The mitochondrial genome of stygobitic sponge Eunapius subterraneus: mtDNA is highly conserved in freshwater sponges |
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Authors: | Bruna Pleše Lada Lukić-Bilela Branka Bruvo-Mađarić Matija Harcet Mirna Imešek Helena Bilandžija Helena Ćetković |
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Institution: | 1. Department of Molecular Biology, Ru?er Bo?kovi? Institute, Bijeni?ka cesta 54, P.P. 180, 10002, Zagreb, Croatia 2. Institute for Genetic Engineering and Biotechnology, Gajev trg 4, 71 000, Sarajevo, Bosnia and Herzegovina 3. Department of Biology, Faculty of Science, University of Sarajevo, Zmaja od Bosne 33-35, 71000, Sarajevo, Bosnia and Herzegovina
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Abstract: | The complete mitochondrial DNA (mtDNA) genome of the Eunapius subterraneus (Porifera, Demospongiae), a unique stygobitic sponge, was analyzed and compared with previously published mitochondrial
genomes from this group. The 24,850 bp long mtDNA genome is circular with the same gene composition as found in other metazoans.
Intergenic regions (IGRs) comprise 24.7% of mtDNA and are abundant with direct and inverted repeats and palindromic elements
as well as with open reading fames (ORFs) whose distribution and homology was compared with other available mt genomes with
a special focus on freshwater sponges. Phylogenetic analyses based on concatenated amino acid sequences from 12 mt protein
genes placed E. subterraneus in a well-supported monophyletic clade with the freshwater sponges, Ephydatia muelleri and Lubomirskia baicalensis. Our study showed high homology of mtDNA genomes among freshwater sponges, implying their recent split. |
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