Genome wide analysis of fatty acid desaturation and its response to temperature

A - Papers appearing in refereed journals

Menard, G. N., Martin-Moreno, J., Bryant, F. M., Munoz-Azcarate, O., Kelly, A. A., Hassani-Pak, K., Kurup, S. and Eastmond, P. J. 2017. Genome wide analysis of fatty acid desaturation and its response to temperature. Plant Physiology. 173 (3), pp. 1594-1605.

AuthorsMenard, G. N., Martin-Moreno, J., Bryant, F. M., Munoz-Azcarate, O., Kelly, A. A., Hassani-Pak, K., Kurup, S. and Eastmond, P. J.
Abstract

Plants modify the polyunsaturated fatty acid content of their membrane and storage lipids in order to adapt to changes in temperature. In developing seeds, this response is largely controlled by the activities of the microsomal ω-6 and ω-3 fatty acid desaturases, FAD2 and FAD3. Although temperature regulation of desaturation has been studied at the molecular and biochemical levels, the genetic control of this trait is poorly understood. Here, we have characterized the response of Arabidopsis (Arabidopsis thaliana) seed lipids to variation in ambient temperature and found that heat inhibits both ω-6 and ω-3 desaturation in phosphatidylcholine, leading to a proportional change in triacylglycerol composition. Analysis of the 19 parental accessions of the multiparent advanced generation intercross (MAGIC) population showed that significant natural variation exists in the temperature responsiveness of ω-6 desaturation. A combination of quantitative trait locus (QTL) analysis and genome-wide association studies (GWAS) using the MAGIC population suggests that ω-6 desaturation is largely controlled by cis-acting sequence variants in the FAD2 5′ untranslated region intron that determine the expression level of the gene. However, the temperature responsiveness of ω-6 desaturation is controlled by a separate QTL on chromosome 2. The identity of this locus is unknown, but genome-wide association studies identified potentially causal sequence variants within ∼40 genes in an ∼450-kb region of the QTL.

Year of Publication2017
JournalPlant Physiology
Journal citation173 (3), pp. 1594-1605
Digital Object Identifier (DOI)doi:10.1104/pp.16.01907
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDesigning Seeds for Nutrition and Health (DS)
Designing oilseeds for nutrition and health
Publisher's version
Copyright license
CC BY
Output statusPublished
Publication dates
Online03 Mar 2017
Publication process dates
Accepted20 Jan 2017
ISSN0032-0889
PublisherAmerican Society of Plant Biologists (ASPB)

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