This proposal is aimed at developing tools and techniques to image single cells at high resolution and reveals the role of epigenetic machinery in chromatin architecture regulation in vivo. Epigenetically regulated changes in chromatin organization are a fundamental component of gene regulation. While a multitude of protein players and epigenetic marks are known, how each of these factors affects chromatin structure is not fully understood, particularly in the context of development. This proposal will examine two epigenetically regulated systems of mammalian chromatin organization, olfactory receptor gene choice and X chromosome inactivation, utilizing a novel, high resolution imaging technique, called soft X-Ray tomography (SXT). SXT allows examination of intact, unfixed and unstained cells to a resolution level similar to electron microscopy. This powerful imaging system, which captures "native" chromatin architecture, will be employed in combination with innovative labeling approaches and sophisticated genetic and epigenetic manipulations to reveal the molecular underpinnings of higher order chromatin architecture and the 3-dimensional organization of the mammalian nucleus. Because both olfactory gene choice and X-inactivation are examples of developmentally regulated epigenetic gene regulation that are experimentally tractable, this approach will provide significant understanding to the regulatory logic of these two essential processes.

Public Health Relevance

Disruption of nuclear architecture is associated with human diseases and disorders ranging from progeria to Rett syndrome to cancer. Thus, understanding the structural principles of higher order chromatin packaging and the organizational logic by which chromatin is arranged in the 3-dimensional nuclear space is relevant to a variety of disease processes. This proposal will combine high resolution microscopy and manipulation of epigenetic machinery to dissect the spatial organization of the mammalian nucleus and to investigate the molecular mechanisms that regulate this organization.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
1F32GM099389-01A1
Application #
8315662
Study Section
Special Emphasis Panel (ZRG1-F05-P (20))
Program Officer
Reddy, Michael K
Project Start
2012-04-01
Project End
2014-03-31
Budget Start
2012-04-01
Budget End
2013-03-31
Support Year
1
Fiscal Year
2012
Total Cost
$51,455
Indirect Cost
Name
University of California San Francisco
Department
Anatomy/Cell Biology
Type
Schools of Medicine
DUNS #
094878337
City
San Francisco
State
CA
Country
United States
Zip Code
94143