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MicroRNAs01:22

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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Updated: May 3, 2026

mirMachine: A One-Stop Shop for Plant miRNA Annotation
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miRClassify: an advanced web server for miRNA family classification and annotation.

Quan Zou1, Yaozong Mao1, Lingling Hu1

  • 1School of Information Science and Technology, Xiamen University, Xiamen, Fujian 361005, China.

Computers in Biology and Medicine
|February 1, 2014
PubMed
Summary

A new machine learning tool, miRClassify, identifies microRNA (miRNA) families from primary sequences, aiding in the discovery and functional annotation of novel miRNAs. This tool classifies miRNAs regardless of sequence or structural similarity, providing medical implications.

Keywords:
ClassificationMachine learningMicrorna family

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Area of Science:

  • Bioinformatics
  • Genomics
  • Computational Biology

Background:

  • MicroRNA (miRNA) families share common ancestry and often similar functions.
  • However, sequence and structural conservation within miRNA families is not guaranteed.
  • Accurate miRNA family identification is crucial for understanding their roles and annotating novel miRNAs.

Purpose of the Study:

  • To develop a novel machine learning-based web server, miRClassify.
  • To enable rapid identification and classification of miRNAs into their respective families based on primary sequence.
  • To provide available medical implications of miRNA families.

Main Methods:

  • Development of a machine learning model for miRNA classification.
  • Implementation of a web server (miRClassify) for user accessibility.
  • Integration with PubMed to retrieve medical implications.

Main Results:

  • miRClassify can accurately identify and classify miRNAs into families.
  • The tool functions effectively irrespective of sequence or structural similarity.
  • Medical implications associated with identified miRNA families are provided.

Conclusions:

  • miRClassify offers a robust method for miRNA family prediction using primary sequences.
  • The web server facilitates efficient identification and functional annotation of novel miRNAs.
  • This tool supports research into the medical relevance of miRNA families.