| microRNA 20a | OKDB#: 4498 |
| Symbols: | MIR20A | Species: | human | ||
| Synonyms: | MIR20, MIRN20, miR-20, MIRN20A, miRNA20A, hsa-mir-20, hsa-mir-20a, | Locus: | 13q31.3 in Homo sapiens |
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| General Comment | NCBI Summary: microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq] | ||||
| General function | RNA processing | ||||
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| Cellular localization | Cytoplasmic | ||||
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| Ovarian function | |||||
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| Ovarian localization | Oocyte | ||||
| Comment | Differentially expressed micoRNAs in human oocytes. Xu YW et al. PURPOSE: To identify differentially expressed microRNAs (miRNAs) and expression patterns of specific miRNAs during meiosis in human oocytes. MATERIALS AND METHODS: To identify differentially expressed miRNAs, GV oocytes and MII oocytes matured at conventional FSH levels (5.5ng/ml) were analyzed by miRNA microarray. Real-time RT-PCR was used to confirm the changed miRNAs. To validate the dynamic changes of miRNAs from GV to MII stages, oocytes were divided into four groups (#1-4), corresponding to GV oocytes, MI oocytes, MII oocytes matured in conventional FSH level and MII oocytes matured in high FSH level (2,000ng/ml) respectively. RESULTS: Compared with GV oocytes, MII oocytes exhibited up-regulation of 4 miRNAs (hsa-miR-193a-5p, hsa-miR-297, hsa-miR-625 and hsa-miR-602), and down-regulation of 11 miRNAs (hsa-miR-888*, hsa-miR-212, hsa-miR-662, hsa-miR-299-5p, hsa-miR-339-5p, hsa-miR-20a, hsa-miR-486-5p, hsa-miR-141*, hsa-miR-768-5p, hsa-miR-376a and hsa-miR-15a). RT-PCR analysis of hsa-miR-15a and hsa-miR-20a expression revealed concordant dynamic changes in oocytes from group 1 to group 4. CONCLUSION(S): Specific miRNAs in human oocytes had dynamic changes during meiosis. High-concentration FSH in IVM medium led to reverse effect on the expression of hsa-miR-15a and hsa-miR-20a. | ||||
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| Mutations | 0 mutations | ||||
| Genomic Region | show genomic region | ||||
| Phenotypes and GWAS | show phenotypes and GWAS | ||||
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| created: | June 15, 2011, 12:33 p.m. | by: |
hsueh email:
home page: |
| last update: | June 15, 2011, 12:33 p.m. | by: | hsueh email: |
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