The complete mitochondrial genome of the Antarctic springtail Cryptopygus antarcticus (Hexapoda: Collembola)

• Published in: BMC Genomics
• Main Authors: CARAPELLI, ANTONIO, COMANDI, SARA, NARDI, FRANCESCO, FRATI, FRANCESCO, CONVEY P.
• Other Authors: Carapelli, Antonio, Comandi, Sara, Convey, P., Nardi, Francesco, Frati, Francesco
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2008
• Subjects: Antarc*; Antarctic; Antarctic Springtail; antarcticus; Cryptopygus antarcticus; Springtail
• Online Access: http://hdl.handle.net/11365/19099; https://doi.org/10.1186/1471-2164-9-315; http://www.biomedcentral.com/1471-2164/9/315

Background: Mitogenomics data, i.e. complete mitochondrial genome sequences, are popular molecular markers used forphylogenetic, phylogeographic and ecological studies in different animal lineages. Their comparative analysis has been used toshed light on the evolutionary history of given taxa and on the molecular processes that regulate the evolution of themitochondrial genome. A considerable literature is available in the fields of invertebrate biochemical and ecophysiologicaladaptation to extreme environmental conditions, exemplified by those of the Antarctic. Nevertheless, limited molecular dataare available from terrestrial Antarctic species, and this study represents the first attempt towards the description of amitochondrial genome from one of the most widespread and common collembolan species of Antarctica.Results: In this study we describe the mitochondrial genome of the Antarctic collembolan Cryptopygus antarcticus Willem, 1901.The genome contains the standard set of 37 genes usually present in animal mtDNAs and a large non-coding fragment putativelycorresponding to the region (A+T-rich) responsible for the control of replication and transcription. All genes are arranged inthe gene order typical of Pancrustacea. Three additional short non-coding regions are present at gene junctions. Two of theseare located in positions of abrupt shift of the coding polarity of genes oriented on opposite strands suggesting a role in theattenuation of the polycistronic mRNA transcription(s). In addition, remnants of an additional copy of trnL(uag) are presentbetween trnS(uga) and nad1. Nucleotide composition is biased towards a high A% and T% (A+T = 70.9%), as typically found inhexapod mtDNAs. There is also a significant strand asymmetry, with the J-strand being more abundant in A and C. Within theA+T-rich region, some short sequence fragments appear to be similar (in position and primary sequence) to those involved inthe origin of the N-strand replication of the Drosophila mtDNA.Conclusion: The mitochondrial genome of ...