C. elegans Runx/CBFβ suppresses POP-1 TCF to convert asymmetric to proliferative division of stem cell-like seam cells
A correct balance between proliferative and asymmetric cell divisions underlies normal development, stem cell maintenance and tissue homeostasis. What determines whether cells undergo symmetric or asymmetric cell division is poorly understood. To gain insight into the mechanisms involved, we studied...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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Company of Biologists
2019
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| _version_ | 1797071836899442688 |
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| author | Van Der Horst, S Cravo, J Woollard, A Teapal, J Van Den Heuvel, S |
| author_facet | Van Der Horst, S Cravo, J Woollard, A Teapal, J Van Den Heuvel, S |
| author_sort | Van Der Horst, S |
| collection | OXFORD |
| description | A correct balance between proliferative and asymmetric cell divisions underlies normal development, stem cell maintenance and tissue homeostasis. What determines whether cells undergo symmetric or asymmetric cell division is poorly understood. To gain insight into the mechanisms involved, we studied the stem cell-like seam cells in the Caenorhabditis elegans epidermis. Seam cells go through a reproducible pattern of asymmetric divisions, instructed by divergent canonical Wnt/β-catenin signaling, and symmetric divisions that increase the seam cell number. Using time-lapse fluorescence microscopy we observed that symmetric cell divisions maintain asymmetric localization of Wnt/β-catenin pathway components. Our observations, based on lineage-specific knockout and GFP-tagging of endogenous pop-1, support the model that POP-1TCF induces differentiation at a high nuclear level, whereas low nuclear POP-1 promotes seam cell self-renewal. Before symmetric division, the transcriptional regulator RNT-1Runx and cofactor BRO-1CBFβ temporarily bypass Wnt/β-catenin asymmetry by downregulating pop-1 expression. Thereby, RNT-1/BRO-1 appears to render POP-1 below the level required for its repressor function, which converts differentiation into self-renewal. Thus, we found that conserved Runx/CBFβ-type stem cell regulators switch asymmetric to proliferative cell division by opposing TCF-related transcriptional repression. |
| first_indexed | 2024-03-06T22:59:00Z |
| format | Journal article |
| id | oxford-uuid:616a644b-1300-4ce1-8bc6-a6e56102c225 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:59:00Z |
| publishDate | 2019 |
| publisher | Company of Biologists |
| record_format | dspace |
| spelling | oxford-uuid:616a644b-1300-4ce1-8bc6-a6e56102c2252022-03-26T17:59:49ZC. elegans Runx/CBFβ suppresses POP-1 TCF to convert asymmetric to proliferative division of stem cell-like seam cellsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:616a644b-1300-4ce1-8bc6-a6e56102c225EnglishSymplectic Elements at OxfordCompany of Biologists2019Van Der Horst, SCravo, JWoollard, ATeapal, JVan Den Heuvel, SA correct balance between proliferative and asymmetric cell divisions underlies normal development, stem cell maintenance and tissue homeostasis. What determines whether cells undergo symmetric or asymmetric cell division is poorly understood. To gain insight into the mechanisms involved, we studied the stem cell-like seam cells in the Caenorhabditis elegans epidermis. Seam cells go through a reproducible pattern of asymmetric divisions, instructed by divergent canonical Wnt/β-catenin signaling, and symmetric divisions that increase the seam cell number. Using time-lapse fluorescence microscopy we observed that symmetric cell divisions maintain asymmetric localization of Wnt/β-catenin pathway components. Our observations, based on lineage-specific knockout and GFP-tagging of endogenous pop-1, support the model that POP-1TCF induces differentiation at a high nuclear level, whereas low nuclear POP-1 promotes seam cell self-renewal. Before symmetric division, the transcriptional regulator RNT-1Runx and cofactor BRO-1CBFβ temporarily bypass Wnt/β-catenin asymmetry by downregulating pop-1 expression. Thereby, RNT-1/BRO-1 appears to render POP-1 below the level required for its repressor function, which converts differentiation into self-renewal. Thus, we found that conserved Runx/CBFβ-type stem cell regulators switch asymmetric to proliferative cell division by opposing TCF-related transcriptional repression. |
| spellingShingle | Van Der Horst, S Cravo, J Woollard, A Teapal, J Van Den Heuvel, S C. elegans Runx/CBFβ suppresses POP-1 TCF to convert asymmetric to proliferative division of stem cell-like seam cells |
| title | C. elegans Runx/CBFβ suppresses POP-1 TCF to convert asymmetric to proliferative division of stem cell-like seam cells |
| title_full | C. elegans Runx/CBFβ suppresses POP-1 TCF to convert asymmetric to proliferative division of stem cell-like seam cells |
| title_fullStr | C. elegans Runx/CBFβ suppresses POP-1 TCF to convert asymmetric to proliferative division of stem cell-like seam cells |
| title_full_unstemmed | C. elegans Runx/CBFβ suppresses POP-1 TCF to convert asymmetric to proliferative division of stem cell-like seam cells |
| title_short | C. elegans Runx/CBFβ suppresses POP-1 TCF to convert asymmetric to proliferative division of stem cell-like seam cells |
| title_sort | c elegans runx cbfβ suppresses pop 1 tcf to convert asymmetric to proliferative division of stem cell like seam cells |
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