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#Flavr Savr

2 public questions tagged with this topic.

First GM crop approved for human consumption was:

Flavr Savr tomato developed by Calgene Inc., Davis, California, holds historical status as first genetically modified whole food approved for commercial sale and human consumption. FDA completed voluntary consultation DST 1994 after molecular characterization, Southern blot showing two contiguous T-DNA inserts, compositional analysis comparing sugars, acids, lycopene, vitamin C, glycoalkaloids to non-transgenic parent, toxicity assessment of NPTII at acute dosing in mice, and allergenicity search revealing no homology to known allergens. USDA APHIS determined nonregulated status under 7CFR 340

Ref: Redenbaugh et al. Safety assessment Flavr Savr FDA 1992; Bruening & Lyons 2000 Food Chem Toxicol.

Selectable marker used in Flavr Savr tomato transformation was:

Selectable marker deployed for Flavr Savr regeneration was neomycin phosphotransferase II gene nptII from Tn5 transposon of Escherichia coli, conferring resistance to aminoglycoside antibiotics kanamycin, neomycin, G418 and paromomycin. Enzyme mechanism involves transfer of gamma phosphate from ATP to 3' hydroxyl of aminoglycoside, inactivating drug ability to bind 16S rRNA of 30S ribosomal subunit, preventing misreading and bactericidal action. Tomato cotyledon explants co-cultivated with Agrobacterium harboring antisense PG plus nptII under nos promoter placed on Murashige and Skoog organoge

Ref: Beck et al. Gene 1982 Tn5 nptII; Coruzzi et al. EMBO J 1984 Plant selectable markers; NIH.