Specificity Guides Interpretation: On H3K4 Methylation at Enhancers and Broad Promoters
Shah, R. N.; Ruthenburg, A. J.
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In 2018, we used internally calibrated chromatin immunoprecipitation (ICeChIP) to find that many of the most commonly used antibodies against H3K4 methylforms had significant off-target binding, which compromised the findings of at least eight literature paradigms that used these antibodies for ChIP-seq (Shah et al., 2018). In many cases, we were able to recapitulate the prior findings in K562 cells with the original, low-quality antibody, only to find that the models did not hold up to scrutiny with highly specific reagents and quantitative calibration. In a recent preprint originally prepared as a Letter to the Editor of Molecular Cell, though they agree with our overarching conclusions, Pekowska and colleagues take issue with analyses presented for two relatively minor points of the paper (Pekowska et al., 2023). We are puzzled by the assertion that these two points constitute the "bulk" of our findings, nor is it clear which components of our "analytical design" they find problematic. We feel their critique, however mild, is misguided.
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