--- _id: '11478' abstract: - lang: eng text: Cerebral organoids differentiated from human-induced pluripotent stem cells (hiPSC) provide a unique opportunity to investigate brain development. However, organoids usually lack microglia, brain-resident immune cells, which are present in the early embryonic brain and participate in neuronal circuit development. Here, we find IBA1+ microglia-like cells alongside retinal cups between week 3 and 4 in 2.5D culture with an unguided retinal organoid differentiation protocol. Microglia do not infiltrate the neuroectoderm and instead enrich within non-pigmented, 3D-cystic compartments that develop in parallel to the 3D-retinal organoids. When we guide the retinal organoid differentiation with low-dosed BMP4, we prevent cup development and enhance microglia and 3D-cysts formation. Mass spectrometry identifies these 3D-cysts to express mesenchymal and epithelial markers. We confirmed this microglia-preferred environment also within the unguided protocol, providing insight into microglial behavior and migration and offer a model to study how they enter and distribute within the human brain. acknowledged_ssus: - _id: Bio - _id: LifeSc acknowledgement: We thank the scientific service units at ISTA, specifically the lab support facility and imaging & optics facility for their support; Nicolas Armel for performing the Mass Spectrometry. We thank Alexandra Lang and Tanja Peilnsteiner for their help in human brain tissue collection, Rouven Schulz for his insights into the functional assays We thank all members of the Siegert group for constant feedback on the project and Margaret Maes, Rouven Schulz, and Marco Benevento for feedback on the manuscript. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant No. 715571 to S.S.) and from the Gesellschaft für Forschungsförderung Niederösterreich (grant No. Sc19-017 to V.H.). article_number: '104580' article_processing_charge: Yes article_type: original author: - first_name: Katarina full_name: Bartalska, Katarina id: 4D883232-F248-11E8-B48F-1D18A9856A87 last_name: Bartalska - first_name: Verena full_name: Hübschmann, Verena id: 32B7C918-F248-11E8-B48F-1D18A9856A87 last_name: Hübschmann - first_name: Medina full_name: Korkut, Medina id: 4B51CE74-F248-11E8-B48F-1D18A9856A87 last_name: Korkut orcid: 0000-0003-4309-2251 - first_name: Ryan J full_name: Cubero, Ryan J id: 850B2E12-9CD4-11E9-837F-E719E6697425 last_name: Cubero orcid: 0000-0003-0002-1867 - first_name: Alessandro full_name: Venturino, Alessandro id: 41CB84B2-F248-11E8-B48F-1D18A9856A87 last_name: Venturino orcid: 0000-0003-2356-9403 - first_name: Karl full_name: Rössler, Karl last_name: Rössler - first_name: Thomas full_name: Czech, Thomas last_name: Czech - first_name: Sandra full_name: Siegert, Sandra id: 36ACD32E-F248-11E8-B48F-1D18A9856A87 last_name: Siegert orcid: 0000-0001-8635-0877 citation: ama: Bartalska K, Hübschmann V, Korkut M, et al. A systematic characterization of microglia-like cell occurrence during retinal organoid differentiation. iScience. 2022;25(7). doi:10.1016/j.isci.2022.104580 apa: Bartalska, K., Hübschmann, V., Korkut, M., Cubero, R. J., Venturino, A., Rössler, K., … Siegert, S. (2022). A systematic characterization of microglia-like cell occurrence during retinal organoid differentiation. IScience. Elsevier. https://doi.org/10.1016/j.isci.2022.104580 chicago: Bartalska, Katarina, Verena Hübschmann, Medina Korkut, Ryan J Cubero, Alessandro Venturino, Karl Rössler, Thomas Czech, and Sandra Siegert. “A Systematic Characterization of Microglia-like Cell Occurrence during Retinal Organoid Differentiation.” IScience. Elsevier, 2022. https://doi.org/10.1016/j.isci.2022.104580. ieee: K. Bartalska et al., “A systematic characterization of microglia-like cell occurrence during retinal organoid differentiation,” iScience, vol. 25, no. 7. Elsevier, 2022. ista: Bartalska K, Hübschmann V, Korkut M, Cubero RJ, Venturino A, Rössler K, Czech T, Siegert S. 2022. A systematic characterization of microglia-like cell occurrence during retinal organoid differentiation. iScience. 25(7), 104580. mla: Bartalska, Katarina, et al. “A Systematic Characterization of Microglia-like Cell Occurrence during Retinal Organoid Differentiation.” IScience, vol. 25, no. 7, 104580, Elsevier, 2022, doi:10.1016/j.isci.2022.104580. short: K. Bartalska, V. Hübschmann, M. Korkut, R.J. Cubero, A. Venturino, K. Rössler, T. Czech, S. Siegert, IScience 25 (2022). date_created: 2022-07-03T22:01:33Z date_published: 2022-07-15T00:00:00Z date_updated: 2023-11-02T12:21:33Z day: '15' ddc: - '610' department: - _id: SaSi doi: 10.1016/j.isci.2022.104580 ec_funded: 1 external_id: isi: - '000830428500005' file: - access_level: open_access checksum: a470b74e1b3796c710189c81a4cd4329 content_type: application/pdf creator: cchlebak date_created: 2022-07-04T08:19:25Z date_updated: 2022-07-04T08:19:25Z file_id: '11480' file_name: 2022_iScience_Bartalska.pdf file_size: 19400048 relation: main_file success: 1 file_date_updated: 2022-07-04T08:19:25Z has_accepted_license: '1' intvolume: ' 25' isi: 1 issue: '7' language: - iso: eng month: '07' oa: 1 oa_version: Published Version project: - _id: 25D4A630-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '715571' name: Microglia action towards neuronal circuit formation and function in health and disease - _id: B67AFEDC-15C9-11EA-A837-991A96BB2854 name: IST Austria Open Access Fund - _id: 9B99D380-BA93-11EA-9121-9846C619BF3A grant_number: SC19-017 name: How human microglia shape developing neurons during health and inflammation publication: iScience publication_identifier: eissn: - 2589-0042 publication_status: published publisher: Elsevier quality_controlled: '1' related_material: record: - id: '12117' relation: other status: public scopus_import: '1' status: public title: A systematic characterization of microglia-like cell occurrence during retinal organoid differentiation tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87 volume: 25 year: '2022' ... --- _id: '6412' abstract: - lang: eng text: Polycomb group (PcG) proteins play critical roles in the epigenetic inheritance of cell fate. The Polycomb Repressive Complexes PRC1 and PRC2 catalyse distinct chromatin modifications to enforce gene silencing, but how transcriptional repression is propagated through mitotic cell divisions remains a key unresolved question. Using reversible tethering of PcG proteins to ectopic sites in mouse embryonic stem cells, here we show that PRC1 can trigger transcriptional repression and Polycomb-dependent chromatin modifications. We find that canonical PRC1 (cPRC1), but not variant PRC1, maintains gene silencing through cell division upon reversal of tethering. Propagation of gene repression is sustained by cis-acting histone modifications, PRC2-mediated H3K27me3 and cPRC1-mediated H2AK119ub1, promoting a sequence-independent feedback mechanism for PcG protein recruitment. Thus, the distinct PRC1 complexes present in vertebrates can differentially regulate epigenetic maintenance of gene silencing, potentially enabling dynamic heritable responses to complex stimuli. Our findings reveal how PcG repression is potentially inherited in vertebrates. article_number: '1931' article_processing_charge: No author: - first_name: Hagar F. full_name: Moussa, Hagar F. last_name: Moussa - first_name: Daniel full_name: Bsteh, Daniel last_name: Bsteh - first_name: Ramesh full_name: Yelagandula, Ramesh last_name: Yelagandula - first_name: Carina full_name: Pribitzer, Carina last_name: Pribitzer - first_name: Karin full_name: Stecher, Karin last_name: Stecher - first_name: Katarina full_name: Bartalska, Katarina id: 4D883232-F248-11E8-B48F-1D18A9856A87 last_name: Bartalska - first_name: Luca full_name: Michetti, Luca last_name: Michetti - first_name: Jingkui full_name: Wang, Jingkui last_name: Wang - first_name: Jorge A. full_name: Zepeda-Martinez, Jorge A. last_name: Zepeda-Martinez - first_name: Ulrich full_name: Elling, Ulrich last_name: Elling - first_name: Jacob I. full_name: Stuckey, Jacob I. last_name: Stuckey - first_name: Lindsey I. full_name: James, Lindsey I. last_name: James - first_name: Stephen V. full_name: Frye, Stephen V. last_name: Frye - first_name: Oliver full_name: Bell, Oliver last_name: Bell citation: ama: Moussa HF, Bsteh D, Yelagandula R, et al. Canonical PRC1 controls sequence-independent propagation of Polycomb-mediated gene silencing. Nature Communications. 2019;10(1). doi:10.1038/s41467-019-09628-6 apa: Moussa, H. F., Bsteh, D., Yelagandula, R., Pribitzer, C., Stecher, K., Bartalska, K., … Bell, O. (2019). Canonical PRC1 controls sequence-independent propagation of Polycomb-mediated gene silencing. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-019-09628-6 chicago: Moussa, Hagar F., Daniel Bsteh, Ramesh Yelagandula, Carina Pribitzer, Karin Stecher, Katarina Bartalska, Luca Michetti, et al. “Canonical PRC1 Controls Sequence-Independent Propagation of Polycomb-Mediated Gene Silencing.” Nature Communications. Springer Nature, 2019. https://doi.org/10.1038/s41467-019-09628-6. ieee: H. F. Moussa et al., “Canonical PRC1 controls sequence-independent propagation of Polycomb-mediated gene silencing,” Nature Communications, vol. 10, no. 1. Springer Nature, 2019. ista: Moussa HF, Bsteh D, Yelagandula R, Pribitzer C, Stecher K, Bartalska K, Michetti L, Wang J, Zepeda-Martinez JA, Elling U, Stuckey JI, James LI, Frye SV, Bell O. 2019. Canonical PRC1 controls sequence-independent propagation of Polycomb-mediated gene silencing. Nature Communications. 10(1), 1931. mla: Moussa, Hagar F., et al. “Canonical PRC1 Controls Sequence-Independent Propagation of Polycomb-Mediated Gene Silencing.” Nature Communications, vol. 10, no. 1, 1931, Springer Nature, 2019, doi:10.1038/s41467-019-09628-6. short: H.F. Moussa, D. Bsteh, R. Yelagandula, C. Pribitzer, K. Stecher, K. Bartalska, L. Michetti, J. Wang, J.A. Zepeda-Martinez, U. Elling, J.I. Stuckey, L.I. James, S.V. Frye, O. Bell, Nature Communications 10 (2019). date_created: 2019-05-13T07:58:35Z date_published: 2019-04-29T00:00:00Z date_updated: 2023-08-25T10:31:56Z day: '29' ddc: - '570' department: - _id: SaSi doi: 10.1038/s41467-019-09628-6 external_id: isi: - '000466118700002' file: - access_level: open_access checksum: 6550a328335396c856db4cbdda7d2994 content_type: application/pdf creator: dernst date_created: 2019-05-14T08:45:51Z date_updated: 2020-07-14T12:47:29Z file_id: '6448' file_name: 2019_NatureComm_Moussa.pdf file_size: 1223647 relation: main_file file_date_updated: 2020-07-14T12:47:29Z has_accepted_license: '1' intvolume: ' 10' isi: 1 issue: '1' language: - iso: eng month: '04' oa: 1 oa_version: Published Version publication: Nature Communications publication_identifier: eissn: - '20411723' publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: Canonical PRC1 controls sequence-independent propagation of Polycomb-mediated gene silencing tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 10 year: '2019' ...