The actin family member Arp6 and the histone variant H2A.Z are required for spatial positioning of chromatin in chicken cell nuclei

0387825 - ÚMG 2013 RIV GB eng J - Journal Article
Maruyama, E.O. - Hori, T. - Tanabe, H. - Kitamura, H. - Matsuda, R. - Tone, S. - Hozák, Pavel - Habermann, F.A. - von Hase, J. - Cremer, C. - Fukagawa, T. - Harata, M.
The actin family member Arp6 and the histone variant H2A.Z are required for spatial positioning of chromatin in chicken cell nuclei.
Journal of Cell Science. Roč. 125, č. 16 (2012), s. 3739-3744. ISSN 0021-9533. E-ISSN 1477-9137
R&D Projects: GA MŠMT LC545; GA MŠMT LH12143
Institutional support: RVO:68378050
Keywords : actin-related protein * histone variant * nuclear organization
Subject RIV: EB - Genetics ; Molecular Biology
Impact factor: 5.877, year: 2012

The spatial organization of chromatin in the nucleus contributes to genome function and is altered during the differentiation of normal and tumorigenic cells. Although nuclear actin-related proteins (Arps) have roles in the local alteration of chromatin structure, it is unclear whether they are involved in the spatial positioning of chromatin. In the interphase nucleus of vertebrate cells, gene-dense and gene-poor chromosome territories (CTs) are located in the center and periphery, respectively. We analyzed chicken DT40 cells in which Arp6 had been knocked out conditionally, and showed that the radial distribution of CTs was impaired in these knockout cells. Arp6 is an essential component of the SRCAP chromatin remodeling complex, which deposits the histone variant H2A.Z into chromatin. The redistribution of CTs was also observed in H2A. Z-deficient cells for gene-rich microchromosomes, but to lesser extent for gene-poor macrochromosomes. These results indicate that Arp6 and H2A.Z contribute to the radial distribution of CTs through different mechanisms. Microarray analysis suggested that the localization of chromatin to the nuclear periphery per se is insufficient for the repression of most genes.
Permanent Link: http://hdl.handle.net/11104/0218626