Partial FMRP expression is sufficient to normalize neuronal hyperactivity in Fragile X neurons
© 2019 The Authors. European Journal of Neuroscience published by Federation of European Neuroscience Societies and John Wiley & Sons Ltd. Fragile X syndrome (FXS) is the most common genetic form of intellectual disability caused by a CGG repeat expansion in the 5′-UTR of the Fragile X mental...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021
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| Online Access: | https://hdl.handle.net/1721.1/136619 |
| _version_ | 1826203798087925760 |
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| author | Graef, John D Wu, Hao Ng, Carrie Sun, Chicheng Villegas, Vivian Qadir, Deena Jesseman, Kimberly Warren, Stephen T Jaenisch, Rudolf Cacace, Angela Wallace, Owen |
| author2 | Massachusetts Institute of Technology. Department of Biology |
| author_facet | Massachusetts Institute of Technology. Department of Biology Graef, John D Wu, Hao Ng, Carrie Sun, Chicheng Villegas, Vivian Qadir, Deena Jesseman, Kimberly Warren, Stephen T Jaenisch, Rudolf Cacace, Angela Wallace, Owen |
| author_sort | Graef, John D |
| collection | MIT |
| description | © 2019 The Authors. European Journal of Neuroscience published by Federation of European Neuroscience Societies and John Wiley & Sons Ltd. Fragile X syndrome (FXS) is the most common genetic form of intellectual disability caused by a CGG repeat expansion in the 5′-UTR of the Fragile X mental retardation gene FMR1, triggering epigenetic silencing and the subsequent absence of the protein, FMRP. Reactivation of FMR1 represents an attractive therapeutic strategy targeting the genetic root cause of FXS. However, largely missing in the FXS field is an understanding of how much FMR1 reactivation is required to rescue FMRP-dependent mutant phenotypes. Here, we utilize FXS patient-derived excitatory neurons to model FXS in vitro and confirm that the absence of FMRP leads to neuronal hyperactivity. We further determined the levels of FMRP and the percentage of FMRP-positive cells necessary to correct this phenotype utilizing a mixed and mosaic neuronal culture system and a combination of CRISPR, antisense and expression technologies to titrate FMRP in FXS and WT neurons. Our data demonstrate that restoration of greater than 5% of overall FMRP expression levels or greater than 20% FMRP-expressing neurons in a mosaic pattern is sufficient to normalize a FMRP-dependent, hyperactive phenotype in FXS iPSC-derived neurons. |
| first_indexed | 2024-09-23T12:43:36Z |
| format | Article |
| id | mit-1721.1/136619 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T12:43:36Z |
| publishDate | 2021 |
| publisher | Wiley |
| record_format | dspace |
| spelling | mit-1721.1/1366192023-09-07T21:20:39Z Partial FMRP expression is sufficient to normalize neuronal hyperactivity in Fragile X neurons Graef, John D Wu, Hao Ng, Carrie Sun, Chicheng Villegas, Vivian Qadir, Deena Jesseman, Kimberly Warren, Stephen T Jaenisch, Rudolf Cacace, Angela Wallace, Owen Massachusetts Institute of Technology. Department of Biology Whitehead Institute for Biomedical Research © 2019 The Authors. European Journal of Neuroscience published by Federation of European Neuroscience Societies and John Wiley & Sons Ltd. Fragile X syndrome (FXS) is the most common genetic form of intellectual disability caused by a CGG repeat expansion in the 5′-UTR of the Fragile X mental retardation gene FMR1, triggering epigenetic silencing and the subsequent absence of the protein, FMRP. Reactivation of FMR1 represents an attractive therapeutic strategy targeting the genetic root cause of FXS. However, largely missing in the FXS field is an understanding of how much FMR1 reactivation is required to rescue FMRP-dependent mutant phenotypes. Here, we utilize FXS patient-derived excitatory neurons to model FXS in vitro and confirm that the absence of FMRP leads to neuronal hyperactivity. We further determined the levels of FMRP and the percentage of FMRP-positive cells necessary to correct this phenotype utilizing a mixed and mosaic neuronal culture system and a combination of CRISPR, antisense and expression technologies to titrate FMRP in FXS and WT neurons. Our data demonstrate that restoration of greater than 5% of overall FMRP expression levels or greater than 20% FMRP-expressing neurons in a mosaic pattern is sufficient to normalize a FMRP-dependent, hyperactive phenotype in FXS iPSC-derived neurons. 2021-10-27T20:36:16Z 2021-10-27T20:36:16Z 2020 2021-07-19T17:38:56Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/136619 en 10.1111/EJN.14660 European Journal of Neuroscience Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Wiley Wiley |
| spellingShingle | Graef, John D Wu, Hao Ng, Carrie Sun, Chicheng Villegas, Vivian Qadir, Deena Jesseman, Kimberly Warren, Stephen T Jaenisch, Rudolf Cacace, Angela Wallace, Owen Partial FMRP expression is sufficient to normalize neuronal hyperactivity in Fragile X neurons |
| title | Partial FMRP expression is sufficient to normalize neuronal hyperactivity in Fragile X neurons |
| title_full | Partial FMRP expression is sufficient to normalize neuronal hyperactivity in Fragile X neurons |
| title_fullStr | Partial FMRP expression is sufficient to normalize neuronal hyperactivity in Fragile X neurons |
| title_full_unstemmed | Partial FMRP expression is sufficient to normalize neuronal hyperactivity in Fragile X neurons |
| title_short | Partial FMRP expression is sufficient to normalize neuronal hyperactivity in Fragile X neurons |
| title_sort | partial fmrp expression is sufficient to normalize neuronal hyperactivity in fragile x neurons |
| url | https://hdl.handle.net/1721.1/136619 |
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