Fishing with Two Lines: A Hybrid Approach to Spatial Transcriptomic Discovery

Area of Science:

• Molecular Biology
• Genomics
• Biotechnology

Background:

• Spatial transcriptomics enables gene expression analysis within tissue context.
• Current methods face a trade-off between the number of genes analyzed and per-gene sensitivity.
• High-sensitivity panels assay fewer genes, while broad-coverage panels have lower sensitivity.

Purpose of the Study:

• To develop a novel dual chemistry method for spatial transcriptomics.
• To combine high sensitivity (Xenium V1 panel) and broad coverage (Prime 5K panel) on a single tissue section.
• To overcome the limitations of existing spatial transcriptomics approaches.

Main Methods:

• Developed a 'dual chemistry' approach by co-hybridizing Prime and Xenium V1 probes.
• Sequentially performed V1 and Prime decoding chemistries on the same tissue section.
• Validated the method on a human lung tissue microarray.

Main Results:

• Achieved high concordance between independent V1 and Prime chemistry runs and the dual chemistry approach.
• Observed similar expression patterns for overlapping genes in the dual run, confirming assay fidelity.
• Demonstrated successful integration of high sensitivity and broad coverage profiling.

Conclusions:

• The dual chemistry method effectively integrates high-sensitivity and broad-coverage spatial transcriptomics.
• This approach enhances cell retention and provides richer biological information.
• Enables both sensitive gene expression profiling and broader discovery in spatial transcriptomics studies.