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2014 ; 33
(19
): 2247-60
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English Wikipedia
Tubulin glycylases are required for primary cilia, control of cell proliferation
and tumor development in colon
#MMPMID25180231
Rocha C
; Papon L
; Cacheux W
; Marques Sousa P
; Lascano V
; Tort O
; Giordano T
; Vacher S
; Lemmers B
; Mariani P
; Meseure D
; Medema JP
; Bièche I
; Hahne M
; Janke C
EMBO J
2014[Oct]; 33
(19
): 2247-60
PMID25180231
show ga
TTLL3 and TTLL8 are tubulin glycine ligases catalyzing posttranslational
glycylation of microtubules. We show here for the first time that these enzymes
are required for robust formation of primary cilia. We further discover the
existence of primary cilia in colon and demonstrate that TTLL3 is the only
glycylase in this organ. As a consequence, colon epithelium shows a reduced
number of primary cilia accompanied by an increased rate of cell division in
TTLL3-knockout mice. Strikingly, higher proliferation is compensated by faster
tissue turnover in normal colon. In a mouse model for tumorigenesis, lack of
TTLL3 strongly promotes tumor development. We further demonstrate that decreased
levels of TTLL3 expression are linked to the development of human colorectal
carcinomas. Thus, we have uncovered a novel role for tubulin glycylation in
primary cilia maintenance, which controls cell proliferation of colon epithelial
cells and plays an essential role in colon cancer development.