Boore Jeffrey L, Staton Joseph L
Department of Biology, University of Michigan. DOE Joint Genome Institute and Lawrence Berkeley National Laboratory, Walnut Creek, California 94598, USA.
Mol Biol Evol. 2002 Feb;19(2):127-37. doi: 10.1093/oxfordjournals.molbev.a004065.
We determined the sequence of about half (7,470 nt) of the mitochondrial genome of the sipunculid Phascolopsis gouldii, the first representative of this phylum to be so studied. All of the 19 identified genes are transcribed from the same DNA strand. The arrangement of these genes is remarkably similar to that of the oligochaete annelid Lumbricus terrestris. Comparison of both the inferred amino acid sequences and the gene arrangements of a variety of diverse metazoan taxa reveals that the phylum Sipuncula is more closely related to Annelida than to Mollusca. This requires reinterpretation of the homology of several embryological features and of patterns of animal body plan evolution.
我们测定了星虫类古氏管体星虫（Phascolopsis gouldii）线粒体基因组约一半（7470个核苷酸）的序列，这是该门第一个进行此类研究的代表物种。已鉴定出的19个基因均从同一条DNA链转录而来。这些基因的排列与寡毛纲环节动物陆正蚓（Lumbricus terrestris）的排列极为相似。对多种不同后生动物类群的推断氨基酸序列和基因排列进行比较后发现，星虫门与环节动物门的关系比与软体动物门的关系更为密切。这需要对一些胚胎学特征的同源性以及动物体计划进化模式进行重新解释。
