Creative Biolabs is drawing attention to three complementary research approaches—single-cell RNA sequencing (scRNA-seq), single-nucleus RNA sequencing (snRNA-seq), and single-molecule fluorescence in situ hybridization (smFISH)—to address different questions in the study of cellular heterogeneity. The company’s announcement highlights a persistent challenge for biomedical laboratories: selecting a method that fits both the biological question and the available material. An approach suited to fresh cells may not be ideal for frozen tissue, and conventional dissociation-based RNA sequencing does not retain information about the subcellular location of individual RNA molecules.
For studies involving viable, dissociated cells, Creative Biolabs’ single-cell RNA sequencing service supports gene-expression analysis across individual cells. Its workflow encompasses experimental planning, cell isolation, library preparation, sequencing, and data analysis. These studies can help identify distinct cell populations, characterize expression signatures, and investigate heterogeneity in cancer, immunology, and developmental biology. However, tissue dissociation can introduce important limitations. Certain cells may be difficult to recover intact, while sample handling can alter transcriptional states.
For complex tissues, including brain specimens and samples that are difficult to dissociate, Creative Biolabs offers single-nucleus RNA sequencing. By analyzing isolated nuclei rather than intact cells, this approach can accommodate suitably preserved frozen tissues and reduce some dissociation-related biases. Sample suitability still depends on the preservation method and the quality of the recovered nuclei. The methods are not directly interchangeable. Whole-cell and nuclear RNA profiling capture different transcript populations, while tissue preservation, RNA integrity, and research objectives influence the information obtained. Nuclei isolation and transcript capture can also introduce method-specific biases. Selecting an appropriate method early can help align sample preparation with downstream analysis.
Sequencing can suggest that a gene is enriched in a particular cell population, but some follow-up questions require direct visualization. Creative Biolabs’ single-molecule FISH analysis service uses fluorescently labeled oligonucleotide probes to detect selected RNA molecules in fixed cells. This technique supports the investigation of transcript abundance and subcellular localization, providing a targeted perspective alongside sequencing-based findings. Unlike transcriptome-wide sequencing, conventional smFISH typically examines preselected RNA targets and requires careful probe design and appropriate controls, imaging, and image analysis. Its value lies in focused questions, such as determining whether a transcript is present in particular cells or where it accumulates within them, rather than replacing broad discovery profiling.
Together, these approaches give researchers different options for studying cellular heterogeneity. A project might use single-cell RNA sequencing to characterize accessible cells, select single-nucleus profiling when intact-cell recovery is problematic, or apply smFISH to examine the localization of priority transcripts. The appropriate strategy depends on sample suitability and the research hypothesis. By offering distinct profiling and visualization services, Creative Biolabs supports researchers in selecting approaches suited to their experimental objectives. The emphasis on method selection matters because mismatches between sample type and profiling technique can waste precious material and yield misleading results. For the broader research community, the availability of clearly differentiated services may help laboratories design more robust single-cell studies, particularly when working with frozen or difficult-to-dissociate tissues. All services are intended for research use only, not for diagnostic or therapeutic purposes.
