Cytoplasmic inheritance of parent-offspring cell structure in the clonal diatom Cyclotella meneghiniana
Cytoplasmic inheritance of parent-offspring cell structure in the clonal diatom Cyclotella meneghiniana
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克隆硅藻Cyclotella meneghiniana亲代细胞结构的细胞质遗传
DOI：
10.1098/rspb.2016.1632
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Shimada M.
中科院分区：
文献类型：
--
作者：
Shirokawa Y.;Shimada M.
在细胞质遗传中，亲本细胞的结构状态可以通过两种机制传递给子代细胞。第一种被称为亲本结构的残留，其中结构本身保留并忠实地在后代细胞中传递；第二种是结构遗传，父结构作为新的子代结构发展的模板。我们利用一株meneghiniana硅藻cyclotella克隆，通过结构遗传来估计亲本结构对子代结构发育的影响程度。细胞有两个硅质瓣（细胞两极的细胞壁部分）：一个是从亲本遗传的，另一个是新形成的。我们利用单细胞分离和瓣膜标记，通过比较亲本和新子代瓣膜的瓣膜性状（中央fultoportulae （CTFP）、条纹、中心面积和细胞直径）来估计细胞质遗传力。亲代阀性状回归分析表明，除CTFP外，其余性状均呈显著相关。我们建立了一个考虑硅藻遗传系统的定量遗传模型，揭示了与其他遗传系统相比硅藻的短期快速进化。硅藻结构遗传的进化将使无性系种群能够迅速获得并维持适合环境和生命周期阶段变化的结构。
In cytoplasmic inheritance, structural states of a parent cell could be transmitted to offspring cells via two mechanisms. The first is referred to as the hangover of parent structure, where the structure itself remains and faithfully transmits within offspring cells; the second is structural inheritance, wherein the parent structure functions as a template for development of new offspring structure. We estimated to what extent the parent structure affects the development of offspring structure by structural inheritance, using a clone of the diatomCyclotella meneghiniana. The cell has two siliceous valves (a cell wall part at both cell poles): one is inherited from the parent and the other is newly formed. We estimated cytoplasmic heritability by comparing valve traits (central fultoportulae (CTFP), striae, central area, and cell diameter) of parent and new offspring valves, using single-cell isolation and valve labelling. Parent–offspring valve trait regressions showed that all traits, except CTFP, were significantly correlated. We formulated a quantitative genetic model considering the diatom inheritance system and revealed short-term rapid evolution compared with other inheritance systems. Diatom structural inheritance will have evolved to enable clonal populations to rapidly acquire and maintain suitable structures for temporal changes in environments and life-cycle stages.