期刊
DEVELOPMENT
卷 141, 期 21, 页码 4098-4103出版社
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/dev.113498
关键词
Dachsous; Drosophila; Fat; Hippo; Planar polarity
资金
- Wellcome Trust New Investigator Award
- EU FP7 Award
- Fundacao para a Ciencia e a Tecnologia
- Cancer Research UK [19311] Funding Source: researchfish
- Wellcome Trust [102853/B/13/Z] Funding Source: researchfish
The atypical cadherins Dachsous (Ds) and Fat (Ft) are required to control the size and shape of tissues and organs in animals. In Drosophila, a key effector of Ds and Ft is the atypical myosin Dachs, which becomes planar polarised along the proximal-distal axis in developing epithelia to regulate tissue size via the Hippo pathway and tissue shape via modulating tension at junctions. How Ds and Ft control Dachs polarisation remains unclear. Here, we identify a ubiquitin ligase, FbxL7, as a novel component of the Ds-Ft-Dachs system that is required to control the level and localisation of Dachs. Loss of FbxL7 results in accumulation of Dachs, similar to loss of Ft. Overexpression of FbxL7 causes downregulation of Dachs, similar to overexpression of the Ft intracellular domain. In addition to regulating Dachs, FbxL7 also influences Ds in a similar manner. GFP-tagged FbxL7 localises to the plasma membrane in a Ft-dependent manner and is planar polarised. We propose that Ft recruits FbxL7 to the proximal side of the cell to help restrict Ds and Dachs to the distal side of the cell.
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