To preserve RNA in fresh tissue for spatial analysis, prepare the assay-specific freezing setup in advance, minimize the time between collection and freezing, and keep the sample frozen through storage and sectioning. Follow the current preparation guide for the exact assay: freezing and embedding requirements, tissue compatibility, and RNA-quality acceptance criteria are not universal.
Prepare for the assay before tissue collection
First identify the spatial assay and reagent-kit workflow you plan to use, then consult its current fresh-frozen tissue preparation guide and any tissue-specific laboratory SOP. Have the specified freezing setup, embedding materials, and cold tools ready before collection so the tissue can be processed without avoidable delay.
| # | Preview | Product | Price | |
|---|---|---|---|---|
| 1 |
|
20xTE Buffer (pH8.0, 500 ml) | $41.00 | Buy on Amazon |
As an Amazon Associate I earn from qualifying purchases.
There is no universal collection-to-freezing time limit established by the cited protocols. Do not infer one from a different assay or tissue type; minimize the unfrozen interval and follow the method validated for your workflow.
Freeze freshly collected tissue promptly
Snap-freeze the sample using the method specified by the assay. For its Visium workflow, 10x Genomics describes using an isopentane bath with liquid nitrogen. Its Tissue Preparation Guide warns against placing tissue directly into liquid nitrogen: the temperature difference may cause surface boiling, air pockets, uneven freezing, and morphological damage.
#1 Best Overall
That is guidance for the documented Visium workflow, not a universal freezing recipe. Confirm the current protocol for your assay and tissue rather than transferring a method across platforms.
Embed tissue according to the workflow
Optimal Cutting Temperature compound (OCT) is used in cited fresh-frozen workflows to preserve tissue structure and support cryosectioning. It is an embedding material, not a replacement for prompt freezing or careful cold-chain handling. The Xenium Fresh Frozen Tissue guide describes embedding frozen samples in OCT for these purposes.
The Visium guide allows freezing and embedding together or freezing first and embedding afterward. For thin tissue that tends to curl, simultaneous freezing and embedding may be useful. Choose only among sequences allowed by the current guide for your assay; embedding order should not be generalized from one workflow to another.
Free tools Windows power users keep installed
One-click scans. No signup required.
Keep samples and sections frozen
Maintain the frozen chain during block storage, sectioning, and RNA-quality sampling. For the documented Visium CytAssist workflow, 10x Genomics instructs users to pre-cool the tube, cooling block, and forceps, transfer collected sections to a pre-cooled tube, place the tube on dry ice, and store it at −80°C or extract RNA immediately. Do not let sections thaw during transfer.
These handling details come from the Visium CytAssist Fresh Frozen Tissue Preparation Guide. Use the relevant guide for other assays or kit versions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Assess RNA quality using the assay’s criteria
Check RNA quality before committing the sample to the assay, using the method and acceptance criteria in its preparation protocol. In the cited 2023 CytAssist guide, the workflow describes RNA isolation and RIN calculation with a BioAnalyzer or TapeStation; its stated proceed criterion is RIN ≥ 4. That threshold belongs to that documented protocol only. It is not a universal pass mark for spatial analysis, every tissue, or every laboratory.
RNA quality is only one part of suitability. Tissue type, morphology, freezing and embedding sequence, block handling, and slide processing can all affect performance. 10x Genomics’ tested-tissue guidance can help identify documented experience, but a listed tissue is not a guarantee of results for a particular specimen.
Confirm that the tissue preparation matches the assay
Fresh-frozen and formalin-fixed, paraffin-embedded (FFPE) tissue are distinct preparation workflows. The Visium FFPE Tissue Preparation Guide is for FFPE reagent kits; it must not be substituted for the snap-frozen/OCT Visium workflow. Before processing scarce material, verify that the assay generation, reagent kit, tissue type, and preparation guide are compatible.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
