Hypo-methylation mediates chromosomal instability in pancreatic NET.

Marinoni, Ilaria; Wiederkehr, Astrid; Wiedmer, Tabea; Pantasis, Sophia; Di Domenico, Annunziata; Rasmus Möller, Frank; Vassella, Erik; Schmitt Kurrer, Anja; Perren, Aurel (2017). Hypo-methylation mediates chromosomal instability in pancreatic NET. Endocrine-related cancer, 24(3), pp. 137-146. BioScientifica Ltd. 10.1530/ERC-16-0554

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DAXX and or ATRX loss occur in 40% of pancreatic neuro-endocrine tumors (PanNETs). PanNETs negative for DAXX or ATRX show an increased risk of relapse. The tumor-associated pathways activated upon DAXX or ATRX loss and how this event may induce chromosomal instability (CIN) and alternative lengthening telomeres (ALT) are still unknown. Both DAXX and ATRX are involved in DNA methylation regulation. DNA methylation of heterochromatin and of non-coding sequences is extremely important for the maintenance of genomic stability. We analysed the association of DAXX and or ATRX loss and CIN with global DNA methylation in human PanNET samples and the effect of DAXX knock down on methylation and cell proliferation. We assessed LINE1 as well as global DNA methylation in 167 PanNETs and we found that DAXX and or ATRX negative tumors and tumors with CIN were hypo-methylated. DAXX knock-down in PanNET cell lines blocked cells in G1/G0 phase and seemed to increase CIN in QGP-1 cells. However, no direct changes in DNA methylation were observed after DAXX knock down in vitro. In conclusion our data indicate that epigenetic changes are crucial steps in the progression of PanNETs loss and suggest that DNA methylation is the mechanism via which CIN is induced, allowing clonal expansion and selection.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute of Pathology

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Marinoni, Ilaria; Wiedmer, Tabea; Pantasis, Sophia; Di Domenico, Annunziata; Rasmus Möller, Frank; Vassella, Erik; Schmitt Kurrer, Anja and Perren, Aurel

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

1351-0088

Publisher:

BioScientifica Ltd.

Language:

English

Submitter:

Aurel Perren

Date Deposited:

06 Feb 2017 15:16

Last Modified:

24 Jan 2018 02:30

Publisher DOI:

10.1530/ERC-16-0554

PubMed ID:

28115389

BORIS DOI:

10.7892/boris.94841

URI:

https://boris.unibe.ch/id/eprint/94841

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