Single-cell RNA sequencing (scRNA-seq) is a family of laboratory methods that measure which genes are being transcribed in individual cells, by capturing and sequencing the messenger RNA of each cell separately. Conventional bulk RNA sequencing needed hundreds of thousands of cells for a reliable measurement and reports their average.[47] scRNA-seq instead produces gene counts for each cell, which lets researchers identify cell types and states, find rare populations, and follow processes such as differentiation.[2][11] Since an early whole-transcriptome study of a single cell in 2009, throughput has grown from a handful of cells per study to single experiments covering millions of cells and public collections of hundreds of millions.[1][26][41] Those collections are the main training data for single-cell foundation models such as Geneformer, scGPT, and TranscriptFormer, and for "virtual cell" models that try to predict how cells respond to drugs or genetic changes.[30][31][35][36]

How it works

A typical experiment has four stages. Cells are first separated from tissue or culture, either by sorting them into the wells of a plate or by isolating each one in a droplet or microwell. Each cell is then lysed and its polyadenylated mRNA is reverse-transcribed into complementary DNA (cDNA). In most current methods the primers used at this step carry a cell barcode, a short DNA sequence shared by every molecule from the same cell, so that material from many cells can be pooled and sequenced together and then sorted back to its cell of origin. Many methods also add a unique molecular identifier (UMI), a random sequence attached to each original mRNA molecule, which lets software count molecules rather than amplified copies and so reduces amplification bias. After amplification and library preparation, the pooled cDNA is read on a short-read sequencer, and the reads are aligned and collapsed into a cell-by-gene count matrix.[4][7][8][12]

The 10x Genomics platform described in 2017 shows the design in practice. Cells flow through a microfluidic chip and are partitioned into droplets with gel beads; each bead carries a 14-base cell barcode drawn from about 750,000 designed sequences, a 10-base UMI, and an oligo-dT primer that binds polyadenylated RNA. The system captured roughly half of the cells loaded and could process up to eight samples in about six minutes.[12]

History

Year	Development
2009	Tang and colleagues sequence the whole transcriptome of a single mouse blastomere, detecting about 75 percent more genes than microarrays. Nature Methods later described this study as starting the shift of single-cell analysis from imaging toward sequencing.[1][2]
2011	STRT adds cell barcodes during reverse transcription, so many cells can be pooled in one sequencing library.[3] Kivioja and colleagues introduce unique molecular identifiers for counting absolute numbers of molecules.[4]
2012	Smart-seq produces full-length transcript coverage from single-cell amounts of RNA,[5] and CEL-Seq uses barcoding with linear amplification.[6]
2013	Smart-seq2 improves sensitivity and full-length coverage.[7] Nature Methods names single-cell sequencing its Method of the Year for 2013.[2]
2014	UMIs are applied to quantitative scRNA-seq.[8] MARS-seq, a massively parallel plate-based method, groups tissue cells into types without relying on predefined markers.[9] Monocle orders cells along a "pseudotime" trajectory of differentiation.[22]
2015	Drop-seq profiles 44,808 mouse retinal cells in nanoliter droplets and finds 39 transcriptionally distinct populations.[10] inDrop, published in the same issue of Cell, uses barcoded hydrogel beads in droplets.[11]
2016	Perturb-seq pairs pooled CRISPR perturbations with scRNA-seq readouts, measuring the transcriptional effect of each perturbation in about 200,000 cells.[17]
2017	The 10x Genomics droplet system is described with data from about 250,000 cells across 29 samples.[12] Seq-Well offers a portable, low-cost microwell format.[13] sci-RNA-seq uses combinatorial indexing to profile a whole multicellular organism, the nematode C. elegans.[14] DroNc-seq brings droplet throughput to single-nucleus RNA-seq.[16]
2018	SPLiT-seq uses split-pool barcoding on the developing mouse brain and spinal cord.[15] The Tabula Muris atlas covers more than 100,000 cells from 20 mouse organs.[28] RNA velocity infers future cell states from spliced and unspliced reads.[23]
2019	Combinatorial indexing profiles about 2 million cells from 61 mouse embryos in a single experiment.[26]
2022	Genome-scale Perturb-seq targets every expressed gene with CRISPR interference across more than 2.5 million human cells.[18] The first Tabula Sapiens release covers nearly 500,000 human cells.[29]
2023-2026	Single-cell foundation models trained on tens to hundreds of millions of cells appear (see Use in AI models). Tahoe-100M, a perturbation atlas of 100 million cells, is released in 2025 and published in Cell in 2026.[19][20]

Major platforms

Methods differ mainly in how they isolate cells and attach barcodes, which sets a trade-off between the number of cells per experiment and the depth of measurement per cell. In building the Tabula Muris atlas, for example, researchers used droplet-based 3' counting to survey thousands of cells at relatively low coverage and plate-based full-length sequencing of sorted cells to characterize cell types with high sensitivity.[28]

Approach	Examples	How it works	Typical trade-off
Plate-based, full-length	Smart-seq, Smart-seq2	Individual cells are sorted into wells and full-length cDNA is generated for each.[5][7]	High sensitivity and coverage of whole transcripts, at lower throughput.[28]
Plate-based, barcoded 3' or 5' ends	STRT, CEL-Seq, MARS-seq	Barcodes added early allow cells from many wells to be pooled.[3][6][9]	More cells per experiment and, with UMIs, molecule counting;[8] only one end of each transcript is sequenced.
Droplet microfluidics	Drop-seq, inDrop, 10x Genomics Chromium	Each cell is co-encapsulated with a barcoded bead in a nanoliter droplet.[10][11][12]	Thousands of cells per run at relatively low coverage per cell.[12][28]
Microwell arrays	Seq-Well	Cells and barcoded beads settle into an array of small wells.[13]	Portable and low cost.[13]
Combinatorial indexing	sci-RNA-seq, SPLiT-seq	Cells or nuclei are repeatedly split into wells, barcoded, and pooled, so each ends up with a unique combination of barcodes without being physically isolated.[14][15]	Scales to millions of cells in one experiment.[26]

Some of the largest datasets come from commercial services. Tahoe-100M was produced by Vevo Therapeutics (later renamed Tahoe Therapeutics) with the Parse Biosciences GigaLab and sequenced on Ultima Genomics' UG 100 instrument.[20][41] The Billion Cells Project uses 10x Genomics' Chromium GEM-X system with Ultima sequencing.[33]

Related methods

Single-nucleus RNA-seq sequences RNA from isolated nuclei instead of whole cells. It can be used on preserved tissue and on tissue that cannot be dissociated into intact cells; DroNc-seq was demonstrated on archived mouse and human brain samples.[16]
Perturb-seq and related CRISPR screens attach a guide-RNA readout to each cell, so the effect of each genetic perturbation can be read from the cell's transcriptome. These datasets are central to training models that predict perturbation responses.[17][18]
Spatial transcriptomics measures gene expression while keeping each cell's position in the tissue. Nature Methods named spatially resolved transcriptomics its Method of the Year 2020.[25]

Data analysis

A cell-by-gene matrix from scRNA-seq usually goes through quality control (removing damaged cells and empty droplets), normalization for differences in sequencing depth, selection of highly variable genes, and dimensionality reduction with principal component analysis. Cells are then grouped by graph-based clustering and visualized in two dimensions with UMAP or t-SNE, and clusters are annotated as cell types using marker genes.[50] Widely used toolkits include Seurat, written in R, and Scanpy, written in Python.[21][34][37]

Several analyses are specific to single-cell data. Integration methods align datasets collected in different experiments, technologies, or species so that shared cell populations can be compared; Seurat's 2018 integration method is one example.[34] Trajectory inference orders cells along a continuous process. Monocle, introduced in 2014, placed differentiating human myoblasts in "pseudotemporal" order.[22] RNA velocity, published in 2018, estimates the direction in which each cell's expression is changing by comparing unspliced and spliced mRNA, predicting future states on a timescale of hours.[23]

Atlases and data repositories

Large reference atlases built from scRNA-seq supply both biological maps and the bulk of AI training data.

Resource	Description
Human Cell Atlas	An international consortium founded in 2016 at the Wellcome Trust in London and co-led by Sarah Teichmann and Aviv Regev, with the goal of mapping the roughly 37 trillion cells of the human body. In November 2024 it released a collection of 43 papers, 13 of them in Nature, as a foundation for its first draft atlas; it then had more than 3,600 members in over 100 countries.[27]
Tabula Muris	A 2018 mouse atlas of more than 100,000 cells from 20 organs and tissues.[28]
Tabula Sapiens	A human reference atlas from the Tabula Sapiens Consortium. The 2022 release covered nearly 500,000 cells from 24 tissues and organs and more than 400 cell types; version 2.0 added nine donors and four tissues, doubling the number of cells and bringing the total to 28 organs and tissues.[29][38]
CZ CELLxGENE Discover and Census	An open platform run by the Chan Zuckerberg Initiative that standardizes submitted datasets to a common metadata schema. In October 2024 it held more than 1,550 datasets and 169.3 million cells (93.6 million unique). Its Census interface listed 1,845 datasets in November 2025, including more than 162 million human cells.[39][40]
Arc Virtual Cell Atlas	Launched by the Arc Institute in February 2025 with more than 300 million cells, combining scBaseCount (over 200 million cells from 21 species, curated from public repositories by AI agents) with Tahoe-100M.[41]
Tahoe-100M	A perturbation atlas of 100 million transcriptomes from 50 cancer cell lines treated under 1,100 drug-dose conditions, released openly for training predictive models.[19][20]
Billion Cells Project	Launched by the Chan Zuckerberg Initiative in February 2025 with 10x Genomics and Ultima Genomics to generate a one-billion-cell dataset for AI model training, with initial data from mouse, zebrafish, and primary human cell models.[33]

Use in AI models

Single-cell foundation models

In the early 2020s researchers began applying the pretraining approach of large language models to scRNA-seq data. The scGPT authors described the analogy directly: as texts are made of words, cells are defined by genes.[31] These models typically treat genes and their expression levels as tokens, pretrain a transformer on millions of unlabeled cells with self-supervised learning, and then reuse the learned representations for downstream tasks through fine-tuning or zero-shot use.[30][31]

Model	Developer	Published	Pretraining data	Notes
Geneformer	Theodoris et al. (Dana-Farber, Broad Institute, and collaborators)	Nature, 2023	About 30 million single-cell transcriptomes	Context-aware, attention-based model for network biology. After fine-tuning it identified candidate therapeutic targets for cardiomyopathy.[30]
scGPT	Cui et al. (University of Toronto, Vector Institute)	Nature Methods, 2024	More than 33 million cells	Generative pretrained transformer adapted to cell type annotation, batch integration, multi-omic integration, perturbation prediction, and gene network inference.[31]
scFoundation	Hao et al. (Tsinghua University, BioMap)	Nature Methods, 2024	More than 50 million human cells	100 million parameters covering about 20,000 genes, with an asymmetric transformer-like architecture.[32]
Universal Cell Embeddings (UCE)	Rosen et al. (Stanford University)	bioRxiv preprint, 2023	36 million cells from eight species	Produces a shared embedding space for cells across species.[42]
TranscriptFormer	Chan Zuckerberg Initiative	bioRxiv preprint, 2025	Up to 112 million cells from 12 species	Generative model that jointly models gene identities and expression levels across about 1.5 billion years of evolution.[35]
State	Arc Institute	Released June 2025	About 170 million observational cells and more than 100 million perturbed cells from 70 cell lines	Virtual cell model whose transition module applies self-attention across sets of cells to predict responses to drugs, cytokines, and genetic perturbations.[36]

Virtual cell models

A "virtual cell" model aims to simulate how a cell behaves and how it changes when perturbed, so that experiments can be screened computationally before they are run in the laboratory. Perturbation datasets such as genome-scale Perturb-seq and Tahoe-100M supply examples of cause and effect; Arc has argued that perturbation data supports causal inference better than observational data alone.[18][19][36] The Arc Institute trained State on such data, and the Chan Zuckerberg Initiative's rBio uses predictions from TranscriptFormer as a reward signal to train a language model that answers questions about gene perturbations.[36][43] Funders have argued that current data volumes are too small. The Virtual Biology Initiative, launched by Biohub in April 2026, was set up because, in the words of Biohub head of science Alex Rives, accurate models need "orders of magnitude more data than exists today."[44]

Evaluation and criticism

Independent benchmarks have questioned how much these models add over simpler methods. A 2025 Genome Biology study of Geneformer and scGPT used without further training found that they could face reliability problems and could be outperformed by simpler methods in some zero-shot settings.[45] A 2025 Nature Methods study compared five foundation models and two other deep learning models against deliberately simple baselines for predicting transcriptome changes after single or double genetic perturbations, and none of the deep learning models outperformed the baselines.[46] Arc described State as the first model to consistently beat simple linear baselines on its benchmarks, a claim made by the developers.[36]

Limitations

Sparsity and "dropout." Each cell contains only a small amount of RNA, and many transcripts present in a cell go undetected. Most entries in a scRNA-seq count matrix are zero. Some zeros reflect genes that are not expressed, while others are technical failures to detect a transcript, often called dropouts; a 2018 analysis found that scRNA-seq produced more zeros than expected, especially for genes expressed at low levels, and that this technical variation differed from cell to cell.[47] Valentine Svensson argued in 2020 that droplet-based data are not zero-inflated, meaning that the zeros are consistent with ordinary count sampling rather than a separate failure process.[48]

Batch effects. Differences in sample handling, reagents, sequencing runs, and platforms introduce systematic variation that can be mistaken for biological differences, especially when batches are confounded with experimental conditions.[47] Integration methods attempt to correct for this, and combining data across studies remains one of the open problems of single-cell data science.[24][34] Standardized repositories such as CELLxGENE address part of the problem by requiring a common metadata schema and raw counts.[39]

Dissociation artifacts and lost spatial context. Breaking tissue into single-cell suspensions can itself change gene expression; a 2017 study found dissociation-induced gene expression in subpopulations of tissue cells.[49] Some tissues cannot be dissociated into intact cells at all, which is one reason for single-nucleus methods.[16] Dissociation also discards where each cell sat in the tissue, which spatial transcriptomics tries to recover.[25]

Destructive, single-time-point measurement. Cells are lysed to read their RNA, so each cell is measured once. The RNA velocity authors noted that scRNA-seq "captures only a static snapshot at a point in time," which makes dynamic processes such as development hard to study directly; trajectory and velocity methods infer dynamics from many cells sampled at different stages.[22][23]

Throughput, cost, and data volume. Microfluidics and combinatorial indexing, combined with falling sequencing costs, made experiments with millions of cells possible, but the resulting data volumes create their own computational problems.[24] For datasets at the scale sought for AI training, the Chan Zuckerberg Initiative said its industry partners in the Billion Cells Project were lowering costs and widening access to the necessary technology.[33]

See also

References

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Editing: Single-cell RNA sequencing