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A Tie2‐driven BAC‐TRAP transgenic line for in vivo endothelial gene profiling

Recent technological innovations including bacterial artificial chromosome‐based translating ribosome affinity purification (BAC‐TRAP) have greatly facilitated analysis of cell type‐specific gene expression in vivo, especially in the nervous system. To better study endothelial gene expression in vivo, we have generated a BAC‐TRAP transgenic mouse line where the L10a ribosomal subunit is tagged with EGFP and placed under the control of the endothelium‐specific Tie2 (Tek) promoter. We show that transgene expression in this line is widely, but specifically, detected in endothelial cells in several brain regions throughout pre‐ and postnatal development, as well as in other organs. We also show that this line results in highly significant enrichment of endothelium‐specific mRNAs from brain tissues at different stages. This BAC‐TRAP line therefore provides a useful genetic tool for in vivo endothelial gene profiling under various developmental, physiological, and pathological conditions. genesis 54:136–145, 2016. © 2016 Wiley Periodicals, Inc.