Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 35, Pages E5135-E5143Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1604258113
Keywords
transition zone; cilium/flagellum; BBSome; MKS/B9 complex; trypanosome
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Funding
- Sir Henry Wellcome Fellowship [092201/Z/10/Z]
- Wellcome Trust [WT066839MA, 104627/Z/14/Z]
- Wellcome Trust [092201/Z/10/Z, 104627/Z/14/Z] Funding Source: Wellcome Trust
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The transition zone (TZ) of eukaryotic cilia and flagella is a structural intermediate between the basal body and the axoneme that regulates ciliary traffic. Mutations in genes encoding TZ proteins (TZPs) cause human inherited diseases (ciliopathies). Here, we use the trypanosome to identify TZ components and localize them to TZ subdomains, showing that the Bardet-Biedl syndrome complex (BBSome) is more distal in the TZ than the Meckel syndrome (MKS) complex. Several of the TZPs identified here have human orthologs. Functional analysis shows essential roles for TZPs in motility, in building the axoneme central pair apparatus and in flagellum biogenesis. Analysis using RNAi and HaloTag fusion protein approaches reveals that most TZPs (including the MKS ciliopathy complex) show long-term stable association with the TZ, whereas the BBSome is dynamic. We propose that some Bardet-Biedl syndrome and MKS pleiotropy may be caused by mutations that impact TZP complex dynamics.
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