Selaginella Genome Analysis - Entering the "Homoplasy Heaven" of the MADS World.
Selaginella Genome Analysis - Entering the "Homoplasy Heaven" of the MADS World.
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DOI：
10.3389/fpls.2012.00214
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发表时间：
2012
影响因子：
5.6
通讯作者：
Litt A
中科院分区：
文献类型：
--
作者：
Gramzow L;Barker E;Schulz C;Ambrose B;Ashton N;Theißen G;Litt A
在开花植物中，可以说最重要的调控发育的转录因子是MADS结构域蛋白，由I型和II型MADS-box基因编码。类型II基因分为MIKCC和MIKC*两组。在被子植物中，这些类型和群在雌配子体、胚胎和种子(类型I)、孢子体营养组织和花组织(MIKCC)以及雄配子体(MIKC*)的发育中发挥着不同的作用，但它们在其他植物中的功能很大程度上是未知的。MADS-box基因的全套已经在几种被子植物和一种苔藓植物中得到了描述。我们对卷柏的全基因组序列进行了研究，发现了19个可能的MADS-box基因(13个I型，3个MIKCC和3个MIKC*)。我们的结果表明，维管束植物的最新共同祖先至少拥有两个类型I和两个类型II基因。莫伦多夫链霉菌的MIKCC基因没有被鉴定为任何花器官识别基因的同源基因。这有力地证实了这样的观点，即花器官特征基因的分支起源于种子植物的共同祖先，在导致番茄芽的谱系分支之后，MIKCC基因在导致种子植物的谱系中的扩展促进了它们独特的生殖器官的进化。墨尔内多夫链霉菌和被子植物的MIKC*基因数目和MIKC*/MIKCC基因的比值均低于青海棠，这与维管束植物配子体的减少有关。我们的数据表明，I型基因在番茄和种子植物中独立复制和多样化。我们对MADS-box基因进化的观察与形态进化相呼应，因为维管植物的两个谱系似乎独立地出现在相似的身体平面上。我们对MADS-box基因在莫伦多夫链霉菌中的注释为功能研究提供了基础，以揭示这个关键基因家族在基生维管植物中的作用。
In flowering plants, arguably the most significant transcription factors regulating development are MADS-domain proteins, encoded by Type I and Type II MADS-box genes. Type II genes are divided into the MIKCC and MIKC* groups. In angiosperms, these types and groups play distinct roles in the development of female gametophytes, embryos, and seeds (Type I); vegetative and floral tissues in sporophytes (MIKCC); and male gametophytes (MIKC*), but their functions in other plants are largely unknown. The complete set of MADS-box genes has been described for several angiosperms and a moss, Physcomitrella patens. Our examination of the complete genome sequence of a lycophyte, Selaginella moellendorffii, revealed 19 putative MADS-box genes (13 Type I, 3 MIKCC, and 3 MIKC*). Our results suggest that the most recent common ancestor of vascular plants possessed at least two Type I and two Type II genes. None of the S. moellendorffii MIKCC genes were identified as orthologs of any floral organ identity genes. This strongly corroborates the view that the clades of floral organ identity genes originated in a common ancestor of seed plants after the lineage that led to lycophytes had branched off, and that expansion of MIKCC genes in the lineage leading to seed plants facilitated the evolution of their unique reproductive organs. The number of MIKC* genes and the ratio of MIKC* to MIKCC genes is lower in S. moellendorffii and angiosperms than in P. patens, correlated with reduction of the gametophyte in vascular plants. Our data indicate that Type I genes duplicated and diversified independently within lycophytes and seed plants. Our observations on MADS-box gene evolution echo morphological evolution since the two lineages of vascular plants appear to have arrived independently at similar body plans. Our annotation of MADS-box genes in S. moellendorffii provides the basis for functional studies to reveal the roles of this crucial gene family in basal vascular plants.
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影响因子：
4.4
作者：
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通讯作者：
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