The human microcephaly protein STIL interacts with CPAP and is required for procentriole formation

Chieh Ju C. Tang, Shin Yi Lin, Wen Bin Hsu, Yi Nan Lin, Chien Ting Wu, Yu Chih Lin, Ching Wen Chang, Kuo Sheng Wu, Tang K. Tang

Research output: Contribution to journalArticlepeer-review

182 Scopus citations


Centriole duplication involves the growth of a procentriole next to the parental centriole. Mutations in STIL and CPAP/CENPJ cause primary microcephaly (MCPH). Here, we show that human STIL has an asymmetric localization to the daughter centriole and is required for procentriole formation. STIL levels oscillate during the cell cycle. Interestingly, STIL interacts directly with CPAP and forms a complex with hSAS6. A natural mutation of CPAP (E1235V) that causes MCPH in humans leads to significantly lower binding to STIL. Overexpression of STIL induced the formation of multiple procentrioles around the parental centriole. STIL depletion inhibited normal centriole duplication, Plk4-induced centriole amplification, and CPAP-induced centriole elongation, and resulted in a failure to localize hSAS6 and CPAP to the base of the nascent procentriole. Furthermore, hSAS6 depletion hindered STIL targeting to the procentriole, implying that STIL and hSAS6 are mutually dependent for their centriolar localization. Together, our results indicate that the two MCPH-associated proteins STIL and CPAP interact with each other and are required for procentriole formation, implying a central role of centriole biogenesis in MCPH.

Original languageEnglish (US)
Pages (from-to)4790-4804
Number of pages15
JournalEMBO Journal
Issue number23
StatePublished - Nov 30 2011
Externally publishedYes


  • Biogenesis
  • Cell cycle
  • Centrosome duplication
  • MCPH
  • Microcephaly
  • Procentriole formation

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)


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