Ap2b1^{TgTn(sb-cHS4,Tyr)2343AOve}

The SB-cHS4core-SB-Tyro-WPRE-FUGW lentiposon transgene (LV2229) was designed with a Sleeping Beauty (SB) transposon (inward-facing SB arms flanking a tandem pair of cHS4 core insulator elements), followed by a mouse tyrosinase minigene (Tyro) and a woodchuck hepatitis virus post-transcriptional regulatory element (WPRE) in the FUGW self-inactivating HIV-based lentiviral vector backbone. The SB transposon and Tyro minigene replaced the ubiquitin-c promoter and EGFP sequences originally found in the FUGW lentiviral vector. The SB transposon used in this transgene has an inverted repeat/direct repeat sequence (IR/DR; the SB transposon recognition site), two copies of the 0.25 kb chicken beta-globin core insulator element (cHS4 core), and a second IR/DR sequence. The IR/DR sequences are inward-facing (pointed towards the cHS4core). The cHS4 core insulator element functions to terminate transcription of the upstream locus into which it integrates (and also enhance expression from the downstream Tyro minigene). The Tyro minigene is composed of the mouse Tyr enhancer region (623 bp), promoter region (657 bp), and 1566 bp cDNA sequence (including the stop codon); all in sense orientation relative to the FUGW backbone. There is no polyA site between the Tyro minigene and WPRE sequence. The WPRE sequence functions to enhance the mRNA transcript stability. In line OVE2343A, a single copy of the lentiposon inserted into intron 4 [NCBI37/mm9; 3'-83,136,021(-)] in the antisense orientation. (J:175597)