The human complementary DNAs (cDNAs) fragment encoding the full-length ZEB1 sequence41 (link) was prepared by PCR and cloned into pLV-EF1-MCS-IRES-Bsd (Biosettia). The lentiviral-based vector pLV-H1-EF1α-puro (Biosettia) was used to express shRNAs in breast cancer cells. The human ATM promoter (−1534/+235) sequences were obtained by PCR from human genomic DNA and cloned into pGL3‑basic vector (Promega). Mutagenesis of the E2‑box in the human ATM promoter was performed using a QuikChange Site‑Directed Mutagenesis kit (Stratagene).
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