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Article

First Report on Mitochondrial Gene Rearrangement in Non-Biting Midges, Revealing a Synapomorphy in Stenochironomus Kieffer (Diptera: Chironomidae)

by
Chen-Guang Zheng
1,
Zheng Liu
2,
Yan-Min Zhao
3,
Yang Wang
4,
Wen-Jun Bu
1,
Xin-Hua Wang
1 and
Xiao-Long Lin
1,*
1
College of Life Sciences, Nankai University, Tianjin 300071, China
2
Geological Museum of China, Beijing 100083, China
3
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
4
Department of Plant Protection, College of Horticulture and Landscape, Tianjin Agricultural University, Tianjin 300392, China
*
Author to whom correspondence should be addressed.
Insects 2022, 13(2), 115; https://doi.org/10.3390/insects13020115
Submission received: 26 November 2021 / Revised: 20 January 2022 / Accepted: 20 January 2022 / Published: 21 January 2022
(This article belongs to the Section Insect Systematics, Phylogeny and Evolution)
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Abstract

:

Simple Summary

Gene rearrangement is an additional type of data to support relationships of taxa, with rearrangement synapomorphies identified across multiple orders and at many different taxonomic levels. The concept to use mitochondrial gene rearrangements as phylogenetic markers has been proposed since the mid-1980s, the synapomorphic gene rearrangements have been identified from many lineages. However, mitochondrial gene rearrangement has never been observed in the non-biting midges (Diptera: Chironomidae). Here, seven new mitogenomes of the genus Stenochironomus were sequenced and analyzed. Coupled with published data, phylogenetic analyses were performed within Chironominae. The present study showed that mitogenomes of Stenochironomus are showing a higher A+T bias than other chironomid species. A synapomorphic gene rearrangement that the gene order rearranges from trnI-trnQ-trnM to trnI-trnM-trnQ was identified within Stenochironomus, which is the first instance of mitochondrial gene rearrangement discovered in the Chironomidae. The monophyly of the genus Stenochironomus was strongly supported by mitogenomes. Our study provides new insights into the mitochondrial gene order of Chironomidae, and provides a valuable resource for understanding synapomorphic gene rearrangements.

Abstract

(1) Background: Gene rearrangement of mitochondrial genome, especially those with phylogenetic signals, has long fascinated evolutionary biologists. The synapomorphic gene rearrangements have been identified across multiple orders and at many different taxonomic levels, supporting the monophyletic or systematic relationships of related lineages. However, mitochondrial gene rearrangement has never been observed in the non-biting midges (Diptera: Chironomidae); (2) methods: in this study, the complete mitogenomes of seven Stenochironomus species were sequenced and analyzed for the first time; (3) results: each mitogenome of Stenochironomus contains 37 typical genes and a control region. The whole mitogenomes of Stenochironomus species exhibit a higher A+T bias than other published chironomid species. The gene order rearranges from trnI-trnQ-trnM to trnI-trnM-trnQ in all the seven mitogenomes of Stenochironomus, which might be act as a synapomorphy of the genus, supporting the monophyletic of Stenochironomus species. In addition, another derived gene cluster: trnA-trnG-ND3-trnR exists in Stenochironomus tobaduodecimus. The derived gene orders described above are the first case of mitochondrial gene rearrangement in Chironomidae. Coupled with published data, phylogenetic relationships were reconstructed within Chironominae, and strongly supported the monophyly of Stenochironomus; (4) conclusions: our study provides new insights into the mitochondrial gene order of Chironomidae, and provides a valuable resource for understanding the synapomorphic gene rearrangements.

1. Introduction

Gene rearrangement of mitochondrial genome (mitogenome) has long fascinated evolutionary biologists, and insects are one of the most studied organisms [1,2,3]. The typical mitogenome of insect is a 14–20 kb circular molecule, containing 37 genes (13 protein-coding genes, two ribosomal RNA genes, and 22 transfer RNA genes) and a control region on a single chromosome [4] characterized by the small genome size, maternal inheritance, low sequence recombination, and fast evolution rates [1,5,6]. Benefited by the high-throughput sequencing technology, nucleotide sequences of mitogenomes are now widely used in phylogenetic and evolutionary studies [7,8,9]. Besides, gene rearrangement is an additional type of data to support relationships of taxa, with rearrangement synapomorphies identified across multiple orders and at many different taxonomic levels [1,10,11]. Since the concept of using mitochondrial gene rearrangements as phylogenetic markers has been proposed in the mid-1980s [3], the synapomorphic gene rearrangements have been identified in many taxa, supporting the monophyletic or systematic relationships of related lineages [9,12,13]. In insect mitogenomes, patterns of gene arrangement are usually conserved within lineages [6], but gene rearrangements have also been observed involving tRNA and PCG within many orders, such as Blattodea [14], Ephemeroptera [15,16], Hemiptera [17,18], Hymenoptera [12,19], Lepidoptera [20], Mantodea [21,22], Orthoptera [23,24], Phthiraptera [25], Psocoptera [9], and Thysanoptera [26]. For the mitogenomes of Diptera, gene rearrangements have been detected within several families, e.g., Calliphoridae [27], Cecidomyiidae [28], and Mycetophilidae [29]. Published mitogenome data of Chironomid are relatively rare compared with other insects of Diptera. Previous studies have focused on the genome organization and the application of nucleotide sequence information in phylogenetic analysis [30,31,32,33,34,35,36,37]. However, mitochondrial gene rearrangement has never been reported in the Dipteran family Chironomidae. In the current study, we found mitochondrial gene rearrangements in the genus Stenochironomus Kieffer for the first time in Chironomidae. Stenochironomus is species-diverse, and occurs in all zoogeographic regions except Antarctica, with more than 100 named species [38]. The larvae of Stenochironomus (Figure 1) are found mining leaves or immersed wood in standing and flowing waters [38]. Due to its strictly mining habit which contributes to decomposition of wood, leaves, and aquatic macrophytes, Stenochironomus is regarded as important bioindicator in freshwater ecosystems [39,40,41].
Prior to this study, the mitogenomic characteristics of Stenochironomus have never been studied. We sequenced and annotated the complete mitogenomes of seven species of Stenochironomus. The mitogenomic organization, evolutionary rates, and gene rearrangement pattern within Stenochironomus were revealed. Coupled with published data, phylogenetic relationships of Chironominae were reconstructed based on mitogenomes to explore the monophyly of Stenochironomus.

2. Materials and Methods

2.1. Taxon Sampling and DNA Extraction

Seven species of Stenochironomus were used for mitogenome sequencing (Table 1). Specimens were preserved in ethanol (85% for adults, 95% for immature) and stored in a freezer at −20 °C in the College of Life Sciences at Nankai University (Tianjin, China). The total genomic DNA was the extracted thorax of adult and larva using a Qiagen DNA Blood and Tissue Kit (Qiagen, Hilden, Germany) following the manufacturer’s protocol. The DNA and vouchers of the species are deposited at the College of Life Sciences, Nankai University, Tianjin, China.

2.2. Sequencing and Mitogenome Assembly

Whole mitogenomes were sequenced individually using the Illumina NovaSeq 6000 platform with a 350-bp insert size and a paired-end 150-bp sequencing strategy at Novogene Co., Ltd. (Beijing, China). Adapter sequences and low-quality reads were trimmed with Trimmomatic 0.36 [43], and finally about two Gb of clean data were obtained for each sample. A de novo assembly was performed using IDBA-UD [44] with minimum and maximum k values of 40 and 120 bp, respectively. The partial COI sequence for each species was downloaded from GenBank, and served as the “bait” reference to acquire the targeted mitogenome sequence from the pooled sequencing file. To check the accuracy of the assembly, clean reads were mapped onto the obtained mitogenome sequences using Geneious 2020.2.1 [45].

2.3. Genome Annotation and Sequence Analyses

The MITOS2 webserver (available at http://mitos2.bioinf.uni-leipzig.de/index.py, access on 24 May 2021) was used to identify transfer RNA (tRNA) genes based on the invertebrate mitochondrial genetic code. Protein coding genes (PCGs) and ribosomal RNA (rRNA) genes were annotated by aligning with homologous regions of other published chironomid mitogenomes using Geneious 2020.2.1. Newly sequenced mitogenomes were submitted to GenBank (accession numbers: OL742440, OL742441, OL753645–753649). The CG View server V 1.0 [46] was used to draw the mitogenome maps. Nucleotide compositions of the whole mitogenome and individual genes were calculated by MEGA X [47]. The bias of the nucleotide composition was measured by AT-skew [(A-T)/(A+T)] and GC-skew [(G-C)/(G+C)]. The codon usage of PCGs were computed by MEGA. The non-synonymous substitution rate (Ka) and synonymous substitution rate (Ks) of PCGs were calculated with DnaSP 6.12.03 [48].

2.4. Phylogenetic Analyses

Phylogenetic analyses were conducted using the seven newly sequenced Stenochironomus mitogenomes and five Chironominae species available in GenBank as ingroup taxa (Table 1). One Orthocladiinae species (Rheocricotopus villiculus) was chosen as an outgroup. Individual genes of PCGs were aligned using muscle implemented in MEGA based on amino acid sequences, and then concatenated using SequenceMatrix v1.7.8 [49]. A total of three datasets were prepared for phylogenetic analyses: PCG123 (all three codon positions of the 13 PCGs), PCG12 (the 1st and 2nd codon positions of the 13 PCGs), and AA (amino acid sequences of the 13 PCGs). PartitionFinder 2.0 [50] was used to select the best partitioning scheme and best-fit substitution model. Bayesian inference (BI) and maximum likelihood (ML) methods were used for phylogenetic analyses. BI analysis was conducted using MrBayes 3.2.7a [51] with substitution model in Supplementary Table S1. Two simultaneous Markov chain Monte Carlo (MCMC) runs of 10,000,000 generations were conducted, trees were sampled every 1000 generations and the first 25% of trees discarded as burn-in. The convergence of runs was checked using Tracer 1.7 [52]. The ML analysis was performed using IQ-TREE 1.6.10 [53] with the best-fit substitution model and 1000 bootstrap replicates.

3. Results and Discussion

3.1. General Features of Stenochironomus Mitogenomes

Seven mitogenomes of Stenochironomus were newly sequenced with the length range from 17,694 bp in Stenochironomus sp. 2CZ to 18,759 bp in Stenochironomus tobaduodecimus (Figure 2). Among them, the control regions of Stenochironomus gibbus and Stenochironomus sp. 2CZ failed to complete sequencing due to the complicated structure and high AT content. The entire length of mitogenomes of the Stenochironomus species is larger than other published chironomid species, mainly due to the large number of intergenic spacers [30,31,32,33]. Each mitogenome of Stenochironomus contains 37 typical genes (13 PCGs, two rRNAs, and 22 tRNAs) and one control region. Among these genes, four PCGs, eight tRNAs, and two rRNAs are coded on the minority strand (N strand), while the other genes are coded on the majority strand (J strand) (Figure 2).
The whole mitogenomes of Stenochironomus are significantly biased toward A and T with the A+T content range from 81.7% in Stenochironomus tobaduodecimus and Stenochironomus sp. 1CZ to 83.6% in Stenochironomus sp. 3CZ (Table 2), showing a stronger A+T bias than other chironomid species [30,31,32,33]. Among the mitogenomes of Stenochironomus, the 3rd codon of PCGs and the control region exhibit the highest A+T content while the 1st and 2nd codons of PCGs have the lowest A+T content (Table 2). The whole mitogenomes of all the seven Stenochironomus species exhibit positive AT-skew (0.01 to 0.02) and negative GC-skew (−0.34 to −0.21), except for Stenochironomus tobaduodecimus and Stenochironomus zhengi (Table 2).
Most PCGs in Stenochironomus mitogenomes initiate with a standard start codon ATN (N represents one of four nucleotides, A, T, C, G). While the start codon of COI is TTG in Stenochironomus zhengi and Stenochironomus sp. 1CZ. The start codon of ND5 in Stenochironomus zhengi, Stenochironomus sp. 1CZ, and Stenochironomus sp. 3CZ is GTG (Supplementary Table S2). All PCGs in Stenochironomus mitogenomes end with TAA or TAG as the termination codon (Supplementary Table S2). The total codon numbers, except the termination codons among Stenochironomus mitogenomes range from 3707 in Stenochironomus sp. 1CZ to 3716 in Stenochironomus sp. 3CZ (Supplementary Table S3). The highest and lowest frequent codon families are Phe and Cys, respectively (Supplementary Figure S1), which is congruent with those of previously published chironomid species [32,33,34,35]. The Ka/Ks value (ω) is used to test for signatures of natural selection. The ω value of all PCGs in Stenochironomus mitogenomes is less than 1 (Figure 3), suggesting that they are under purifying selection. ND6 exhibits the highest ω value among the 13 PCGs of Stenochironomus mitogenomes (Figure 3), while ATP8 evolves at the fastest rate in previously published chironomid species [32,33].
Each mitogenome of Stenochironomus contains 22 typical tRNA genes, with A+T content ranging from 83.4% to 85.1% (Table 2). The nucleotide skew of tRNA genes among Stenochironomus mitogenomes is consistent, the concatenated tRNA genes exhibit a positive AT-skew, and negative GC-skew (Table 2). The A+T content of 12S rRNA and 16S rRNA genes range from 86.1% to 89.4%, and 87.2% to 89.4%, respectively. The 12S rRNA exhibits a negative AT-skew and negative GC-skew, while the 16S rRNA exhibits a positive AT-skew and negative GC-skew in most Stenochironomus mitogenomes (Table 2).

3.2. Gene Rearrangement

The gene arrangement of mitogenomes is conservative in most groups of Diptera [30,54,55,56]. New gene orders have only been reported in a few taxa, for example: The trnI gene inverted and transposed from the position between the control region and the ND2 gene to the block of tRNA genes between ND3 and ND5 in two gall midges [28], and the midge Arachnocampa flava has an inversion of the trnE gene [30]. Prior to this study, no examples of gene rearrangement were reported from mitogenomes of non-biting midge species. The gene order rearranges from trnI-trnQ-trnM to trnI-trnM-trnQ in all the seven Stenochironomus mitogenomes and the trnA gene moves to upstream, forming a new gene cluster: trnA-trnG-ND3-trnR in Stenochironomus tobaduodecimus (Figure 4), which is the first instance of mitochondrial gene rearrangement discovered in Chironomidae. Previous studies have shown that gene rearrangement can act as a synapomorphy and be shared within different taxonomic levels [1,11,57,58]. In this study, the gene rearrangement (trnI-trnM-trnQ) is discovered in all the seven Stenochironomus mitogenomes, which might act as a synapomorphy of the genus, supporting the monophyletic of the Stenochironomus species.
In the insect mitogenome, the gene cluster trnI-trnM-trnQ is one of the regions with the highest probability of gene rearrangement. Many gene rearrangement events related to this region have been reported, including gene duplication [2,20,59], and gene translocation [21,60]. The derived gene order trnI-trnM-trnQ, same as in this study have been observed in 14 species belonging to 5 different orders in previous studies [2]. The gene cluster trnI-trnM-trnQ is adjacent to the control region of mitogenome, and transcription of the entire mitogenome starts from this region. The probability of rearrangement may be higher at the beginning of transcription [1,2,11]. The six-tRNA gene cluster trnA-trnR-trnN-trnS-trnE-trnF is also a gene rearrangement the hotspot region. Cases of gene rearrangement in this region have been reported in many different orders of insects [1,2].

3.3. Phylogenetic Relationships

The phylogenetic analyses were performed based on the concatenated nucleotide sequences of 13 PCGs. All phylogenetic trees based on different datasets show that the seven Stenochironomus species form a monophyletic group with strong support (Figure 5 and Supplementary Figures S2–S4). Our study reveals that the mitogenomes of Stenochironomus are useful for phylogenetic inference. Although mitogenomes have poor phylogenetic signals at the subfamily level of Chironomidae [33], mitogenomes are still useful for phylogeny at the genus level within Chironomidae according to the present and recent studies [32].

4. Conclusions

In this study, seven new mitogenomes of the genus Stenochironomus were sequenced and analyzed. Coupled with published data, phylogenetic analyses were performed within Chironominae. The present study showed that mitogenomes of Stenochironomus show a higher A and T bias than other chironomid species. A synapomorphic gene rearrangement that the gene order rearranges from trnI-trnQ-trnM to trnI-trnM-trnQ was identified within Stenochironomus, which is the first instance of mitochondrial gene rearrangement discovered in Chironomidae. The monophyly of the genus Stenochironomus was strongly supported by mitogenomes.

Supplementary Materials

The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/insects13020115/s1, Supplementary Table S1: The best model for each partition of the three datasets. Supplementary Table S2: Start and stop codons of PCGs among the seven Stenochironomus mitogenomes. Supplementary Table S3: Total number of codons of the seven Stenochironomus mitogenomes. Supplementary Figure S1: Patterns of codon usage of the seven Stenochironomus mitogenomes. The X-axis shows the codon families and the Y-axis shows the total codons. Supplementary Figure S2: Phylogenetic relationships of Chironominae based on AA. Numbers at the nodes are ML bootstrap values. Supplementary Figure S3: Phylogenetic relationships of Chironominae based on PCG12. Numbers at the nodes are BI posterior probabilities and ML bootstrap values. Supplementary Figure S4: Phylogenetic relationships of Chironominae based on PCG123. Numbers at the nodes are BI posterior probabilities and ML bootstrap values.

Author Contributions

X.-L.L. and C.-G.Z. conceived the research. X.-L.L. collected samples. Y.-M.Z. performed laboratory work. Y.W. and C.-G.Z. conducted analyses. X.-L.L. and C.-G.Z. drafted the manuscript. Z.L., W.-J.B. and X.-H.W. revised the manuscript. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by the National Natural Science Foundation of China, grant number 31900344, 41502021, China Postdoctoral Science Foundation Grant, grant number 2018M640227, and Technological Innovation Talent Training Project of the Ministry of Natural Resources of China, grant number 12110600000018003910.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

The following information was supplied regarding the availability of DNA sequences: The new mitogenomes of Stenochironomus gibbus, Stenochironomus okialbus, Stenochironomus sp. 1CZ, Stenochironomus sp. 2CZ, Stenochironomus sp. 3CZ, Stenochironomus tobaduodecimus, Stenochironomus zhengi are deposited in GenBank of NCBI under accession numbers OL742440, OL753645, OL753646, OL742441, OL753647, OL753648 and OL753649, respectively.

Acknowledgments

We would like to thank three anonymous reviewers for their suggestions and comments. We sincerely thank Xin Duan for giving assistance in software analysis.

Conflicts of Interest

The authors declare no conflict of interest.

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Insects 13 00115 g001 550
Figure 1. Larva of Stenochironomus okialbus in immersed wood from Zhejiang, China.
Figure 1. Larva of Stenochironomus okialbus in immersed wood from Zhejiang, China.
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Insects 13 00115 g002 550
Figure 2. Mitogenome maps of the represented species of Stenochironomus. The names of PCGs and rRNAs are indicated by standard abbreviations, while names of tRNAs are represented by a single letter abbreviation. The first circle shows the gene arrangement and arrows indicate the orientation of gene transcription. Red, blue, green, and yellow arrows refer to PCGs, rRNAs, tRNAs, and the control region, respectively. The second circle indicates the GC content, which is plotted as the deviation from the average GC content of the entire sequence. The third circle shows the GC-skew, which is plotted as the deviation from the average GC-skew of the entire sequence. The innermost circle shows the sequence length.
Figure 2. Mitogenome maps of the represented species of Stenochironomus. The names of PCGs and rRNAs are indicated by standard abbreviations, while names of tRNAs are represented by a single letter abbreviation. The first circle shows the gene arrangement and arrows indicate the orientation of gene transcription. Red, blue, green, and yellow arrows refer to PCGs, rRNAs, tRNAs, and the control region, respectively. The second circle indicates the GC content, which is plotted as the deviation from the average GC content of the entire sequence. The third circle shows the GC-skew, which is plotted as the deviation from the average GC-skew of the entire sequence. The innermost circle shows the sequence length.
Insects 13 00115 g002
Insects 13 00115 g003 550
Figure 3. Evolution rate of each PCG of the seven Stenochironomus mitogenomes. Ka refers to non-synonymous substitution rate, Ks refers to synonymous substitution rate, Ka/Ks refers to evolution rate of each PCG.
Figure 3. Evolution rate of each PCG of the seven Stenochironomus mitogenomes. Ka refers to non-synonymous substitution rate, Ks refers to synonymous substitution rate, Ka/Ks refers to evolution rate of each PCG.
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Insects 13 00115 g004 550
Figure 4. Gene rearrangement of Stenochironomus mitogenomes. The names of PCGs are indicated by standard abbreviations and the names of tRNAs are represented by a single letter abbreviation.
Figure 4. Gene rearrangement of Stenochironomus mitogenomes. The names of PCGs are indicated by standard abbreviations and the names of tRNAs are represented by a single letter abbreviation.
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Insects 13 00115 g005 550
Figure 5. Phylogenetic tree of Chironominae based on dataset AA. Numbers at the nodes are BI.
Figure 5. Phylogenetic tree of Chironominae based on dataset AA. Numbers at the nodes are BI.
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Table
Table 1. Taxonomic information, sampling metadata, GenBank accession numbers and references of mitochondrial genomes used in the study.
Table 1. Taxonomic information, sampling metadata, GenBank accession numbers and references of mitochondrial genomes used in the study.
Sample IDSubfamilyGenusSpeciesSampling MetadataLife StageAccession NoReference
ZJ497OrthocladiinaeRheocricotopusRheocricotopus villiculusTianmu Mountain National Nature Reserve, Hangzhou, Zhejiang, China, 30.3222° N, 119.442° E, 22-July-2019, leg. X.-L. LinAdult maleMW373526[33]
CNUISI-020005203ChironominaeChironomusChironomus flaviplumusYeondeung stream, Yeosu, South Korea 34°45′26.0″ N, E 127°42′51.2″ E, May-2020LarvaMW770891[42]
JN861749ChironominaeChironomusChironomus tepperiNANAJN861749[30]
XL3993ChironominaeMicrochironomusMicrochironomus tabaruiHengshui, Hebei, China, 37.651626° N, 115.650831° E, 1-September-2020Adult maleMZ261913[35]
BSZ13ChironominaePolypedilumPolypedilum unifasciumLishui, Zhejiang, China, 27°45′16″ N, 119°11′15″ E, August-2020LarvaMW677959[34]
KT251040ChironominaePolypedilumPolypedilum vanderplankirock pool, Nigeria, 11.088821° N, 7.734533° ENAKT251040[31]
XL690ChironominaeStenochironomusStenochironomus gibbusTrondheim, Norway, 63.4224° N, 10.3451° E, leg. X.-L. LinAdult maleOL742440Present study
ZJ761ChironominaeStenochironomusStenochironomus okialbusXianju, Taizhou, Zhejiang, 28.674° N, 120.600° E, November-2019, leg. X.-L. LinLarvaOL753645Present study
MYK13ChironominaeStenochironomusStenochironomus sp. 1CZZunyi, Guizhou, China, 27.834° N, 107.569° E, June-2020, leg. P.-P. LiAdult maleOL753646Present study
NLCH802ChironominaeStenochironomusStenochironomus sp. 2CZGanzhou, Jiangxi, China, 24.583° N, 114.446° E, August-2020, leg. X.-L. LinLarvaOL742441Present study
XL1244ChironominaeStenochironomusStenochironomus sp. 3CZFogong, Nujiang, Yunnan, China, 26.5533° N, 98.9203° E, May-2018, leg. X.-L. LinAdult maleOL753647Present study
XL1443ChironominaeStenochironomusStenochironomus tobaduodecimusLedong, Hainan, China, 18.6927° N, 108.7960° E, March-2016, leg. B.-J. SunAdult maleOL753648Present study
DWS114ChironominaeStenochironomusStenochironomus zhengiPingbian, Honghe, Yunnan, China, 22.913178° N, 103.695553° E, leg. L.-Z. MengAdult maleOL753649Present study
Table
Table 2. Nucleotide composition of mitochondrial genomes of the seven Stenochironomus species.
Table 2. Nucleotide composition of mitochondrial genomes of the seven Stenochironomus species.
SpeciesWhole GenomeProtein Coding Genes1st Codon Position2nd Codon Position3rd Codon PositiontRNA Genes12S rRNA16S rRNAControl Region
A+T%Stenochironomus gibbus82.678.073.069.591.583.888.189.397.6
Stenochironomus okialbus82.277.473.369.889.184.487.089.096.2
Stenochironomus tobaduodecimus81.777.072.070.288.783.987.388.194.9
Stenochironomus zhengi81.877.873.069.890.785.186.187.290.6
Stenochironomus sp. 1CZ81.777.572.669.990.083.486.187.597.0
Stenochironomus sp. 2CZ82.779.474.770.693.084.388.289.098.2
Stenochironomus sp. 3CZ83.679.075.170.391.784.489.789.495.2
AT-
Skew		Stenochironomus gibbus0.01−0.18−0.05−0.41−0.110.05−0.030.00−0.08
Stenochironomus okialbus0.01−0.19−0.08−0.42−0.100.02−0.090.01−0.17
Stenochironomus tobaduodecimus−0.01−0.18−0.05−0.41−0.100.03−0.06−0.04−0.09
Stenochironomus zhengi−0.02−0.21−0.08−0.41−0.150.02−0.080.000.06
Stenochironomus sp. 1CZ0.01−0.19−0.07−0.41−0.100.03−0.080.01−0.02
Stenochironomus sp. 2CZ0.01−0.18−0.08−0.41−0.090.05−0.060.01−0.11
Stenochironomus sp. 3CZ0.02−0.18−0.08−0.41−0.090.06−0.050.01−0.09
GC-
Skew		Stenochironomus gibbus−0.240.000.18−0.11−0.18−0.15−0.33−0.46−0.33
Stenochironomus okialbus−0.22−0.030.19−0.14−0.23−0.13−0.33−0.420.32
Stenochironomus tobaduodecimus−0.34−0.040.12−0.13−0.20−0.16−0.40−0.43−0.02
Stenochironomus zhengi−0.27−0.040.13−0.13−0.23−0.15−0.25−0.45−0.55
Stenochironomus sp. 1CZ−0.29−0.010.18−0.14−0.16−0.16−0.38−0.46−0.50
Stenochironomus sp. 2CZ−0.210.020.22−0.13−0.07−0.12−0.27−0.450.00
Stenochironomus sp. 3CZ−0.24−0.010.20−0.13−0.18−0.14−0.22−0.360.00
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Zheng, C.-G.; Liu, Z.; Zhao, Y.-M.; Wang, Y.; Bu, W.-J.; Wang, X.-H.; Lin, X.-L. First Report on Mitochondrial Gene Rearrangement in Non-Biting Midges, Revealing a Synapomorphy in Stenochironomus Kieffer (Diptera: Chironomidae). Insects 2022, 13, 115. https://doi.org/10.3390/insects13020115

AMA Style

Zheng C-G, Liu Z, Zhao Y-M, Wang Y, Bu W-J, Wang X-H, Lin X-L. First Report on Mitochondrial Gene Rearrangement in Non-Biting Midges, Revealing a Synapomorphy in Stenochironomus Kieffer (Diptera: Chironomidae). Insects. 2022; 13(2):115. https://doi.org/10.3390/insects13020115

Chicago/Turabian Style

Zheng, Chen-Guang, Zheng Liu, Yan-Min Zhao, Yang Wang, Wen-Jun Bu, Xin-Hua Wang, and Xiao-Long Lin. 2022. "First Report on Mitochondrial Gene Rearrangement in Non-Biting Midges, Revealing a Synapomorphy in Stenochironomus Kieffer (Diptera: Chironomidae)" Insects 13, no. 2: 115. https://doi.org/10.3390/insects13020115

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