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Genetics

Many Needles in a Haystack: Active Hit Discovery for Perturbation Experiments

Andrea Rubbi, Arpit Merchant, Samuel Ogden, Amir Akbarnejad, Pietro Liò, Sattar Vakili, Mo Lotfollahi

Featured May 24, 2026

Original Paper

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Simply

Finding many effective gene perturbations is like finding many needles in a haystack; this paper's Probability-of-Hit method efficiently finds them by prioritizing genes most likely to cause a desired strong effect.

In depth
The paper introduces Probability-of-Hit (PoH), a novel acquisition function for active learning in high-throughput gene perturbation experiments. Unlike methods that seek a single optimum or merely reduce uncertainty, PoH directly maximizes the discovery of multiple "hits" by selecting candidates with the highest posterior probability of exceeding a predefined phenotypic threshold, balancing exploitation and exploration for efficient resource use in multimodal biological landscapes.

Key Takeaways

  • 1
    The paper introduces Probability-of-Hit (PoH), a novel acquisition function specifically designed for hit discovery in high-throughput perturbation experiments.
  • 2
    PoH directly targets the objective of maximizing the number of perturbations exceeding a phenotypic threshold, outperforming traditional optimization and pure exploration strategies.
  • 3
    The method provides asymptotic optimality guarantees and demonstrates superior empirical performance on both synthetic and real biological datasets, including up to 6.4% improvement on the Schmidt IL-2 dataset.

Conceptual Flow

HIGH LEVEL
1
Methodology: How Probability-of-Hit Works

Instead of just guessing or finding the very best, this method picks genes that are most likely to be good, even if they're not the absolute best, to find many good ones quickly.

All Untested Genes
Predict Chance of Being Good
Pick Most Likely Good Genes
2
Results: Finding More Good Genes

The new method consistently found more good genes than older methods, especially in complex biological situations, making experiments more efficient.

Old Way: Fewer Good Genes
Compared To
New Way: More Good Genes