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SAF-A/hnRNP-U localization in interphase and metaphase.

A S Kukalev¹, I B Lobov, P Percipalle

¹Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia.

Cytogenetic and Genome Research

|June 27, 2009

Summary

Nuclear protein SAF-A/hnRNP U binds MAR DNA and satellite DNA. It localizes to chromosome arms and centromeres, revealing its diverse functions in nuclear organization during cell division.

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Area of Science:

Molecular and Cellular Biology
Chromatin Biology
Biochemistry

Background:

SAF-A/hnRNP U is a nuclear protein known to bind DNA and RNA.
Its interaction with nuclear matrix attachment regions (MARs) and satellite DNA (satMa) suggests a role in genome organization.

Purpose of the Study:

To investigate the precise localization of SAF-A/hnRNP U within the nucleus.
To correlate its binding specificities with its cellular distribution.
To understand the functional significance of its domains in nuclear architecture.

Main Methods:

Immunofluorescence using antibodies against SAF-A.
Localization studies using GFP-fusion constructs of SAF-A/hnRNP U.
Analysis of SAF-A distribution in interphase and telophase cells.

Main Results:

SAF-A/hnRNP U localizes to three distinct nuclear domains: outside chromosomes, on chromosome arms (likely MARs), and in the centromere region.
Centromeric localization is specifically associated with binding to mouse major satellite DNA (satMa).
Functional domains of SAF-A/hnRNP U are crucial for its localization and function in interphase cells.
During telophase, SAF-A forms a network covering decondensed chromosomes.

Conclusions:

SAF-A/hnRNP U plays a significant role in nuclear organization through its specific DNA binding properties.
Its localization to MARs and centromeric satellite DNA highlights its involvement in higher-order chromatin structure.
The protein's domain structure dictates its function in maintaining nuclear architecture across the cell cycle.