Background
CTCF is a conserved, ubiquitous and multifunctional 11 Zn finger (ZF) transcription factor with features of a tumour suppressor. CTCF regulates transcription in diverse modes, such as promoter activation and repression, silencing, constitutive and methylation-dependent chromatin insulation. We have previously reported that CTCF can be post-translationally regulated by poly(ADPribosyl)ation and that this modification modulates the insulator function of CTCF [1, 2]. The purpose of the present study is to investigate the role of CTCF poly(ADPribosyl)ation in normal and breast cancer cells.