Centrosome defects cause microcephaly by activating the 53BP1-USP28-TP53 mitotic surveillance pathway

EMBO J. 2021 Jan 4;40(1):e106118. doi: 10.15252/embj.2020106118. Epub 2020 Nov 23.


Mutations in centrosome genes deplete neural progenitor cells (NPCs) during brain development, causing microcephaly. While NPC attrition is linked to TP53-mediated cell death in several microcephaly models, how TP53 is activated remains unclear. In cultured cells, mitotic delays resulting from centrosome loss prevent the growth of unfit daughter cells by activating a pathway involving 53BP1, USP28, and TP53, termed the mitotic surveillance pathway. Whether this pathway is active in the developing brain is unknown. Here, we show that the depletion of centrosome proteins in NPCs prolongs mitosis and increases TP53-mediated apoptosis. Cell death after a delayed mitosis was rescued by inactivation of the mitotic surveillance pathway. Moreover, 53BP1 or USP28 deletion restored NPC proliferation and brain size without correcting the upstream centrosome defects or extended mitosis. By contrast, microcephaly caused by the loss of the non-centrosomal protein SMC5 is also TP53-dependent but is not rescued by loss of 53BP1 or USP28. Thus, we propose that mutations in centrosome genes cause microcephaly by delaying mitosis and pathologically activating the mitotic surveillance pathway in the developing brain.

Keywords: DNA damage; TP53 activation; centrosome; microcephaly; mitotic surveillance pathway.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis / genetics
  • Brain / pathology
  • Cell Death / genetics
  • Cell Proliferation / genetics
  • Cells, Cultured
  • Centrosome / metabolism*
  • Mice
  • Mice, Knockout
  • Microcephaly / genetics*
  • Microcephaly / metabolism*
  • Mitosis / genetics*
  • Mutation / genetics
  • Signal Transduction / genetics
  • Tumor Suppressor Protein p53 / genetics*
  • Tumor Suppressor p53-Binding Protein 1 / genetics*
  • Ubiquitin Thiolesterase / genetics*


  • Trp53 protein, mouse
  • Trp53bp1 protein, mouse
  • Tumor Suppressor Protein p53
  • Tumor Suppressor p53-Binding Protein 1
  • USP28 protein, mouse
  • Ubiquitin Thiolesterase