This application builds upon substantial advances in the last period that uncovered a unique chromatin structure of yeast heterochromatin, developed a powerful new assay capable of detecting transient lapses in heterochromatin function, and overturned multiple widely-held views of silenced chromatin. This new assay opened the window to studies of the dynamics of heterochromatin that have previously been elusive. In the upcoming period, five specific aims will address the most important unresolved issues regarding the structure, stability and epigenetic inheritance of silenced chromatin, and reveal what happens to its silencing capacity when it serves as a donor for double-strand break repair. First, the PI and his team will integrate results from their earlier studies of cell- cycle stages in the assembly of silenced chromatin with their high-resolution chromatin mapping and determine which features of the final structure accompany each stage of its assembly and maturation. Second, they will continue a very promising test of whether nucleosomes are carriers of the epigenetic information for the inheritance of silenced chromatin, testing first how the inheritance of silenced chromatin is influenced by the size of the silenced domain. Third, they propose ground-breaking experiments to address the fundamental questions of all chromatin-based epigenetic inheritance by developing broadly applicable technology to map the DNA positions of individual nucleosomes and the proteins that bind them through a round of DNA replication. Forth, they integrate their experience with microfluidics to study at the single-cell level how various proteins functioning at or near the replication fork impact the establishment, maintenance and inheritance of silenced chromatin. Finally, they address the enigma of how silenced chromatin retains its silencing capacity in the face of the molecular invasions accompanying its role as a donor in double-strand break repair. The most proximal health relatedness of this work lies in the growing recognition of the importance of epigenetic processes in cancer. In addition much of development is, by definition, based upon epigenetic processes. Hence the work is highly relevant to many defects in developmental processes.

Public Health Relevance

Epigenetic silencing of genes is increasingly recognized as a mechanism used by certain cancers to evolve into ever more aggressive forms. The pathogens behind diseases like malaria and sleeping sickness use epigenetic gene silencing mechanisms to evade the immune system. Learning enough about epigenetic gene silencing mechanisms may reveal ways in which they can be subverted, and thus aid in the treatment of a wide range of disease.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM031105-39
Application #
9982367
Study Section
Molecular Genetics A Study Section (MGA)
Program Officer
Carter, Anthony D
Project Start
1982-07-01
Project End
2021-07-31
Budget Start
2020-08-01
Budget End
2021-07-31
Support Year
39
Fiscal Year
2020
Total Cost
Indirect Cost
Name
University of California Berkeley
Department
Miscellaneous
Type
Organized Research Units
DUNS #
124726725
City
Berkeley
State
CA
Country
United States
Zip Code
94710
Sieverman, Kathryn J; Rine, Jasper (2018) Impact of Homologous Recombination on Silent Chromatin in Saccharomyces cerevisiae. Genetics 208:1099-1113
Janke, Ryan; King, Grant A; Kupiec, Martin et al. (2018) Pivotal roles of PCNA loading and unloading in heterochromatin function. Proc Natl Acad Sci U S A 115:E2030-E2039
Schlissel, Gavin; Krzyzanowski, Marek K; Caudron, Fabrice et al. (2017) Aggregation of the Whi3 protein, not loss of heterochromatin, causes sterility in old yeast cells. Science 355:1184-1187
Janke, Ryan; Iavarone, Anthony T; Rine, Jasper (2017) Oncometabolite D-2-Hydroxyglutarate enhances gene silencing through inhibition of specific H3K36 histone demethylases. Elife 6:
McCleary, David F; Rine, Jasper (2017) Nutritional Control of Chronological Aging and Heterochromatin in Saccharomyces cerevisiae. Genetics 205:1179-1193
Dodson, Anne E; Rine, Jasper (2016) Donor Preference Meets Heterochromatin: Moonlighting Activities of a Recombinational Enhancer in Saccharomyces cerevisiae. Genetics 204:1065-1074
Ellahi, Aisha; Rine, Jasper (2016) Evolution and Functional Trajectory of Sir1 in Gene Silencing. Mol Cell Biol 36:1164-79
McCleary, David F; Steakley, David Lee; Rine, Jasper (2016) Sir protein-independent repair of dicentric chromosomes in Saccharomyces cerevisiae. Mol Biol Cell 27:2879-83
Liu, Tzu-Yu; Dodson, Anne E; Terhorst, Jonathan et al. (2016) Riches of phenotype computationally extracted from microbial colonies. Proc Natl Acad Sci U S A 113:E2822-31
Steakley, David Lee; Rine, Jasper (2015) On the Mechanism of Gene Silencing in Saccharomyces cerevisiae. G3 (Bethesda) 5:1751-63

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