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Related Concept Videos

RNA-seq03:21

RNA-seq

RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases. 
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...

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A mannitol-based buffer improves single-cell RNA sequencing of high-salt marine cells.

Tal D Scully1, Allon M Klein2

  • 1Department of Systems Biology, Harvard Medical School, Boston, MA, USA.

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|December 1, 2025
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Summary

A new low-salinity buffer (PBS-M) improves single-cell RNA sequencing (scRNA-seq) for marine organisms. This method reduces cell death and ambient RNA, enabling discovery of new cell states in tunicates.

Keywords:
Data qualityInvertebrateMarineOsmoconformersOsmolarityscRNA-seq

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Area of Science:

  • Marine biology
  • Genomics
  • Cell biology

Background:

  • Single-cell RNA sequencing (scRNA-seq) is a powerful tool for discovering novel cell states.
  • Marine organisms present unique challenges for scRNA-seq due to salinity incompatibility.
  • Existing methods can lead to poor data quality and limited cell representation in marine species.

Purpose of the Study:

  • To develop a protocol for high-quality scRNA-seq in marine organisms.
  • To address challenges posed by high salinity environments on cell viability.
  • To improve cell representation and data quality for transcriptomic profiling.

Main Methods:

  • Developed a low-salinity phosphate buffer supplemented with D-mannitol (PBS-M).
  • Applied PBS-M to blood cells from the tunicate Ciona robusta for scRNA-seq.
  • Validated the PBS-M protocol in a second tunicate species.

Main Results:

  • PBS-M significantly improved scRNA-seq data quality in tunicates.
  • The buffer reduced cell death and minimized ambient mRNA contamination.
  • Novel cell states, previously undetectable, were revealed using PBS-M.
  • Protocol effectiveness was confirmed in a second marine tunicate species.

Conclusions:

  • PBS-M is an effective simple modification for enhancing scRNA-seq in marine organisms.
  • This protocol can overcome salinity-related barriers in marine single-cell genomics.
  • The method has broad potential for advancing research in diverse marine species.