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Modeling binary and graded cone cell fate patterning in the mouse retina

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  • Kiara C Eldred
  • Cameron Avelis
  • Robert J Johnston Jr
  • Elijah Roberts

Abstract

Nervous systems are incredibly diverse, with myriad neuronal subtypes defined by gene expression. How binary and graded fate characteristics are patterned across tissues is poorly understood. Expression of opsin photopigments in the cone photoreceptors of the mouse retina provides an excellent model to address this question. Individual cones express S-opsin only, M-opsin only, or both S-opsin and M-opsin. These cell populations are patterned along the dorsal-ventral axis, with greater M-opsin expression in the dorsal region and greater S-opsin expression in the ventral region. Thyroid hormone signaling plays a critical role in activating M-opsin and repressing S-opsin. Here, we developed an image analysis approach to identify individual cone cells and evaluate their opsin expression from immunofluorescence imaging tiles spanning roughly 6 mm along the D-V axis of the mouse retina. From analyzing the opsin expression of ~250,000 cells, we found that cones make a binary decision between S-opsin only and co-expression competent fates. Co-expression competent cells express graded levels of S- and M-opsins, depending nonlinearly on their position in the dorsal-ventral axis. M- and S-opsin expression display differential, inverse patterns. Using these single-cell data, we developed a quantitative, probabilistic model of cone cell decisions in the retinal tissue based on thyroid hormone signaling activity. The model recovers the probability distribution for cone fate patterning in the mouse retina and describes a minimal set of interactions that are necessary to reproduce the observed cell fates. Our study provides a paradigm describing how differential responses to regulatory inputs generate complex patterns of binary and graded cell fates.Author summary: The development of a cell in a mammalian tissue is governed by a complex regulatory network that responds to many input signals to give the cell a distinct identity, a process referred to as cell-fate specification. Some of these cell fates have binary on-or-off gene expression patterns, while others have graded gene expression that changes across the tissue. Differentiation of the photoreceptor cells that sense light in the mouse retina provides a good example of this process. Here, we explore how complex patterns of cell fates are specified in the mouse retina by building a computational model based on analysis of a large number of photoreceptor cells from microscopy images of whole retinas. We use the data and the model to study what exactly it means for a cell to have a binary or graded cell fate and how these cell fates can be distinguished from each other. Our study shows how tens-of-thousands of individual photoreceptor cells can be patterned across a complex tissue by a regulatory network, creating a different outcome depending upon the received inputs.

Suggested Citation

  • Kiara C Eldred & Cameron Avelis & Robert J Johnston Jr & Elijah Roberts, 2020. "Modeling binary and graded cone cell fate patterning in the mouse retina," PLOS Computational Biology, Public Library of Science, vol. 16(3), pages 1-25, March.
  • Handle: RePEc:plo:pcbi00:1007691
    DOI: 10.1371/journal.pcbi.1007691
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    References listed on IDEAS

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    1. Andre Olsson & Meenakshi Venkatasubramanian & Viren K. Chaudhri & Bruce J. Aronow & Nathan Salomonis & Harinder Singh & H. Leighton Grimes, 2016. "Single-cell analysis of mixed-lineage states leading to a binary cell fate choice," Nature, Nature, vol. 537(7622), pages 698-702, September.
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