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PRISM: A Progenitor-Restricted Intersectional Fate Mapping Approach Redefines Forebrain Lineages

Overview
Journal Dev Cell
Publisher Cell Press
Date 2020 Jun 24
PMID 32574593
Citations 7
Authors
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Abstract

Lineage tracing aims to identify the progeny of a defined population of dividing progenitor cells, a daunting task in the developing central nervous system where thousands of cell types are generated. In mice, lineage analysis has been accomplished using Cre recombinase to indelibly label a defined progenitor population and its progeny. However, the interpretation of historical recombination events is hampered by the fact that driver genes are often expressed in both progenitors and postmitotic cells. Genetically inducible approaches provide temporal specificity but are afflicted by mosaicism and toxicity. Here, we present PRISM, a progenitor-restricted intersectional fate mapping approach in which Flp recombinase expression is both dependent on Cre and restricted to neural progenitors, thus circumventing the aforementioned confounds. This tool can be used in conjunction with existing Cre lines making it broadly applicable. We applied PRISM to resolve two developmentally important, but contentious, lineages-Shh and Cux2.

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