Abstract：
:We present the first two mitochondrial genomes of Muscidae dipterans for the species Haematobia irritans (the horn fly) and Stomoxys calcitrans (the stable fly). Typical insect mtDNA features are described, such as a high A+T content (79.1% and 78.9%, respectively), the preference for A+T-rich codons, and the evidence of a non-optimal codon usage. The strong A+T enrichment partially masks another nucleotide content bias maintained by A+C mutation pressure in these Muscidae mtDNAs. The analysis of this data provides a model of metazoans tRNA anticodon evolution, based on the selection hypothesis of anticodon versatility. H. irritans mitochondrial genome (16078 bp) is structurally similar to the hypothetical ancestral mitochondrial genome of arthropods and its control region (A+ T-rich region in insects) organization is consistent with the structure described for Brachycera dipterans. On the other hand, the mitochondrial genome of S. calcitrans is approximately 2kb longer (18 kb), characterized by the presence of approximately 550 bp tandem repeats in the control region, and an extra copy of trnI remarkably similar to a duplicated element of blowflies mtDNA. Putative sequence elements, involved in the regulation of transcription and replication of the mtDNA, were reliably identified in S. calcitrans control region despite the 0.8-1.5 kb gap uncovered from this genome. The use of amino acid and nucleotide sequences of concatenated mitochondrial protein-coding genes (PCGs) in phylogenetic reconstructions of Diptera does not support the monophyly of Muscomorpha, as well as the monophyly of Acalyptratae. Within the Calyptratae group, the inclusion of Muscidae (Muscoidea) as a sister group of Calliphoridae (Oestroidea) implies in a potential conflict concerning the monophyly of the superfamily Oestroidea.
journal_name
Mol Phylogenet Evoljournal_title
Molecular phylogenetics and evolutionauthors
Oliveira MT,Barau JG,Junqueira AC,Feijão PC,Rosa AC,Abreu CF,Azeredo-Espin AM,Lessinger ACdoi
10.1016/j.ympev.2008.05.022subject
Has Abstractpub_date
2008-09-01 00:00:00pages
850-7issue
3eissn
1055-7903issn
1095-9513pii
S1055-7903(08)00267-4journal_volume
48pub_type
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