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Evolution of multipartite mitochondrial genomes in the booklice of the genus Liposcelis (Psocoptera).

Chen SC, Wei DD, Shao R, Shi JX, Dou W, Wang JJ - BMC Genomics (2014)

Bottom Line: We found that these two species of booklice also have multipartite mt genomes, like L. bostrychophila, with the mt genes we identified on two chromosomes.Numerous pseudo mt genes and non-coding regions were found in the mt genomes of these two booklice, and account for 30% and 10% respectively of the entire length we sequenced.L. entomophila and L. paeta differ substantially from each other and from L. bostrychophila in gene content and gene arrangement in their mt chromosomes.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, P, R, China. jjwang7008@yahoo.com.

ABSTRACT

Background: The genus Liposcelis (Psocoptera: Troctomorpha) has more than 120 species with a worldwide distribution and they pose a risk for global food security. The organization of mitochondrial (mt) genomes varies between the two species of booklice investigated in the genus Liposcelis. Liposcelis decolor has its mt genes on a single chromosome, like most other insects; L. bostrychophila, however, has a multipartite mt genome with genes on two chromosomes.

Results: To understand how multipartite mt genome organization evolved in the genus Liposcelis, we sequenced the mt genomes of L. entomophila and L. paeta in this study. We found that these two species of booklice also have multipartite mt genomes, like L. bostrychophila, with the mt genes we identified on two chromosomes. Numerous pseudo mt genes and non-coding regions were found in the mt genomes of these two booklice, and account for 30% and 10% respectively of the entire length we sequenced. In L. bostrychophila, the mt genes are distributed approximately equally between the two chromosomes. In L. entomophila and L. paeta, however, one mt chromosome has most of the genes we identified whereas the other chromosome has largely pseudogenes and non-coding regions. L. entomophila and L. paeta differ substantially from each other and from L. bostrychophila in gene content and gene arrangement in their mt chromosomes.

Conclusions: Our results indicate unusually fast evolution in mt genome organization in the booklice of the genus Liposcelis, and reveal different patterns of mt genome fragmentation among L. bostrychophila, L. entomophila and L. paeta.

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Phylogeny from Psocodea mitochondrial genome sequences. Numbers above the left branches show ML bootstrap support values for the phylogenies from nucleotide sequences, the right from amino acid sequences. Only support above 50% is shown. The insects belong to Phthiraptera and Psocoptera are shown in blue and orange frames, respectively. The circles besides names are a schematic representation of the mitochondrial genome organization.
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Fig6: Phylogeny from Psocodea mitochondrial genome sequences. Numbers above the left branches show ML bootstrap support values for the phylogenies from nucleotide sequences, the right from amino acid sequences. Only support above 50% is shown. The insects belong to Phthiraptera and Psocoptera are shown in blue and orange frames, respectively. The circles besides names are a schematic representation of the mitochondrial genome organization.

Mentions: We analyzed the mt genome sequences with maximum likelihood (ML) method to infer the phylogenetic relationship of L. entomophila, L. paeta, L. bostrychophila, L. decolor and with other species of Psocodea (FigureĀ 6). In the phylogenetic tree, the four Liposcelis species were clustered together with strong support (100% bootstrap values). Within the genus Liposcelis, L. paeta formed a clade with L. bostrychophila; these two species, which were from group D [18], were most closely related to L. entomophila (group A).Figure 6


Evolution of multipartite mitochondrial genomes in the booklice of the genus Liposcelis (Psocoptera).

Chen SC, Wei DD, Shao R, Shi JX, Dou W, Wang JJ - BMC Genomics (2014)

Phylogeny from Psocodea mitochondrial genome sequences. Numbers above the left branches show ML bootstrap support values for the phylogenies from nucleotide sequences, the right from amino acid sequences. Only support above 50% is shown. The insects belong to Phthiraptera and Psocoptera are shown in blue and orange frames, respectively. The circles besides names are a schematic representation of the mitochondrial genome organization.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4197233&req=5

Fig6: Phylogeny from Psocodea mitochondrial genome sequences. Numbers above the left branches show ML bootstrap support values for the phylogenies from nucleotide sequences, the right from amino acid sequences. Only support above 50% is shown. The insects belong to Phthiraptera and Psocoptera are shown in blue and orange frames, respectively. The circles besides names are a schematic representation of the mitochondrial genome organization.
Mentions: We analyzed the mt genome sequences with maximum likelihood (ML) method to infer the phylogenetic relationship of L. entomophila, L. paeta, L. bostrychophila, L. decolor and with other species of Psocodea (FigureĀ 6). In the phylogenetic tree, the four Liposcelis species were clustered together with strong support (100% bootstrap values). Within the genus Liposcelis, L. paeta formed a clade with L. bostrychophila; these two species, which were from group D [18], were most closely related to L. entomophila (group A).Figure 6

Bottom Line: We found that these two species of booklice also have multipartite mt genomes, like L. bostrychophila, with the mt genes we identified on two chromosomes.Numerous pseudo mt genes and non-coding regions were found in the mt genomes of these two booklice, and account for 30% and 10% respectively of the entire length we sequenced.L. entomophila and L. paeta differ substantially from each other and from L. bostrychophila in gene content and gene arrangement in their mt chromosomes.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, P, R, China. jjwang7008@yahoo.com.

ABSTRACT

Background: The genus Liposcelis (Psocoptera: Troctomorpha) has more than 120 species with a worldwide distribution and they pose a risk for global food security. The organization of mitochondrial (mt) genomes varies between the two species of booklice investigated in the genus Liposcelis. Liposcelis decolor has its mt genes on a single chromosome, like most other insects; L. bostrychophila, however, has a multipartite mt genome with genes on two chromosomes.

Results: To understand how multipartite mt genome organization evolved in the genus Liposcelis, we sequenced the mt genomes of L. entomophila and L. paeta in this study. We found that these two species of booklice also have multipartite mt genomes, like L. bostrychophila, with the mt genes we identified on two chromosomes. Numerous pseudo mt genes and non-coding regions were found in the mt genomes of these two booklice, and account for 30% and 10% respectively of the entire length we sequenced. In L. bostrychophila, the mt genes are distributed approximately equally between the two chromosomes. In L. entomophila and L. paeta, however, one mt chromosome has most of the genes we identified whereas the other chromosome has largely pseudogenes and non-coding regions. L. entomophila and L. paeta differ substantially from each other and from L. bostrychophila in gene content and gene arrangement in their mt chromosomes.

Conclusions: Our results indicate unusually fast evolution in mt genome organization in the booklice of the genus Liposcelis, and reveal different patterns of mt genome fragmentation among L. bostrychophila, L. entomophila and L. paeta.

Show MeSH
Related in: MedlinePlus