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How an 'evolutionary playground' brings plant genes together
Date:8/29/2011

ters didn't enter the plant's genomes by this route. Both of the clusters are found in 'dynamic' regions of the genome that are significantly enriched in transposable elements. These areas act like 'evolutionary playgrounds' where recombinations happen more frequently, bringing together different genes. When the gene clusters produce compounds that are useful to the plant, for example in fighting off pests, natural selection favours these clusters. Crucially, in both of the triterpene gene clusters found by the group, the clusters must be maintained as a whole. Losing one part of the cluster leads to the build up of toxic intermediates. This causes an evolutionary pressure to maintain the cluster as a whole, as this increases the chances of the all of the genes being inherited together.

Clustering also allows the genes to be controlled in a coordinated manner, and comparing the gene clusters gave the scientists hints of how this might happen. Both gene clusters show signs that they are regulated by the way the DNA molecule folds or unfolds into chromatin, whilst neighbouring genes outside the clusters don't. Furthermore, it appears that this level of coordinated gene expression has been acquired by the cluster after its assembly.

These insights into the way these gene clusters have evolved and function will be particularly valuable for efforts to fully exploit the potential of plants to produce valuable products. The ever-growing amount of data being generated by genome sequencing projects can be explored further, to try to discover similar gene clusters. For genes that have already been discovered, this information on clustering genes will help in efforts to use synthetic biology to optimise the production of new drugs, herbicides and other plant products.


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Contact: Andrew Chapple
andrew.chapple@nbi.ac.uk
44-160-325-1490
Norwich BioScience Institutes
Source:Eurekalert

Page: 1 2

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