The goal of this competitive revision is to identify macromolecular interactions that influence microtubule stability and function in the nematode Caenorhabditis elegans, by finding conditional mutations in essential genes that are required for early embryonic cell division. Conditional (heat-sensitive) mutations remain the most valuable genetic tool available for the in vivo investigation of essential gene requirements, and C. elegans is unique as an animal model in which one can feasibly isolate large numbers of rare conditional mutations. This proposal seeks to substantially expand our identification of conditional mutations in essential C. elegans genes that influence microtubule stability and function. This will be done by (i) identifying and genetically characterizing a collection of early embryonic cell division defective conditional C. elegans mutants;(ii) using next generation whole genome DNA sequencing to rapidly map and identify the causal mutations in the mutant collection;and (iii) using DNA transformation to verify the identity of the causal mutations through rescue of conditional lethality with wild-type copies of the affected genes.
Specific Aim 1 focuses on an examination of 2000 newly isolated temperature-sensitive, embryonic- lethal C. elegans mutants to identify those mutants with early embryonic cell division defects. These mutants will be examined using videomicroscopy of early embryogenesis to determine the nature and penetrance of the cell division defects. Genetic analysis will be done to determine if the mutations exhibit Mendelian inheritance and if the mutations are recessive or dominant.
Specific Aim 2 focuses on the use of a polymorphic C. elegans strain and Illumina-based whole genome DNA sequencing to map the location of conditional mutations and to identify within whole genome sequences the likely causal mutations responsible for embryonic lethality. To our knowledge, we are the first laboratory to apply this high throughput and cost-effective approach to the mapping and positional cloning of large numbers of lethal C. elegans mutants.
Specific Aim 3 seeks to confirm the identity of causal mutations by testing for rescue of viability after ballistic transformation of conditional mutants with wild-type copies of the implicated genes.

Public Health Relevance

Relevance. Our ultimate goal is to greatly expand the number of conditional mutations in essential C. elegans genes that influence microtubule stability and function during early embryonic cell divisions. Cell division and other microtubule dependent processes are of fundamental importance to cancer biology and other human diseases, and most essential C. elegans genes required for cell division are highly conserved in humans.

National Institute of Health (NIH)
National Institute of General Medical Sciences (NIGMS)
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Special Emphasis Panel (ZGM1-CBB-0 (MI))
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Deatherage, James F
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University of Oregon
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Severson, Aaron F; von Dassow, George; Bowerman, Bruce (2016) Oocyte Meiotic Spindle Assembly and Function. Curr Top Dev Biol 116:65-98
Connolly, Amy A; Sugioka, Kenji; Chuang, Chien-Hui et al. (2015) KLP-7 acts through the Ndc80 complex to limit pole number in C. elegans oocyte meiotic spindle assembly. J Cell Biol 210:917-32
Lowry, Josh; Yochem, John; Chuang, Chien-Hui et al. (2015) High-Throughput Cloning of Temperature-Sensitive Caenorhabditis elegans Mutants with Adult Syncytial Germline Membrane Architecture Defects. G3 (Bethesda) 5:2241-55
Du, Zhuo; He, Fei; Yu, Zidong et al. (2015) E3 ubiquitin ligases promote progression of differentiation during C. elegans embryogenesis. Dev Biol 398:267-79
Phillips, Patrick C; Bowerman, Bruce (2015) Cell biology: scaling and the emergence of evolutionary cell biology. Curr Biol 25:R223-5
Keikhaee, Mohammad R; Nash, Eric B; O'Rourke, Sean M et al. (2014) A semi-dominant mutation in the general splicing factor SF3a66 causes anterior-posterior axis reversal in one-cell stage C. elegans embryos. PLoS One 9:e106484
Connolly, Amy A; Osterberg, Valerie; Christensen, Sara et al. (2014) Caenorhabditis elegans oocyte meiotic spindle pole assembly requires microtubule severing and the calponin homology domain protein ASPM-1. Mol Biol Cell 25:1298-311
Burger, Julien; Merlet, Jorge; Tavernier, Nicolas et al. (2013) CRL2(LRR-1) E3-ligase regulates proliferation and progression through meiosis in the Caenorhabditis elegans germline. PLoS Genet 9:e1003375
Schneider, Stephan Q; Bowerman, Bruce (2013) Animal development: an ancient β-catenin switch? Curr Biol 23:R313-5
De Arras, Lesly; Seng, Amara; Lackford, Brad et al. (2013) An evolutionarily conserved innate immunity protein interaction network. J Biol Chem 288:1967-78

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