miniCoopR Vector-based Transgenesis: A Technique to Screen Melanoma-inducing Genes in Zebrafish Tumor Model

- In zebrafish, melanoma arises from the malignant transformation of melanocytes - the melanin-producing cells. To study melanoma onset, use a melanoma-prone, melanocyte deficient transgenic zebrafish model. This model lacks melanocytes due to a loss-of-function mutation in its melanocyte-specific mitfa promoter.

Begin by taking a single-celled embryo of this transgenic model on an agar plate. Co-inject a mix containing a transposon-based miniCoopR vector and transposase enzyme mRNAs into the embryo. The vector contains a gene cassette, comprising a promoter-carrying mitfa minigene coupled to a candidate gene sandwiched between two transposon elements.

The co-injected mRNAs encode transposase proteins. These proteins act on the transposon elements and catalyze the cassette excision from the miniCoopR vector, followed by its integration into the genomic DNA of the embryo. Subsequently, the cassette promoter drives the expression of both the mitfa gene and the candidate gene of interest.

The mitfa gene supports melanocyte rescue and development, while the candidate gene, if oncogenic, induces melanoma onset. Screen the developed zebrafish. Transgenic fish with rescued melanocytes dev