Pericentromeric satellite repeat expansions through RNA-derived DNA intermediates in cancer.

Abstract:

:Aberrant transcription of the pericentromeric human satellite II (HSATII) repeat is present in a wide variety of epithelial cancers. In deriving experimental systems to study its deregulation, we observed that HSATII expression is induced in colon cancer cells cultured as xenografts or under nonadherent conditions in vitro, but it is rapidly lost in standard 2D cultures. Unexpectedly, physiological induction of endogenous HSATII RNA, as well as introduction of synthetic HSATII transcripts, generated cDNA intermediates in the form of DNA/RNA hybrids. Single molecule sequencing of tumor xenografts showed that HSATII RNA-derived DNA (rdDNA) molecules are stably incorporated within pericentromeric loci. Suppression of RT activity using small molecule inhibitors reduced HSATII copy gain. Analysis of whole-genome sequencing data revealed that HSATII copy number gain is a common feature in primary human colon tumors and is associated with a lower overall survival. Together, our observations suggest that cancer-associated derepression of specific repetitive sequences can promote their RNA-driven genomic expansion, with potential implications on pericentromeric architecture.

authors

Bersani F,Lee E,Kharchenko PV,Xu AW,Liu M,Xega K,MacKenzie OC,Brannigan BW,Wittner BS,Jung H,Ramaswamy S,Park PJ,Maheswaran S,Ting DT,Haber DA

doi

10.1073/pnas.1518008112

subject

Has Abstract

pub_date

2015-12-08 00:00:00

pages

15148-53

issue

49

eissn

0027-8424

issn

1091-6490

pii

1518008112

journal_volume

112

pub_type

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