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每日翻译20190517

已有 268 次阅读 2019-5-17 07:08 |个人分类:翻译作品|系统分类:科研笔记| DNA条形码, 分子标记, 阀值, 种间距离

#编者信息

熊荣川

明湖实验室

xiongrongchuan@126.com

http://blog.sciencenet.cn/u/Bearjazz


The concept of DNA barcoding, which   applies the mitochondrial cytochrome c oxidase subunit 1 (COI) marker in   animals, is based on the premise that there is low variation within species   and large divergence gaps between sister species (Hebert et al. 2003, 2004b).   Accordingly, provisional species are often suggested when sequence divergence   exceeds a certain threshold (e.g., 10 times average intraspecific variation;   Carr et al. 2011; Kerr et al. 2007). However, there are examples of sympatric   intraspecific divergences of a magnitude that exceeds normal sister specieslevel divergence (Wayne et al. 1990; Tominaga et al. 2009; Xiao et   al. 2012), making species discrimination based on a strict divergence   threshold in mtDNA too simplistic (Moritz and Cicero 2004).

将线粒体细胞色素c氧化酶亚基1COI)标记应用于动物的DNA条形码的概念是基于物种种内变异小、姊妹物种间差异大的前提(Hebert et al. 2003, 2004b)。因此,当序列差异超过某一阈值(例如,10倍的平均种内差异;Carr et al. 2011; Kerr et al. 2007)时,通常建议使用临时物种。然而,也有一些同一地区种内差异差异超过姊妹种种间差异的例子,(Wayne et al. 1990; Tominaga et al. 2009; Xiao et al. 2012),这样,基于严格的线粒体DNA分歧阈值进行物种界定的方法就显得过于简单化(Moritz and Cicero 2004)。

Hogner S , Laskemoen T , Lifjeld J T , et   al. Deep sympatric mitochondrial divergence without reproductive isolation in   the common redstart, Phoenicurus phoenicurus[J]. Ecology and Evolution, 2012,   2(12):2974-2988.




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