A refined method to study gene dosage changes in-vitro using CRISPR/Cas9
Aims: Gene dosage can have a major impact on cell biology although, hitherto, is has been difficult to study using in-vitro models. We sought to refine and accelerate the development of “gene dosage” models through using CRISPR/Cas9 (a gene-editing technology) for sequential knockout of gene alleles...
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| Format: | Article |
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BMJ Publishing Group Ltd
2017
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| Online Access: | https://eprints.nottingham.ac.uk/44871/ |
| _version_ | 1848797017530171392 |
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| author | Raposo, T.P. Ebili, Henry Ilyas, Mohammad |
| author_facet | Raposo, T.P. Ebili, Henry Ilyas, Mohammad |
| author_sort | Raposo, T.P. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Aims: Gene dosage can have a major impact on cell biology although, hitherto, is has been difficult to study using in-vitro models. We sought to refine and accelerate the development of “gene dosage” models through using CRISPR/Cas9 (a gene-editing technology) for sequential knockout of gene alleles.
Methods: Our method involved (i) using Cas9 nuclease mRNA rather than expression plasmids, (ii) using a fluorescently labelled FAM-6 tracr complexed with guide RNA and (iii) using High Resolution Melting (HRM) analysis to screen for mutations. HCT116 cells, wild-type for TP53, were transfected with different molarities of FAM-6 tracr labelled and guide RNA targeting different exons of TP53 and selected by Fluorescence Associated Cell Sorting (FACS). Single-cell colonies were then isolated, expanded and tested for mutation in the targeted region by PCR/HRM.
Results: Out of 32 clones tested, 12 have shown aberrant melting by HRM, giving a targetting efficiency of 37.5%. One clone was sequenced and a heterozygous mutation found - in this case comprising a single base deletion in exon 3. mRNA sequencing confirmed the mutation was expressed and western blotting for p53 showed the presence of both wild type and truncated protein bands. Changes in expression of MDM-2 isoforms suggested a functional effect of the induced TP53 mutation.
Conclusions: We have developed an in-vitro model to study TP53 gene dosage effects. The protocol is efficient and applicable to any gene. Importantly, we have used Cas9 mRNA and labelled tracr/guideRNA to isolate likely-mutated cells and HRM for rapid mutation detection. |
| first_indexed | 2025-11-14T19:57:11Z |
| format | Article |
| id | nottingham-44871 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:57:11Z |
| publishDate | 2017 |
| publisher | BMJ Publishing Group Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-448712020-05-04T18:59:59Z https://eprints.nottingham.ac.uk/44871/ A refined method to study gene dosage changes in-vitro using CRISPR/Cas9 Raposo, T.P. Ebili, Henry Ilyas, Mohammad Aims: Gene dosage can have a major impact on cell biology although, hitherto, is has been difficult to study using in-vitro models. We sought to refine and accelerate the development of “gene dosage” models through using CRISPR/Cas9 (a gene-editing technology) for sequential knockout of gene alleles. Methods: Our method involved (i) using Cas9 nuclease mRNA rather than expression plasmids, (ii) using a fluorescently labelled FAM-6 tracr complexed with guide RNA and (iii) using High Resolution Melting (HRM) analysis to screen for mutations. HCT116 cells, wild-type for TP53, were transfected with different molarities of FAM-6 tracr labelled and guide RNA targeting different exons of TP53 and selected by Fluorescence Associated Cell Sorting (FACS). Single-cell colonies were then isolated, expanded and tested for mutation in the targeted region by PCR/HRM. Results: Out of 32 clones tested, 12 have shown aberrant melting by HRM, giving a targetting efficiency of 37.5%. One clone was sequenced and a heterozygous mutation found - in this case comprising a single base deletion in exon 3. mRNA sequencing confirmed the mutation was expressed and western blotting for p53 showed the presence of both wild type and truncated protein bands. Changes in expression of MDM-2 isoforms suggested a functional effect of the induced TP53 mutation. Conclusions: We have developed an in-vitro model to study TP53 gene dosage effects. The protocol is efficient and applicable to any gene. Importantly, we have used Cas9 mRNA and labelled tracr/guideRNA to isolate likely-mutated cells and HRM for rapid mutation detection. BMJ Publishing Group Ltd 2017-08-09 Article PeerReviewed Raposo, T.P., Ebili, Henry and Ilyas, Mohammad (2017) A refined method to study gene dosage changes in-vitro using CRISPR/Cas9. Journal of Clinical Pathology, 71 (3). pp. 207-214. ISSN 1472-4146 http://jcp.bmj.com/content/71/3/207 doi:10.1136/jclinpath-2017-204558 doi:10.1136/jclinpath-2017-204558 |
| spellingShingle | Raposo, T.P. Ebili, Henry Ilyas, Mohammad A refined method to study gene dosage changes in-vitro using CRISPR/Cas9 |
| title | A refined method to study gene dosage changes in-vitro using CRISPR/Cas9 |
| title_full | A refined method to study gene dosage changes in-vitro using CRISPR/Cas9 |
| title_fullStr | A refined method to study gene dosage changes in-vitro using CRISPR/Cas9 |
| title_full_unstemmed | A refined method to study gene dosage changes in-vitro using CRISPR/Cas9 |
| title_short | A refined method to study gene dosage changes in-vitro using CRISPR/Cas9 |
| title_sort | refined method to study gene dosage changes in-vitro using crispr/cas9 |
| url | https://eprints.nottingham.ac.uk/44871/ https://eprints.nottingham.ac.uk/44871/ https://eprints.nottingham.ac.uk/44871/ |