Apical constriction is a cell shape change that drives morphogenetic events in diverse animal systems, including neural tube formation in vertebrates. An understanding of the mechanisms by which cells shrink their apical domains can address fundamental questions about how animal embryos are shaped, and it can lay a foundation for future diagnosis and prevention of human neural tube closure defects, which are among the most common and serious human birth defects. The long-term goal toward which this project contributes is to understand how forces are transmitted with spatial and temporal precision to shape cells and tissues in developing organisms. This goal will be approached using Caenorhabditis elegans as a model system. Gastrulation in C. elegans begins with two endodermal precursor cells (EPCs) undergoing apical constriction, moving from the embryo's surface to the interior, at the 26-28 cell stage. Experiments have determined that actomyosin contractions begin well before apical domains begin to shrink, and that only later do the edges of the apical surfaces begin to narrow in concert with actomyosin contractions-implying that the key connection between the two is not constitutive. The objective of this proposal is to understand the mechanisms that lie at the heart of how cells change shape in an in vivo, developmental context. Our proposed experiments capitalize on strengths of the model system, in which relevant molecules can be identified, and in which mechanisms can be unraveled by a combination of diverse experimental tools.
The aims of the project are to (1) dissect the mechanisms by which the edges of the cells'apical surfaces become linked to pre-existing actomyosin contractions, triggering the shrinking of cells'apical domains, (2) determine the role of a protein that appears on the surfaces of apically constricting cells as apical constriction begins, and (3) integrate genetic studies with the mechanistic studies above, by identifying and studying new proteins involved in apical constriction by the mechanisms above. Successful completion of these aims will reveal key mechanisms underlying apical constriction, an important developmental process. The work has the potential to establish a paradigm for developmental control of cytoskeletal mechanisms, to establish a new mechanism for initiation of a developmental cell shape change, and to identify new molecules that could be relevant to morphogenesis in diverse animal systems including neural tube closure in human development.

Public Health Relevance

This proposal focuses on understanding the mechanisms of apical constriction, which drives morphogenetic events in diverse animal systems, including neural tube formation in vertebrates. Defects in closure of the neural tube are frequent in humans, comprising one of the leading classes of birth defects, and occurring annually in approximately 300,000 newborns worldwide. An understanding of the mechanisms by which cells shrink their apical domains and become internalized can lay a foundation for future diagnosis and prevention of human neural tube closure defects.

National Institute of Health (NIH)
National Institute of General Medical Sciences (NIGMS)
Research Project (R01)
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Development - 2 Study Section (DEV2)
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Hoodbhoy, Tanya
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University of North Carolina Chapel Hill
Schools of Arts and Sciences
Chapel Hill
United States
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Martin, Adam C; Goldstein, Bob (2014) Apical constriction: themes and variations on a cellular mechanism driving morphogenesis. Development 141:1987-98
Peters, Eldon C; Gossett, Andrea J; Goldstein, Bob et al. (2013) Redundant canonical and noncanonical Caenorhabditis elegans p21-activated kinase signaling governs distal tip cell migrations. G3 (Bethesda) 3:181-95
Dickinson, Daniel J; Ward, Jordan D; Reiner, David J et al. (2013) Engineering the Caenorhabditis elegans genome using Cas9-triggered homologous recombination. Nat Methods 10:1028-34
Edgar, Lois G; Goldstein, Bob (2012) Culture and manipulation of embryonic cells. Methods Cell Biol 107:151-75
Roh-Johnson, Minna; Shemer, Gidi; Higgins, Christopher D et al. (2012) Triggering a cell shape change by exploiting preexisting actomyosin contractions. Science 335:1232-5
Sawyer, Jacob M; Glass, Stephanie; Li, Trudy et al. (2011) Overcoming redundancy: an RNAi enhancer screen for morphogenesis genes in Caenorhabditis elegans. Genetics 188:549-64
Werts, Adam D; Goldstein, Bob (2011) How signaling between cells can orient a mitotic spindle. Semin Cell Dev Biol 22:842-9
Harrell, Jessica R; Goldstein, Bob (2011) Internalization of multiple cells during C. elegans gastrulation depends on common cytoskeletal mechanisms but different cell polarity and cell fate regulators. Dev Biol 350:1-12
Sawyer, Jacob M; Harrell, Jessica R; Shemer, Gidi et al. (2010) Apical constriction: a cell shape change that can drive morphogenesis. Dev Biol 341:5-19
Arata, Yukinobu; Lee, Jen-Yi; Goldstein, Bob et al. (2010) Extracellular control of PAR protein localization during asymmetric cell division in the C. elegans embryo. Development 137:3337-45

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