Polymer physics of structural evolution in synthetic yeast chromosomes
Polymer physics of structural evolution in synthetic yeast chromosomes
复制标题
合成酵母染色体结构进化的高分子物理学
DOI:
10.1101/2022.09.14.507906
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Stracquadanio G
中科院分区:
文献类型:
--
作者:
Stracquadanio G
Yeast SCRaMbLE is an experimental method using designed synthetic yeast chromosomes to generate combinatorial diversity through genome rearrangements. These events occur at designed loxPsym recombination sites through the activity of Cre recombinase. While the synthetic SCRaMbLE system was designed to explore minimal genomes and permit rapid genome evolution, the pattern of recombinations also reflects inherent properties of DNA looping required to coalesce pairs of loxPsym sites.Genomes of yeast strains generated by SCRaMbLE are analyzed here using a new statistical mechanics model, called the SCRaMbLE Polymer Interaction (SPI) model. SPI uses polymer physics to model recombinations, and implements efficient rejection sampling and histogram reweighting algorithms to conduct SCRaMbLE experimentsin silico.Using SPI, we found that recombination events observed experimentally are consistent with a random walk scaling exponent ranging between 0.45 and 0.6, which spans values of 0.55 for a Gaussian polymer and 0.588 for a self-avoiding walk. SPI provides a highly accurate tool to study SCRaMbLE recombinations and massively parallel genome recombination experiments.
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