Molecular evolution in Panagrolaimus nematodes: origins of parthenogenesis, hermaphroditism and the Antarctic species P. davidi.

BMC Evolutionary Biology
Samantha C LewisDee R Denver

Abstract

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. We collected nuclear ribosomal RNA gene and mitochondrial protein-coding gene sequences from diverse Panagrolaimus species and strains, including newly discovered isolates from Oregon, to investigate phylogenetic relationships in this nematode genus. Nuclear phylogenies showed that the species and strains historically identified as members of Panagrolaimus constitute a paraphyletic group, suggesting that taxonomic revision is required for Pana...Continue Reading

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Citations

Jul 28, 2012·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Mélianie R Raymond, David A Wharton
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Dec 10, 2019·Journal of Nematology·Erik J RagsdaleJoseph F Biddle

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Datasets Mentioned

BETA
FJ590596
FJ591048

Methods Mentioned

BETA
PCR

Software Mentioned

NJ phylogram
MEGA4
ClustalW
DnaSP
MP phylogram

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