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Live imaging of hair bundle polarity acquisition demonstrates a critical timeline for transcription factor Emx2.
- Source :
-
ELife [Elife] 2020 Sep 23; Vol. 9. Date of Electronic Publication: 2020 Sep 23. - Publication Year :
- 2020
-
Abstract
- Directional sensitivity of hair cells (HCs) is conferred by the aymmetric apical hair bundle, comprised of a kinocilium and stereocilia staircase. The mother centriole (MC) forms the base of the kinocilium and the stereocilia develop adjacent to it. Previously, we showed that transcription factor Emx2 reverses hair bundle orientation and its expression in the mouse vestibular utricle is restricted, resulting in two regions of opposite bundle orientation (Jiang et al., 2017). Here, we investigated establishment of opposite bundle orientation in embryonic utricles by live-imaging GFP-labeled centrioles in HCs. The daughter centriole invariably migrated ahead of the MC from the center to their respective peripheral locations in HCs. Comparing HCs between utricular regions, centriole trajectories were similar but they migrated toward opposite directions, suggesting that Emx2 pre-patterned HCs prior to centriole migration. Ectopic Emx2 , however, reversed centriole trajectory within hours during a critical time-window when centriole trajectory was responsive to Emx2.<br />Competing Interests: YT No competing interests declared, DW Reviewing editor, eLife
- Subjects :
- Animals
Centrioles metabolism
Cilia metabolism
Female
Homeodomain Proteins genetics
Male
Mice
Mice, Knockout
Microscopy
Transcription Factors genetics
Cell Polarity physiology
Hair Cells, Auditory cytology
Hair Cells, Auditory metabolism
Homeodomain Proteins metabolism
Saccule and Utricle cytology
Saccule and Utricle diagnostic imaging
Saccule and Utricle metabolism
Transcription Factors metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 2050-084X
- Volume :
- 9
- Database :
- MEDLINE
- Journal :
- ELife
- Publication Type :
- Academic Journal
- Accession number :
- 32965215
- Full Text :
- https://doi.org/10.7554/eLife.59282