Abstract
Micronutrient deficiency is a major global challenge because at any one time up to 50 % of the world’s population may suffer from diseases caused by a chronic insufficient supply of vitamins and minerals, and this largely reflects the lack of access to a diverse diet [1]. In developed countries, micronutrient deficiency is addressed by encouraging the consumption of fresh fruits and vegetables, along with supplementation and fortification programs to enhance the nutritional value of staple foods [2]. In contrast, the populations of developing countries typically subsist on a monotonous diet of milled cereal grains such as rice or maize, which are poor sources of vitamins and minerals. Strategies that have been proposed to overcome micronutrient deficiencies in developing countries include supplementation, fortification, and the implementation of conventional breeding and genetic engineering programs to generate nutrient-rich varieties of staple crops. Unfortunately, the first two strategies have been largely unsuccessful because of the insufficient funding, poor governance, and dysfunctional distribution network in developing country settings [3]. Biofortification programs based on conventional breeding have enjoyed only marginal success because of the limited available genetic diversity and the time required to develop crops with enhanced nutritional properties as well as desirable agronomic characteristics. It is also impossible to conceive of a conventional breeding strategy that would ever produce “nutritionally complete” cereals [2]. More promising results have been obtained by engineering the metabolic pathways leading to provitamin A, vitamin B9, and vitamin C (β-carotene, folate, and ascorbate) in the same transgenic corn line [4]. Genetic engineering therefore has immense potential to improve the nutritional properties of staple crops and contribute to better health, although a number of technical, economical, regulatory, and sociopolitical constraints remain to be addressed.
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Abbreviations
- Adcs:
-
Aminodeoxychorismate synthase
- CRTB:
-
Bacterial phytoene synthase
- CRTI:
-
Bacterial phytoene desaturase/isomerase
- CRTY:
-
Bacterial lycopene cyclase
- Dhar:
-
Dehydroascorbate reductase
- DHPS:
-
7,8-Dihydropteroate synthase
- EU:
-
European Union
- folE:
-
E. coli GTP cyclohydrolase
- FPGS:
-
Folypolyglutamate synthetase
- GalLDH:
-
l-Galactono-1,4-lactone dehydrogenase
- gch1:
-
GTP cyclohydrolase 1
- GGP:
-
GDP-l-galactose phosphorylase
- GGPP:
-
Geranylgeranyl diphosphate
- Glbch:
-
Gent iana lutea β-carotene hydroxylase
- Gllycb:
-
Gentiana lutea lycopene β-cyclase
- GLOase:
-
l-Gulono1,4-lactone oxidase
- GME:
-
GDP-d-mannose-3′,5′-epimerase
- HGA:
-
Homogentisic acid
- HMDHP:
-
Hydroxymethyldihydropterin
- HPP:
-
ρ-Hydroxyphenylpyruvic acid
- HPPD:
-
ρ-Hydroxyphenylpyruvic acid dioxygenase
- HPPK:
-
6-Hydroxymethyl-7,8-dihydropterin pyrophosphokinase
- HPT1:
-
Homogentisate phytyltransferase
- MDHA:
-
Monodehydroascorbate
- MPBQ:
-
2-Methyl-6-phytylbenzoquino
- MPBQ MT:
-
MPBQ methyltransferase
- Or:
-
Orange
- PABA:
-
p-Aminobenzoate
- PacrtI:
-
Pantoea ananatis phytoene desaturase
- ParacrtW:
-
Paracoccus β-carotene ketolase
- PSY1:
-
Phytoene synthase
- RAE:
-
Retinol activity equivalent
- RDI:
-
Reference daily intake
- RNAi:
-
RNA interference
- TC:
-
Tocopherol cyclase
- TyrA:
-
Prephenate dehydrogenase
- Zmpsy1:
-
Zea mays phytoene synthase 1
- γ-TMT:
-
γ-Tocopherol methyltransferase
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Acknowledgement
Research at the Universitat de Lleida is supported by MICINN, Spain (BIO2011-23324; BIO02011-22525; BIO2012-35359; PIM2010PKB-00746); European Union Framework 7 Program-SmartCell Integrated Project 222716; European Union Framework 7 European Research Council IDEAS Advanced Grant (to PC) Program-BIOFORCE; RecerCaixa; COST Action FA0804: Molecular farming: plants as a production platform for high value proteins; Centre CONSOLIDER on Agrigenomics funded by MICINN, Spain.
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Farré, G. et al. (2013). Transgenic Multivitamin Biofortified Corn: Science, Regulation, and Politics. In: Preedy, V., Srirajaskanthan, R., Patel, V. (eds) Handbook of Food Fortification and Health. Nutrition and Health. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4614-7076-2_26
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