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Pre-miRNA instead of Pri-miRNA in the first point of mechanism. Diagram of microRNA (miRNA) action with mRNA Examples of miRNA hairpins , with the mature miRNAs shown in red. Micro ribonucleic acid (microRNA, miRNA, μRNA) are small, single-stranded, non-coding RNA molecules containing 21–23 nucleotides. [1]
miR-30 microRNA precursor is a small non-coding RNA that regulates gene expression.Animal microRNAs are transcribed as pri-miRNA (primary miRNA) of varying length which in turns are processed in the nucleus by Drosha into ~70 nucleotide stem-loop precursor called pre-miRNA (precursor miRNA) and subsequently processed by the Dicer enzyme to give a mature ~22 nucleotide product.
Mir-1 plays an important role in some cancers. Rhabdomyosarcoma is the most common soft tissue sarcoma in children. Since the tumor results from undifferentiated cells, agents that promote differentiation hold promise as possible therapies.
Many mammalian genomes encode four closely related miR-29 precursors that are transcribed in two transcriptional units. For example, human miR-29a and miR-29b-1 are processed from an intron of a long non-coding transcript pri-miRNA (lnc-pri-miRNA) LOC646329 from chromosome 7. miR-29b-2 (identical in sequence to miR-29b-1) and miR-29c are co-transcribed from chromosome 1.
Oncomir-1 has 2 paralogs, miR-106a-363 and mir-106b-25. These are located on different chromosomes and contain individual miRNAs that are highly similar to those encoded by the mir-17-92 cluster. [7] Mir-92-1 for example, appears on the mir-17-92 cluster and mir-92-2 appears on the mir-106a-363 cluster.
Function Distribution Ref. Small nuclear RNA: snRNA: Splicing and other functions: Eukaryotes and archaea [3] Small nucleolar RNA: snoRNA: Nucleotide modification of RNAs: Eukaryotes and archaea [4] SmY RNA: SmY: mRNA trans-splicing: Nematodes [5] Small Cajal body-specific RNA: scaRNA: Type of snoRNA; Nucleotide modification of RNAs: Guide RNA ...
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