Multicellular Organization Laboratory • Sawa Group

Developmental cell biology using C. elegans

Faculty



Research Summary

Asymmetric cell division that produces daughter cells with distinct cell fates is a fundamental mechanism by which cellular diversity is produced. Most cells in C. elegans have the same anterior-posterior polarity in terms of localizations of Wnt signaling components such as β-catenin, and divide asymmetrically to produce a variety of cell types. We are studying how each cell knows the correct orientation, how it divides asymmetrically and how the daughter cells acquire specific cell fates. We are also studying mechanisms of cell invasion and secretion of basement membrane proteins.

Asymmetric localization of β-catenin before (A) and at telophase (B) of asymmetric division. Arrowheads indicate cell boundary. (C) Polarity orientation (arrows) of epithelial stem cells (light blue) is redundantly controlled by three Wnt molecules (CWN-1, CWN-2, EGL-20). Localization of a basement membrane protein in pharynx in wild type (D) and a mutant (E). In the mutant, the protein forms aggregation.

Publications

Ihara, S., Nakayama, S, Murakami, Y., Suzuki, E., Asakawa, M., Kinoshita, T., and Sawa, H. (2017). PIGN prevents protein aggregation in the endoplasmic reticulum independently of its function in the GPI synthesis. J Cell Sci 130, 602-613.

Sugioka, K., Mizumoto, K., and Sawa, H. (2011). Wnt regulates spindle asymmetry to generate asymmetric nuclear β-catenin C. elegans. Cell 146, 942-954.

Yamamoto, Y., Takeshita, H., and Sawa, H. (2011). Multiple Wnts redundantly control polarity orientation in Caenorhabditis elegans epithelial stem cells. PLoS Genet 7, e1002308.


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