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The Novel Gene Rearrangement of the Mitochondrial Genome of the Occidozyga martensii and the Phylogenetic Relationships within Neobatrachia

Author: LiXiaoQiang
Tutor: WuXiaoBing
School: Anhui Normal University
Course: Zoology
Keywords: Yuanshefuwa Mitochondrial genome Gene rearrangement Phylogeny
CLC: Q78
Type: Master's thesis
Year: 2010
Downloads: 39
Quote: 0
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Abstract


The article refers to the closely related species mitochondrial genome sequences , specific primers were designed , round tongue floating frog (Occidozyga martensii) mitochondrial genome sequences using PCR and Long-PCR method sequencing , sequence length of 18 , 321 bp . Round tongue floating frogs mtDNA base composition and codon usage of protein-coding genes are similar to other vertebrates , but the structure of the genome rearrangement , round tongue floating frog mtDNA genome contains 23 a tRNA group gene ( more than one in series repeated tRNA of M et ) ; D - loop near several the tRNA based rearrangement to form \gene cluster ( tRNA the Leu (CUN ) < / sup> - tRNA Thr < / sup> the - tRNA is Pro < / sup > - tRNA is Phe < / sup >) , while the protein-coding The genetic the ND5 shift to the downstream of the control area . In addition, in the round tongue floating frog mtDNA tRNA Asn < / sup > in the tRNA Tyr and CO I gene between other amphibians mtDNA , the gene is located in tRNA < sup > Ala and tRNA Cys < / sup> gene . the tRNA A < / sup > sn gene shift is the first time in a vertebrate discovered. According to the mechanisms of gene rearrangement doubled - random deletion model , the the round tongue floating frog the mtDNA \-tRNA Cys -tRNA Tyr ) gene order after at least one copy - delete process . MP, ML, BI three phylogenetic tree based on the 21 kinds Anura animals 13 protein-coding genes and two rRNA gene combined sequence were constructed to provide more evidence in order to investigate the status of frogs classification system . The results show that in the the MP tree RANIDAE constitute a monophyletic groups , but in the ML tree and BI tree frog Division and the tree frog Division and the Cayman Ranidae formation clade , and has a high degree of confidence . Three phylogenetic tree , subfamily by Chinese frog species problem has not been a good solution , but according to the relationship of gene rearrangements occurred , the results of this study support the two sub Ranidae species Branch division of the frog subfamily and fork tongue frog subfamily . Finally, we explore the relationship Anura animal mitochondrial gene rearrangement system .

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CLC: > Biological Sciences > Molecular Biology > Genetic engineering (genetic engineering)
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