UMIs are most useful for evaluating and removing PCR duplicates in the following cases:
Low input amounts (≤10 ng total RNA)
FFPE RNA
QuantSeq-Flex targeted RNA-Seq library prep (can be incorporated in custom primers – See QuantSeq-Flex V2 User Guide)
For very high sequencing depth (e.g., ≥30 M reads per sample. Note the recommended minimum read depth for QuantSeq is 3 – 4 M reads per sample).
UMIs are likely not required when input amounts are high (≥50 ng). For input amounts of 10 – 50 ng of total RNA, UMIs could be recommended for samples with reduced or variable RNA quality.
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