The CENP-O complex requirement varies among different cell types

Naoko Kagawa, Tetsuya Hori, Yuko Hoki, Osamu Hosoya, Kimiko Tsutsui, Yumiko Saga, Takashi Sado, Tatsuo Fukagawa

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


CENP-U (CENP-50) is a component of the CENP-O complex, which includes CENP-O, CENP-P, CENP-Q, CENP-R, and CENP-U and is constitutively localized at kinetochores throughout the cell cycle in vertebrates. Although CENP-U deficiency results in some mitotic defects in chicken DT40 cells, CENP-U-deficient chicken DT40 cells are viable. To examine the functional roles of CENP-U in an organism-dependent context, we generated CENP-U-deficient mice. The CENP-U-deficient mice died during early embryogenesis (approximately E7.5). Thus, conditional CENP-U-deficient mouse ES cells were generated to analyze CENP-U-deficient phenotypes at the cell level. When CENP-U was disrupted in the mouse ES cells, all CENP-O complex proteins disappeared from kinetochores. In contrast, other kinetochore proteins were recruited in CENP-U-deficient mouse ES cells as CENP-U-deficient DT40 cells. However, the CENP-U-deficient ES cells died after exhibiting abnormal mitotic behavior. Although CENP-U was essential for cell viability during mouse early embryogenesis, CENP-U-deficient mouse embryonic fibroblast cells were viable, similar to the DT40 cells. Thus, although both DT40 and ES cells with CENP-U deficiency have similar mitotic defects, cellular responses to mitotic defects vary among different cell types.

Original languageEnglish
Pages (from-to)293-303
Number of pages11
JournalChromosome Research
Issue number3
Publication statusPublished - Sept 2014


  • CENP-O complex proteins
  • Centromere
  • Kinetochore

ASJC Scopus subject areas

  • Genetics


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