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Friday, May.3, 2024
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| miRNA: |
hsa-miR-34b |
| Disease: |
colorectal cancer |
Relationship type: |
Causal |
Detection method for miRNA expression: |
Northern blot, qRT-PCR etc |
| Expression pattern of miRNA: |
down-regulated |
Validated targets of miRNA from the reference: |
unknown |
Validated targets of miRNA from TarBase: |
unknown : More... |
| Predicted targets: |
MIRANDA, TARGETSCAN, PICTAR-VERT |
Description: Down-regulation of miR-34b/c is associated with hypermethylation of the neighboring CpG island; and that DAC treatment rapidly restores miR-34b/c expression. Methylation of the miR-34b/c CpG island was frequently observed in CRC cell lines (nine of nine, 100%) and in primary CRC tumors (101 of 111, 90%), but not in normal colonic mucosa. Transfection of precursor miR-34b or miR-34c into CRC cells induced dramatic changes in the gene expression profile, and there was significant overlap between the genes down-regulated by miR-34b/c and those down-regulated by DAC. We also found that the miR-34b/c CpG island is a bidirectional promoter which drives expression of both miR-34b/c and B-cell translocation gene 4 (BTG4). Our results suggest that miR-34b/c and BTG4 are novel tumor suppressors in CRC and that the miR-34b/c CpG island, which bidirectionally regulates miR-34b/c and BTG4, is a frequent target of epigenetic silencing in CRC. |
Reference:
Epigenetic silencing of microRNA-34b/c and B-cell translocation gene 4 is associated with CpG island methylation in colorectal cancer. | PMID:18519671
Toyota M, Suzuki H, Sasaki Y, Maruyama R, Imai K, Shinomura Y, Tokino T.
Cancer Res. 2008 Jun 1;68(11):4123-32. |
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