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arXiv 1506.01985q-bio.PE
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生活史〈动〉<动>和多细胞起源:不同类型细胞的情况

Life history evolution and the origin of multicellularity: the case of different types of cells

Fuad Aleskerov, Denis Tverskoy

摘要:

单细胞到多细胞的转化问题是进化生物学中讨论的主要问题之一。在[1]中,细胞集落的适应性是根据其两个基本组成部分,生存力和繁殖力来考虑的。每个单元的内在权衡函数定义了单元的类型。我们详细阐述了[1]中提供的模型。假设所有内在的权衡函数是线性的,我们构建了一个模型,不同的细胞类型,并表明这些类型的分化往往完全专业化。此外,我们试图考虑的事实,环境因素对适应性的群体。因此,我们引入了一个能量限制的模型,并表明,在最佳的情况下,我们得到的情况下,存在一组状态,他们每个人都允许殖民地达到相同的最大水平的健身。在某些状态下,任意选择的细胞可能是特化的,在某些状态下可能是非特化的,但是每个细胞的繁殖力和生存力属于有限的范围(对于每个细胞来说是唯一的)。值得指出的是,[1]中的模型并不稳健。我们正在努力克服这一劣势。

英文摘要:

The problem of unicellular-multicellular transition is one of the main issues that is discussing in evolutionary biology. In [1] the fitness of a colony of cells is considered in terms of its two basic components, viability and fecundity. Intrinsic trade-off function of each cell defines a type of cell. We elaborate models providing in [1]. Assuming that all intrinsic trade-off functions are linear, we construct a model with different cell types and show that the differentiation of these types tends to full specialization. In addition, we attempt to consider the fact that environmental factors influence on the fitness of the colony. Thus, we introduce an energy restriction to the model and show that in optimum we get situations in which there exists a set of states, each of them allowing colony to achieve the same maximum level of fitness. In some states arbitrary chosen cell may be specialized, in some - unspecialized, but fecundity and viability of each cell belong to limited ranges (which are unique for each cell). It is worth pointing out that the models from [1] are not robust. We try to overcome this disadvantage.

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