Posted by: shrikantmantri | May 3, 2010

Lateral Transfer of Genes from Fungi Underlies Carotenoid Production in Aphids

Science 30 April 2010:
Vol. 328. no. 5978, pp. 624 – 627
DOI: 10.1126/science.1187113

Reports

Lateral Transfer of Genes from Fungi Underlies Carotenoid Production in Aphids

Nancy A. Moran1,* and Tyler Jarvik2

Carotenoids are colored compounds produced by plants, fungi, and microorganisms and are required in the diet of most animals for oxidation control or light detection. Pea aphids display a red-green color polymorphism, which influences their susceptibility to natural enemies, and the carotenoid torulene occurs only in red individuals. Unexpectedly, we found that the aphid genome itself encodes multiple enzymes for carotenoid biosynthesis. Phylogenetic analyses show that these aphid genes are derived from fungal genes, which have been integrated into the genome and duplicated. Red individuals have a 30-kilobase region, encoding a single carotenoid desaturase that is absent from green individuals. A mutation causing an amino acid replacement in this desaturase results in loss of torulene and of red body color. Thus, aphids are animals that make their own carotenoids.

1 Department of Ecology and Evolutionary Biology, 1041 East Lowell Street, University of Arizona, Tucson, AZ 85721, USA.
2 Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, USA.

Posted via email from Sharing significant bytes —(Shrikant Mantri)

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