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《Frontiers of Agricultural Science and Engineering》 2017年03期
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Conserved gene arrangement in the mitochondrial genomes of barklouse families Stenopsocidae and Psocidae

Xiaochen LIU  Hu LI  Yao CAI  Fan SONG  John-James WILSON  Wanzhi CAI  
【摘要】:Substantial variation in gene organization and arrangement has been reported for sequenced mitochondrial(mt) genomes from the suborders of the insect order Psocoptera. In this study we sequenced the complete mt genome of Stenopsocus immaculatus, the first representative of the family Stenopsocidae from the suborder Psocomorpha. Relative to the ancestral pattern, rearrangements of a protein-coding gene(nad3) and five t RNA genes(trnQ, trnC, trnN, trnS1, trnE) were found. This pattern was similar to that of two barklice from the family Psocidae, with the exception of the translocation of trnS1,trnE and trnI. Based on comparisons of pairwise breakpoint distances of gene rearrangements, gene number and chromosome number, it was concluded that mt genomes of Stenopsocidae and Psocidae share a relatively conserved pattern of gene rearrangements; mt genomes within the Psocomorpha have been generally stable over long evolutionary history; and mt gene rearrangement has been substantially faster in the booklice(suborder Troctomorpha) than in the barklice(suborders Trogiomorpha and Psocomorpha). It is speculated that the change of life history and persistence of unusual reproductive systems with maternal inheritance contributed to the contrasting rates in mt genome evolution between the barklice and booklice.
【作者单位】Department
【基金】:supported by grants from the National Natural Science Foundation of China (31401991, 31420103902, 31372229) the Beijing Natural Science Foundation (6152016, 6144027) the Chinese Universities Scientific Fund (2017QC100, 2017QC066, 2017ZB002)
【分类号】:Q963
【正文快照】:
1 IntroductionThe animal mitochondrial(mt)genome is important in cellmetabolism,apoptosis,disease and aging[1].The mtgenome is the most extensively studied genomic system in insects,with sequenced representatives from all insectorders available in Gen B

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