Abstract
Mutations in the PHIP/BRWD2 chromatin regulator cause the human neurodevelopmental disorder Chung-Jansen syndrome, while alterations in PHIP expression are linked to cancer. Precisely how PHIP functions in these contexts is not fully understood. Here we demonstrate that PHIP is a chromatin-associated CRL4 ubiquitin ligase substrate receptor and is required for CRL4 recruitment to chromatin. PHIP binds to chromatin through a trivalent reader domain consisting of a H3K4-methyl binding Tudor domain and two bromodomains (BD1 and BD2). Using semisynthetic nucleosomes with defined histone post-translational modifications, we characterize PHIPs BD1 and BD2 as respective readers of H3K14ac and H4K12ac, and identify human disease-associated mutations in each domain and the intervening linker region that likely disrupt chromatin binding. These findings provide new insight into the biological function of this enigmatic chromatin protein and set the stage for the identification of both upstream chromatin modifiers and downstream targets of PHIP in human disease.
Original language | English (US) |
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Pages (from-to) | 1642-1656 |
Number of pages | 15 |
Journal | Genes and Development |
Volume | 35 |
Issue number | 23-24 |
DOIs | |
State | Published - Dec 1 2021 |
Funding
Research in the Shilatifard laboratory is supported by National Institutes of Health (NIH) grant R35CA197569. Research at EpiCy-pher, Inc., is supported by NIH grants 2R44GM117683, 2R44CA214076, and 2R44GM116584. Research in the Rothbart laboratory is supported by NIH grant R35GM124736. R.M.V. is supported by NIH fellowship F99CA245821 from the National Cancer Institute. We thank colleagues for the kind supply of reagents (see the Material and Methods), Jeffrey N. Savas for expertise and advice in mass spectrometry analysis, Nabiha Khan for next-generation sequencing library preparation, Siddhartha Das for bioinformatics analysis, and Sanjukta Guha Thakurta for TMT MS instrumentation and analysis.
Keywords
- Chromatin
- Histone
- Neurodevelopmental disorder
- Neuroepigenetics
ASJC Scopus subject areas
- Genetics
- Developmental Biology