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New insights into tomato microRNAs.

Thaís Cunha de Sousa Cardoso1, Tamires Caixeta Alves1, Carolina Milagres Caneschi1

  • 1Laboratory of Bioinformatics and Molecular Analysis, Federal University of Uberlandia (UFU), Campus Patos de Minas, 38700-128, Patos de Minas, Brazil.

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Summary

This study identifies novel microRNAs (miRNAs) and their target genes in cultivated tomato (Solanum lycopersicum) and wild tomato (Solanum pennellii), advancing understanding of miRNA processing pathways in these important fruit species.

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Area of Science:

  • Plant molecular biology
  • Genomics
  • Biotechnology

Background:

  • MicroRNAs (miRNAs) are crucial regulators of gene expression, impacting plant development and stress responses.
  • Tomato, including cultivated (Solanum lycopersicum) and wild (Solanum pennellii) species, is a vital crop with significant genetic resources for improvement.
  • Understanding miRNA pathways is essential for enhancing tomato traits through breeding and genetic engineering.

Purpose of the Study:

  • To identify and characterize genes, miRNA molecules, and target genes involved in miRNA processing in S. lycopersicum and S. pennellii.
  • To discover novel miRNAs and miRNA families in both tomato species.
  • To compare miRNA profiles between cultivated and wild tomato relatives.

Main Methods:

  • Next-generation sequencing (NGS) libraries were utilized to identify small RNAs and related genes.
  • Quantitative reverse transcription PCR (qRT-PCR) was employed to validate the presence of pathway genes and specific miRNA families.
  • Bioinformatic analyses were performed to predict miRNA targets and identify novel miRNA sequences and families.

Main Results:

  • A significant number of putative small RNA processing proteins were identified in both species (71 in S. lycopersicum, 108 in S. pennellii).
  • Numerous mature and precursor miRNAs were discovered, including 192 novel miRNAs from 38 new families in S. lycopersicum and all identified miRNAs in S. pennellii were previously unpublished.
  • A large set of miRNA targets was predicted for both S. lycopersicum (2471) and S. pennellii (3462).

Conclusions:

  • This research provides a comprehensive catalog of miRNAs and their processing machinery in S. lycopersicum and S. pennellii.
  • The findings reveal substantial differences and novelties in miRNA repertoires between cultivated and wild tomato species.
  • The identified miRNAs and targets offer valuable genetic resources for future tomato breeding and functional genomics studies.