Two complete mitochondrial genomes fromPraticolella mexicanaPerez, 2011 (Polygyridae) and gene order evolution in Helicoidea (Mollusca, Gastropoda).
Helicoidea is a diverse group of land snails with a global distribution. While much is known regarding the relationships of helicoid taxa, comparatively little is known about the evolution of the mitochondrial genome in the superfamily. We sequenced two complete mitochondrial genomes fromPraticolella mexicanaPerez, 2011 representing the first such data from the helicoid family Polygyridae, and used them in an evolutionary analysis of mitogenomic gene order. We found the mitochondrial genome ofPraticolella mexicanato be 14,008 bp in size, possessing the typical 37 metazoan genes. Multiple alternate stop codons are used, as are incomplete stop codons. Mitogenome size and nucleotide content is consistent with other helicoid species. Our analysis of gene order suggested that Helicoidea has undergone four mitochondrial rearrangements in the past. Two rearrangements were limited to tRNA genes only, and two involved protein coding genes.
School of Science and Computer Engineering, University of Houston Clear Lake, 2700 Bay Area Boulevard MC 39, Houston, Texas 77058 USA.
Russell L
RL
Minton
Department of Biology, University of Texas Rio Grande Valley, 1201 West University Drive, Edinburg, Texas 78539 USA.
Marco A Martinez
MA
Cruz
UK Healthcare Genomics, 225 Plant Science Building, 1405 Veteran's Drive, University of Kentucky, Lexington, Kentucky 40546 USA.
Mark L
ML
Farman
Department of Biology, University of Texas Rio Grande Valley, 1201 West University Drive, Edinburg, Texas 78539 USA.
Kathryn E
KE
Perez
Gene rearrangement; convergence; homoplasy; mitochondria; phylogeny; tRNA