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4 results on '"Miriam Öttl"'

1. Tomosyns attenuate SNARE assembly and synaptic depression by binding to VAMP2-containing template complexes

Author

Marieke Meijer, Miriam Öttl, Jie Yang, Aygul Subkhangulova, Avinash Kumar, Zicheng Feng, Torben W. van Voorst, Alexander J. Groffen, Jan R. T. van Weering, Yongli Zhang, and Matthijs Verhage

Subjects
Science
Abstract

Abstract Tomosyns are widely thought to attenuate membrane fusion by competing with synaptobrevin-2/VAMP2 for SNARE-complex assembly. Here, we present evidence against this scenario. In a novel mouse model, tomosyn-1/2 deficiency lowered the fusion barrier and enhanced the probability that synaptic vesicles fuse, resulting in stronger synapses with faster depression and slower recovery. While wild-type tomosyn-1m rescued these phenotypes, substitution of its SNARE motif with that of synaptobrevin-2/VAMP2 did not. Single-molecule force measurements indeed revealed that tomosyn’s SNARE motif cannot substitute synaptobrevin-2/VAMP2 to form template complexes with Munc18-1 and syntaxin-1, an essential intermediate for SNARE assembly. Instead, tomosyns extensively bind synaptobrevin-2/VAMP2-containing template complexes and prevent SNAP-25 association. Structure-function analyses indicate that the C-terminal polybasic region contributes to tomosyn’s inhibitory function. These results reveal that tomosyns regulate synaptic transmission by cooperating with synaptobrevin-2/VAMP2 to prevent SNAP-25 binding during SNARE assembly, thereby limiting initial synaptic strength and equalizing it during repetitive stimulation.

Published
2024
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3. A reference human induced pluripotent stem cell line for large-scale collaborative studies

Author

Caroline B. Pantazis, Andrian Yang, Erika Lara, Justin A. McDonough, Cornelis Blauwendraat, Lirong Peng, Hideyuki Oguro, Jitendra Kanaujiya, Jizhong Zou, David Sebesta, Gretchen Pratt, Erin Cross, Jeffrey Blockwick, Philip Buxton, Lauren Kinner-Bibeau, Constance Medura, Christopher Tompkins, Stephen Hughes, Marianita Santiana, Faraz Faghri, Mike A. Nalls, Daniel Vitale, Shannon Ballard, Yue A. Qi, Daniel M. Ramos, Kailyn M. Anderson, Julia Stadler, Priyanka Narayan, Jason Papademetriou, Luke Reilly, Matthew P. Nelson, Sanya Aggarwal, Leah U. Rosen, Peter Kirwan, Venkat Pisupati, Steven L. Coon, Sonja W. Scholz, Theresa Priebe, Miriam Öttl, Jian Dong, Marieke Meijer, Lara J.M. Janssen, Vanessa S. Lourenco, Rik van der Kant, Dennis Crusius, Dominik Paquet, Ana-Caroline Raulin, Guojun Bu, Aaron Held, Brian J. Wainger, Rebecca M.C. Gabriele, Jackie M. Casey, Selina Wray, Dad Abu-Bonsrah, Clare L. Parish, Melinda S. Beccari, Don W. Cleveland, Emmy Li, Indigo V.L. Rose, Martin Kampmann, Carles Calatayud Aristoy, Patrik Verstreken, Laurin Heinrich, Max Y. Chen, Birgitt Schüle, Dan Dou, Erika L.F. Holzbaur, Maria Clara Zanellati, Richa Basundra, Mohanish Deshmukh, Sarah Cohen, Richa Khanna, Malavika Raman, Zachary S. Nevin, Madeline Matia, Jonas Van Lent, Vincent Timmerman, Bruce R. Conklin, Katherine Johnson Chase, Ke Zhang, Salome Funes, Daryl A. Bosco, Lena Erlebach, Marc Welzer, Deborah Kronenberg-Versteeg, Guochang Lyu, Ernest Arenas, Elena Coccia, Lily Sarrafha, Tim Ahfeldt, John C. Marioni, William C. Skarnes, Mark R. Cookson, Michael E. Ward, Florian T. Merkle, Human genetics, Amsterdam Neuroscience - Cellular & Molecular Mechanisms, Neurology, Merkle, Florian [0000-0002-8513-2998], Apollo - University of Cambridge Repository, Functional Genomics, and Amsterdam Neuroscience - Neurodegeneration

Subjects
Gene Editing, p53, iPSC, Induced Pluripotent Stem Cells, Cell Differentiation, Cell Biology, differentiation, single-cell, reference, whole-genome, karyotype, stem cell, pluripotent, ddc:570, CRISPR, Genetics, Molecular Medicine, Humans, Biological Assay, Human medicine, Biology
Abstract

Human induced pluripotent stem cell (iPSC) lines are a powerful tool for studying development and disease, but the considerable phenotypic variation between lines makes it challenging to replicate key findings and integrate data across research groups. To address this issue, we sub-cloned candidate human iPSC lines and deeply characterized their genetic properties using whole genome sequencing, their genomic stability upon CRISPR-Cas9-based gene editing, and their phenotypic properties including differentiation to commonly used cell types. These studies identified KOLF2.1J as an all-around well-performing iPSC line. We then shared KOLF2.1J with groups around the world who tested its performance in head-to-head comparisons with their own preferred iPSC lines across a diverse range of differentiation protocols and functional assays. On the strength of these findings, we have made KOLF2.1J and its gene-edited derivative clones readily accessible to promote the standardization required for large-scale collaborative science in the stem cell field.

Published
2022
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4. A reference induced pluripotent stem cell line for large-scale collaborative studies

Author

Caroline B. Pantazis, Andrian Yang, Erika Lara, Justin A. McDonough, Cornelis Blauwendraat, Lirong Peng, Hideyuki Oguro, Jitendra Kanaujiya, Jizhong Zou, David Sebesta, Gretchen Pratt, Erin Cross, Jeffrey Blockwick, Philip Buxton, Lauren Kinner-Bibeau, Constance Medura, Christopher Tompkins, Stephen Hughes, Marianita Santiana, Faraz Faghri, Mike A. Nalls, Daniel Vitale, Shannon Ballard, Yue A. Qi, Daniel M. Ramos, Kailyn M. Anderson, Julia Stadler, Priyanka Narayan, Jason Papademetriou, Luke Reilly, Matthew P. Nelson, Sanya Aggarwal, Leah U. Rosen, Peter Kirwan, Venkat Pisupati, Steven L. Coon, Sonja W. Scholz, Theresa Priebe, Miriam Öttl, Jian Dong, Marieke Meijer, Lara J.M. Janssen, Vanessa S. Lourenco, Rik van der Kant, Dennis Crusius, Dominik Paquet, Ana-Caroline Raulin, Guojun Bu, Aaron Held, Brian J. Wainger, Rebecca M.C. Gabriele, Jackie M Casey, Selina Wray, Dad Abu-Bonsrah, Clare L. Parish, Melinda S. Beccari, Don W. Cleveland, Emmy Li, Indigo V.L. Rose, Martin Kampmann, Carles Calatayud Aristoy, Patrik Verstreken, Laurin Heinrich, Max Y. Chen, Birgitt Schüle, Dan Dou, Erika L.F. Holzbaur, Maria Clara Zanellati, Richa Basundra, Mohanish Deshmukh, Sarah Cohen, Richa Khanna, Malavika Raman, Zachary S. Nevin, Madeline Matia, Jonas Van Lent, Vincent Timmerman, Bruce R. Conklin, Katherine Johnson Chase, Ke Zhang, Salome Funes, Daryl A. Bosco, Lena Erlebach, Marc Welzer, Deborah Kronenberg-Versteeg, Guochang Lyu, Ernest Arenas, Elena Coccia, Lily Sarrafha, Tim Ahfeldt, John C. Marioni, William C. Skarnes, Mark R. Cookson, Michael E. Ward, and Florian T. Merkle

Abstract

Human induced pluripotent stem cell (iPSC) lines are a powerful tool for studying development and disease, but the considerable phenotypic variation between lines makes it challenging to replicate key findings and integrate data across research groups. To address this issue, we sub-cloned candidate iPSC lines and deeply characterised their genetic properties using whole genome sequencing, their genomic stability upon CRISPR/Cas9-based gene editing, and their phenotypic properties including differentiation to commonly-used cell types. These studies identified KOLF2.1J as an all-around well-performing iPSC line. We then shared KOLF2.1J with groups around the world who tested its performance in head-to-head comparisons with their own preferred iPSC lines across a diverse range of differentiation protocols and functional assays. On the strength of these findings, we have made KOLF2.1J and hundreds of its gene-edited derivative clones readily accessible to promote the standardization required for large-scale collaborative science in the stem cell field.SummaryThe authors of this collaborative study deeply characterized human induced pluripotent stem cell (iPSC) lines to rationally select a clonally-derived cell line that performs well across multiple modalities. KOLF2.1J was identified as a candidate reference cell line based on single-cell analysis of its gene expression in the pluripotent state, whole genome sequencing, genomic stability after highly efficient CRISPR-mediated gene editing, integrity of the p53 pathway, and the efficiency with which it differentiated into multiple target cell populations. Since it is deeply characterized and can be readily acquired, KOLF2.1J is an attractive reference cell line for groups working with iPSCs.Graphical abstract

Published
2021
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