Unique molecular identifier

Unique molecular identifiers (UMIs), or molecular barcodes (MBC) are short sequences or molecular "tags" added to DNA fragments in some next generation sequencing library preparation protocols to identify the input DNA molecule. These tags are added before PCR amplification, and can be used to reduce errors and quantitative bias introduced by the amplification.

Applications include variant calling in ctDNA, gene expression in single-cell RNA-seq (scRNA-seq)[1][2] and haplotyping via linked reads.

See also

References
  1. Kivioja T, Vähärautio A, Karlsson K, Bonke M, Enge M, Linnarsson S, Taipale J (2012). "Counting absolute numbers of molecules using unique molecular identifiers". Nat. Methods. 9 (1): 72–4. doi:10.1038/nmeth.1778. PMID 22101854. S2CID 39225091.
  2. Islam S, Zeisel A, Joost S, La Manno G, Zajac P, Kasper M, Lönnerberg P, Linnarsson S (2014). "Quantitative single-cell RNA-seq with unique molecular identifiers". Nat. Methods. 11 (2): 163–6. doi:10.1038/nmeth.2772. PMID 24363023. S2CID 6765530.
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