A ChIP-exo screen of 887 Protein Capture Reagents Program transcription factor antibodies in human cells

William K.M. Lai, Luca Mariani, Gerson Rothschild, Edwin R. Smith, Bryan J. Venters, Thomas R. Blanda, Prashant K. Kuntala, Kylie Bocklund, Joshua Mairose, Sarah N. Dweikat, Katelyn Mistretta, Matthew J. Rossi, Daniela James, James T. Anderson, Sabrina K. Phanor, Wanwei Zhang, Zibo Zhao, Avani P. Shah, Katherine Novitzky, Eileen McAnarneyMichael C. Keogh, Ali Shilatifard, Uttiya Basu, Martha L. Bulyk, B. Franklin Pugh

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Antibodies offer a powerful means to interrogate specific proteins in a complex milieu. However, antibody availability and reliability can be problematic, whereas epitope tagging can be impractical in many cases. To address these limitations, the Protein Capture Reagents Program (PCRP) generated over a thousand renewable monoclonal antibodies (mAbs) against human presumptive chromatin proteins. However, these reagents have not been widely field-tested. We therefore performed a screen to test their ability to enrich genomic regions via chromatin immunoprecipitation (ChIP) and a variety of orthogonal assays. Eight hundred eighty-seven unique antibodies against 681 unique human transcription factors (TFs) were assayed by ultra-high-resolution ChIP-exo/seq, generating approximately 1200 ChIP-exo data sets, primarily in a single pass in one cell type (K562). Subsets of PCRP mAbs were further tested in ChIP-seq, CUT&RUN, STORM super-resolution microscopy, immunoblots, and protein binding microarray (PBM) experiments. About 5% of the tested antibodies displayed high-confidence target (i.e., cognate antigen) enrichment across at least one assay and are strong candidates for additional validation. An additional 34% produced ChIP-exo data that were distinct from background and thus warrant further testing. The remaining 61% were not substantially different from background, and likely require consideration of a much broader survey of cell types and/or assay optimizations. We show and discuss the metrics and challenges to antibody validation in chromatin-based assays.

Original languageEnglish (US)
Pages (from-to)1663-1679
Number of pages17
JournalGenome Research
Issue number9
StatePublished - Sep 2021
Externally publishedYes

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics


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