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The miRNome function transitions from regulating developmental genes to transposable elements during pollen

Cecilia Oliver1, Maria Luz Annacondia1, Zhenxing Wang1,2,3

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Plant microRNAs (miRNAs) regulate both genes and transposable elements (TEs) during pollen development. This study reveals a shift from gene regulation to TE regulation as pollen matures.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • MicroRNAs (miRNAs) are crucial for regulating gene expression and development in plants.
  • Plant miRNAs are implicated in targeting transposable elements (TEs) and producing small interfering RNAs (siRNAs).
  • The specific roles and genome-wide targets of miRNAs during pollen development remain largely uncharacterized.

Purpose of the Study:

  • To investigate the dynamics and activity of miRNAs during pollen development in Arabidopsis thaliana.
  • To identify mRNA targets regulated by miRNAs in pollen at a genome-wide scale.
  • To understand the integration of miRNA roles in regulating both developmental genes and TEs.

Main Methods:

  • Small RNA and degradome parallel high-throughput sequencing were employed.
  • Analysis focused on distinct stages of pollen development, from microspore to mature pollen.
  • miRNAs associated with Argonaute (AGO) proteins AGO1 and AGO5 were identified.

Main Results:

  • A comprehensive profile of miRNA activity during pollen development was generated.
  • Genome-wide mRNA targets of pollen-expressed miRNAs were uncovered.
  • A developmental transition was observed, with miRNAs shifting from targeting developmental genes to regulating TEs.

Conclusions:

  • Plant miRNAs play a dual role in pollen development, regulating both gene expression and transposable element activity.
  • The transition in miRNA targeting reflects a shift in regulatory priorities during pollen maturation.
  • Understanding these miRNA dynamics is key to comprehending male gametophyte development and genome stability.