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arXiv 2104.04161q-bio.PEcond-mat.soft
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微通道中的群体遗传学

Population genetics in microchannels

Anzhelika Koldaeva, Hsieh-Fu Tsai, Amy Q. Shen, Simone Pigolotti

摘要:

空间限制,如刚性障碍,影响细胞群体的动态,可能改变自然进化的过程。本文研究了大肠杆菌在开口微通道中增殖的群体遗传学。我们的分析基于种群模型,其中繁殖细胞将整个细胞道移向通道的开放端。该模型预测,车道内的多样性损失非常迅速,但车道之间的速度要慢得多。因此,两个混合的,中性的E。在微通道中竞争的大肠杆菌菌株必须在几代的过程中组织成有序的规则条纹模式。这些预测与我们的实验在数量上是一致的。我们还表明,随机突变出现在通道的中间更有可能达到固定比发生在其他地方。我们的研究结果说明了空间受限空间中微生物进化的基本机制。

英文摘要:

Spatial constraints such as rigid barriers affect the dynamics of cell populations, potentially altering the course of natural evolution. In this paper, we investigate the population genetics of Escherichia coli proliferating in microchannels with open ends. Our analysis is based on a population model in which reproducing cells shift entire lanes of cells towards the open ends of the channel. The model predicts that diversity is lost very rapidly within lanes, but at a much slower pace among lanes. As a consequence, two mixed, neutral E. coli strains competing in a microchannel must organize into an ordered regular stripe pattern in the course of a few generations. These predictions are in quantitative agreement with our experiments. We also demonstrate that random mutations appearing in the middle of the channel are much more likely to reach fixation than those occurring elsewhere. Our results illustrate fundamental mechanisms of microbial evolution in spatially confined space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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