# Bridging single-molecule and genome-wide studies of cellular mRNA translation

## TL;DR

This paper reviews how combining two techniques, Ribo-seq and single-molecule imaging, can provide a more complete understanding of mRNA translation in cells.

## Contribution

The paper highlights recent innovations that are bridging the gap between genome-wide and single-molecule studies of translation.

## Key findings

- Ribo-seq reveals genome-wide ribosome positions and translation efficiencies.
- Single-molecule imaging captures real-time, heterogeneous translation dynamics on individual mRNAs.
- Recent innovations are enabling the integration of these complementary techniques for a unified view of translation.

## Abstract

The translation of mRNA is a tightly regulated, energy-intensive process that drives cellular diversity. Understanding its control requires tools that can capture behavior across scales. Over the past two decades, two complementary techniques have emerged that have transformed our understanding of mRNA translation within cells: ribosome profiling (Ribo-seq) and live, single-molecule imaging. Ribo-seq provides genome-wide, codon-level maps of ribosome positions, revealing pause sites, novel open reading frames, and global translation efficiencies. In contrast, live, single-molecule imaging visualizes translation on individual mRNAs in living cells, uncovering heterogeneous initiation, elongation, pausing, and spatial organization in real time. Together, these methods offer complementary strengths—molecular breadth versus temporal and spatial precision—but are rarely applied in tandem. Here, we review their principles, key discoveries, and recent innovations that are bringing them closer together, including endogenous tagging, higher-throughput imaging, absolute calibration, and spatially resolved footprinting. Integrating these approaches promises a unified, multiscale view of translation that connects the dynamics of individual ribosomes to genome-wide patterns of protein synthesis.