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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Biol
2016 ; 215
(5
): 631-647
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GTSE1 tunes microtubule stability for chromosome alignment and segregation by
inhibiting the microtubule depolymerase MCAK
#MMPMID27881713
Bendre S
; Rondelet A
; Hall C
; Schmidt N
; Lin YC
; Brouhard GJ
; Bird AW
J Cell Biol
2016[Dec]; 215
(5
): 631-647
PMID27881713
show ga
The dynamic regulation of microtubules (MTs) during mitosis is critical for
accurate chromosome segregation and genome stability. Cancer cell lines with
hyperstabilized kinetochore MTs have increased segregation errors and elevated
chromosomal instability (CIN), but the genetic defects responsible remain largely
unknown. The MT depolymerase MCAK (mitotic centromere-associated kinesin) can
influence CIN through its impact on MT stability, but how its potent activity is
controlled in cells remains unclear. In this study, we show that GTSE1, a protein
found overexpressed in aneuploid cancer cell lines and tumors, regulates MT
stability during mitosis by inhibiting MCAK MT depolymerase activity. Cells
lacking GTSE1 have defects in chromosome alignment and spindle positioning as a
result of MT instability caused by excess MCAK activity. Reducing GTSE1 levels in
CIN cancer cell lines reduces chromosome missegregation defects, whereas
artificially inducing GTSE1 levels in chromosomally stable cells elevates
chromosome missegregation and CIN. Thus, GTSE1 inhibition of MCAK activity
regulates the balance of MT stability that determines the fidelity of chromosome
alignment, segregation, and chromosomal stability.