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Non-Rabl chromosome organization in endoreduplicated nuclei of barley embryo and endosperm tissues
Non-Rabl chromosome organization in endoreduplicated nuclei of barley embryo and endosperm tissues
Authors
Nowicka, A., Ferková, L., Said, M., Kovačik, M., Zwyrtková, J., Baroux, C., Pečinka, A.
Year
2023
Journal
Journal of Experimental Botany
Volume
74
Pages
2527-2541
DOI
10.1093/jxb/erad036
Abstract
Rabl organization is a type of interphase chromosome arrangement with centromeres and telomeres clustering at opposite nuclear poles. Here, we analyzed nuclear morphology and chromosome organization in cycling and endoreduplicated nuclei isolated from embryo and endosperm tissues of developing barley seeds. We show that endoreduplicated nuclei have an irregular shape, less sister chromatid cohesion at 5S rDNA loci, and a reduced amount of centromeric histone CENH3. While the chromosomes of the embryo and endosperm nuclei are initially organized in Rabl configuration, the centromeres and telomeres are intermingled within the nuclear space in the endoreduplicated nuclei with an increasing endoreduplication level. Such a loss of chromosome organization suggests that Rabl configuration is introduced and further reinforced by mitotic divisions in barley cell nuclei in a tissue- and seed agedependent manner.