MACROD2 haploinsufficiency impairs catalytic activity of PARP1 and promotes chromosome instability and growth of intestinal tumors

Anuratha Sakthianandeswaren, Marie J. Parsons, Dmitri Mouradov, Ruth N. Mackinnon, Bruno Catimel, Sheng Liu, Michelle Palmieri, Christopher Love, Robert N. Jorissen, Shan Li, Lachlan Whitehead, Tracy L. Putoczki, Adele Preaudet, Cary Tsui, Cameron J. Nowell, Robyn L. Ward, Nicholas J. Hawkins, Jayesh Desai, Peter Gibbs, Matthias ErnstIan Street, Michael Buchert, Oliver M. Sieber

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


ADP-ribosylation is an important posttranslational protein modification that regulates diverse biological processes, controlled by dedicated transferases and hydro-lases. Here, we show that frequent deletions (∼30%) of the MACROD2 mono-ADP-ribosylhydrolase locus in human colorectal cancer cause impaired PARP1 transferase activity in a gene dosage–dependent manner. MACROD2 haploinsufficiency alters DNA repair and sensitivity to DNA damage and results in chromosome instability. Heterozygous and homozygous depletion of Macrod2 enhances intestinal tumorigenesis in ApcMin/+ mice and the growth of human colorectal cancer xenografts. MACROD2 deletion in sporadic colorectal cancer is associated with the extent of chromosome instability, independent of clinical parameters and other known genetic drivers. We conclude that MACROD2 acts as a haploinsufficient tumor suppressor, with loss of function promoting chromosome instability, thereby driving cancer evolution. SIGNIFICANCE: Chromosome instability (CIN) is a hallmark of cancer. We identify MACROD2 deletion as a cause of CIN in human colorectal cancer. MACROD2 loss causes repression of PARP1 activity, impairing DNA repair. MACROD2 haploinsufficiency promotes CIN and intestinal tumor growth. Our results reveal MACROD2 as a major caretaker tumor suppressor gene.

Original languageEnglish
Pages (from-to)988-1005
Number of pages18
JournalCancer Discovery
Issue number8
Publication statusPublished or Issued - Aug 2018
Externally publishedYes

ASJC Scopus subject areas

  • Oncology

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