--- title: Comparing Bulk RNA Sequencing and Ultrafast RNA-Seq description: Explore the advantages of bulk RNA sequencing and ultrafast RNA sequencing to determine the best method for your research needs. image: https://blog.genewiz.com/hubfs/Bulk%20RNA-Seq%20vs%20Ultrafast%20RNA-Seq%20Blog%20Image.jpg --- [![GENEWIZ](https://blog.genewiz.com/hubfs/GENEWIZ%20Brand%20Assets/GENEWIZ%20Logos/2025-04%20Current%20GENEWIZ%20Logos/GENEWIZ_Full-Color_Logo_PublicWeb_200x63.svg "GENEWIZ")](https://www.genewiz.com/) - Close Search [GENEWIZ Blog Homepage](https://blog.genewiz.com/) # Comparing Bulk RNA Sequencing and Ultrafast RNA-Seq [By GENEWIZ .](https://blog.genewiz.com/author/genewiz) May 06, 2026 0 Comments ![](https://blog.genewiz.com/hubfs/Bulk%20RNA-Seq%20vs%20Ultrafast%20RNA-Seq%20Blog%20Image.jpg) Comparing Bulk RNA Sequencing and Ultrafast RNA-Seq 6:14 [Follow us on LinkedIn](https://www.linkedin.com/company/genewiz/) [Follow us on X](https://x.com/GENEWIZSciences) [Follow us on Reddit](https://www.reddit.com/user/GENEWIZsciences/) [Follow us on Bluesky](https://bsky.app/profile/genewiz.bsky.social) [Follow us on YouTube](https://www.youtube.com/@GENEWIZ-from-Azenta) Unlock the potential of RNA sequencing by exploring the distinct advantages of bulk and ultrafast sequencing methods. ## Comparing Bulk and 3’ End Counting RNA Sequencing RNA sequencing (RNA-seq) technologies have revolutionized transcriptomics by enabling comprehensive profiling of gene expression and transcript diversity. Two prominent strategies have emerged: standard bulk RNA-seq and 3’ end counting RNA-seq (also known as DRUG-seq, GENEWIZ’s [High-Throughput Gene Expression Sequencing](https://www.genewiz.com/public/services/next-generation-sequencing/high-throughput-gene-expression-screening), and an alternative provider’s Ultrafast RNA Sequencing). Each approach offers unique advantages in terms of data depth, coverage, species applicability, and cost. **Due to advances in library preparation and sequencing technology, both methods can be processed in a matter of days.** | | **Bulk RNA-Seq** | **3' end counting** | | --- | --- | --- | | **Assay Type** | Total mRNA (PolyA capture) or total RNA (rRNA depletion) | 3' end-counting with PolyA capture | | **Organisms** | All Prokaryotes, Eukaryotes, RNA Viruses | Only Eukaryotes | | **What is captured** | **“Transcript-level detection”** mRNA or total RNA (mRNA, tRNA, & lncRNA) | **"Gene-level detection"** 3' end of polyA transcripts only | | **Depth/Data returned** | 20-50 M paired end reads (40-100 M total raw reads) | 2-5 M paired end reads (4-10 M total raw reads) | | **Best-fit Use Case** | - Comprehensive transcriptomics - Isoform discovery - Non-coding RNA - Bacteria, Tissue, Degraded/FFPE samples | - Gene counts - Rapid screening of high expressing genes | | **Key Limitations** | - Cost | - No transcript or isoform resolution - PolyA only - No bacteria - No tissue samples | | **Cost** | Starting at ~$100/Sample | Starting at ~$50/Sample | **Standard bulk RNA-seq, provides unparalleled coverage and sensitivity, making it the gold standard for comprehensive transcriptome analysis.** It involves sequencing of extracted mRNA or total RNA, either by polyA selection or rRNA depletion, respectively. Bulk RNA-seq can be applied to prokaryotes, eukaryotes and RNA viruses. Because the entire RNA transcript is sequenced, bulk RNA-seq can detect alternative splicing events, fusion genes, and novel isoforms. It offers flexibility in depth of sequencing; however, it tends to be deeper sequencing (typically 30 M+ paired end reads for most animals) to detect both abundant and rare transcripts. As a result, bulk RNA-seq is suitable for research into complex biological systems, novel insights, rare disease mechanisms, and biomarker discovery, while also being suitable for *de novo* transcriptome assembly in plants, animals, and bacteria. **3’ end counting RNA-seq is well-suited for studies where the detection of highly expressed genes is the main goal,** enabling high-level screening for major changes in expression including compound screening. This method provides **limited insight beyond gene counts** (no exon-level resolution). It is often coupled with cost reduction actions upstream, like direct from cell lysate library preparation, versus sequencing from extracted RNA, further constraining input sample types to animal cell pellets. By sequencing only the 3’ end of the polyadenylated transcript, fewer reads are needed per sample to capture gene-level detection; however, low-expressing genes may not be detected. Finally, 3’ end counting requires a reference transcriptome for analysis. ## Bulk RNA-Seq vs. 3’ End Counting: Factors to Consider Choosing between bulk and 3’ end counting RNA-seq should be guided by experimental objectives, sample type, and required analytical resolution. Bulk RNA-seq is recommended when comprehensive transcriptome coverage, discovery of novel features, or detection of rare transcripts are essential, as well as for any bacterial or plant-based RNA analysis. Conversely, 3’ end counting is ideal for large-scale screening of extracted RNA or animal cell pellets where cost is prioritized, at the sacrifice of transcript-level information. In the US, GENEWIZ also now offers bulk rna-seq as fast as five business days with our new [Lightning RNA-Seq service](https://www.genewiz.com/public/services/next-generation-sequencing/lightning-fast-rna-seq). 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