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2015 ; 34
(8
): 1078-89
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Cyclin O (Ccno) functions during deuterosome-mediated centriole amplification of
multiciliated cells
#MMPMID25712475
Funk MC
; Bera AN
; Menchen T
; Kuales G
; Thriene K
; Lienkamp SS
; Dengjel J
; Omran H
; Frank M
; Arnold SJ
EMBO J
2015[Apr]; 34
(8
): 1078-89
PMID25712475
show ga
Mucociliary clearance and fluid transport along epithelial surfaces are carried
out by multiciliated cells (MCCs). Recently, human mutations in Cyclin O (CCNO)
were linked to severe airway disease. Here, we show that Ccno expression is
restricted to MCCs and the genetic deletion of Ccno in mouse leads to reduced
numbers of multiple motile cilia and characteristic phenotypes of MCC dysfunction
including severe hydrocephalus and mucociliary clearance deficits. Reduced cilia
numbers are caused by compromised generation of centrioles at deuterosomes, which
serve as major amplification platform for centrioles in MCCs. Ccno-deficient MCCs
fail to sufficiently generate deuterosomes, and only reduced numbers of fully
functional centrioles that undergo maturation to ciliary basal bodies are formed.
Collectively, this study implicates CCNO as first known regulator of deuterosome
formation and function for the amplification of centrioles in MCCs.