TY - JOUR
T1 - The cephalopod Loligo bleekeri mitochondrial genome
T2 - Multiplied noncoding regions and transposition of tRNA genes
AU - Tomita, Kozo
AU - Yokobori, Shin ichi
AU - Oshima, Tairo
AU - Ueda, Takuya
AU - Watanabe, Kimitsuna
PY - 2002/4/13
Y1 - 2002/4/13
N2 - We previously reported the sequence of a 9260-bp fragment of mitochondrial (mt) DNA of the cephalopod Loligo bleekeri [J. Sasuga et al. (1999) J. Mol. Evol. 48:692-702]. To clarify further the characteristics of Loligo mtDNA, we have sequenced an 8148-bp fragment to reveal the complete mt genome sequence. Loligo mtDNA is 17,211 bp long and possesses a standard set of metazoan mt genes. Its gene arrangement is not identical to any other metazoan mt gene arrangement reported so far. Three of the 19 noncoding regions longer than 10 bp are 515, 507, and 509 bp long, and their sequences are nearly identical, suggesting that multiplication of these noncoding regions occurred in an ancestral Loligo mt genome. Comparison of the gene arrangements of Loligo, Katharina tunicata, and Littorina saxatilis mt genomes revealed that 17 tRNA genes of the Loligo mt genome are adjacent to noncoding regions. A majority (15 tRNA genes) of their counterparts is found in two tRNA gene clusters of the Katharina mt genome. Therefore, the Loligo mt genome (17 tRNA genes) may have spread over the genome, and this may have been coupled with the multiplication of the noncoding regions. Maximum likelihood analysis of mt protein genes supports the clade Mollusca + Annelida + Brachiopoda but fails to infer the relationships among Katharina, Loligo, and three gastropod species.
AB - We previously reported the sequence of a 9260-bp fragment of mitochondrial (mt) DNA of the cephalopod Loligo bleekeri [J. Sasuga et al. (1999) J. Mol. Evol. 48:692-702]. To clarify further the characteristics of Loligo mtDNA, we have sequenced an 8148-bp fragment to reveal the complete mt genome sequence. Loligo mtDNA is 17,211 bp long and possesses a standard set of metazoan mt genes. Its gene arrangement is not identical to any other metazoan mt gene arrangement reported so far. Three of the 19 noncoding regions longer than 10 bp are 515, 507, and 509 bp long, and their sequences are nearly identical, suggesting that multiplication of these noncoding regions occurred in an ancestral Loligo mt genome. Comparison of the gene arrangements of Loligo, Katharina tunicata, and Littorina saxatilis mt genomes revealed that 17 tRNA genes of the Loligo mt genome are adjacent to noncoding regions. A majority (15 tRNA genes) of their counterparts is found in two tRNA gene clusters of the Katharina mt genome. Therefore, the Loligo mt genome (17 tRNA genes) may have spread over the genome, and this may have been coupled with the multiplication of the noncoding regions. Maximum likelihood analysis of mt protein genes supports the clade Mollusca + Annelida + Brachiopoda but fails to infer the relationships among Katharina, Loligo, and three gastropod species.
KW - Cephalopod Loligo bleekeri
KW - Gene rearrangement
KW - Mitochondrial DNA
KW - Molluscan phylogeny
KW - Noncoding region
KW - tRNA
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U2 - 10.1007/s00239-001-0039-4
DO - 10.1007/s00239-001-0039-4
M3 - Article
C2 - 11956687
AN - SCOPUS:0036218106
VL - 54
SP - 486
EP - 500
JO - Journal of Molecular Evolution
JF - Journal of Molecular Evolution
SN - 0022-2844
IS - 4
ER -