Extensive mitochondrial gene arrangements in coleoid Cephalopoda and their phylogenetic implications

We determined the complete mitochondrial genomes of five cephalopods of the Subclass Coleoidea (Suborder Oegopsida: Watasenia scintillans, Todarodes pacificus, Suborder Myopsida: Sepioteuthis lessoniana, Order Sepiida: Sepia officinalis, and Order Octopoda: Octopus ocellatus) and used them to infer...

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Bibliographic Details
Published in:Molecular phylogenetics and evolution 2006-03, Vol.38 (3), p.648-658
Main Authors: Akasaki, Tetsuya, Nikaido, Masato, Tsuchiya, Kotaro, Segawa, Susumu, Hasegawa, Masami, Okada, Norihiro
Format: Article
Language:English
Subjects:
Animals
Base Sequence
Cephalopoda
Cephalopoda - classification
Cephalopoda - genetics
Cephalopods
Coleoidea
Decapodiformes
DNA Primers
DNA, Mitochondrial - genetics
Evolution
Gene Order
Gene rearrangement
Likelihood Functions
Loligo bleekeri
Mitochondria
Myopsida
Octopus ocellatus
Oegopsida
Phylogeny
Sepia officinalis
Sepioteuthis lessoniana
Teuthida
Todarodes pacificus
Watasenia scintillans
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Summary:We determined the complete mitochondrial genomes of five cephalopods of the Subclass Coleoidea (Suborder Oegopsida: Watasenia scintillans, Todarodes pacificus, Suborder Myopsida: Sepioteuthis lessoniana, Order Sepiida: Sepia officinalis, and Order Octopoda: Octopus ocellatus) and used them to infer phylogenetic relationships. In our Maximum Likelihood (ML) tree, sepiids (cuttlefish) are at the most basal position of all decapodiformes, and oegopsids and myopsids form a monophyletic clade, thus supporting the traditional classification of the Order Teuthida. We detected extensive gene rearrangements in the mitochondrial genomes of broad cephalopod groups. It is likely that the arrangements of mitochondrial genes in Oegopsida and Sepiida were derived from those of Octopoda, which is thought to be the ancestral order, by entire gene duplication and random gene loss. Oegopsida in particular has undergone long-range gene duplications. We also found that the mitochondrial gene arrangement of Sepioteuthis lessoniana differs from that of Loligo bleekeri, although they belong to the same family. Analysis of both the phylogenetic tree and mitochondrial gene rearrangements of coleoid Cephalopoda suggests that each mitochondrial gene arrangement was acquired after the divergence of each lineage.
ISSN:1055-7903
1095-9513
DOI:10.1016/j.ympev.2005.10.018