Detection of genes involved in fatty acid elongation and desaturation in thraustochytrid marine eukaryotes

Naoki Nagano, Keishi Sakaguchi, Yousuke Taoka, Yuji Okita, Daiske Honda, Makoto Ito, Masahiro Hayashi

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Heterotrophic marine protists known as thraustochytrids can synthesize polyunsaturated fatty acids (PUFAs) such as docosahexaenoic acid (DHA). The biosynthetic pathways of PUFAs in thraustochytrids are poorly understood, however. In this study, we attempted to reveal the enzymes involved in DHA synthesis in thraustochytrids. Nine thraustochytrid strains representing 3 genera (Aurantiochytrium, Schizochytrium, and Thraustochytrium) were used for PCR-based detection of the genes encoding Δ5-elongase and Δ4-desaturase and for fatty acid analysis. The degenerate primers were designed to amplify the Δ5-elongase and Δ4-desaturase genes, and the partial sequences of the enzymes were obtained from the genera Thraustochytrium and Schizochytrium. These fragments were identical to those of known Δ5-elongase and Δ4-desaturase. Neither Δ5-elongase nor Δ4-desaturase was detected in the strains belonging to the genus Aurantiochytrium, however, suggesting that this group likely synthesizes DHA not via the elongation/desaturation pathway but via an alternate pathway such as the polyketide synthase pathway. The fatty acid profiles of thraustochytrids were consistent with the presence of genes involved in PUFA biosynthesis in thraustochytrid genera. Thus, our fi ndings suggest that two biosynthetic pathways for PUFAs exist in these organisms.

Original languageEnglish
Pages (from-to)475-481
Number of pages7
JournalJournal of oleo science
Volume60
Issue number9
DOIs
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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