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首页> 外文期刊>Molecular phylogenetics and evolution >Molecular Phylogenetic Examination of the Delphinoidea Trichotomy: Congruent Evidence from Three Nuclear Loci Indicates That Porpoises (Phocoenidae) Share a More Recent Common Ancestry with White Whales (Monodontidae) Than They Do with True Dolphins
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Molecular Phylogenetic Examination of the Delphinoidea Trichotomy: Congruent Evidence from Three Nuclear Loci Indicates That Porpoises (Phocoenidae) Share a More Recent Common Ancestry with White Whales (Monodontidae) Than They Do with True Dolphins

机译：Delphinoidea三分法的分子系统发育检查：来自三个核基因座的一致证据表明，海豚（Phocoenidae）与白鲸（Monodontidae）比真正的海豚拥有更近的共同祖先

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摘要

Porpoises (Phocoenidae), dolphins (Delphinidae), and the two species of Monodontidae (beluga and narwhal) together constitute the superfamily Delphinoidea. Although there is extensive evidence supporting the monophyly of this superfamily, previous studies involving morphology, as well as sequence analysis of mitochondrial genes, have failed to yield a clear picture of the relative relationships within the group. Here we present the first examination of this issue from the perspective of single-copy nuclear genes at the DNA sequence level. The data involve three such loci: von Willebrand factor (vWF), interphotoreceptor retinoid binding protein (IRBP), and lactalbumin. The vWF and IRBP data sets consist of protein-coding fragments, whereas the sequenced lactalbumin fragment is predominately intronic. All phylogenetic analyses involving at least one representative from each of the three Delphinoidea families congruently support a beluga/porpoise clade. The levels of sequence divergence for most of these data appear to roughly concur with a paleontological date for the radiation of the Delphinoidea at 11-15 MYA but, in agreement with mitochondrial DNA sequence analyses, suggest that the extant major groups of cetaceans radiated approximately 25 MYA, 10 million years later than inferred from paleontological data.
机译：海豚（Phocoenidae），海豚（Delphinidae）和Monondontidae的两个物种（beluga和narwhal）共同构成了超纲Delphinoidea。尽管有大量证据支持该超家族的单亲性，但以前涉及形态学的研究以及线粒体基因的序列分析未能清晰地反映出该家族中的相对关系。在这里，我们从DNA序列水平的单拷贝核基因的角度提出了对该问题的首次检查。数据涉及三个这样的基因座：von Willebrand因子（vWF），感光体间类视黄醇结合蛋白（IRBP）和乳白蛋白。 vWF和IRBP数据集由蛋白质编码片段组成，而测序的乳清蛋白片段主要是内含子。所有涉及三个Delphinoidea家族中至少一个的代表的系统发育分析都一致地支持白鲸/海豚进化枝。大多数这些数据的序列差异水平似乎与古生物日期为11-15 MYA的Delphinoidea辐射大致相符，但与线粒体DNA序列分析一致，表明现存的主要鲸类主要群体辐射了约25比古生物学数据推断的晚了1000万年。

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