arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1004.3843q-bio.GN
收藏

基因组序列组织的信息论观点

Information-theoretic View of Sequence Organization in a Genome

Liaofu Luo, Yang Gao, Jun Lu

摘要:

序列组织可以从两个角度来理解:一是信息冗余或信息相关(IC),二是k-mer频率统计。研究了两个问题。第一个问题是当序列长度达到某个临界值时,基因组中的IC是如何超过涨落界限而从涨落中出现有序的。我们证明,从波动到有序的转变发生在人类和大肠杆菌基因组的序列长度约20 - 30万个碱基。这意味着生命是从宏观和微观之间的区域产生的。第二部分是在进化压力和功能选择作用下基因组k聚体结构的统计规律。推导了N长基因组序列中k聚体频率偏离随机性的求和规则Q(k,N),并推导了Q(k,N)与k、N的关系。我们发现,Q(k,N)的增加与长度N在一个恒定的速度为大多数基因组序列,并表明,当功能选择的k聚体积累到一些临界值的排序发生。一个重要的发现是与基因组进化复杂性相关的求和规则。

英文摘要:

Sequence organizations are viewed from two points: one is from informational redundancy or informational correlation (IC) and another is from k-mer frequency statistics. Two problems are investigated. The first is how the ICs exceed the fluctuation bound and the order emerges from fluctuation in a genome when the sequence length attains some critical value. We demonstrated that the transition from fluctuation to order takes place at about sequence length 200-300 thousands bases for human and E coli genome. It means that the life emerges from a region between macroscopic and microscopic. The second is about the statistical law of the k-mer organization in a genome under the evolutionary pressure and functional selection. We deduced a sum rule Q(k,N) on the k-mer frequency deviations from the randomness in a N-long sequence of genome and deduced the relations of Q(k,N) with k and N. We found that Q(k,N) increases with length N at a constant rate for most genome sequences and demonstrated that when the functional selection of k-mers is accumulated to some critical value the ordering takes place. An important finding is the sum rule correlated with the evolutionary complexity of the genome.

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。

↑