Abstract：
:The binding of Hedgehog (Hh) to its receptor Patched causes derepression of Smoothened (Smo), resulting in the activation of the Hh pathway. Here, we show that Smo activation is dependent on the levels of the phospholipid phosphatidylinositol-4 phosphate (PI4P). Loss of STT4 kinase, which is required for the generation of PI4P, exhibits hh loss-of-function phenotypes, whereas loss of Sac1 phosphatase, which is required for the degradation of PI4P, results in hh gain-of-function phenotypes in multiple settings during Drosophila development. Furthermore, loss of Ptc function, which results in the activation of Hh pathway, also causes an increase in PI4P levels. Sac1 functions downstream of STT4 and Ptc in the regulation of Smo membrane localization and Hh pathway activation. Taken together, our results suggest a model in which Ptc directly or indirectly functions to suppress the accumulation of PI4P. Binding of Hh to Ptc derepresses the levels of PI4P, which, in turn, promotes Smo activation.
journal_name
Dev Celljournal_title
Developmental cellauthors
Yavari A,Nagaraj R,Owusu-Ansah E,Folick A,Ngo K,Hillman T,Call G,Rohatgi R,Scott MP,Banerjee Udoi
10.1016/j.devcel.2010.06.007subject
Has Abstractpub_date
2010-07-20 00:00:00pages
54-65issue
1eissn
1534-5807issn
1878-1551pii
S1534-5807(10)00297-2journal_volume
19pub_type
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