Patterns of evolution of mitochondrial cytochrome c oxidase I and II DNA and implications for DNA barcoding

被引:192
作者
Roe, Amanda D. [1 ]
Sperling, Felix A. H. [1 ]
机构
[1] Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
COI; mtDNA; species delimitation; divergence; saturation; insects;
D O I
10.1016/j.ympev.2006.12.005
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
DNA barcoding has focused increasing attention on the use of specific regions of mitochondrial cytochrome c oxidase I and 11 genes (COI-COII) to diagnose and delimit species. However, our understanding of patterns of molecular evolution within these genes is limited. Here we examine patterns of nucleotide divergence in COI-COII within species and between species pairs of Lepidoptera and Diptera using a sliding window analysis. We found that: (1) locations of maximum divergence within COI-COII were highly variable among taxa surveyed in this study; (2) there was major overlap in divergence within versus between species, including within individual COI-CoII profiles; (3) graphical DNA saturation analysis showed variation in percent nucleotide transitions throughout COI-COII and only limited association with levels of DNA divergence. Ultimately, no single optimally informative 600 bp location was found within the 2.3kb of COI-COII, and the DNA barcoding region was no better than other regions downstream in Col. Consequently, we recommend that researchers should maximize sequence length to increase the probability of sampling regions of high phylogenetic informativeness, and to minimize stochastic variation in estimating total divergence. (c) 2007 Elsevier Inc. All rights reserved.
引用
收藏
页码:325 / 345
页数:21
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