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First map of the wheat epigenome created

Date:
December 10, 2015
Source:
University of Liverpool
Summary:
The first ever genome-wide survey has been conducted of heritable molecular changes that regulate gene activity in wheat, in what could become a new tool to improve crop breeding technologies.
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This image shows the wheat fields.
Credit: Professor Anthony Hall

Scientists at the University of Liverpool have carried out the first ever genome-wide survey of heritable molecular changes that regulate gene activity in wheat, in what could become a new tool to improve crop breeding technologies.

Epigenetic marks are chemical tags which physically attach themselves to DNA, and modify its function without changing the genetic code. DNA methylation is one such mechanism of epigenetic gene expression control that can be passed down to future generations.

Now, developing technology has allowed scientists to study DNA methylation across the complex and challenging wheat genome.

Dr Laura Gardiner, from the University's Centre for Genomic Research, said: "Due to the sheer size of the wheat genome, undertaking a survey like this has been technically unworkable until now, but understanding how and when genes are activated is a key part of understanding its complexity.

"This work opens up a whole new level of genetic variation which can be exploited by wheat breeders. In the future we see epigenetic marks becoming an important new tool in this area."

Using a combination of sodium bisulphate treatment and targeted gene enrichment, the team observed that methylation is highly conserved across all three genomes of hexaploid wheat, but found evidence of sub-genome specific methylation.

Methylation changes were also found to be associated with changes in gene-expression and, although not demonstrated, these changes are likely to affect the phenotype. The stability of methylation in the wheat genome was also shown, with some methylation patterns conserved for over 0.5 million years.

Liverpool scientists created the first draft of the wheat genome in 2012, enabling new levels of precision breeding for this globally important food source which provides 20% of daily calories and protein for the world's population.

Professor Anthony Hall, who led the study, added: "With the ability to characterise genome-wide patterns of methylation we can now address fundamental questions in wheat, such as the role of epigenetics in the domestication of crops and the stability and long-term function of methylation.

"We can also seek to understand how methylation changes important traits for farmers like disease resistance and yield variability. These are all key topics for future research at Liverpool and will impact on world agriculture."


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Materials provided by University of Liverpool. Note: Content may be edited for style and length.


Journal Reference:

  1. Laura-Jayne Gardiner, Mark Quinton-Tulloch, Lisa Olohan, Jonathan Price, Neil Hall, Anthony Hall. A genome-wide survey of DNA methylation in hexaploid wheat. Genome Biology, 2015; 16 (1) DOI: 10.1186/s13059-015-0838-3

Cite This Page:

University of Liverpool. "First map of the wheat epigenome created." ScienceDaily. ScienceDaily, 10 December 2015. <www.sciencedaily.com/releases/2015/12/151210031202.htm>.
University of Liverpool. (2015, December 10). First map of the wheat epigenome created. ScienceDaily. Retrieved May 24, 2017 from www.sciencedaily.com/releases/2015/12/151210031202.htm
University of Liverpool. "First map of the wheat epigenome created." ScienceDaily. www.sciencedaily.com/releases/2015/12/151210031202.htm (accessed May 24, 2017).

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