Molecular evolution in Panagrolaimus nematodes: origins of parthenogenesis, hermaphroditism and the Antarctic species P. davidi |
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| Authors: | Samantha C Lewis Leslie A Dyal Caroline F Hilburn Stephanie Weitz Wei-Siang Liau Craig W LaMunyon and Dee R Denver |
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| Institution: | (1) Department of Zoology and Center for Genome Research and Biocomputing, Oregon State University, Corvallis, Oregon 97331, USA;(2) Department of Biological Sciences, California State Polytechnic University, Pomona, California 91768, USA |
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| Abstract: | Background As exemplified by the famously successful model organism Caenorhabditis elegans, nematodes offer outstanding animal systems for investigating diverse biological phenomena due to their small genome sizes,
short generation times and ease of laboratory maintenance. Nematodes in the genus Panagrolaimus have served in comparative development and anhydrobiosis studies, and the Antarctic species P. davidi offers a powerful paradigm for understanding the biological mechanisms of extreme cold tolerance. Panagrolaimus nematodes are also unique in that examples of gonochoristic, hermaphroditic and parthenogenetic reproductive modes have been
reported for members of this genus. The evolutionary origins of these varying reproductive modes and the Antarctic species
P. davidi, however, remain enigmatic. |
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