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Exploring the origins of animal body plans
  
 

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sleys at ualberta.ca
 
 
 

  
Publications
  1. Adams EDM, Goss, GG and SP Leys (2010). Sponges have Functional, Sealing Epithelia with High Transepithelial Resistance and Negative Transepithelial Potential. PLoS One. 5: e15040. PLoS One
  2. Holstein K, Rivera A, Windsor PJ, Ding S, Leys SP, Hill M and A Hill (2010). Expansion, diversification and expression of T-box family genes in Porifera. Development Genes and Evolution Online first:DOI 10.1007/s00427-010-0344-2. Dev Genes Evoln.
  3. Chu JWF and Leys SP, 2010. High resolution mapping of community structure in three glass sponge reefs (Porifera, Hexactinellida). Marine Ecology Progress Series. 417: 97-113. MEPS
  4. Windsor PJ, Leys SP (2010) Wnt signaling and induction in the sponge aquiferous system: evidence for an ancient origin of the organizer. Evolution & Development 12: 484-493.  Evo & Devo
  5. Elliott GRD, Leys SP (2010) Evidence for glutamate, GABA and NO in coordinating behaviour in the sponge, Ephydatia muelleri (Demospongiae, Spongillidae). Journal of Experimental Biology 213: 2310-2321. JEB
  6. Collin, R., A. S. Mobley, et al. (2010). "Phototactic responses of larvae from the marine sponges Neopetrosia proxima and Xestospongia bocatorensis (Haplosclerida: Petrosiidae). Invertebrate Biology 129(2): 121-128. Invertebrate Biology
  7. Srivastava M, Simakov O, Chapman J, Fahey, B., Gauthier, E.A., Mitros, T., Richards, G.S., Conaco, C., Dacre, M., Hellsten, U., Larroux, C., Putnam, N.H., Stanke, M., Adamska, M., Darling ,A., Degnan, S.M., Oakley, T., Plachetzki, D., Zhai, Y., Adamski, M., Calcino, A., Cummins, S.F., Goodstein, D.M, .Harris, C., Jackson, D., Leys, S.P., Shu, S., Woodcroft, B.J., Vervoort, M., Kosik, K.S., Manning, G., Degnan , B.M. and D.S. Rokhsar. (2010). The Amphimedon queenslandica genome and the evolution of animal complexity. Nature: 466(7307).
  8. Leys SP, Nichols SA, Adams EDM, (2009). Epithelia and integration in sponges. Integrative and Comparative Biology 49:167-177.
  9. Philippe, H, Derelle, R, Lopez, P, Pick, K, Borchiellini, C, Boury-Esnault, N, Vacelet, J, Renard, E, Houliston, E, Queinnec, E, Da Silva, C, Winicker, P, Le Guyader, H, Leys, S, Jackson, DJ, Schrieber, F, Erpenbeck, D, Morgenstern, B, Worheide, G, Manuel, M. (2009). Phylogenomics Revives Traditional views on deep animal relationships. Current Biology doi:10.1016/j.cub.2009.02.052
  10. Tompkins-MacDonald, GJ, Gallin, WJ, Sakaraya, O., Degnan, B., Leys, SP, and LM Boland, (2009). Expression of a poriferan potassium channel: Insights into the evolution of metazoan ion channels. Journal of Experimental Biology 212: 761-767
  11. Leys, S.P, Larroux, C, Gauthier M, Adamska M, Fahey B, Richards GS, Degnan SM, and BM Degnan. (2008). Isolation of Amphimedon Developmental Material. ColdSpringHarbor Protocols. Doi: 10.1101/pdb.prot5095.
  12. Degnan BM, Adamska M, Craigie A, Degnan SM, Fahey B, Gauthier M, Hooper JNA, Larroux C,  Leys SP, Lovas E, and GS Richards, (2008). The Demosponge Amphimedon queenslandica: Reconstructing the Ancestral Metazoan Genome and Deciphering the Origin of Animal Multicellularity. Cold Spring Harbor Protocols. Doi: 10.1101/pdb.emo108.
  13. Tompkins-MacDonald, GJ, and Leys, S.P. (2008). Glass sponges arrest pumping in response to sediment: implications for the physiology of the hexactinellid conduction system. Marine Biology 154(6): 973-954.
  14. Rosengarten, R.D., Sperling, E.A., Moreno, M.M., Leys, S.P., S.L. Dellaporta 2008. The mitochondrial genome of the hexactinellid sponge Aphrocallistes vastus: Evidence for programmed translational frameshifting. BMC Genomics 9:33 doi:10.1186/1471-2164-9-33
  15. Riesgo, A., Taylor, C., and Leys, S.P. 2007. Reproduction in a carnivorous sponges: implications of gametogenesis in the absence of an aquiferous system. Evolution and Development. 9(6):618-631. [NSERC]
  16. Elliott G.R.D. and Leys, S.P. 2007. Coordinated behaviour in a freshwater sponge: orchestrated contractions effectively expel water from the aquiferous system. Journal of Experimental Biology. 210:3736-3748.
  17. Leys, S.P. 2007. Sponge coordination, tissues, and the evolution of gastrulation. Porifera Research: Biodiversity, Innovation and Sustainability. Proceedings of the 7th International Porifera Congress, Buzios, Brazil. [NSERC]
  18. Leys, S.P., Mackie, G.O., and Reiswig, H.M. 2007. The biology of glass sponges. Advances in Marine Biology 52: 1-145.
  19. Yahel, G., Whitney, F., Reiswig, H.M., Eerkes-Medrano, D.I., and Leys, S.P. 2007. In situ feeding and metabolism in glass sponges (Hexactinellida, Porifera) studied in a deep temperate fjord with a remotely operated submersible. Limnology and Oceanography 52(1): 428-440.
  20. Yahel, G., Eerkes-Medrano, D.I. and Leys, S.P. 2006. Size independent selective filtration of ultraplankton by hexactinellid glass sponges. Aquatic Microbial Ecology 45: 181-194.
  21. Leys, S.P. and Eerkes-MedranoD.I. 2006. Feeding in a calcareous sponge. Particle uptake by pseudopodia. Biological Bulletin (Woods Hole) 211: 157-171.
  22. Eerkes-Medrano, D.I. and Leys, S.P. 2006. Ultrastructure and embryonic development of a syconoid calcareous sponge. Invertebrate Biology 125(3):177-194.
  23. Larroux, C., Fahey, B., Liubicich, D., Hinman, V.F., Gauthier, M., Gongora, M., Wörheide, G., Leys, S.P., Degnan, B.M. 2006. Developmental expression of transcription factor genes in a demosponge: insights into the origin of metazoan multicellularity. Evolution & Development 8(2): 50-173.
  24. Leys, S.P. and Ereskovsky, A.V. 2006. Embryogenesis and larval differentiation in sponges. Canadian Journal of Zoolology 84(2): 262-287.
  25. Leys, S.P. and Meech, R.W. 2006. Physiology of coordination in sponges. Canadian Journal of Zoolology 84(2): 288-306.
  26. Leys, S.P., Cheung, E.C., Boury-Esnault, N. 2006. Embyrogenesis in the glass sponge Oopsacas minuta: formation of syncytia by fusion of blastomeres. Integrative and Comparative Biology 46(2): 104-117.
  27. Leys, S.P. and Austin, B.A. Sponges. 2006. In: Encyclopedia of Tidepools. (M.W. Denny and S.D. Gaines eds).
  28. Leys, S.P. and Eerkes-Medrano, D. I. 2005. Gastrulation in calcareous sponges: in search of Haeckel’s Gastraea. Integrative and Comparative Biolology 45(2):342-351.
  29. Degnan, B.M., Leys, S.P. and Larroux, C. 2005. Sponge development and antiquity of animal pattern formation. Integrative and Comparative Biology 45(2): 335-341.
  30. Leys, S.P., Rokhsar, D.S. and Degnan, B.M. 2005. Quick Guide: Sponges. Current Biology 15:R114-R115.
  31. Leys, S.P., Wilson, K., Holeton, C., Reiswig, H.M., Austin, B., and Tunnicliffe, V. 2004. Patterns of glass sponge (Porifera, Hexactinellida) distribution in coastal waters of British Columbia, Canada.  Marine Ecology Progress Series 283:133-149.
  32. Leys S.P. 2004. Gastrulation in sponges. In: Gastrulation: from cells to embryos (ed. C. Stern). Cold Spring Harbor Laboratory Press, New York. Pp. 23-31.
  33. Leys, S.P. and H.M. Reiswig, 2004. Hexactinellida. In: Grzimek’s Animal Life Encyclopedia, 2nd Edition.Volume 2, Lower Metazoans and Deuterostomes, edited by Michael Hutchins, Dennis Thoney, and Neil Schlager.  Farmington Hills, MI: Gale Group. Pp 67-76.
  34. Elliott G.R.D., Macdonald T.A. and Leys, S.P. 2004. Sponge larval phototaxis: a comparative study. Bollettino dei Musei e degli Istituti Biologici dell'Universita di Genova. 68:291-300.
  35. Schröder, H.C., Krasko, A., Gundacker, D., Leys, S.P., Müller, I.M., and Müller, W.E.G., 2003. Molecular and functional analysis of the (6-4) photolyase from the hexactinellid Aphrocallistes vastus. Biochimica et Biophysica Acta 1651(1-2):41-9.
  36. Leys, S.P. 2003.  A comparative study of spiculogenesis in demosponge and hexactinellid larvae. Microscopy Research and Technique 62:300-311.
  37. Leys, S.P. 2003.  The significance of syncytial tissues for the position of the Hexactinellida in the Metazoa. Integrative and Comparative Biology 43:19-27.
  38. Leys, S.P., and B.M. Degnan, 2002. Embryogenesis and metamorphosis in a haplosclerid demosponge: gastrulation and transdifferentiation of larval ciliated cells to choanocytes. Invertebrate Biology 121:171-189.
  39. Jackson, D., Leys, S.P., Hinman, V.F., Woods, R., Lavin, M.F. and B. M. Degnan, 2002. Environmental regulation of development: induction of marine invertebrate metamorphosis. International Journal of Developmental Biology 46:679-686.
  40. Leys, S.P., Cronin, T.W., Degnan, B.M. and J.M. Marshall, 2002. Spectral sensitivity in a sponge larva. Journal of Comparative Physiology - A 188:199-202.
  41. Leys, S.P. and B.M. Degnan, 2001. The cytological basis of photoresponsive behaviour in a sponge larva. Biological Bulletin, Woods Hole 201:323-338.
  42. Gundacker, D., Leys, S.P., Schröder, H.C., Müller, I.M. and W.E.G. Müller, 2001. Isolation and cloning of the C-type lectin from the hexactinellid sponge Aphrocallistes vastus: A species-unspecific aggregation factor. Glycobiology 11(1):21-29.
  43. Leys, S.P. 1999. The choanosome of hexactinellid sponges. Invertebrate Biology 118:221-235.
  44. Leys, S.P., Mackie, G.O. and R.W. Meech, 1999. Impulse conduction in a sponge. Journal of Experimental Biology 202: 1139-1150.
  45. Leys, S.P. 1999. Introduction to Studies on Cell Adhesion Using Invertebrate Models. Microscopy Research and Technique 44:201-203.
  46. Leys, S.P. and H.M. Reiswig, 1998. Nutrient transport pathways in the neotropical sponge Aplysina. Biological Bulletin, Woods Hole 195:30-42.
  47. Leys, S.P. and R.J.N. Lauzon, 1998. The ecology of a deep sea sponge: growth and seasonality in Rhabdocalyptus dawsoni. Journal of  Experimental Marine Biology and Ecology 230:111-129.
  48. Kruse, M., Leys, S.P., Müller I.M., W.E.G. Müller, 1998. Phylogenetic position of the Hexactinellida within the phylum Porifera based on amino acid sequence of the protein kinase C from Rhabdocalyptus dawsoni. Journal of Molecular Evolution 46:721-728.
  49. Müller, W.E.G, Kruse, M., Koziol, C., and S.P. Leys, 1998. Evolution of early Metazoa: phylogenetic status of the Hexactinellida within the phylum of Porifera [sponges]. Progress in Molecular and Subcelular Biology 21:141-156.
  50. Aphrocallistes vastus. In: Sponge Sciences. Proc. International Conference on Sponge Science held at Lake Biwa Research Institute, Japan, March 1996, pp. 215-226. Springer-Verlag, Tokyo
  51. Koziol, C., Leys, S.P., Müller, W.E.G. I.M, Müller, 1997. Cloning of Hsp70 genes from the marine sponges Sycon raphanus (Calcarea) and Rhabdocalyptus dawsoni (Hexactinellida). An approach to solve the phylogeny of sponges. Biological Journal of the Linnean Society 62:581-592.
  52. Leys, S.P., 1997. Sponge cell culture substrates: a comparative evaluation of their effects on adhesion. Tissue and Cell 29:77-87.
  53. Wyeth, R.C., Leys, S.P. and G.O. Mackie 1996. Use of sandwich cultures for the study of feeding in the hexactinellid sponge Rhabdocalyptus dawsoni (Lambe, 1892). Acta Zoologica 77(3):227-232.
  54. Leys, S.P. 1995. Cytoskeletal architecture and organelle transport in giant syncytia formed by fusion of hexactinellid sponge tissues. Biological Bulletin, Woods Hole 188:241-254.