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Supplementary Figure from Systematic Profiling of DNMT3A Variants Reveals Protein Instability Mediated by the DCAF8 E3 Ubiquitin Ligase Adaptor

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posted on 2023-04-03, 23:40 authored by Yung-Hsin Huang, Chun-Wei Chen, Venkatasubramaniam Sundaramurthy, Mikołaj Słabicki, Dapeng Hao, Caroline J. Watson, Ayala Tovy, Jaime M. Reyes, Olga Dakhova, Brielle R. Crovetti, Christina Galonska, Minjung Lee, Lorenzo Brunetti, Yubin Zhou, Katrina Tatton-Brown, Yun Huang, Xiaodong Cheng, Alexander Meissner, Peter J.M. Valk, Lionel Van Maldergem, Mathijs A. Sanders, Jamie R. Blundell, Wei Li, Benjamin L. Ebert, Margaret A. Goodell
Supplementary Figure from Systematic Profiling of DNMT3A Variants Reveals Protein Instability Mediated by the DCAF8 E3 Ubiquitin Ligase Adaptor

Funding

Cancer Prevention and Research Institute of Texas

Edward P. Evans Foundation

Samuel Waxman Cancer Research Foundation

Welch Foundation

American Cancer Society

National Institutes of Health

Genetically Engineered Mouse Core at BCM

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ARTICLE ABSTRACT

Clonal hematopoiesis is a prevalent age-related condition associated with a greatly increased risk of hematologic disease; mutations in DNA methyltransferase 3A (DNMT3A) are the most common driver of this state. DNMT3A variants occur across the gene with some particularly associated with malignancy, but the functional relevance and mechanisms of pathogenesis of the majority of mutations are unknown. Here, we systematically investigated the methyltransferase activity and protein stability of 253 disease-associated DNMT3A mutations, and found that 74% were loss-of-function mutations. Half of these variants exhibited reduced protein stability and, as a class, correlated with greater clonal expansion and acute myeloid leukemia development. We investigated the mechanisms underlying the instability using a CRISPR screen and uncovered regulated destruction of DNMT3A mediated by the DCAF8 E3 ubiquitin ligase adaptor. We establish a new paradigm to classify novel variants that has prognostic and potential therapeutic significance for patients with hematologic disease. DNMT3A has emerged as the most important epigenetic regulator and tumor suppressor in the hematopoietic system. Our study represents a systematic and high-throughput method to characterize the molecular impact of DNMT3A missense mutations and the discovery of a regulated destruction mechanism of DNMT3A offering new prognostic and future therapeutic avenues.See related commentary by Ma and Will, p. 23.This article is highlighted in the In This Issue feature, p. 1

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