Single-Cell FLASH-seq Kits
for high-sensitivity full-length single-cell RNA-seq

Ultra-sensitive, plate-based single-cell RNA-seq library preparation for FACS-sorted cells, with full-length mRNA transcript coverage for rare cell detection, isoform analysis, and alternative splicing studies.

Library preparation kits for Illumina® and AVITI™ sequencers.

Discover Sample Datasets

PBMCs, HEK293

MERCURIUS Single-Cell FLASH-seq full-length single-cell RNA-seq kit

Ultra-sensitive gene detection

For rare cell populations

Full-length transcript coverage

Automation-ready plate-based workflow

Product Overview

Full-length single-cell RNA-seq is useful when gene-level expression alone is not enough. Compared with 3′ or 5′ counting approaches, full-length methods provide broader transcript coverage, helping researchers study isoform diversity, alternative splicing, gene-body coverage, expressed variants, fusion transcripts, and low-abundance genes in individual cells.

MERCURIUS™ Single-Cell FLASH-seq brings this full-length readout into an automation-friendly 96- or 384-well plate-based workflow for sorted cells.

extraction steps needed
Down to 0 RNA
preps in a single tube
Up to 384
genes detected
at 0.5M reads/sample
11,000 +
library prep workflow
Down to 0 day

Applications for full-length single-cell RNA-seq

  • Rare cell population profiling
    Study FACS-sorted rare cell populations with high-sensitivity single-cell gene detection.
  • Immunology and immune cell states
    Profile antigen-specific T cells, exhausted T cells, rare immune subsets, and heterogeneous PBMC populations.
  • Cancer and tumor heterogeneity
    Analyze rare tumor subpopulations, circulating tumor cells, cancer stem cells, fusion transcripts, and therapy-resistant cell states.
  • Neuroscience and developmental biology
    Characterize rare neuronal or glial subtypes where transcript coverage and sensitivity are important.
  • Isoform and alternative splicing analysis
    Use full-length transcript coverage to study transcript structure beyond 3′/5′ gene counting.
  • Low-abundance transcript detection
    Capture weak but biologically meaningful signals in single cells with limited RNA content.
MERCURIUS Single-Cell FLASH-seq full-length single-cell RNA-seq kit

MERCURIUS™ FLASH-seq Detects More Genes Than Smart-seq3 and Smart-seq2 with Greater Consistency

FLASH-seq detects a median of approximately 11,000 genes per sample in HEK293T cells, outperforming Smart-seq3 and Smart-seq2 after downsampling all to 500k reads/sample.

The Sensitivity Of MERCURIUS™ FLASH-Seq Is Retained Even In Highly Heterogeneous Populations​

Number of genes detected in human PBMCs, processed with different protocols, and the number of reads downsampled to 125,000 raw reads. ​

MERCURIUS™ FLASH-Seq Is A Full-Length ScRNA-Seq Protocol ​

Gene body coverage shows a uniform read distribution across the entire gene body for the FLASH-seq protocol.

MERCURIUS™ FLASH-Seq Can Discriminate Rare Cell Populations In Heterogeneous Samples ​

UMAP of hPBMC, automatically annotated using Azimuth (Hao et al, 2021).

Sample Datasets

PBMCs

Number of samples:
96
Reads per sample in demo dataset:
10'000 reads

To have access to the deep-sequenced dataset (9.5M reads per sample) contact us.

Demo dataset file size:
79.9 MB

HEK293

Number of samples:
191
Reads per sample in demo dataset:
250'000 reads
Demo dataset file size:
4.9 GiB

Product documentation​

User guide

Publications

2025
Tarek Elmzzahi, Chun-Hsi Su, Mehrnoush Hadaddzadeh Shakiba, Doaa Hamada, DaryaMalko, Maren Koehne, Aleksej Frolov, Teisha Mason, Yuanfang Li, Rebekka Scholz, Collins Osei-Sarpong, Leonie Heyden, Jonas Schulte-Schrepping, Lorenzo Bonaguro, Kristian Haendler, Vassiliki Boussiotis, Annett Halle, Elena De Domenico, Daniel HDGray, Martin Fuhrmann, Zeinab Abdullah, Axel Kallies, Kevin Man, Marc D. Beyer.
2025
Akisawa Satomi, Riho Saito, Tadahaya Mizuno, Hiroki Sugishita, Hideki Ukai, Shigeyuki Shichino, Masashi Yanagisawa, Kouji Matsushima, Yukiko Gotoh, Tomohiko Okazaki.
2022
Hahaut, V., Pavlinic, D., Carbone, W et al.,

Application

full-length mRNA sequencing for single-cell

Equipment compatibility

Illumina, AVITI and Ultima Genomics instruments

Species compatibility

All eukaryotic species

Available formats

96 and 384 preps

Shipping conditions

Dry ice

Storage conditions

-20C

We do not recommend very large cells, such as cardiomyocytes, or any other cell type incompatible with the FACS sorting step.

MERCURIUS™ FLASH-seq is a plate-based method that focuses on polyadenylated RNA, which includes most mRNAs. It provides detailed information on gene structure and alternative splicing. Its ability to capture full-length mRNA transcripts and detect low-abundance genes makes it a powerful tool for gene expression profiling.

Read more about the technology in our blog posts: here and here

FLASH-seq is a plate-based full-length single-cell RNA-seq method designed to improve sensitivity, consistency, and workflow efficiency compared with earlier full-length scRNA-seq methods.

We have significantly enhanced the original FLASH-seq method to offer a streamlined workflow and superior data output. This plate-based technology (available in 96- and 384-well formats) features a novel, non-toxic tagmentation buffer and delivers ultra-sensitive gene detection, capturing up to two times more genes compared to other commercially available solutions.

Immunology
FLASH-seq is ideal for studying rare immune cell populations, such as antigen-specific T cells or exhausted T cell subsets in chronic infections and cancer. Its high sensitivity allows researchers to capture subtle transcriptomic differences, splicing events, and even intracellular viral transcripts at the single-cell level.
Cancer
Dissect tumor heterogeneity by sequencing rare cancer stem cells or circulating tumor cells. FLASH-seq enables detection of expressed mutations, splicing isoforms, and gene fusions, providing deep insights into clonal evolution and therapeutic resistance in individual cancer cells.
Neurobiology
In complex tissues like the brain, FLASH-seq empowers researchers to analyze rare neuronal subtypes or glial cells with high resolution. It reveals alternative splicing events and single-nucleotide variants that may be critical in neurodevelopmental or neurodegenerative disorders.
Genetic Therapies & ASOs
FLASH-seq can be used to assess the impact of antisense oligonucleotides (ASOs) on target splicing at single-cell resolution. This enables precise tracking of treatment efficacy across rare or responsive cell subsets within a population.
Intracellular Pathogens
Detect intracellular viral RNA in infected cells—even when those cells are extremely rare. FLASH-seq allows you to simultaneously monitor host responses and viral transcript presence, crucial for studying latent infections or early-stage viral spread.

 

The MERCURIUS™ FLASH-seq protocol is fully compatible with whole FACS-sorted cells. 

We do not recommend very large cells, such as the cardiomyocytes, as they are not compatible with the FACS sorting step.

For optimal results, we require the cells to be directly FACS-sorted in the dedicated well plates. The 96- and 384-plates contain the lysis buffer. It is important for the user to sort the cells in the middle of the well. Please refer to the User Guide and the Sample Submission Guidelines for more details.  

The average recommended sequencing depth is 250’000 reads/cell.

A full-length single-cell RNA-seq kit prepares sequencing libraries from individual cells while preserving transcript coverage across the gene body, enabling analysis beyond 3′ or 5′ gene counting.

Choose FLASH-seq when your study requires high sensitivity, sorted-cell control, rare cell analysis, isoform information, alternative splicing analysis, or full-length transcript coverage. Droplet-based methods are often better when the main goal is to profile very large numbers of cells.

Ask your question:

Kit Name

Catalog number
Total preps
Species compatibility​

MERCURIUS™ Single Cell FLASH-seq library prep kit (96 preps)

#10921
96
Human, mouse, rat,
all eukaryotic species

MERCURIUS™ Single Cell FLASH-seq library prep kit (384 preps)

#10923
384
Human, mouse, rat,
all eukaryotic species

Accessories

Product

Catalog number

Number of Samples

MERCURIUS™ Cell lysis module

#10351
96

MERCURIUS™ Cell lysis module

#10352
384

Relevant blogs

August 27, 2025

Single-cell RNA sequencing (scRNA-seq) has revolutionized our ability to examine the cellular heterogeneity of complex samples, identify new cell types, and explore transcriptional regulation at…

July 28, 2025

The Smart-seq2 protocol was the gold standard for full-length plate-based single-cell RNA-seq, offering superior sensitivity and the transcript coverage necessary to detect splice isoforms, allelic…

June 19, 2025

Lausanne, Switzerland and Frederick, MD – June 19, 2025 – Alithea Genomics, a pioneering biotech company based in Switzerland and the USA specializing in high-throughput…

Interested in ordering MERCURIUS™ RNA-seq kits?