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Articles

Antibodies as epidemiological markers of genetically modified crop exposure: detection of Cry1Ab-specific IgG

, , , , &
Pages 779-788 | Received 19 Dec 2016, Accepted 27 Mar 2017, Published online: 14 Apr 2017

Figures & data

Figure 1. Recombinant Cry1Ab. Lane 1, Cry1Ab stained with Coomassie brilliant blue. Lane 2, recognition of Cry1Ab polyclonal rabbit anti-Cry1Ab IgG. Molecular weight markers are indicated as kilodalton.

Figure 1. Recombinant Cry1Ab. Lane 1, Cry1Ab stained with Coomassie brilliant blue. Lane 2, recognition of Cry1Ab polyclonal rabbit anti-Cry1Ab IgG. Molecular weight markers are indicated as kilodalton.

Figure 2. Antibody responses to Cry1 in adults from the USA (N = 100), Kenya (N = 100), and PNG (N = 100). Putative negative controls were from 20 Kenyan children aged 6–24 months. Polyclonal rabbit anti-Cry1Ab IgG (1:2000) served as a positive control. The quantitative cutoff value (mean of negative control cohort +3 SD), which defines the presence or absence of Cry1Ab-specific IgG, is indicated by the dotted line. All sera samples were diluted 1:200.

Figure 2. Antibody responses to Cry1 in adults from the USA (N = 100), Kenya (N = 100), and PNG (N = 100). Putative negative controls were from 20 Kenyan children aged 6–24 months. Polyclonal rabbit anti-Cry1Ab IgG (1:2000) served as a positive control. The quantitative cutoff value (mean of negative control cohort +3 SD), which defines the presence or absence of Cry1Ab-specific IgG, is indicated by the dotted line. All sera samples were diluted 1:200.

Figure 3. Cry1Ab-specific IgG Western blotting with sera from the highest ELISA responder of each population. Lane 1, Western Blot of Cry1Ab recognized by alkaline phosphatase-conjugated polyclonal rabbit anti-Cry1Ab IgG. Lanes 2–4, sera with the highest ODs (from ) from PNG, Kenya, and the USA, respectively. Lanes 5–7, sera negative for anti-Cry1Ab IgG (below cutoff threshold in ). Western blots were probed with sera diluted 1:200. Lane 1 is Cry1 probed with rabbit polyclonal and Cry1 antibodies.

Figure 3. Cry1Ab-specific IgG Western blotting with sera from the highest ELISA responder of each population. Lane 1, Western Blot of Cry1Ab recognized by alkaline phosphatase-conjugated polyclonal rabbit anti-Cry1Ab IgG. Lanes 2–4, sera with the highest ODs (from Figure 2) from PNG, Kenya, and the USA, respectively. Lanes 5–7, sera negative for anti-Cry1Ab IgG (below cutoff threshold in Figure 2). Western blots were probed with sera diluted 1:200. Lane 1 is Cry1 probed with rabbit polyclonal and Cry1 antibodies.

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