Abstract
The centromere—the primary constriction of monocentric chromosomes—is essential for correct segregation of chromosomes during mitosis and meiosis. Centromeric DNA varies between different organisms in sequence composition and extension. The main components of centromeric and pericentromeric DNA of Brassicaceae species are centromeric satellite repeats. Centromeric DNA initiates assembly of the kinetochore, the large protein complex where the spindle fibers attach during nuclear division to pull sister chromatids apart. Kinetochore assembly is initiated by incorporation of the centromeric histone H3 cenH3 into centromeric nucleosomes. The spindle assembly checkpoint acts during mitosis and meiosis at centromeres and maintains genome stability by preventing chromosome segregation before all kinetochores are correctly attached to microtubules. The function of the spindle assembly checkpoint in plants is still poorly understood. Here, we review recent advances of studies on structure and functional importance of centromeric DNA of Brassicaceae, assembly and function of cenH3 in Arabidopsis thaliana and characterization of core SAC proteins of A. thaliana in comparison with non-plant homologues.
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Abbreviations
- APC/C:
-
Anaphase promoting complex/cyclosome
- BiFC:
-
Bimolecular fluorescence complementation
- Bub:
-
Budding uninhibited by benzimidazole
- cenH3:
-
Centromeric histone H3 variant
- CPC:
-
Chromosomal passenger complex
- GFP:
-
Green fluorescent protein
- HFD:
-
Histone fold domain
- HJURP:
-
Holliday junction recognizing protein
- FLIP:
-
Fluorescence loss in photobleaching
- FRAP:
-
Fluorescence recovery after photobleaching
- KNL2:
-
Kinetochore null 2
- LacI:
-
Lac repressor
- LacO:
-
Lac operator
- LTR:
-
Long terminal repeat
- Mad:
-
Mitotic arrest defective
- MMC:
-
Megaspore mother cell
- SAC:
-
Spindle assembly checkpoint
- Scm3:
-
Suppressor of chromosome missegregation 3
- YPF:
-
Yellow fluorescent protein
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Acknowledgments
We thank Ingo Schubert for the critical reading of the article and helpful suggestions and Karin Lipfert for the help with preparation of figures. I.L. is supported by a grant from the Deutsche Forschungsgemeinschaft (LE2299/1-1). D.D. is supported by the DFG (SFB 648).
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Lermontova, I., Sandmann, M. & Demidov, D. Centromeres and kinetochores of Brassicaceae. Chromosome Res 22, 135–152 (2014). https://doi.org/10.1007/s10577-014-9422-z
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DOI: https://doi.org/10.1007/s10577-014-9422-z