Metnase mediates chromosome decatenation in acute leukemia cells.

Abstract:

:After DNA replication, sister chromatids must be untangled, or decatenated, before mitosis so that chromatids do not tear during anaphase. Topoisomerase IIalpha (Topo IIalpha) is the major decatenating enzyme. Topo IIalpha inhibitors prevent decatenation, causing cells to arrest during mitosis. Here we report that acute myeloid leukemia cells fail to arrest at the mitotic decatenation checkpoint, and their progression through this checkpoint is regulated by the DNA repair component Metnase (also termed SETMAR). Metnase contains a SET histone methylase and transposase nuclease domain, and is a component of the nonhomologous end-joining DNA double-strand break repair pathway. Metnase interacts with Topo IIalpha and enhances its decatenation activity. Here we show that multiple types of acute leukemia cells have an attenuated mitotic arrest when decatenation is inhibited and that in an acute myeloid leukemia (AML) cell line this is mediated by Metnase. Of further importance, Metnase permits continued proliferation of these AML cells even in the presence of the clinical Topo IIalpha inhibitor VP-16. In vitro, purified Metnase prevents VP-16 inhibition of Topo IIalpha decatenation of tangled DNA. Thus, Metnase expression levels may predict AML resistance to Topo IIalpha inhibitors, and Metnase is a potential therapeutic target for small molecule interference.

journal_name

Blood

journal_title

Blood

authors

Wray J,Williamson EA,Sheema S,Lee SH,Libby E,Willman CL,Nickoloff JA,Hromas R

doi

10.1182/blood-2008-08-175760

subject

Has Abstract

pub_date

2009-08-27 00:00:00

pages

1852-8

issue

9

eissn

0006-4971

issn

1528-0020

pii

blood-2008-08-175760

journal_volume

114

pub_type

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