Gene rearrangements in gekkonid mitochondrial genomes with shuffling, loss, and reassignment of tRNA genes

BMC Genomics

Yasuyuki Hashiguchi¹  Chiemi Yamada²  Saaya Miura²  Yoshinori Kumazawa² 

[1] Department of Biology, Osaka Medical College, Takatsuki, Japan;Department of Information and Biological Sciences and Research Center for Biological Diversity, Graduate School of Natural Sciences, Nagoya City University, 1 Yamanohata, Mizuho-cho, Mizuho-ku, Nagoya 467-8501, Japan

关键词: Pseudogene;    tRNA;    Gene rearrangement;    Mitochondrial DNA;    Gecko;   

Others  :  1128427
DOI  :  10.1186/1471-2164-15-930

 received in 2014-06-08, accepted in 2014-10-13,  发布年份 2014

【 摘 要 】

Background

Vertebrate mitochondrial genomes (mitogenomes) are 16–18 kbp double-stranded circular DNAs that encode a set of 37 genes. The arrangement of these genes and the major noncoding region is relatively conserved through evolution although gene rearrangements have been described for diverse lineages. The tandem duplication-random loss model has been invoked to explain the mechanisms of most mitochondrial gene rearrangements. Previously reported mitogenomic sequences for geckos rarely included gene rearrangements, which we explore in the present study.

Results

We determined seven new mitogenomic sequences from Gekkonidae using a high-throughput sequencing method. The Tropiocolotes tripolitanus mitogenome involves a tandem duplication of the gene block: tRNA^Arg, NADH dehydrogenase subunit 4L, and NADH dehydrogenase subunit 4. One of the duplicate copies for each protein-coding gene may be pseudogenized. A duplicate copy of the tRNA^Arg gene appears to have been converted to a tRNA^Gln gene by a C to T base substitution at the second anticodon position, although this gene may not be fully functional in protein synthesis. The Stenodactylus petrii mitogenome includes several tandem duplications of tRNA^Leu genes, as well as a translocation of the tRNA^Ala gene and a putative origin of light-strand replication within a tRNA gene cluster. Finally, the Uroplatus fimbriatus and U. ebenaui mitogenomes feature the apparent loss of the tRNA^Glu gene from its original position. Uroplatus fimbriatus appears to retain a translocated tRNA^Glu gene adjacent to the 5’ end of the major noncoding region.

Conclusions

The present study describes several new mitochondrial gene rearrangements from Gekkonidae. The loss and reassignment of tRNA genes is not very common in vertebrate mitogenomes and our findings raise new questions as to how missing tRNAs are supplied and if the reassigned tRNA gene is fully functional. These new examples of mitochondrial gene rearrangements in geckos should broaden our understanding of the evolution of mitochondrial gene arrangements.

【 授权许可】

   
2014 Kumazawa et al.; licensee BioMed Central Ltd.

【 图 表 】

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