I am broadly interested in the origins and genetic basis of adaptive variation. This variation is often the product of natural selection. Identifying it and understanding how it works represent both the challenge and promise of modern biology.
Projects and Stories
Recent Publications
Facultative pupal mating in Heliconius erato: implications for mate choice, female preference and speciation. Ecology and Evolution, 8(3):1882-1889.
Macro-evolutionary shifts of WntA function potentiate butterfly wing pattern diversity, Proceedings of the National Academy of Sciences USA, 114 (40):10701-10706.
Complex modular architecture around a simple toolkit of wing pattern genes. Nature Ecology and Evolution, 1:0052.
Research Focus
I am broadly interested in the genetics of adaptation and speciation. How do new species form? How does adaptive variation arise and spread? How is morphological variation created through development and modified by natural selection? Is evolution predictable?
The focus of my lab’s research in recent years has been the convergent evolution of wing pattern development in Heliconius butterflies (for which my lab contributed to sequencing the entire genome) throughout the New World tropics. In addition to broad geographic sampling of butterflies, my research group also maintains populations of various species of Heliconius in insectaries in Gamboa, Panama, that can be used for experimental crosses.
As Dean of Academic programs, I oversee STRI’s large group of visiting scholars who number 800 every year, hail from dozens of countries and research institutions, and range in expertise from interns to postdoctoral fellows.
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Research Overview
How do differences between organisms arise and spread?
My research leverages genomic technologies to identify functionally important regions of the genome. Recent research has focused on the evolution of wing patterns in Heliconius butterflies. The enormous wing pattern variation in the group offers exceptional opportunities for genomic level studies designed to reveal how morphological variation is created through development and modified by natural selection within the context of an extraordinary adaptive radiation. I maintain an active molecular genetic lab, as well as experimental facilities for Heliconius culture and study.
Education
Duke University, Zoology, B.Sc., 1985
University of Hawaii, Zoology, M.Sc., 1991
University of Hawaii, Zoology, Ph.D., 1994
University College London, Genetics, Postdoctoral, 1994-1997
Selected Publications
Hench, K., M. Helmkampf, W. O. McMillan, and O. Puebla. (2022) Rapid radiation in a highly diverse marine environment. Proceedings of the National Academy of Sciences 119 (4): e2020457119.
Livraghi, L., J. J. Hanly, S. M. Van Bellghem, G. Montejo-Kovacevich, E. van Der Heijden, L. S. Loh, A. Ren, I. A. Warren, J. J. Lewis, C. Concha, L. Hebberecht, C. J. Wright, J. M. Walker, J. Foley, Z. H. Goldberg, H. Arenas-Castro, C. Salazar, M. Perry, R. Papa, A. Martin, W. O. McMillan*, and C. D. Jiggins*. (2021) Cortex cis-regulatory switches establish scale colour identity and pattern diversity in Heliconius. Elife, 10: https://doi.org/10.7554/eLife.68549.
Rossi, M., T. J. Thurman, A. E. Hausmann, S. H. Montgomery, R. Papa, C. D. Jiggins, W. O McMillan, and R. M. Merrill. (2021) Visual mate preference evolution during butterfly speciation is linked to neural processing genes. Nature Communications, 11(1).1-10.
Thurman, T.*, E. Brodie*, E. Evans and W. O. McMillan. (2018) Facultative pupal mating in Heliconius erato: implications for mate choice, female preference and speciation. Ecology and Evolution, 8(3):1882-1889.
Mazo-Vargas, A., C. Concha, L. Livraghi, D. Massardo, W. R. Wallbank, L. Zhang, J. Papador, D. Martinez-Najera, C. D. Jiggins, M. R. Kronforst, C. J. Breuker, R. D. Reed, N. H Patel, W. O. McMillan and A. Martin. (2017) Macro-evolutionary shifts of WntA function potentiate butterfly wing pattern diversity, Proceedings of the National Academy of Sciences USA, 114 (40):10701-10706.
Van Belleghem, S. M., P. Rastas, A. Papanicolaou, S. H. Martin, J. J. Hanly, J. Mallet, J. J. Lewis, H. M. Hines, M. Ruiz, G. R. P. Moreira, C. D. Jiggins, B. A. Counterman*, W. O. McMillan* and R. Papa*. (2017) Complex modular architecture around a simple toolkit of wing pattern genes. Nature Ecology and Evolution, 1:0052.
Nadeau, N. J., C. Pardo-Diaz, A. Wibley, M. Supple, R. Wallbank, G. Wu, L. Maroja, L. Ferguson, H. Hines, C. Salazar, R. J. Tetley, S. Carl, R. ffrench-Constant, M. Joron, W. O. McMillan and C. D. Jiggins. (2016) The origins of a novel butterfly wing patterning gene from within a family of conserved cell cycle regulators. Nature 534(7605): 106–110. doi:10.1038/nature17961.
Supple, M. A., R. Papa, B. A. Counterman and W. Owen McMillan (2013) The genomics of an adaptive radiation– insights across the Heliconius speciation continuum. In Ecological Genomics, 249-271. Landry, C.R. and Aubin-Horth, N. (Eds). Springer.
Supple, M. A., H. M. Hines, K. K. Dasmahapatra, D. M. Nielsen, C. Lavoie, D. A. Ray, C. Salazar, W. O. McMillan*, and B. A. Counterman* (2013) Genomic architecture of adaptive color pattern divergence and convergence in Heliconius butterflies. Genome Research, 23:1248-1257.
Martin, A., R. Papa, N. J. Nadeau, R. I. Hill, B. A.Counterman, G. Halder, C. D. Jiggins, M. R. Kronforst, A Long, W. O. McMillan*, and R. D. Reed* (2012) Diversification of complex butterfly wing patterns by repeated regulator evolution of WntA. Proceedings of the National Academy of Sciences USA, 109(31):12632-12637.
Puebla, O., Bermingham, E., and W. O. McMillan (2012) On the spatial scale of dispersal in coral reef fishes. Molecular Ecology, 21:5675-5688
The Heliconius Genome Consortium (2012) Heliconius butterfly genome reveals promiscuous exchange of adaptive genetic variation among species. Nature, 487(7405): 94-98.
Hines, H. M., B. A. Counterman, R. Papa, P. Albuquerque de Moura, M. Z. Cardoso, M. Linares, J. Mallet, R. D. Reed, C. D. Jiggins, M. R. Kronforst, and W. O. McMillan (2011) Wing patterning gene redefines the mimetic history of Heliconius butterflies. Proceedings of the National Academy of Sciences USA, 118(49): 19666-19671.
Reed, R. D.*, R. Papa*, A. Martin, H. M. Hines, B. A. Counterman, C. Pardo-Diaz, C. D. Jiggins, N. L. Chamberlain, M. R. Kronforst, R. Chen, G. Halder, H. F. Nijhout, and W. O. McMillan (2011) optixs drives repeated convergent evolution in butterfly color pattern mimicry. Science, 333: 1137-1141