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Related Experiment Video

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DNAzyme-dependent Analysis of rRNA 2’-O-Methylation

DNAzyme-dependent Analysis of rRNA 2’-O-Methylation

Published on: September 16, 2019

Small RNAs, DNA methylation and transposable elements in wheat.

Dario Cantu¹, Leonardo S Vanzetti, Adam Sumner

¹Department of Plant Sciences, University of California Davis, One Shields Ave, Davis, CA, USA.

|June 30, 2010

Summary

Wheat genomes utilize small non-coding RNAs (sRNAs) to silence transposable elements (TEs). This study reveals sRNA distribution across TE classes and their role in methylation, impacting TE inactivation.

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Area of Science:

Genomics
Epigenetics
Molecular Biology

Background:

Wheat genomes are largely composed of transposable elements (TEs).
Active TEs can cause mutations, necessitating their suppression via small non-coding RNAs (sRNAs).
sRNAs mediate transcriptional (24-nt) and post-transcriptional (21-nt) silencing of TEs.

Purpose of the Study:

To investigate the distribution of 24-nt and 21-nt sRNAs across wheat TE classes.
To identify regions within TEs targeted by sRNAs.
To assess the impact of sRNA targeting on DNA methylation patterns in TEs.

Main Methods:

Construction of a hexaploid wheat sRNA library.
Database development integrating new and public wheat sRNA libraries.
Analysis of sRNA matches to TE sequences in sequenced contigs and the Triticeae Repeat Sequence database.
Assessment of mutation frequency in methylated vs. non-methylated regions.

Main Results:

A significant fraction of wheat sRNAs originate from TEs.
sRNA abundance correlates with TE class abundance.
21-nt sRNAs primarily target miniature inverted repeat transposable elements (MITEs), especially terminal inverted repeats (TIRs).
24-nt sRNAs predominantly target Class I and Class II TEs, particularly long terminal repeats (LTRs).
TEs show a three-fold higher mutation frequency in methylated regions, consistent with sRNA-directed methylation.

Conclusions:

sRNA-directed silencing is crucial for short-term TE suppression in wheat.
DNA methylation and increased mutation rates offer long-term TE inactivation mechanisms.
This study elucidates the interplay between wheat epigenomes and transposable elements.