Analysis of HER2 genomic binding in breast cancer cells identifies a global role in direct gene regulation

English version

Autoři: Aisling M. Redmond ^aff001; Soleilmane Omarjee ^aff001; Igor Chernukhin ^aff001; Muriel Le Romancer ^aff002; Jason S. Carroll ^aff001
Působiště autorů: University of Cambridge, Cancer Research UK Cambridge Institute, Cambridge, United Kingdom ^aff001; Université Lyon 1, Lyon, France ^aff002; Inserm U1052, Centre de Recherche en Cancérologie de Lyon, Lyon, France ^aff003; CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, Lyon, France ^aff004
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0225180

Souhrn

HER2 is a transmembrane receptor tyrosine kinase, which plays a key role in breast cancer due to a common genomic amplification. It is used as a marker to stratify patients in the clinic and is targeted by a number of drugs including Trastuzumab and Lapatinib. HER2 has previously been shown to translocate to the nucleus. In this study, we have explored the properties of nuclear HER2 by analysing the binding of this protein to the chromatin in two breast cancer cell lines. We find genome-wide re-programming of HER2 binding after treatment with the growth factor EGF and have identified a de novo motif at HER2 binding sites. Over 2,000 HER2 binding sites are found in both breast cancer cell lines after EGF treatment, and according to pathway analysis, these binding sites were enriched near genes involved in protein kinase activity and signal transduction. HER2 was shown to co-localise at a small subset of regions demarcated by H3K4me1, a hallmark of functional enhancer elements and HER2/H3K4me1 co-bound regions were enriched near EGF regulated genes providing evidence for their functional role as regulatory elements. A chromatin bound role for HER2 was verified by independent methods, including Proximity Ligation Assay (PLA), which confirmed a close association between HER2 and H3K4me1. Mass spectrometry analysis of the chromatin bound HER2 complex identified EGFR and STAT3 as interacting partners in the nucleus. These findings reveal a global role for HER2 as a chromatin-associated factor that binds to enhancer elements to elicit direct gene expression events in breast cancer cells.

Klíčová slova:

Binding analysis – Breast cancer – Cell binding – Gene expression – Gene regulation – Chromatin – Sequence motif analysis – BT474 cells

Zdroje

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Analysis of HER2 genomic binding in breast cancer cells identifies a global role in direct gene regulation

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