Mitochondrial Genome and Phylogeny of Bactrocera (B.) tuberculata
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摘要:
目的 明确瘤胫果实蝇[Bactrocera Bactrocera tuberculata (Bezzi) ]线粒体全基因组序列特征,探究其系统发育地位,为瘤胫果实蝇分子标记、物种鉴定和进化遗传学研究提供参考依据。 方法 采用高通量测序技术对瘤胫果实蝇的线粒体全基因组进行测序、组装、拼接和注释,获得基因组全序列,并对基因组基本结构进行分析;选择NCBI 公布的果实蝇属近缘种20种实蝇的线粒体全基因组序列,基于最大似然法(Maximum likelihood, ML)进行系统发育分析。 结果 瘤胫果实蝇线粒体基因组序列总长度为15 854 bp;具37个基因,其中包含13个蛋白编码基因、22个tRNA基因、2个rRNA基因和1个非编码控制基因。瘤胫果实蝇线粒体基因组全序列A+T含量为 73.2%;13个蛋白质编码基因共有密码子3 755个,在蛋白质所有22种氨基酸密码子中,UUA(leucine)的使用频率 N及相对密码子RSCU使用频率均最高,N(RSCU)为387(3.79);tRNA基因二级结构中,除苯丙氨酸(F)以及苏氨酸(T)缺少假尿嘧啶(T)环和丝氨酸(S1)缺少二氢尿嘧啶DHU环,其余19个tRNA基因均能折叠形成典型的三叶草二级结构,22个 tRNA基因中,共存在178处碱基对错配,错配碱基对均为G-U。通过对其近缘种线粒体全基因组的系统发育分析,瘤胫果实蝇与桔小实蝇(Bactrocera dorsalis)和杨桃实蝇(Bactrocera carambolae)聚在一起,表明3种实蝇的亲缘关系较近,与果实蝇亚属的其他种类聚在同个分支上,结果与形态鉴定一致。 结论 首次报道了瘤胫果实蝇线粒体全基因组,GenBank登录号MW 892726,测定和分析的瘤胫果实蝇线粒体基本结构特征,核苷酸组成、系统进化分析,支持瘤胫果实蝇属于果实蝇亚属,为物种诊断、进化生物学和防治研究提供依据。 Abstract:Objective Mitochondrial genome and phylogeny of Bactrocera (B.) tuberculata were studied for advancement on the molecular markers design, species identification, and evolutionary genetics relating to the destructive fruit fly. Methods High-throughput sequencing was applied to determine, assemble, join, and annotate the complete genome of B. (B.) tuberculata mitochondria. With the sequences on selected 20 species published on NCBI, the phylogeny of fruit flies was analyzed using the maximum likelihood method (ML). Results The total mitochondrial genome sequence was 15 854 bp long containing 13 protein coding genes, 22 tRNA genes, 2 rRNA genes, and one non-coding control gene with 73.2% A+T. There were 3 755 codons in the 13 protein-coding genes. Of the 22 amino acid codons in the protein, UUA (leucine) had the highest frequency (N) of 387 and relative codon (RSCU) of 3.79. Aside from the phenylalanine (F) and threonine (T) that lacked pseuduracine (T) rings and the serine (S1) without a dihydrouracil DHU ring, the secondary structures of the remaining 19 tRNA genes shaped typically like a canonical cloverleaf. And the 22 genes had 178 mismatched G-U base pairs. Based on the mitochondrial analysis, the phylogeny of B. (B.) tuberculate, B. (B.) dorsalis, and B. (B.) carambolae were closely related and in the same branch as other subgenera. The result agreed with what was revealed by the morphological observation. Conclusion For the first time, the complete mitochondrial genome of B. (B.) tuberculata was obtained with a GenBank accession number of MW 892726. The information secured on the structure and nucleotide composition of the mitochondria and the phylogenetic relation with other subgenera would aid further studies on the species identification, evolutionary biology, and pest control of the devastating pest. -
表 1 瘤胫果实蝇线粒体基因组特征
Table 1. Characteristics of mitochondrial genome of B. (B.) tuberculata
基因
Gene位置
Location/bp基因长度
Gene length/bp编码链
Strand
J(+)、N(-)基因间隔
Intergenic
sequence/bp起始密码子
Start
codon终止密码子
Stop
codontrnI-GAU 1~66 66 J trnQ-UUG 64~132 69 N −3 trnM-CAU 201~269 69 J 68 ND2 270~1292 1023 J 0 ATT TAA trnW-UCA 1303~1371 69 J 10 trnC-GCA 1364~1426 63 N −8 trnY-GUA 1473~1539 67 N 46 COX1 1538~3076 1539 J −2 TCG TAA trnL-UAA 3072~3137 66 J −5 COX2 3142~3831 690 J 4 ATG TAA trnK-CUU 3836~3906 71 J 4 trnD-GUC 3910~3976 67 J 2 ATP8 3977~4138 162 J 0 GTG TAA ATP6 4132~4809 678 J −7 ATG TAA COX3 4809~5597 789 J −1 ATG TAA trnG-UCC 5607~5671 65 J 9 ND3 5672~6025 354 J 0 ATT TAG trnA-UGC 6024~6088 65 J −2 trnR-UCG 6096~6159 64 J 7 trnN-GUU 6171~6235 65 J 11 trnS-GCU 6236~6303 68 J 0 trnE-UUC 6304~6370 67 J 0 trnF-GAA 6392~6456 65 N 21 ND5 6437~8176 1740 N −20 ATT TAG trnH-GUG 8192~8257 66 N 15 ND4 8258~9598 1341 N 0 ATG TAG ND4L 9592~9888 297 N −7 ATG TAA trnT-UGU 9891~9950 60 J −8 trnP-UGG 9971~10036 66 N 20 ND6 10039~10563 525 J 2 ATT TAA CYTB 10563~11697 1135 J −1 ATG ATT trnS-UGA 11697~12725 1029 N −1 ATA TAA ND1 11704~11770 67 J −22 trnL-UAG 12736~12800 65 N 965 l-rRNA 12778~14135 1358 N −22 trnV-UAC 14133~14204 72 N −3 s-rRNA 14204~14995 791 N −1 控制区
Control region14996~15943 947 J 0 表 2 瘤胫果实蝇线粒体全基因组碱基组成
Table 2. Bases in mitochondrial genome of B. (B.) tuberculata
区域
RegionA/% C/% G/% T/% A+T/% AT偏移
AT SkewGC偏移
GC Skew基因长度
Gene length/bp全基因组
Whole genome39.1 16.4 10.4 34.1 73.2 0.068 −0.224 15943 PCGs 29.9 14.9 14.4 40.8 70.7 −0.154 −0.017 11302 PCGs J 32.0 18.7 12.7 36.6 68.6 −0.067 −0.191 6895 PCGs N 26.7 9.0 17.0 47.2 73.9 −0.277 0.308 4407 ND2 34.1 16.8 9.1 40.0 74.1 −0.080 −0.297 1023 COXI 30.1 18.9 16.2 34.8 64.9 −0.072 −0.077 1539 COX2 33.5 18.4 14.1 34.1 67.6 −0.009 −0.132 690 ATP8 37.7 17.9 8.6 35.8 73.5 0.026 −0.351 162 ATP6 30.4 19.9 11.8 37.9 68.3 −0.110 −0.256 678 COX3 29.7 19.4 15.3 35.6 65.3 −0.090 −0.118 789 ND3 31.9 16.7 9.9 41.5 73.4 −0.131 −0.256 354 ND5 27.8 9.0 17.1 46.0 73.8 −0.247 0.310 1740 ND4 26.3 8.9 16.9 47.8 74.1 −0.290 0.310 1341 ND4L 26.6 7.1 14.5 51.9 78.5 −0.322 0.343 297 ND6 37.0 16.6 6.9 39.6 76.6 −0.034 −0.413 525 CYTB 30.9 20.7 13.5 34.9 65.8 −0.061 −0.211 1135 ND1 25.5 9.7 17.6 47.2 72.7 −0.298 0.289 1029 tRNA 36.9 11.1 14.1 37.8 74.7 −0.012 0.119 1462 tRNA J 37.2 12.7 13.2 36.8 74.0 0.005 0.019 929 tRNA N 36.4 8.4 15.6 39.6 76.0 −0.042 0.300 533 rRNA 35.7 8.0 14.6 41.7 77.4 −0.078 0.292 2149 1-rRNA 36.7 7.1 13.8 42.5 79.2 −0.073 0.321 1358 s-rRNA 34.1 9.5 16.1 40.3 74.4 −0.083 0.258 791 控制区
Control region46.9 6.6 5.0 41.5 88.4 0.061 0.138 947 表 3 瘤胫果实蝇线粒体基因组蛋白质编码基因密码子使用统计
Table 3. Statistics of codon usage in mitochondria of B. (B.) tuberculata
密码子 Codon N R 密码子 Codon N R 密码子 Codon N R 密码子 Codon N R UUU(F) 235 1.42 UCU (S) 114 2.68 UAU(Y) 144 1.73 UGU(C) 41 1.91 UUC(F) 96 0.58 UCC (S) 10 0.24 UAC(Y) 22 0.27 UGC(C) 2 0.9 UUA(L) 387 3.79 UCA (S) 95 2.24 UAA(*) 0 0.00 UGA(W) 95 1.88 UUG(L) 68 0.67 UCG (S) 2 0.05 UAG(*) 0 0.00 UGG(W) 6 0.12 CUU(L) 66 0.65 CCU(P) 75 2.17 CAU(H) 55 1.39 CGU(R) 15 1.02 CUC(L) 5 0.05 CCC(P) 13 0.38 CAC(H) 24 0.61 CGC(R) 3 0.20 CUA(L) 81 0.79 CCA(P) 48 1.39 CAA(Q) 74 1.87 CGA(R) 37 2.51 CUG(L) 5 0.05 CCG(P) 2 0.06 CAG(Q) 5 0.13 CGG(R) 4 0.27 AUU(I) 298 1.76 ACU (T) 79 1.57 AAU(N) 163 1.72 AGU(S) 47 1.11 AUC(I) 40 0.24 ACC (T) 19 0.38 AAC(N) 26 0.28 AGC(S) 9 0.21 AUA(M) 174 1.73 ACA (T) 101 2.01 AAA(K) 63 1.42 AGA(S) 63 1.48 AUG(M) 27 0.27 ACG (T) 2 0.04 AAG(K) 26 0.58 AGG(S) 0 0.00 GUU(V) 84 1.53 GCU(A) 116 2.43 GAU(D) 58 1.63 GGU(G) 71 1.23 GUC(V) 8 0.15 GCC(A) 22 0.46 GAC(D) 13 0.37 GGC(G) 3 0.05 GUA(V) 112 2.02 GCA(A) 50 1.05 GAA(E) 73 1.95 GGA(G) 126 2.18 GUG(V) 16 0.29 GCG(A) 3 0.06 GAG(E) 2 0.05 GGG(G) 31 0.54 N为线粒体全基因组蛋白质编码基因的密码子使用个数;R:RSCU为相对同义密码子的使用频率。*:终止密码子。
N: number of codons used for protein-coding genes of whole mitochondrial genome; R: frequency of use of relative synonymous codon (RSCU). *: stop codon. -
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