Tektin 2 is required for central spindle microtubule organization and the completion of cytokinesis

Thomas M. Durcan, Elizabeth S. Halpin, Trisha Rao, Nicholas S. Collins, Emily K. Tribble, Jessica E. Hornick, Edward H. Hinchcliffe

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

During anaphase, the nonkinetochore microtubules in the spindle midzone become compacted into the central spindle, a structure which is required to both initiate and complete cytokinesis. We show that Tektin 2 (Tek2) associates with the spindle poles throughout mitosis, organizes the spindle midzone microtubules during anaphase, and assembles into the midbody matrix surrounding the compacted midzone microtubules during cytokinesis. Tek2 small interfering RNA (siRNA) disrupts central spindle organization and proper localization of MKLP1, PRC1, and Aurora B to the midzone and prevents the formation of a midbody matrix. Video microscopy revealed that loss of Tek2 results in binucleate cell formation by aberrant fusion of daughter cells after cytokinesis. Although a myosin II inhibitor, blebbistatin, prevents actin-myosin contractility, the microtubules of the central spindle are compacted. Strikingly, Tek2 siRNA abolishes this actin-myosin - independent midzone microtubule compaction. Thus, Tek2-dependent organization of the central spindle during anaphase is essential for proper midbody formation and the segregation of daughter cells after cytokinesis.

Original languageEnglish (US)
Pages (from-to)595-603
Number of pages9
JournalJournal of Cell Biology
Volume181
Issue number4
DOIs
StatePublished - May 19 2008
Externally publishedYes

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