Reduced allergenicity of tomato fruits harvested from Lyc e 1-silenced transgenic tomato plants.
BACKGROUND
Profilin is a small actin-binding protein that contributes to the allergenic potency of many fruits and vegetables, including tomato. Two highly similar genes encoding tomato profilin have been isolated and designated as allergen Lyc e 1.01 and Lyc e 1.02.


OBJECTIVE
The aim of the study was to generate profilin-reduced hypoallergenic tomato fruits by silencing of both genes in transgenic tomato plants by means of RNA interference (RNAi).


METHODS
The efficiency of gene silencing was documented by means of Northern blotting, immunoblotting, and skin prick testing.


RESULTS
Quantification of the remaining protein revealed that profilin accumulation in transgenic fruits was decreased 10-fold compared with that seen in untransformed controls. This decrease was sufficient to cause a reduced allergenic reactivity in patients with tomato allergy, as determined with skin prick tests. Because most patients with tomato allergy are not monosensitized to profilin, the IgE reactivity to the profilin-silenced tomato fruits in vivo varied widely between individuals tested.


CONCLUSIONS
We could demonstrate the efficient silencing of both profilin genes in transgenic tomato plants using RNAi. This resulted in Lyc e 1-diminished tomato fruits, providing proof of concept and demonstrating that RNAi can be used to design allergen-reduced food. However, simultaneous silencing of multiple allergens will be required to design hypoallergenic tomatoes.


CONCLUSIONS
Our findings demonstrate the feasibility of creating low-allergenic food by using RNAi. This concept constitutes a novel approach to allergen avoidance.
Le
Lien Quynh
LQ
Department of Biochemistry, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany.
Mahler
Vera
V
Lorenz
Yvonne
Y
Scheurer
Stephan
S
Biemelt
Sophia
S
Vieths
Stefan
S
Sonnewald
Uwe
U
D000328:Adult; D000485:Allergens / Q000009:adverse effects / Q000235:genetics*; D052179:Antigens, Plant; D005260:Female; D005512:Food Hypersensitivity / Q000097:blood / Q000276:immunology*; D030841:Food, Genetically Modified; D020868:Gene Silencing; D006801:Humans; D018551:Solanum lycopersicum / Q000009:adverse effects / Q000235:genetics* / Q000276:immunology*; D008875:Middle Aged; D030821:Plants, Genetically Modified; D034622:RNA Interference
D000485:Allergens; D052179:Antigens, Plant; C488367:Lyc e 1 allergen, Lycopersicon esculentum