Abstract：
:Adenomatous polyposis coli (APC) gene mutations have been implicated in familial and sporadic gastrointestinal (GI) cancers. APC mutations are associated with autosomal dominant inheritance of disease in humans. Similarly, mice that contain a single mutant APC gene encoding a protein truncated at residue 716 (Apc(Δ716)) develop multiple polyps throughout the GI tract as early as 4 weeks after birth. Inactivation of another tumor suppressor gene, Hypermethylated in Cancer 1 (HIC1), often occurs in human colon cancers, among others, via CpG island hypermethylation. Homozygous deletion of Hic1 in mice results in major developmental defects and embryonic lethality. Hic1 heterozygotes have previously been shown to develop tumors of a variety of tissue types. We now report that loss of a single Hic1 allele can promote crypt hyperplasia and neoplasia of the GI tract, and Hic1(+/-), Apc(+/Δ716) double heterozygotes (DH) develop increased numbers of polyps throughout the GI tract at 60 days. Hic1 expression is absent in polyps from DH mice, with concomitant increased expression of two transcriptional repression targets of Hic1, Sirt1 and Sox9. Together, our data suggest that loss of a gene frequently silenced via epigenetic mechanisms, Hic1, can cooperate with loss of a gene mutated in GI cancer, Apc, to promote tumorigenesis in an in vivo model of multiple intestinal neoplasia.
journal_name
Oncogenejournal_title
Oncogeneauthors
Mohammad HP,Zhang W,Prevas HS,Leadem BR,Zhang M,Herman JG,Hooker CM,Watkins DN,Karim B,Huso DL,Baylin SBdoi
10.1038/onc.2010.633subject
Has Abstractpub_date
2011-06-09 00:00:00pages
2659-69issue
23eissn
0950-9232issn
1476-5594pii
onc2010633journal_volume
30pub_type
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