arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.11599q-bio.PEmath.CO
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系统对称代数:遗传学中新工具的数学性质

Phylosymmetric algebras: mathematical properties of a new tool in phylogenetics

Michael Hendriksen, Julia A. Shore

摘要:

在遗传学中,速率矩阵集满足矩阵乘法下的闭包是令人感兴趣的,因为这使得找到相应的转移矩阵集而不必计算矩阵指数成为可能。具有少量的自由参数也是有利的,因为这在应用中将导致计算时间的减少。我们探索了一种方法,建立一个率矩阵集从一个有根树结构的内部树节点和状态分配率的叶子,然后定义两个状态之间的变化率分配给这两个国家的最近的共同祖先的速率。我们从线性代数和图论的角度研究了这些矩阵集的性质,并证明了这种方法生成的任何速率矩阵集在矩阵乘法下都是封闭的。然后考虑将分配给内部树节点的两个速率设置为相等的后果。该方法可用于开发具有少量参数但传达生物学意义的氨基酸取代的参数化模型。

英文摘要:

In phylogenetics it is of interest for rate matrix sets to satisfy closure under matrix multiplication as this makes finding the set of corresponding transition matrices possible without having to compute matrix exponentials. It is also advantageous to have a small number of free parameters as this, in applications, will result in a reduction of computation time. We explore a method of building a rate matrix set from a rooted tree structure by assigning rates to internal tree nodes and states to the leaves, then defining the rate of change between two states as the rate assigned to the most recent common ancestor of those two states. We investigate the properties of these matrix sets from both a linear algebra and a graph theory perspective and show that any rate matrix set generated this way is closed under matrix multiplication. The consequences of setting two rates assigned to internal tree nodes to be equal are then considered. This methodology could be used to develop parameterised models of amino acid substitution which have a small number of parameters but convey biological meaning.

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