Functional ex vivoDNA fibre assay to measure replication dynamics in breast cancer tissue
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2024
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| author | Mengting Chen Nathalie van den Tempel Arkajyoti Bhattacharya Shibo Yu Bea Rutgers Rudolf SN Fehrmann Sander de Haas Bert van der Vegt Marcel ATM van Vugt |
| author_facet | Mengting Chen Nathalie van den Tempel Arkajyoti Bhattacharya Shibo Yu Bea Rutgers Rudolf SN Fehrmann Sander de Haas Bert van der Vegt Marcel ATM van Vugt Mengting Chen Nathalie van den Tempel Arkajyoti Bhattacharya Shibo Yu Bea Rutgers Rudolf SN Fehrmann Sander de Haas Bert van der Vegt Marcel ATM van Vugt |
| collection | Wiley Open Access |
| contents | Functional ex vivoDNA fibre assay to measure replication dynamics in breast cancer tissue Mengting Chen Nathalie van den Tempel Arkajyoti Bhattacharya Shibo Yu Bea Rutgers Rudolf SN Fehrmann Sander de Haas Bert van der Vegt Marcel ATM van Vugt The Journal of Pathology AbstractReplication stress (RS) is a key trait of cancer cells, and a potential actionable target in cancer treatment. Accurate methods to measure RS in tumour samples are currently lacking. DNA fibre analysis has been used as a common technique to measure RS in cell lines. Here, we investigated DNA fibre analysis on fresh breast cancer specimens and correlated DNA replication kinetics to known RS markers and genomic alterations. Fresh, treatment‐naïve primary breast cancer samples (n = 74) were subjected to ex vivo DNA fibre analysis to measure DNA replication kinetics. Tumour cell proliferation was confirmed by EdU incorporation and cytokeratin AE1/AE3 (CK) staining. The RS markers phospho‐S33‐RPA and γH2AX and the RS‐inducing proto‐oncogenes Cyclin E1 and c‐Myc were analysed by immunohistochemistry. Copy number variations (CNVs) were assessed from genome‐wide single nucleotide polymorphism (SNP) arrays. We found that the majority of proliferating (EdU‐positive) cells in each sample were CK‐positive and therefore considered to be tumour cells. DNA fibre lengths varied largely in most tumour samples. The median DNA fibre length showed a significant inverse correlation with pRPA expression (r = −0.29, p = 0.033) but was not correlated with Cyclin E1 or c‐Myc expression and global CNVs in this study. Nuclear Cyclin E1 expression showed a positive correlation with pRPA levels (r = 0.481, p < 0.0001), while cytoplasmic Cyclin E1 expression exhibited an inverse association with pRPA expression (r = −0.353, p = 0.002) and a positive association with global CNVs (r = 0.318, p = 0.016). In conclusion, DNA fibre analysis performed with fresh primary breast cancer samples is feasible. Fibre lengths were associated with pRPA expression. Cyclin E1 expression was associated with pRPA and the percentage of CNVs. © 2024 The Author(s). The Journal of Pathology published by John Wiley & Sons Ltd on behalf of The Pathological Society of Great Britain and Ireland. 10.1002/path.6328 http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| doi_str_mv | 10.1002/path.6328 |
| format | Artículo Open Access |
| id | wiley_oa_10_1002_path_6328 |
| institution | Wiley Open Access |
| license_str_mv | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| publishDate | 2024 |
| publisher | Wiley |
| record_format | wiley_oa |
| spellingShingle | Functional ex vivoDNA fibre assay to measure replication dynamics in breast cancer tissue Mengting Chen Nathalie van den Tempel Arkajyoti Bhattacharya Shibo Yu Bea Rutgers Rudolf SN Fehrmann Sander de Haas Bert van der Vegt Marcel ATM van Vugt The Journal of Pathology Functional ex vivoDNA fibre assay to measure replication dynamics in breast cancer tissue Mengting Chen Nathalie van den Tempel Arkajyoti Bhattacharya Shibo Yu Bea Rutgers Rudolf SN Fehrmann Sander de Haas Bert van der Vegt Marcel ATM van Vugt The Journal of Pathology AbstractReplication stress (RS) is a key trait of cancer cells, and a potential actionable target in cancer treatment. Accurate methods to measure RS in tumour samples are currently lacking. DNA fibre analysis has been used as a common technique to measure RS in cell lines. Here, we investigated DNA fibre analysis on fresh breast cancer specimens and correlated DNA replication kinetics to known RS markers and genomic alterations. Fresh, treatment‐naïve primary breast cancer samples (n = 74) were subjected to ex vivo DNA fibre analysis to measure DNA replication kinetics. Tumour cell proliferation was confirmed by EdU incorporation and cytokeratin AE1/AE3 (CK) staining. The RS markers phospho‐S33‐RPA and γH2AX and the RS‐inducing proto‐oncogenes Cyclin E1 and c‐Myc were analysed by immunohistochemistry. Copy number variations (CNVs) were assessed from genome‐wide single nucleotide polymorphism (SNP) arrays. We found that the majority of proliferating (EdU‐positive) cells in each sample were CK‐positive and therefore considered to be tumour cells. DNA fibre lengths varied largely in most tumour samples. The median DNA fibre length showed a significant inverse correlation with pRPA expression (r = −0.29, p = 0.033) but was not correlated with Cyclin E1 or c‐Myc expression and global CNVs in this study. Nuclear Cyclin E1 expression showed a positive correlation with pRPA levels (r = 0.481, p < 0.0001), while cytoplasmic Cyclin E1 expression exhibited an inverse association with pRPA expression (r = −0.353, p = 0.002) and a positive association with global CNVs (r = 0.318, p = 0.016). In conclusion, DNA fibre analysis performed with fresh primary breast cancer samples is feasible. Fibre lengths were associated with pRPA expression. Cyclin E1 expression was associated with pRPA and the percentage of CNVs. © 2024 The Author(s). The Journal of Pathology published by John Wiley & Sons Ltd on behalf of The Pathological Society of Great Britain and Ireland. 10.1002/path.6328 http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| title | Functional ex vivoDNA fibre assay to measure replication dynamics in breast cancer tissue |
| topic | The Journal of Pathology |
| url | https://pathsocjournals.onlinelibrary.wiley.com/doi/10.1002/path.6328 |