Abstract
The molecular controls governing organ shape are poorly understood. In the nematode Caenorhabditis elegans, the gonad acquires a U-shape by the directed migration of a specialized ‘leader’ cell, which is located at the tip of the growing gonadal ‘arm’1. The gon-1 gene is essential for gonadal morphogenesis: ingon-1 mutants, no arm elongation occurs and somatic gonadal structures are severely malformed2. Here we report that gon-1 encodes a secreted protein with a metalloprotease domain and multiple thrombospondin type-1-like repeats. This motif architecture is typical of a small family of genes that include bovine procollagen I N-protease (P1NP), which cleaves collagen3, and murine ADAMTS-1, the expression of which correlates with tumour cell progression4. We find that gon-1 is expressed in two sites, leader cells and muscle, and that expression in each site has a unique role in forming the gonad. We speculate that GON-1 controls morphogenesis by remodelling basement membranes and that regulation of its activity is crucial for achieving organ shape.
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Acknowledgements
We thank A. Coulson for providing cosmids, R. Barstead and A. Puoti for cDNA libraries, A. Fire for GFP and expression vectors, D. Gao for lag-2 promoter, J. Nance for Tc1 primers, theCaenorhabditis Genetics Center for worm strains, and the many lab members who provided thoughts and criticisms during the course of this work. R.B. is an MD/PhD student and was an NIH Molecular Biosciences trainee. J.K. is an investigator with the Howard Hughes Medical Institute and has been supported by grants from NIH and NSF.
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Blelloch, R., Kimble, J. Control of organ shape by a secreted metalloprotease in the nematode Caenorhabditis elegans. Nature 399, 586–590 (1999). https://doi.org/10.1038/21196
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DOI: https://doi.org/10.1038/21196