Unexpected repertoire of metazoan transcription factors in the unicellular holozoan Capsaspora owczarzaki.

Unexpected repertoire of metazoan transcription factors in the unicellular holozoan Capsaspora owczarzaki.
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DOI:
10.1093/molbev/msq309
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发表时间:
2011-03
影响因子:
10.7
通讯作者:
Ruiz-Trillo I
Ruiz-Trillo I
中科院分区:
生物学1区
文献类型:
--
作者:
Sebé-Pedrós A;de Mendoza A;Lang BF;Degnan BM;Ruiz-Trillo I

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动物(后生动物)如何从单细胞祖先进化而来仍然是生物学中的一个主要问题。由于转录调控对动物发育至关重要,破译相关转录因子(tf)的早期进化对于理解后生动物的起源至关重要。在这项研究中,我们发现了17个后生动物TFs在变形虫全虫Capsaspora owczarzaki中,这是一个单细胞谱系的代表,与鞭虫和后生动物密切相关。系统发育和比较基因组分析与尽可能广泛的分类抽样使我们能够制定关于发育后生动物tf的起源和进化的新假设。我们发现,Capsaspora owczarzaki中TF序列的复杂性非常高,进一步推迟了一些以前被认为是后生动物特异性的TF的起源,如T-box或Runx。尽管如此,TF家族的起源早于动物王国的起源,如homeddomain或bHLH,沿着后生动物和真生动物的茎经历了显著的扩张和多样化。
How animals (metazoans) originated from their single-celled ancestors remains a major question in biology. As transcriptional regulation is crucial to animal development, deciphering the early evolution of associated transcription factors (TFs) is critical to understanding metazoan origins. In this study we uncovered the repertoire of seventeen metazoan TFs in the amoeboid holozoan Capsaspora owczarzaki, a representative of a unicellular lineage that is closely related to choanoflagellates and metazoans. Phylogenetic and comparative genomic analyses with the broadest possible taxonomic sampling allowed us to formulate new hypotheses regarding the origin and evolution of developmental metazoan TFs. We show that the complexity of the TF repertoire in Capsaspora owczarzaki is strikingly high, pushing back further the origin of some TFs formerly thought to be metazoan-specific, such as T-box or Runx. Nonetheless, TF families whose beginnings antedate the origin of the animal kingdom, such as homedomain or bHLH, underwent significant expansion and diversification along metazoan and eumetazoan stems.
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