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Origin of the foraminifera.

机译:有孔虫的起源。

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摘要

We report nuclear small-subunit rDNA sequences for two species of the benthic foraminifer Ammonia. Because of their abundance in present and past seas, the foraminifera are a very important group of organisms used in a wide range of geologic studies; however, the ancestry of this group was, until now, unknown. Difficulties in purifying foraminiferal DNA and avoiding PCR contamination led us to develop DNA.DNA in situ hybridization techniques to verify our sequence data. Phylogenetic analysis of verified foraminiferal DNA sequence indicates these taxa are a divergent, "alveolate" lineage, within the major eukaryotic radiation. Our findings cast doubt upon the assumption that all foraminifera are derived from an amoebalike ancestor. Cytological features and the DNA sequences presented herein suggest that the foraminifera were derived from a heterokaryotic flagellated marine protist, probably sometime in the later Proterozoic.
机译:我们报告了两个底栖有孔虫氨的核小亚基rDNA序列。由于有孔虫在当前和过去的海洋中数量众多,因此它们是在广泛的地质研究中使用的非常重要的一组生物。但是,直到现在,这个人的血统还是未知的。在纯化有孔虫DNA和避免PCR污染方面的困难使我们开发了DNA。DNA原位杂交技术验证了我们的序列数据。对已验证的有孔虫DNA序列进行的系统发育分析表明,这些分类群是主要真核生物辐射内的发散的“肺泡”谱系。我们的发现对所有有孔虫都起源于变形虫类祖先的假设提出了质疑。本文呈现的细胞学特征和DNA序列表明,有孔虫是来源于杂核生鞭毛的海洋生物,可能是在后来的元古代。

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