• TROP2 is a tumor-associated calcium ion signal transduction protein and a cell surface glycoprotein, which is highly expressed in tumor tissues. It can promote the growth, proliferation and metastasis of tumor cells by regulating the calcium signaling pathway, the expression of cyclin and reducing the adhesion of fibronectin. 
• The exon 1 of mouse Trop2 gene that encodes signal peptide, extracellular domain, transmembrane domain, cytoplasmic region are replaced by human counterparts in B-NDG hTROP2 mice. The promoter, 5’UTR and 3’UTR region  of the mouse gene are retained. The human TROP2 expression is driven by endogenous mouse Trop2 promoter, while mouse Trop2 gene transcription and translation will be disrupted. 
• Mouse Trop2 mRNA was only detectable in wild-type B-NDG mice. Human TROP2 mRNA was only detectable in homozygous B-NDG hTROP2 mice. 
• Application: This product is used for the safety evaluation of antitumor drugs.

Gene targeting strategy for B-NDG hTROP2 mice. The exon 1 of mouse Trop2 gene that encodes signal peptide, extracellular domain, transmembrane domain, cytoplasmic region are replaced by human counterparts in B-NDG hTROP2 mice. The promoter, 5’UTR and 3’UTR region  of the mouse gene are retained. The human TROP2 expression is driven by endogenous mouse Trop2 promoter, while mouse Trop2 gene transcription and translation will be disrupted. 

Species specific analysis of TROP2 gene expression in wild-type B-NDG mice and homozygous humanized B-NDG hTROP2 mice by RT-PCR. Skin was collected from wild-type B-NDG mice (+/+) and homozygous B-NDG hTROP2 mice (H/H). Mouse Trop2 mRNA was detectable in wild-type B-NDG mice but not in homozygous B-NDG hTROP2 mice. Human TROP2 mRNA was exclusively detectable in homozygous B-NDG hTROP2 mice but not in wild-type B-NDG mice.