Unidad de Investigación, Hospital Universitario Nuestra Señora de Candelaria, Santa Cruz de Tenerife, 38010, Spain.
Instituto de Tecnologías Biomédicas, Universidad de La Laguna, Santa Cruz de Tenerife, 38200, Spain.
Bioessays. 2020 Jul;42(7):e2000021. doi: 10.1002/bies.202000021. Epub 2020 May 4.
It has been recently demonstrated that yeast cells are able to partially regress chromosome segregation in telophase as a response to DNA double-strand breaks (DSBs), likely to find a donor sequence for homology-directed repair (HDR). This regression challenges the traditional concept that establishes anaphase events as irreversible, hence opening a new field of research in cell biology. Here, the nature of this new behavior in yeast is summarized and the underlying mechanisms are speculated about. It is also discussed whether it can be reproduced in other eukaryotes. Overall, this work brings forwards the need of understanding how cells attempt to repair DSBs when transiting the latest stages of mitosis, i.e., anaphase and telophase.
最近有研究表明,酵母细胞在有丝分裂末期可以部分逆转染色体分离,以响应 DNA 双链断裂(DSBs),从而找到同源定向修复(HDR)的供体序列。这种逆转挑战了传统的后期事件不可逆的概念,为细胞生物学的一个新研究领域开辟了道路。在这里,总结了酵母中这种新行为的本质,并推测了其潜在的机制。还讨论了它是否可以在其他真核生物中重现。总的来说,这项工作提出了需要理解细胞在经历有丝分裂的最后阶段,即后期和末期时,如何尝试修复 DSBs 的问题。
Genes Chromosomes Cancer. 2007-6
Bioessays. 2020-7
Cytogenet Genome Res. 2004