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2017 ; 216
(1
): 247-263
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INPP5E regulates phosphoinositide-dependent cilia transition zone function
#MMPMID27998989
Dyson JM
; Conduit SE
; Feeney SJ
; Hakim S
; DiTommaso T
; Fulcher AJ
; Sriratana A
; Ramm G
; Horan KA
; Gurung R
; Wicking C
; Smyth I
; Mitchell CA
J Cell Biol
2017[Jan]; 216
(1
): 247-263
PMID27998989
show ga
Human ciliopathies, including Joubert syndrome (JBTS), arise from cilia
dysfunction. The inositol polyphosphate 5-phosphatase INPP5E localizes to cilia
and is mutated in JBTS. Murine Inpp5e ablation is embryonically lethal and
recapitulates JBTS, including neural tube defects and polydactyly; however, the
underlying defects in cilia signaling and the function of INPP5E at cilia are
still emerging. We report Inpp5e(-/-) embryos exhibit aberrant Hedgehog-dependent
patterning with reduced Hedgehog signaling. Using mouse genetics, we show
increasing Hedgehog signaling via Smoothened M2 expression rescues some
Inpp5e(-/-) ciliopathy phenotypes and "normalizes" Hedgehog signaling. INPP5E's
phosphoinositide substrates PI(4,5)P(2) and PI(3,4,5)P(3) accumulated at the
transition zone (TZ) in Hedgehog-stimulated Inpp5e(-/-) cells, which was
associated with reduced recruitment of TZ scaffolding proteins and reduced
Smoothened levels at cilia. Expression of wild-type, but not 5-phosphatase-dead,
INPP5E restored TZ molecular organization and Smoothened accumulation at cilia.
Therefore, we identify INPP5E as an essential point of convergence between
Hedgehog and phosphoinositide signaling at cilia that maintains TZ function and
Hedgehog-dependent embryonic development.