转录组的精细结构:它是否反映了基因组的反对称性?
1Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29403, USA.
Frontiers in bioscience (Landmark edition)
|December 6, 2025
概括
转录组表现出普遍的核酸"词" (k-mer) 频率分布和反对称,与基因组属性一致. 然而,在蛋白质编码序列 (CDS) 中,反对称性比非编码RNA更弱.
科学领域:
- 生物信息学是一种生物信息学.
- 计算生物学 计算生物学
- 基因组学就是基因组学.
- 文字转录学 (Transcriptomics) 是一个学科.
背景情况:
- 基因组核酸序列 (k-mers) 具有普遍性质:Zipfian频率分布和反对称,来自哈特利-香农信息保护 (CoHSI).
- 这些特性在转录组中得到研究,特别是在蛋白质编码序列 (CDS) 和非编码RNA (ncRNA) 中,因为它们具有特定的结构-功能约束.
研究的目的:
- 为了确定k-mer频率分布和反对称的通用基因组属性是否存在于转录组中.
- 在多种物种的蛋白质编码序列 (CDS) 和非编码RNA (ncRNA) 中单独分析这些特性.
主要方法:
- 从e!Ensembl访问了53种物种的CDS和ncRNA数据库.
- 应用统计测试 (线性,充分性) 来评估k-mer频率的功率定律分布.
- 通过使用线性和剩余标准误差评估了对逆对称的合规性.
主要成果:
- 在所有分析的物种中,在CDS和ncRNA中观察到k-mer频率的统计学 robust Zipfian 分布.
- 在CDS (斜率=0.91) 和ncRNAs (斜率=1.02) 两种情况下,对逆对称度的遵守是较弱的,在CDS中扰动更大.
- 在CDS中逆对称的破坏与特定的k-mer长度 (3-和6-mers) 和子频率有关,特别是停止子.
结论:
- CoHSI预测的Zipfian k-mer频率分布在编码和非编码RNA中都保持不变.
- 与基因组相比,转录组中的反对称性合规性较弱,特别是在CDS中,可能是由于读取完整性.
- 在CoHSI指导平衡中的局部扰动为生物系统调节提供了洞察力.
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