期刊
JOURNAL OF CELL BIOLOGY
卷 216, 期 1, 页码 247-263出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.201511055
关键词
-
类别
资金
- National Health and Medical Research Council of Australia [APP1046174]
- National Health and Medical Research Council
- University of Queensland Vice Chancellor's Senior Research Fellowships
- Australian Postgraduate award
- Cancer Council Victoria Postgraduate Cancer Research Scholarship
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据