Evolutionary mitogenomics of Chordata: the strange case of ascidians and vertebrates
The availability of almost one thousand complete mitochondrial genome (mtDNA) sequences of chordates provides an almost unique opportunity to analyse the evolution of this genome in the phylum Chordata, and to identify possible divergent evolutionary trends followed by the three chordate subphyla:...
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University of Modena and Reggio Emilia
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doaj-a5d5ba4d9c6e43cc9cb52d7eeeb2c6692020-12-02T18:38:46ZengUniversity of Modena and Reggio EmiliaInvertebrate Survival Journal1824-307X2009-03-0161 (Suppl)Evolutionary mitogenomics of Chordata: the strange case of ascidians and vertebratesC Gissi0F Griggio1F Iannelli2Dipartimento di Scienze Biomolecolari e Biotecnologie, Università di Milano, Milano, ItalyDipartimento di Scienze Biomolecolari e Biotecnologie, Università di Milano, Milano, ItalyDipartimento di Scienze Biomolecolari e Biotecnologie, Università di Milano, Milano, Italy The availability of almost one thousand complete mitochondrial genome (mtDNA) sequences of chordates provides an almost unique opportunity to analyse the evolution of this genome in the phylum Chordata, and to identify possible divergent evolutionary trends followed by the three chordate subphyla: Vertebrata, Cephalochordata and Tunicata. Here, we review some genome-level features of mtDNA, such as genetic code, gene content, genome architecture and gene strand asymmetry, mostly focusing on differences existing between tunicates and remaining chordates. Indeed, tunicate mtDNAs show a surprisingly high variability in several genome-level features, even though the current tunicate taxon sampling is absolutely insufficient and is focused mainly on the class Ascidiacea. On the contrary, a stabilization of the mtDNA structural and evolutionary features is observed in both cephalochordates and vertebrates, where genome-level features are almost invariant. Thus, different evolutionary dynamics, probably related to divergent functional constraints, have modelled the overall mtDNA structure and organization of the three chordate subphyla. https://isj02.unimore.it/index.php/ISJ/article/view/185mitochondrial genomeevolutionchordatestunicatesascidians |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
C Gissi F Griggio F Iannelli |
spellingShingle |
C Gissi F Griggio F Iannelli Evolutionary mitogenomics of Chordata: the strange case of ascidians and vertebrates Invertebrate Survival Journal mitochondrial genome evolution chordates tunicates ascidians |
author_facet |
C Gissi F Griggio F Iannelli |
author_sort |
C Gissi |
title |
Evolutionary mitogenomics of Chordata: the strange case of ascidians and vertebrates |
title_short |
Evolutionary mitogenomics of Chordata: the strange case of ascidians and vertebrates |
title_full |
Evolutionary mitogenomics of Chordata: the strange case of ascidians and vertebrates |
title_fullStr |
Evolutionary mitogenomics of Chordata: the strange case of ascidians and vertebrates |
title_full_unstemmed |
Evolutionary mitogenomics of Chordata: the strange case of ascidians and vertebrates |
title_sort |
evolutionary mitogenomics of chordata: the strange case of ascidians and vertebrates |
publisher |
University of Modena and Reggio Emilia |
series |
Invertebrate Survival Journal |
issn |
1824-307X |
publishDate |
2009-03-01 |
description |
The availability of almost one thousand complete mitochondrial genome (mtDNA) sequences of
chordates provides an almost unique opportunity to analyse the evolution of this genome in the
phylum Chordata, and to identify possible divergent evolutionary trends followed by the three chordate subphyla: Vertebrata, Cephalochordata and Tunicata. Here, we review some genome-level features of mtDNA, such as genetic code, gene content, genome architecture and gene strand asymmetry, mostly focusing on differences existing between tunicates and remaining chordates. Indeed, tunicate mtDNAs show a surprisingly high variability in several genome-level features, even though the current tunicate taxon sampling is absolutely insufficient and is focused mainly on the class Ascidiacea. On the contrary, a stabilization of the mtDNA structural and evolutionary features is observed in both cephalochordates and vertebrates, where genome-level features are almost invariant. Thus, different evolutionary dynamics, probably related to divergent functional constraints, have modelled the overall mtDNA structure and organization of the three chordate subphyla.
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topic |
mitochondrial genome evolution chordates tunicates ascidians |
url |
https://isj02.unimore.it/index.php/ISJ/article/view/185 |
work_keys_str_mv |
AT cgissi evolutionarymitogenomicsofchordatathestrangecaseofascidiansandvertebrates AT fgriggio evolutionarymitogenomicsofchordatathestrangecaseofascidiansandvertebrates AT fiannelli evolutionarymitogenomicsofchordatathestrangecaseofascidiansandvertebrates |
_version_ |
1724403351111598080 |