31 Jan 2025.
Builds on
17 of 75 references.
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5 more
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Citing papers per year: 2025: 1; 2026: 2.
3 papers.
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- 2026An Investigation of the NeurIPS and ICML 2025 Position Tracks6 Jul 2026
- 2026Chem-PerturBridge: a harmonized compendium of small molecule perturbation transcriptomic effects29 May 2026
- 2025When three experiments are better than two: Avoiding intractable correlated aleatoric uncertainty by leveraging a novel bias--variance tradeoff4 Sep 2025