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piRNA - Piwi-interacting RNAs02:57

piRNA - Piwi-interacting RNAs

PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...

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PsRobot: a web-based plant small RNA meta-analysis toolbox.

Hua-Jun Wu1, Ying-Ke Ma, Tong Chen

  • 1The State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.

Nucleic Acids Research
|June 14, 2012
PubMed
Summary

PsRobot is a web tool for analyzing plant small RNAs (smRNAs), identifying microRNAs and predicting their targets. It aids in understanding smRNA gene regulation and function using batch sequencing data.

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Area of Science:

  • Plant molecular biology
  • Genomics
  • Bioinformatics

Background:

  • Small RNAs (smRNAs), including microRNAs and small interfering RNAs, are crucial for gene regulation in plants.
  • High-throughput sequencing generates large datasets of smRNA sequences, necessitating efficient batch analysis tools.

Purpose of the Study:

  • To develop PsRobot, a user-friendly web tool for identifying plant smRNAs with stem-loop precursors (e.g., microRNAs, short hairpin RNAs) and their target genes.
  • To enable fast batch analysis of smRNA data and predict targets using a robust algorithm.

Main Methods:

  • PsRobot identifies smRNAs with stem-loop precursors from batch input data.
  • Target prediction employs a modified Smith-Waterman algorithm.
  • Integrates expression data from plant smRNA biogenesis mutants and protein complexes.
  • Evaluates target prediction reliability using mRNA cleavage (degradome) data.

Main Results:

  • PsRobot facilitates the identification of smRNAs and prediction of their targets.
  • Provides insights into smRNA generation and function by integrating expression data.
  • Enhances specificity and reliability of target predictions.
  • Offers analysis of cross-species conservation and target site multiplicity.

Conclusions:

  • PsRobot is a valuable, freely accessible web tool for plant smRNA research.
  • It streamlines the analysis of large smRNA datasets, aiding gene regulation studies.
  • The tool enhances the understanding of smRNA pathways and functions in plants.