Mitochondrial genome of the homoscleromorph Oscarella carmela (Porifera, Demospongiae) reveals unexpected complexity in the common ancestor of sponges and other animals.
Mitochondrial genome of the homoscleromorph Oscarella carmela (Porifera, Demospongiae) reveals unexpected complexity in the common ancestor of sponges and other animals.
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同硬形Oscarella carmela（Porifera、Demospongiae）的线粒体基因组揭示了海绵和其他动物的共同祖先中意想不到的复杂性。
DOI：
10.1093/molbev/msl167
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发表时间：
2006
影响因子：
10.7
通讯作者：
D. Lavrov
中科院分区：
文献类型：
--
作者：
Xiujuan Wang;D. Lavrov
同形目（Homoscleromorpha）是多孔动物门（海绵）中的一个小类群，其特征是具有几个与真后生动物共有的形态特征（基膜、精子中的顶体和鞭毛基底器的横纹根），但在大多数其他海绵中没有发现。为了阐明这一群体的系统发育位置，我们测定和分析了同源异形海绵Oscarella carmela（Porifera，Demospongiae）的线粒体DNA（mtDNA）全序列。O. carmela mtDNA为20，327 bp，包含动物mtDNA中报道的最大互补基因，包括从未在动物mtDNA中发现的双精氨酸移位酶（tatC）的C亚基的推定基因。O. carmela mtDNA排列成两个转录方向相反的簇，这种基因排列让人想起几种刺胞动物mtDNA中的基因排列，但与海绵中报道的不同。与此同时，系统发育分析的基础上连接的氨基酸序列从12个线粒体（mt）蛋白基因的强烈支持同源和其他demosponges之间的系统发育亲和力。总而言之，我们的数据表明，同形海绵是在mt基因组和形态组织中保留了其他分类群中丢失的祖先特征的海绵动物，海绵和其他动物最近的共同祖先在形态和遗传上比以前认为的更复杂。
Homoscleromorpha is a small group in the phylum Porifera (Sponges) characterized by several morphological features (basement membrane, acrosomes in spermatozoa, and cross-striated rootlets of the flagellar basal apparatus) shared with eumetazoan animals but not found in most other sponges. To clarify the phylogenetic position of this group, we determined and analyzed the complete mitochondrial DNA (mtDNA) sequence of the homoscleromorph sponge Oscarella carmela (Porifera, Demospongiae). O. carmela mtDNA is 20,327 bp and contains the largest complement of genes reported for animal mtDNA, including a putative gene for the C subunit of the twin-arginine translocase (tatC) that has never been found in animal mtDNA. The genes in O. carmela mtDNA are arranged in 2 clusters with opposite transcriptional orientations, a gene arrangement reminiscent of those in several cnidarian mtDNAs but unlike those reported in sponges. At the same time, phylogenetic analyses based on concatenated amino acid sequences from 12 mitochondrial (mt) protein genes strongly support the phylogenetic affinity between the Homoscleromorpha and other demosponges. Altogether, our data suggest that homoscleromorphs are demosponges that have retained ancestral features in both mt genome and morphological organization lost in other taxa and that the most recent common ancestor of sponges and other animals was morphologically and genetically more complex than previously thought.
影响因子：
10.7
作者：
Bruno, WJ;Socci, ND;Halpern, AL
通讯作者：
Halpern, AL
影响因子：
3.5
作者：
MEDLIN, L;ELWOOD, HJ;SOGIN, ML
通讯作者：
SOGIN, ML