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Engineering the Unicellular Alga Phaeodactylum tricornutum for Enhancing Carotenoid Production

Authors
  • Manfellotto, Francesco
  • Stella, Giulio Rocco1, 2
  • Falciatore, Angela1, 3
  • Brunet, Christophe
  • Ferrante, Maria Immacolata
  • 1 (A.F.)
  • 2 Boston Consulting Group, Via Ugo Foscolo 1, 20121 Milano, Italy
  • 3 Laboratory of Chloroplast Biology and Light Sensing in Microalgae, UMR 7141, Centre National de la Recherche Scientifique (CNRS), Sorbonne Université, Institut de Biologie Physico-Chimique, F-75005 Paris, France
Type
Published Article
Journal
Antioxidants
Publisher
MDPI AG
Publication Date
Aug 16, 2020
Volume
9
Issue
8
Identifiers
DOI: 10.3390/antiox9080757
PMID: 32824292
PMCID: PMC7465010
Source
PubMed Central
Keywords
License
Green

Abstract

Microalgae represent a promising resource for the production of beneficial natural compounds due to their richness in secondary metabolites and easy cultivation. Carotenoids feature among distinctive compounds of many microalgae, including diatoms, which owe their golden color to the xanthophyll fucoxanthin. Carotenoids have antioxidant, anti-obesity and anti-inflammatory properties, and there is a considerable market demand for these compounds. Here, with the aim to increase the carotenoid content in the model diatom Phaeodactylum tricornutum , we exploited genetic transformation to overexpress genes involved in the carotenoid biosynthetic pathway. We produced transgenic lines over-expressing simultaneously one, two or three carotenoid biosynthetic genes, and evaluated changes in pigment content with high-performance liquid chromatography. Two triple transformants over-expressing the genes Violaxanthin de-epoxidase ( Vde ), Vde-related ( Vdr ) and Zeaxanthin epoxidase 3 ( Zep3 ) showed an accumulation of carotenoids, with an increase in the fucoxanthin content up to four fold. Vde , Vdr and Zep3 mRNA and protein levels in the triple transformants were coherently increased. The exact role of these enzymes in the diatom carotenoid biosynthetic pathway is not completely elucidated nevertheless our strategy successfully modulated the carotenoid metabolism leading to an accumulation of valuable compounds, leading the way toward improved utilization of microalgae in the field of antioxidants.

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