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Laser Microdissection for Species-Agnostic Single-Tissue Applications
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Laser Microdissection for Species-Agnostic Single-Tissue Applications.

Alyssa Woronik1, Karin Kiontke2, Raya S Jallad2

  • 1Center for Developmental Genetics, New York University; Sacred Heart University.

Journal of Visualized Experiments : Jove
|April 18, 2022
PubMed
Summary

Laser microdissection (LMD) isolates nematode tail tips for gene expression studies without cell disruption. This method enables species-agnostic transcriptomic analysis of development, requiring minimal samples.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genomics

Background:

  • Single-cell transcriptomics offers powerful insights but often relies on species-specific genetic tools and can alter native gene expression.
  • Existing methods for isolating cells for transcriptomic analysis may disrupt tissue architecture and induce cellular stress responses.

Purpose of the Study:

  • To optimize laser microdissection (LMD) for isolating intact nematode tail tips for gene expression analysis.
  • To establish a protocol for single-cell RNA sequencing (scRNA-seq) of LMD-isolated tissues applicable across species.
  • To investigate gene expression during male tail tip morphogenesis in nematodes.

Main Methods:

  • Optimized laser microdissection (LMD) to isolate individual nematode tail tips, preserving native cellular environment.
  • Applied single-cell RNA sequencing (scRNA-seq) library preparation (CEL-Seq2) to LMD-isolated tissues.
  • Developed a method for synchronizing nematode development at 1-hour intervals to obtain sufficient samples.

Main Results:

  • LMD successfully isolates intact tissue without cellular disruption or requirement for species-specific genetic toolkits.
  • A power analysis indicated that as few as 70 tail tips per condition are sufficient for robust transcriptomic analysis.
  • The protocol is adaptable for any species with a well-annotated genome or transcriptome.

Conclusions:

  • LMD coupled with scRNA-seq provides a versatile and efficient method for studying gene expression in specific tissues during development.
  • This approach facilitates comparative transcriptomic studies across species to understand conserved and divergent developmental mechanisms.
  • The described synchronization method ensures the collection of adequate, developmentally synchronized samples for analysis.