miR-224
| miR-224 | |
|---|---|
 Conserved secondary structure of miR-224 microRNA precursor | |
| Identifiers | |
| Symbol | miR-224 |
| Alt. Symbols | MIR224 |
| Rfam | RF00680 |
| miRBase | MI0000301 |
| miRBase family | MIPF0000088 |
| NCBI Gene | 407009 |
| HGNC | 31604 |
| OMIM | 300769 |
| RefSeq | NR_029638 |
| Other data | |
| RNA type | miRNA |
| Domain | Mammalia |
| GO | 0035195 |
| SO | 0001244 |
| Locus | Chr. X q28 |
| PDB structures | PDBe |
miR-224 is a family of microRNA precursors found in mammals, including humans. The ~22 nucleotide mature miRNA sequence is excised from the precursor hairpin by the enzyme Dicer.[1]
Function
[edit | edit source]miR-224, being located on the X-chromosome, is thought to be active in mammalian ovaries, and possibly responds to TGF beta 1.[2] A target of miR-224 has been predicted to be SMAD4. Experimental evidence has shown that while the SMAD4 mRNA level is unchanged, increased miR-224 expression decreases concentration of SMDA4 protein in murine granulosa cells.[3] This is consistent with post-transcriptional miRNA regulation.[2]
Role in cancer
[edit | edit source]miR-224 has been noted as the most upregulated microRNA in hepatocellular carcinoma.[4] The same study identified a target of mir-224 as apoptosis-inhibitor 5 (API-5).[4]
miR-224 has also been linked with pancreatic ductal carcinoma, where it is thought to repress CD40 expression in cancer cells.[5]
References
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