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2 Publications

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    Espinosa Medina LabFly Facility
    12/01/20 | A programmable sequence of reporters for lineage analysis.
    Garcia-Marques J, Isabel Espinosa Medina , Ku K, Yang C, Koyama M, Yu H, Lee T
    Nature Neuroscience. 2020 Dec 01;23(12):1618-28. doi: 10.1038/s41593-020-0676-9

    We present CLADES (cell lineage access driven by an edition sequence), a technology for cell lineage studies based on CRISPR-Cas9 techniques. CLADES relies on a system of genetic switches to activate and inactivate reporter genes in a predetermined order. Targeting CLADES to progenitor cells allows the progeny to inherit a sequential cascade of reporters, thereby coupling birth order to reporter expression. This system, which can also be temporally induced by heat shock, enables the temporal resolution of lineage development and can therefore be used to deconstruct an extended cell lineage by tracking the reporters expressed in the progeny. When targeted to the germ line, the same cascade progresses across animal generations, predominantly marking each generation with the corresponding combination of reporters. CLADES therefore offers an innovative strategy for making programmable cascades of genes that can be used for genetic manipulation or to record serial biological events.

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    Espinosa Medina Lab
    11/26/20 | The art of lineage tracing: from worm to human.
    Garcia-Marques J, Isabel Espinosa Medina , Lee T
    Progress in Neurobiology. 2020 Nov 26:101966. doi: 10.1016/j.pneurobio.2020.101966

    Reconstructing the genealogy of every cell that makes up an organism remains a long-standing challenge in developmental biology. Besides its relevance for understanding the mechanisms underlying normal and pathological development, resolving the lineage origin of cell types will be crucial to create these types on-demand. Multiple strategies have been deployed towards the problem of lineage tracing, ranging from direct observation to sophisticated genetic approaches. Here we discuss the achievements and limitations of past and current technology. Finally, we speculate about the future of lineage tracing and how to reach the next milestones in the field.

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