Novel mitochondrial gene content and gene arrangement indicate illegitimate inter-mtDNA recombination in the chigger mite, Leptotrombidium pallidum

• Published in: Journal of molecular evolution Vol. 60; no. 6; pp. 764 - 773
• Main Authors: Shao, Renfu, Mitani, Harumi, Barker, Stephen C, Takahashi, Mamoru, Fukunaga, Masahito
• Format: Journal Article
• Language: English
• Published: Germany Springer Nature B.V 01-06-2005
• Subjects: Animals; Base Sequence; Cell Nucleus - metabolism; DNA, Mitochondrial - genetics; Evolution, Molecular; Genes; Genome; Humans; Leptotrombidium pallidum; Mites; Mitochondria - genetics; Models, Genetic; Molecular Sequence Data; Nucleic Acid Conformation; Phylogeny; Polymerase Chain Reaction; Recombination, Genetic; RNA, Ribosomal - genetics; RNA, Transfer - genetics; Sequence Analysis, DNA; Sequence Homology, Nucleic Acid; Transcription, Genetic
• ISSN: 0022-2844; 1432-1432
• DOI: 10.1007/s00239-004-0226-1

To better understand the evolution of mitochondrial (mt) genomes in the Acari (mites and ticks), we sequenced the mt genome of the chigger mite, Leptotrombidium pallidum (Arthropoda: Acari: Acariformes). This genome is highly rearranged relative to that of the hypothetical ancestor of the arthropods and the other species of Acari studied. The mt genome of L. pallidum has two genes for large subunit rRNA, a pseudogene for small subunit rRNA, and four nearly identical large noncoding regions. Nineteen of the 22 tRNAs encoded by this genome apparently lack either a T-arm or a D-arm. Further, the mt genome of L. pallidum has two distantly separated sections with identical sequences but opposite orientations of transcription. This arrangement cannot be accounted for by homologous recombination or by previously known mechanisms of mt gene rearrangement. The most plausible explanation for the origin of this arrangement is illegitimate inter-mtDNA recombination, which has not been reported previously in animals. In light of the evidence from previous experiments on recombination in nuclear and mt genomes of animals, we propose a model of illegitimate inter-mtDNA recombination to account for the novel gene content and gene arrangement in the mt genome of L. pallidum.