NDLI: Live Cell Imaging of the Cancer-related Transcription Factor RUNX2 during Mitotic Progression

Content Provider	PubMed Central
Author	Pockwinse, Shirwin M. Kota, Krishna P. Quaresma, Alexandre J. C. Imbalzano, Anthony N. Lian, Jane B. Wijnen, Andre J. Van Stein, Janet L. Stein, Gary S. Nickerson, Jeffrey A.
Abstract	The nuclear matrix bound transcription factor RUNX2 is a lineage-specific developmental regulator that is linked to cancer. We have previously shown that RUNX2 controls transcription of both RNA polymerase II genes and RNA polymerase I dependent ribosomal RNA genes. RUNX2 is epigenetically retained through mitosis on both classes of target genes in condensed chromosomes. We have used fluorescence recovery after photobleaching (FRAP) to measure the relative binding kinetics of EGFP-RUNX2 at transcription sites in the nucleus and nucleoli during interphase, as well as on mitotic chromosomes. RUNX2 becomes more strongly bound as cells go from interphase through prophase, with a doubling of the most tightly bound “immobile fraction”. RUNX2 exchange then becomes much more facile during metaphase to telophase. During interphase the less tightly bound pool of RUNX2 exchanges more slowly at nucleoli than at subnuclear foci, and the non-exchanging immobile fraction is greater in nucleoli. These results are consistent with a model in which the molecular mechanism of RUNX2 binding is different at protein-coding and ribosomal RNA genes. The binding interactions of RUNX2 change as cells go through mitosis, with binding affinity increasing as chromosomes condense and then decreasing through subsequent mitotic phases. The increased residence of RUNX2 at mitotic chromosomes may reflect its epigenetic function in “bookmarking” of target genes in cancer cells.
Related Links	http://dx.doi.org/10.1002/jcp.22465
Ending Page	1389
Page Count	7
Starting Page	1383
File Format	PDF
ISSN	00219541
e-ISSN	10974652
Journal	Journal of cellular physiology
Issue Number	5
Volume Number	226
Language	English
Publisher Date	2011-05-01
Access Restriction	Open
Subject Keyword	Clinical Biochemistry Cell Biology Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Physiology Clinical Biochemistry

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