title: Skin prick tests reveal stable and heritable reduction of allergenic potency of gene-silenced tomato fruits.
abstract: BACKGROUND
  Today, for patients with food allergy, the only possibility to prevent allergic reactions is avoidance of the allergenic food. Genetic engineering of hypoallergenic plants by means of RNA interference (RNAi) could be an approach to improve the quality of life of subjects with food allergy.
  
  
  OBJECTIVE
  We sought to achieve stable inhibition of expression of the allergenic nonspecific lipid transfer protein Lyc e 3 in tomato and to analyze the reduction of allergenicity in vitro by using histamine release assays and in vivo by using skin prick tests with transgenic tomato fruits.
  
  
  METHODS
  Gene silencing was performed by means of RNAi and monitored by using Western blotting with nonspecific lipid transfer protein-specific antibodies and sera from patients with tomato allergy. Dose-dependent basophil histamine release assays, prick-to-prick skin testing, and determination of endogenous histamine content were performed with fruits harvested from plants of the first and second generation to assess the allergenic potency compared with that of wild-type fruits.
  
  
  RESULTS
  We demonstrated that silencing of Lyc e 3 by means of RNAi contributes to reduced skin reactivity and is passed on to the next generation of fruits. A significant reduction of allergenic potency was determined in vitro and confirmed by using skin prick tests.
  
  
  CONCLUSIONS
  Taken together, these results indicate that RNAi technology is an effective tool to generate foods with reduced allergenicity.
  
  
  CONCLUSIONS
  Allergen-reduced plant foods might allow reduction of dietary restrictions for patients allergic to panallergen families.
authors.affiliation: Paul-Ehrlich-Institut, Langen, Germany.
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Lorenz
authors.forename: Ernesto
authors.initials: E
authors.lastname: Enrique
authors.forename: Lien
authors.initials: L
authors.lastname: Lequynh
authors.forename: Kay
authors.initials: K
authors.lastname: Fötisch
authors.forename: Mechthild
authors.initials: M
authors.lastname: Retzek
authors.forename: Sophia
authors.initials: S
authors.lastname: Biemelt
authors.forename: Uwe
authors.initials: U
authors.lastname: Sonnewald
authors.forename: Stefan
authors.initials: S
authors.lastname: Vieths
authors.forename: Stephan
authors.initials: S
authors.lastname: Scheurer
mesh_terms: D000328:Adult; D052179:Antigens, Plant / Q000235:genetics / Q000276:immunology*; D005260:Female; D005512:Food Hypersensitivity / Q000175:diagnosis* / Q000276:immunology; D020868:Gene Silencing; D006801:Humans; D018551:Solanum lycopersicum / Q000235:genetics* / Q000276:immunology*; D008297:Male; D030821:Plants, Genetically Modified / Q000276:immunology*; D034622:RNA Interference; D012882:Skin Tests
chemical_list: D052179:Antigens, Plant