Abstract：
:The gene content of a mitochondrial (mt) genome, i.e., 37 genes and a large noncoding region (LNR), is usually conserved in Metazoa. The arrangement of these genes and the LNR is generally conserved at low taxonomic levels but varies substantially at high levels. We report here a variation in mt gene content and gene arrangement among chigger mites of the genus Leptotrombidium. We found previously that the mt genome of Leptotrombidium pallidum has an extra gene for large-subunit rRNA (rrnL), a pseudo-gene for small-subunit rRNA (PrrnS), and three extra LNRs, additional to the 37 genes and an LNR typical of Metazoa. Further, the arrangement of mt genes of L. pallidum differs drastically from that of the hypothetical ancestor of the arthropods. To find to what extent the novel gene content and gene arrangement occurred in Leptotrombidium, we sequenced the entire or partial mt genomes of three other species, L. akamushi, L. deliense, and L. fletcheri. These three species share the arrangement of all genes with L. pallidum, except trnQ (for tRNA-glutamine). Unlike L. pallidum, however, these three species do not have extra rrnL or PrrnS and have only one extra LNR. By comparison between Leptotrombidium species and the ancestor of the arthropods, we propose that (1) the type of mt genome present in L. pallidum evolved from the type present in the other three Leptotrombidium species, and (2) three molecular mechanisms were involved in the evolution of mt gene content and gene arrangement in Leptotrombidium species.
journal_name
J Mol Evoljournal_title
Journal of molecular evolutionauthors
Shao R,Barker SC,Mitani H,Takahashi M,Fukunaga Mdoi
10.1007/s00239-005-0196-ysubject
Has Abstractpub_date
2006-08-01 00:00:00pages
251-61issue
2eissn
0022-2844issn
1432-1432journal_volume
63pub_type
杂志文章abstract：:It is generally considered that if an RNA World ever existed that it would be driven by an RNA capable of RNA replication. Whether such a catalytic RNA could emerge in an RNA World or not, there would need to be prior routes to increasing complexity in order to produce it. It is hypothesized here that increasing seque...
journal_title：Journal of molecular evolution
pub_type： 杂志文章
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journal_title：Journal of molecular evolution
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pub_type： 杂志文章
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pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：2018-07-01 00:00:00
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更新日期：2008-12-01 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
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更新日期：1996-04-01 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
doi：10.1007/BF01796121
更新日期：1976-12-31 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
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更新日期：1987-01-01 00:00:00
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journal_title：Journal of molecular evolution
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pub_type： 杂志文章
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更新日期：1997-12-01 00:00:00
