Methods for Screening for Agents that Affect Development
The present invention provides an animal toxicity model that can be used to screen agents that may cause or increase the occurrence of a developmental defect. The invention also provides methods and compositions for creating such an animal toxicity model, as well as methods and kits for using these animal models.
1 . A method of determining whether an agent causes a developmental defect, the method comprising:
(a) exposing a toxicity mouse model to the agent, wherein the toxicity mouse model is a pregnant wildtype mother carrying transgenic embryos, wherein the transgenic embryos comprise a gene for production of human chorionic gonadotropin (hCG) operably linked to a promoter;
(b) determining if hCG is present in the blood of the toxicity mouse model by conducting a blood test on the wildtype mother,
wherein detection of hCG in the blood of the wildtype mother identifies the agent as causing developmental toxicity.
2 . The method of claim 1 , wherein the inducible promoter is near a gene associated with a developmental defect caused by the agent, such that an agent that causes the developmental defect activates the promoter which further causes transcription of hCG.
3 . The method of claim 1 , wherein the toxicity mouse model is produced by mating a transgenic male mouse to a wildtype female mouse.
4 . The method of claim 2 , wherein the inducible promoter is near a gene associated with inflammation.
5 . The method of claim 4 , wherein the gene associated with inflammation is a member selected from an interleukin, nitric oxide synthase, and tumor necrosis factor.
6 . The method of claim 1 , wherein the promoter is further linked to a member selected from a luminescent protein, a fluorescent protein, and firefly luciferase.