highly significantP < 2 × 10 −15
Indeed, we found a mild yet highly significant correlation between changes in gene expression in Chaserr –/– mEFs and the distance to the TTS of the closest tandem upstream gene (Spearman R = 0.2, P < 2 × 10 −15 ), with the effect observed mostly when the distance was shorter than ~6 kb (Fig. 4e ).