Content area

Abstract

Gaps persist in our understanding of chromatin lower- and higher-order structures. Xenopus egg extracts provide a way to study essential chromatin components which are difficult to manipulate in living cells, but nanoscale imaging of chromatin assembled in extracts poses a challenge. We describe a method for preparing chromatin assembled in extracts for atomic force microscopy (AFM) utilizing restriction enzyme digestion followed by transferring to a mica surface. Using this method, we find that buffer dilution of the chromatin assembly extract or incubation of chromatin in solutions of low ionic strength results in loosely compacted chromatin fibers that are prone to unraveling into naked DNA. We also describe a method for direct AFM imaging of chromatin which does not utilize restriction enzymes and reveals higher-order fibers of varying widths. Due to the capability of controlling chromatin assembly conditions, we believe these methods have broad potential for studying physiologically relevant chromatin structures.[PUBLICATION ABSTRACT]

Details

Title
Atomic force microscope imaging of chromatin assembled in Xenopus laevis egg extract
Publication title
Chromosoma; Heidelberg
Volume
120
Issue
3
Pages
245-54
Publication year
2011
Publication date
Jun 2011
Publisher
Springer Nature B.V.
Place of publication
Heidelberg
Country of publication
Netherlands
Publication subject
ISSN
00095915
e-ISSN
14320886
Source type
Scholarly Journal
Language of publication
English
Document type
Feature, Journal Article
Accession number
21369955
ProQuest document ID
867884034
Document URL
https://www.proquest.com/scholarly-journals/atomic-force-microscope-imaging-chromatin/docview/867884034/se-2?accountid=208611
Copyright
Springer-Verlag 2011
Last updated
2023-11-22
Database
ProQuest One Academic