Analysis of phenotypic evolution in Dictyostelia highlights developmental plasticity as a likely consequence of colonial multicellularity.
Analysis of phenotypic evolution in Dictyostelia highlights developmental plasticity as a likely consequence of colonial multicellularity.
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DOI：
10.1098/rspb.2013.0976
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发表时间：
2013-08-07
期刊：
影响因子：
--
通讯作者：
Schaap P
中科院分区：
文献类型：
--
作者：
Romeralo M;Skiba A;Gonzalez-Voyer A;Schilde C;Lawal H;Kedziora S;Cavender JC;Glöckner G;Urushihara H;Schaap P
在许多宏观生物中，菌落的形成是多细胞进化的第一步。网柱虫类社会性变形虫使用这种策略已经超过6亿年，以形成越来越复杂的结果实结构。为了了解多细胞复杂性进化的顺序，我们测量了99个网柱藻物种的24个表型特征。利用系统发育比较的方法，我们表明，最后共同祖先（LCA）的Dictyostelia可能竖立小果结构直接从聚集体。它分泌cAMP来协调子实体形态发生，并分泌另一种化合物来介导聚集。这种表型持续到网柱纲四个主要类群中的三个的LCA。组4 LCA增选cAMP聚集和进化更大的子实体结构。然而，它失去了包囊，孤独的阿米巴原虫的生存策略，是保留了许多物种在第1-3组。大结构，向光性和迁移中间的“蛞蝓”阶段共同进化的进化新奇的大多数群体。总的来说，无论是在物种内部还是物种之间，网柄类在多细胞结构的大小和形状上都表现出相当大的可塑性。这可能反映了殖民生活对发育控制机制的限制，根据局部细胞密度，需要指导10到100万个细胞形成功能性果实。
Colony formation was the first step towards evolution of multicellularity in many macroscopic organisms. Dictyostelid social amoebas have used this strategy for over 600 Myr to form fruiting structures of increasing complexity. To understand in which order multicellular complexity evolved, we measured 24 phenotypic characters over 99 dictyostelid species. Using phylogenetic comparative methods, we show that the last common ancestor (LCA) of Dictyostelia probably erected small fruiting structures directly from aggregates. It secreted cAMP to coordinate fruiting body morphogenesis, and another compound to mediate aggregation. This phenotype persisted up to the LCAs of three of the four major groups of Dictyostelia. The group 4 LCA co-opted cAMP for aggregation and evolved much larger fruiting structures. However, it lost encystation, the survival strategy of solitary amoebas that is retained by many species in groups 1–3. Large structures, phototropism and a migrating intermediate ‘slug’ stage coevolved as evolutionary novelties within most groups. Overall, dictyostelids show considerable plasticity in the size and shape of multicellular structures, both within and between species. This probably reflects constraints placed by colonial life on developmental control mechanisms, which, depending on local cell density, need to direct from 10 to a million cells into forming a functional fructification.
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影响因子：
64.8
作者：
Loftus, B;Anderson, I;Hall, N
通讯作者：
Hall, N
DOI：
10.1073/pnas.85.11.3885
发表时间：
1988-06-01
影响因子：
11.1
作者：
BONNER, JT;CHIANG, A;SUTHERS, HB
通讯作者：
SUTHERS, HB
DOI：
10.1073/pnas.0502238102
发表时间：
2005-05-03
影响因子：
11.1
作者：
Alvarez-Curto, E;Rozen, DE;Schaap, P
通讯作者：
Schaap, P
影响因子：
2.5
作者：
Asghar, Asma;Groth, Marco;Winckler, Thomas
通讯作者：
Winckler, Thomas
影响因子：
2.5
作者：
Brown, Matthew W.;Silberman, Jeffrey D.;Spiegel, Frederick W.
通讯作者：
Spiegel, Frederick W.