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dc.contributor.authorHowarth, Karen D.
dc.contributor.authorMirza, Tashfina
dc.contributor.authorCooke, Susanna L.
dc.contributor.authorChin, Suet-Feung
dc.contributor.authorPole, Jessica C.
dc.contributor.authorTurro, Ernest
dc.contributor.authorEldridge, Matthew D.
dc.contributor.authorGarcia, Raquel Manzano
dc.contributor.authorRueda, Oscar M.
dc.contributor.authorBoursnell, Chris
dc.contributor.authorAbraham, Jean E.
dc.contributor.authorCaldas, Carlos
dc.contributor.authorEdwards, Paul A. W.
dc.date.accessioned2021-01-07T16:23:16Z
dc.date.available2021-01-07T16:23:16Z
dc.date.issued2021-01-07
dc.date.submitted2020-09-13
dc.identifier.others13058-020-01377-5
dc.identifier.other1377
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/315833
dc.descriptionFunder: Cancer Research UK
dc.descriptionFunder: Breast Cancer Now
dc.descriptionFunder: Addenbrookes Charitable Trust
dc.descriptionFunder: Mark Foundation For Cancer Research; doi: http://dx.doi.org/10.13039/100014599
dc.descriptionFunder: Addenbrooke's Charitable Trust, Cambridge University Hospitals (GB)
dc.description.abstractAbstract: Background: NRG1 gene fusions may be clinically actionable, since cancers carrying the fusion transcripts can be sensitive to tyrosine kinase inhibitors. The NRG1 gene encodes ligands for the HER2(ERBB2)-ERBB3 heterodimeric receptor tyrosine kinase, and the gene fusions are thought to lead to autocrine stimulation of the receptor. The NRG1 fusion expressed in the breast cancer cell line MDA-MB-175 serves as a model example of such fusions, showing the proposed autocrine loop and exceptional drug sensitivity. However, its structure has not been properly characterised, its oncogenic activity has not been fully explained, and there is limited data on such fusions in breast cancer. Methods: We analysed genomic rearrangements and transcripts of NRG1 in MDA-MB-175 and a panel of 571 breast cancers. Results: We found that the MDA-MB-175 fusion—originally reported as a DOC4(TENM4)-NRG1 fusion, lacking the cytoplasmic tail of NRG1—is in reality a double fusion, PPP6R3-TENM4-NRG1, producing multiple transcripts, some of which include the cytoplasmic tail. We hypothesise that many NRG1 fusions may be oncogenic not for lacking the cytoplasmic domain but because they do not encode NRG1’s nuclear-localised form. The fusion in MDA-MB-175 is the result of a very complex genomic rearrangement, which we partially characterised, that creates additional expressed gene fusions, RSF1-TENM4, TPCN2-RSF1, and MRPL48-GAB2. We searched for NRG1 rearrangements in 571 breast cancers subjected to genome sequencing and transcriptome sequencing and found four cases (0.7%) with fusions, WRN-NRG1, FAM91A1-NRG1, ARHGEF39-NRG1, and ZNF704-NRG1, all splicing into NRG1 at the same exon as in MDA-MB-175. However, the WRN-NRG1 and ARHGEF39-NRG1 fusions were out of frame. We identified rearrangements of NRG1 in many more (8% of) cases that seemed more likely to inactivate than to create activating fusions, or whose outcome could not be predicted because they were complex, or both. This is not surprising because NRG1 can be pro-apoptotic and is inactivated in some breast cancers. Conclusions: Our results highlight the complexity of rearrangements of NRG1 in breast cancers and confirm that some do not activate but inactivate. Careful interpretation of NRG1 rearrangements will therefore be necessary for appropriate patient management.
dc.languageen
dc.publisherBioMed Central
dc.subjectResearch Article
dc.subjectNRG1 fusions
dc.subjectBreast cancer
dc.subjectNRG1
dc.subjectClinically actionable
dc.subjectMDA-MB-175
dc.subjectWhole-genome sequencing
dc.subjectTranscriptome sequencing
dc.titleNRG1 fusions in breast cancer
dc.typeArticle
dc.date.updated2021-01-07T16:23:15Z
prism.issueIdentifier1
prism.publicationNameBreast Cancer Research
prism.volume23
dc.identifier.doi10.17863/CAM.62944
dcterms.dateAccepted2020-11-30
rioxxterms.versionofrecord10.1186/s13058-020-01377-5
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidHowarth, Karen D. [0000-0002-1124-4583]
dc.contributor.orcidMirza, Tashfina [0000-0002-5780-9789]
dc.contributor.orcidCooke, Susanna L. [0000-0002-0955-0346]
dc.contributor.orcidChin, Suet-Feung [0000-0001-5697-1082]
dc.contributor.orcidPole, Jessica C. [0000-0002-5651-302X]
dc.contributor.orcidTurro, Ernest [0000-0002-1820-6563]
dc.contributor.orcidEldridge, Matthew D. [0000-0002-5799-8911]
dc.contributor.orcidGarcia, Raquel Manzano [0000-0002-5124-8992]
dc.contributor.orcidRueda, Oscar M. [0000-0003-0008-4884]
dc.contributor.orcidBoursnell, Chris [0000-0002-3494-4451]
dc.contributor.orcidAbraham, Jean E. [0000-0003-0688-4807]
dc.contributor.orcidCaldas, Carlos [0000-0003-3547-1489]
dc.contributor.orcidEdwards, Paul A. W. [0000-0002-4789-3374]
dc.identifier.eissn1465-542X


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