Liverpool, United Kingdom
December 10, 2015
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.
Opening up new possibilities
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.
Building on expertise
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.”
The project was funded as part of the ERA-CAPS programme, with support from the Biotechnology and Biological Sciences Research Council (BBSRC).
The paper ‘A genome-wide survey of DNA methylation in hexaploid wheat’ is published in the journal Genome Biology.
Crean el primer mapa epigenético del trigo
Source: Fundacion Antama
Científicos de la Universidad de Liverpool (Reino Unido) han completado con éxito el primer mapa del epigenoma del trigo. Se trata de un estudio detallado de los cambios moleculares que regulan la actividad de los genes hereditarios en el trigo. Las marcas epigenéticas son etiquetas químicas que se unen físicamente al ADN modificando su función sin cambiar el propio código genético. La metilación del ADN es un mecanismo epigenético que controla la expresión génica que puede pasar a generaciones futuras. Los avances tecnológicos han permitido a los científicos estudiar la metilación del ADN del trigo en todo su genoma.
El descubrimiento, publicado en Genome Biology, ha evidenciado que la metilación se conserva en los tres genomas del trigo hexaploide, pero encontró también evidencia de sub-metilación específica del genoma. También se encontraron cambios en la metilación asociada con cambios en la expresión de genes y, aunque no se ha demostrado, éstos podrían afectar al fenotipo.
El director del estudio, Anthony Hall, ha señalado que “con la capacidad de caracterizar los patrones de metilación de todo el genoma del trigo ahora podemos abordar cuestiones fundamentales, como el papel de la epigenética en la domesticación de los cultivos y de la estabilidad, y de larga término función de la metilación “.
En esta línea también señaló que este hallazgo permitirá ” tratar de entender cómo la metilación cambia rasgos tan importantes para los agricultores como resistencia a enfermedades o la variabilidad del rendimiento. Todos estos son temas clave para la investigación futura de nuestro equipo y tendrán un impacto en la agricultura mundial “.
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