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1 Department of Gastroenterology and Hepatology, Flinders Centre for Digestive Health, Flinders Medical Centre, South Australia, Australia and
2 Department of Medicine, Flinders University of South Australia, Australia
Requests for reprints: Michael Z. Michael, Flinders Medical Centre, Gastroenterology and Hepatology (Room 3D230), Flinders Drive, Bedford Park, South Australia 5042, Australia. Phone: 61-8-8204-3940; Fax: 61-8-8204-3943. E-mail: michael.michael{at}flinders.edu.au
Short non-coding RNAs are known to regulate cellular processes including development, heterochromatin formation, and genomic stability in eukaryotes. Given the impact of these processes on cellular identity, a study was undertaken to investigate possible changes in microRNA (miRNA) levels during tumorigenesis. A total of 28 different miRNA sequences was identified in a colonic adenocarcinoma and normal mucosa, including 3 novel sequences and a further 7 that had previously been cloned only from mice. Human homologues of murine miRNA sequences, miR-143 and miR-145, consistently display reduced steady-state levels of the mature miRNA at the adenomatous and cancer stages of colorectal neoplasia.
Key Words: colorectal cancer gene expression microRNA epigenetics RNA interference
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