Mitogenomic analyses of eutherian relationships
Mitogenomic analyses of eutherian relationships
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DOI：
10.1159/000063023
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发表时间：
2002-01-01
影响因子：
1.7
通讯作者：
Janke, A
中科院分区：
文献类型：
--
作者：
Arnason, U;Janke, A
合理正确的系统发育是检验进化假设的基础。在这里，我们基于对 67 个完整哺乳动物线粒体 (mt) 基因组的分析提出了系统发育发现。无论是在氨基酸 (aa) 水平还是在第一个和第二个密码子位置的核苷酸 (nt) 水平上进行分析，这些分析都将刺猬属（刺猬及其亲属）视为剩余真兽类的姐妹类群。因此，分析将刺猬与其他传统的脂斑动物（例如马岛环礁、鼹鼠和鼩鼱）分开，使传统的脂斑动物成为多系。 aa 和 nt 数据集都鉴定了两个丰富的真兽类进化枝，Cetferungulata（包括伞形目、食肉目、奇蹄目、偶蹄目和鲸目）和非洲进化枝（Tenrecomorpha、Macroscelidea、Tubulidentata、Hyracoidea、Proboscidea 和 Sirenia）。这项研究证实了最近的发现，即确定了类人目和皮翅目（飞狐猴）之间的姐妹群关系，从而使我们自己的灵长目成为并系群。使用古生物学上已确定的校准点进行分子估计，将大多数真兽目的起源置于距今 70-1 亿年前的白垩纪 (MYBP)。同样的估计认为所有灵长类动物的分化都比传统认为的要早得多。例如，据估计，人属和潘族之间的分歧大约发生在 10 MYBP 左右，这一年代测定与灵长类古生物学的最新发现一致。版权所有 (C) 2002 S. Karger AG，巴塞尔。
Reasonably correct phylogenies are fundamental to the testing of evolutionary hypotheses. Here, we present phylogenetic findings based on analyses of 67 complete mammalian mitochondrial (mt) genomes. The analyses, irrespective of whether they were performed at the amino acid (aa) level or on nucleotides (nt) of first and second codon positions, placed Erinaceomorpha (hedgehogs and their kin) as the sister group of remaining eutherians. Thus, the analyses separated Erinaceomorpha from other traditional lipotyphlans (e.g., tenrecs, moles, and shrews), making traditional Lipotyphla polyphyletic. Both the aa and nt data sets identified the two order-rich eutherian clades, the Cetferungulata (comprising Pholidota, Carnivora, Perissodactyla, Artiodactyla, and Cetacea) and the African clade (Tenrecomorpha, Macroscelidea, Tubulidentata, Hyracoidea, Proboscidea, and Sirenia). The study corroborated recent findings that have identified a sister-group relationship between Anthropoidea and Dermoptera (flying lemurs), thereby making our own order, Primates, a paraphyletic assembly. Molecular estimates using paleontologically well-established calibration points, placed the origin of most eutherian orders in Cretaceous times, 70-100 million years before present (MYBP). The same estimates place all primate divergences much earlier than traditionally believed. For example, the divergence between Homo and Pan is estimated to have taken place approximate to 10 MYBP, a dating consistent with recent findings in primate paleontology. Copyright (C) 2002 S. Karger AG, Basel.