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• W103636450 abstract "DNA topoisomerase II (topo II) plays a crucial role in controlling the conformation of both DNA and whole chromosomes. This activity is essential for several cellular events such as DNA replication, transcription, chromosome condensation and segregation. In mammals, two genes code for isoforms of topo II, termed alpha and beta. They are similar in primary structure and have almost identical catalytic properties in vitro. We transfected HeLa cells with small interfering RNAs (siRNAs) targeted against either topo IIalpha or IIbeta, and succeeded in knocking down the expression of the corresponding protein. Chromosomes were condensed and aligned at metaphase in topo IIalpha-knockdown cells. Although some lagging chromosomes were observed, they were still segregated at anaphase despite the absence of topo IIalpha. When both topo IIalpha and topo IIbeta were removed, the segregation of chromosomes was severely arrested, suggesting that topo IIbeta could partially substitute for topo IIalpha. Double-knockdown experiments also revealed that topo II was required for shortening of the chromosome axis." @default.
• W103636450 created "2016-06-24" @default.
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• W103636450 date "2004-03-01" @default.
• W103636450 modified "2023-09-27" @default.
• W103636450 title "Functional compatibility between isoform α and β of type II DNA topoisomerase" @default.
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• W103636450 doi "https://doi.org/10.1242/jcs.00977" @default.
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