RT Journal Article SR Electronic T1 Northstar enables automatic classification of known and novel cell types from tumor samples JF bioRxiv FD Cold Spring Harbor Laboratory SP 820928 DO 10.1101/820928 A1 Fabio Zanini A1 Bojk A. Berghuis A1 Robert C. Jones A1 Benedetta Nicolis di Robilant A1 Rachel Yuan Nong A1 Jeffrey Norton A1 Michael F. Clarke A1 Stephen R. Quake YR 2020 UL http://biorxiv.org/content/early/2020/04/25/820928.abstract AB Single cell transcriptomics is revolutionising our understanding of tissue and disease heterogeneity, yet cell type identificationl remains a partially manual task. Published algorithms for automatic cell annotation are limited to known cell types and fail to capture novel populations, especially cancer cells. We developed northstar, a computational approach to classify thousands of cells based on published data within seconds while simultaneously identifying and highlighting new cell states such as malignancies. We tested northstar on human glioblastoma and melanoma and obtained high accuracy and robustness. We collected eleven pancreatic tumors and identified three shared and five private neoplastic cell populations, offering insight into the origins of neuroendocrine and exocrine tumors. northstar is a useful tool to assign known and novel cell type and states in the age of cell atlases.Competing Interest StatementThe authors have declared no competing interest.