GSBS Student Publications
Title
Mitotic partitioning and selective reorganization of tissue-specific transcription factors in progeny cells
Publication Date
2003-12-06
UMMS Affiliation
Department of Cell Biology; Graduate School of Biomedical Sciences
Document Type
Article
Disciplines
Life Sciences | Medicine and Health Sciences
Abstract
Postmitotic gene expression requires restoration of nuclear organization and assembly of regulatory complexes. The hematopoietic and osteogenic Runx (Cbfa/AML) transcription factors are punctately organized in the interphase nucleus and provide a model for understanding the subnuclear organization of tissue-specific regulatory proteins after mitosis. Here we have used quantitative in situ immunofluorescence microscopy and quantitative image analysis to show that Runx factors undergo progressive changes in cellular localization during mitosis while retaining a punctate distribution. In comparison, the acetyl transferase p300 and acetylated histone H4 remain localized with DNA throughout mitosis while the RNA processing factor SC35 is excluded from mitotic chromatin. Subnuclear organization of Runx foci is completely restored in telophase, and Runx proteins are equally partitioned into progeny nuclei. In contrast, subnuclear organization of SC35 is restored subsequent to telophase. Our results show a sequential reorganization of Runx and its coregulatory proteins that precedes restoration of RNA processing speckles. Thus, mitotic partitioning and spatiotemporal reorganization of regulatory proteins together render progeny cells equivalently competent to support phenotypic gene expression.
DOI of Published Version
10.1073/pnas.2533076100
Source
Proc Natl Acad Sci U S A. 2003 Dec 9;100(25):14852-7. Epub 2003 Dec 1. Link to article on publisher's site
Journal/Book/Conference Title
Proceedings of the National Academy of Sciences of the United States of America
Related Resources
PubMed ID
14657346
Repository Citation
Zaidi, Sayyed K.; Young, Daniel W.; Pockwinse, Shirwin M.; Javed, Amjad; Lian, Jane B.; Stein, Janet L.; Van Wijnen, Andre J.; and Stein, Gary S., "Mitotic partitioning and selective reorganization of tissue-specific transcription factors in progeny cells" (2003). GSBS Student Publications. 714.
https://escholarship.umassmed.edu/gsbs_sp/714