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Sci Rep. 2019 Jun 27;9(1):9358. doi: 10.1038/s41598-019-45750-7.

Lineage tracing analysis of cone photoreceptor associated cis-regulatory elements in the developing chicken retina.

Author information

1
Biology Ph.D. Program, Graduate Center, City University of New York, New York, NY, 10016, USA.
2
Department of Biology, The City College of New York, City University of New York, New York, NY, 10031, USA.
3
Division of Hematology and Medical Oncology, Laura and Isaac Perlmutter Cancer Center, New York University Langone Medical Center, New York, NY, 10016, USA.
4
Biology Ph.D. Program, Graduate Center, City University of New York, New York, NY, 10016, USA. memerson@ccny.cuny.edu.
5
Department of Biology, The City College of New York, City University of New York, New York, NY, 10031, USA. memerson@ccny.cuny.edu.
6
Biochemistry Ph.D. Program, Graduate Center, City University of New York, New York, NY, 10016, USA. memerson@ccny.cuny.edu.

Abstract

During vertebrate retinal development, transient populations of retinal progenitor cells with restricted cell fate choices are formed. One of these progenitor populations expresses the Thrb gene and can be identified by activity of the ThrbCRM1 cis-regulatory element. Short-term assays have concluded that these cells preferentially generate cone photoreceptors and horizontal cells, however developmental timing has precluded an extensive cell type characterization of their progeny. Here we describe the development and validation of a recombinase-based lineage tracing system for the chicken embryo to further characterize the lineage of these cells. The ThrbCRM1 element was found to preferentially form photoreceptors and horizontal cells, as well as a small number of retinal ganglion cells. The photoreceptor cell progeny are exclusively cone photoreceptors and not rod photoreceptors, confirming that ThrbCRM1 progenitor cells are restricted from the rod fate. In addition, specific subtypes of horizontal cells and retinal ganglion cells were overrepresented, suggesting that ThrbCRM1 progenitor cells are not only restricted for cell type, but for cell subtype as well.

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