Methods and compositions for cdna synthesis and single-cell transcriptome profiling using template switching reaction

Abstract

This application discloses methods for cDN'A synthesis with improved reverse transcription, template switching and preamplification to increase both yield and average length of cDNA libraries generated from individual cells. The new methods include exchanging a single nucleoside residue for a locked nucleic acid (INA) at the TSO 3′ end, using a methyl group donor, and/or a MgCb concentration higher than conventionally used. Single-cell transcriptome analyses incorporating these differences have full-length coverage, improved sensitivity and accuracy, have less bias and are more amendable to cost-effective automation. The invention also provides cDNA molecules comprising a locked nucleic acid at the 3′-end, compositions and cDNA libraries comprising these cDNA molecules, and methods for single-cell transcriptome profiling.