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Whole organism lineage tracing by combinatorial and cumulative genome editing

By Aaron McKenna, Gregory M Findlay, James A Gagnon, Marshall S. Horwitz, Alexander Franz F Schier, Jay Shendure

Posted 11 May 2016
bioRxiv DOI: 10.1101/052712 (published DOI: 10.1126/science.aaf7907)

Multicellular systems develop from single cells through a lineage, but current lineage tracing approaches scale poorly to whole organisms. Here we use genome editing to progressively introduce and accumulate diverse mutations in a DNA barcode over multiple rounds of cell division. The barcode, an array of CRISPR/Cas9 target sites, records lineage relationships in the patterns of mutations shared between cells. In cell culture and zebrafish, we show that rates and patterns of editing are tunable, and that thousands of lineage-informative barcode alleles can be generated. By sampling hundreds of thousands of cells from individual zebrafish, we find that most cells in adult zebrafish organs derive from relatively few embryonic progenitors. Genome editing of synthetic target arrays for lineage tracing (GESTALT) will help generate large-scale maps of cell lineage in multicellular systems.

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