Arginine methylation is a common posttranslational modification (PTM), which is catalyzed by a family of nine arginine methyltransferases ? the PRMTs. This PTM has been clearly implicated in a number of cellular processes, including transcriptional regulation. In the context of transcriptional regulation, PRMT4/CARM1 functions as a coactivator with a large number of transcription factors. The mechanisms behind its coactivator functions are unclear. In this grant proposal, we will follow-up on two fundamental discoveries that we made in the past funding cycle: 1) that CARM1 methylates the MED12 component of Mediator and a transcription factor NF1; and 2) that CARM1 overexpression in the mammary gland causes hyperplasia and increased ductal out- growth. These two Aims are linked to each other, as they allow us to characterize two prominent CARM1 substrates in vitro and in cells, and then investigate their importance relaying the CARM1 signal in an in vivo overexpression mouse model. Together, these Aims speak to the overarching goal of this grant, which is ?The Functional Analysis of the Coactivator CARM1?. Our working hypothesis is that when CARM1 is overexpressed in disease states, it promotes cell proliferation by regulating the Mediator complex and NFI transcription factors. A detailed understanding of the spectrum of CARM1 substrates, the ?readers? of CARM1-generated methylation marks, and the examination of physiological defects observed in the CARM1 overexpression mouse models will help us develop a holistic view of the biological roles of this arginine methyltransferase enzyme.

Public Health Relevance

The modification of histones and non-histone proteins by the enzyme CARM1 has been associated with increased transcription rates. Here we plan to study the mechanism by which CARM1 regulates transcription. Because the CARM1 pathway is activated in a number of different diseases, it is an attractive target for drug development, and understanding this pathway in depth will facilitate this targeting.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM126421-15
Application #
9769819
Study Section
Molecular Genetics A Study Section (MGA)
Program Officer
Adkins, Ronald
Project Start
2002-08-01
Project End
2022-08-31
Budget Start
2019-09-01
Budget End
2020-08-31
Support Year
15
Fiscal Year
2019
Total Cost
Indirect Cost
Name
University of Texas MD Anderson Cancer Center
Department
Internal Medicine/Medicine
Type
Overall Medical
DUNS #
800772139
City
Houston
State
TX
Country
United States
Zip Code
77030
Cheng, Donghang; Vemulapalli, Vidyasiri; Lu, Yue et al. (2018) CARM1 methylates MED12 to regulate its RNA-binding ability. Life Sci Alliance 1:e201800117
Bedford, Mark T (2018) Screening for histone codebreakers. J Biol Chem 293:13766-13767
Bao, Jianqiang; Di Lorenzo, Alessandra; Lin, Kevin et al. (2018) Mouse models of overexpression reveal distinct oncogenic roles for different type I protein arginine methyltransferases. Cancer Res :