The present invention relates to novel transcription control elements,
including promoters, derived from angiogenesis-related genes,
particularly the mouse VEGF gene, the mouse VEGFR-2 receptor gene, and
the mouse Tie2 gene. Also disclosed are isolated polynucleotides
comprising such promoters, as well as nucleic acid constructs comprising
such promoters operatively linked to genes encoding a gene product, such
as, a reporter, a protein, polypeptide, hormone, ribozyme, or antisense
RNA, and to recombinant cells and transgenic animals comprising such
nucleic acid constructs. The present invention further relates to
screening methods using those recombinant cells and transgenic animals,
particularly methods of screening for therapeutic compounds that modulate
tumorigenesis and angiogenesis.