Depending on the sample type, either total RNA, DNA, or isolated immune cells (DirectCell™ Protocol) can be used as inputs for the DriverMap AIR Assay. No preliminary poly(A) selection or ribosomal/mitochondrial/globin RNA depletion is required for RNA samples:

  • For the AIR RNA assay, the table below describes the optimal input amount and range of total RNA purified from different biological samples. As illustrated in Fig. 14, using less than the optimal amount of RNA could reduce reproducibility in detecting medium-abundant clonotypes.
  • For bulk tissue, blood, or cell samples with more than ~50,000 cells, purify RNA and DNA using conventional protocols (e.g., as recommended in the AIR manual). For biological samples with a small number of cells—less than ~50,000 cells (e.g., sorted immune cells) or blood and tissue microsamples—we recommend using the immune cells directly as input as described in the DirectCell Protocol.
  • For the AIR DNA assay, the general rule for quantitating high- and medium-abundant clonotypes is to use at least 5-10 µg of DNA corresponding to approximately 1 million cells. Using a smaller amount of DNA (0.5-2 µg) would reduce the detection of medium-abundant clonotypes, and even lower amounts (0.1-0.5 µg) would also reduce the sensitivity of high-abundant clonotypes (Fig. 14). Considering the reduced sensitivity of the AIR DNA assay due to the low copy number of starting DNA molecules, technical replicates are highly recommended.
RNA Prep Protocol > 50,000 cells
Sample Type Optimal Range (total RNA)
Whole blood 100 ng 5-200 ng
PBMC 50 ng 2-100 ng
T/B Cell fractions 25 ng 1-100 ng
Lymphoid Tissue (fresh/frozen) 100 ng 5-100 ng
Cancer biopsies 500 ng 20-1,000 ng
Non-lymphoid tissues 1,000 ng 50-2,000 ng
FFPE tissues 1,000 ng 50-2,000 ng
DirectCell AIR RNA Protocol < 50,000 cells
Sample Type Optimal Range (total RNA)
Cell fractions N/A 500 – 50,000 cells
Tissue (fresh/frozen) N/A up to 1 mg
Blood Microsamples N/A 30 ul
Last modified: 8 March 2023

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