Castro-Chavez Fernando
Department of Medicine, Atherosclerosis and Vascular Medicine Section, Baylor College of Medicine, Houston, TX, USA. .
Neuroquantology. 2011 Dec;9(4):728-746. doi: 10.14704/nq.2011.9.4.499.
In this article, the pattern learned from the classic or conventional rotating circular genetic code is transferred to a 64-grid model. In this non-static representation, the codons for the same amino acid within each quadrant could be exchanged, wobbling or rotating in a quantic way similar to the electrons within an atomic orbit. Represented in this 64-grid format are the three rules of variation encompassing 4, 2, or 1 quadrant, respectively: 1) same position in four quadrants for the essential hydrophobic amino acids that have U at the center, 2) same or contiguous position for the same or related amino acids in two quadrants, and 3) equivalent amino acids within one quadrant. Also represented is the mathematical balance of the odd and even codons, and the most used codons per amino acid in humans compared to one diametrically opposed organism: the plant Arabidopsis thaliana, a comparison that depicts the difference in third nucleotide preferences: a C/U exchange for 11 amino acids, a G/A exchange for 2 amino acids, and G/U or C/A exchanges for one amino acid, respectively; by studying these codon usage preferences per amino acid we present our two hypotheses: 1) A slower translation in vertebrates and 2) a faster translation in invertebrates, possibly due to the aqueous environments where they live. These codon usage preferences may also be able to determine genomic compatibility by comparing individual mRNAs and their functional third dimensional structure, transport and translation within cells and organisms. These observations are aimed to the design of bioinformatics computational tools to compare human genomes and to determine the exchange between compatible codons and amino acids, to preserve and/or to bring back extinct biodiversity, and for the early detection of incompatible changes that lead to genetic diseases.
在本文中,从经典或传统旋转圆形遗传密码中学到的模式被转移到一个64格模型中。在这种非静态表示中,每个象限内相同氨基酸的密码子可以以类似于原子轨道内电子的量子方式进行交换、摆动或旋转。以这种64格格式表示的是分别涵盖4个、2个或1个象限的三条变异规则:1)中心为U的必需疏水氨基酸在四个象限中的位置相同;2)两个象限中相同或相关氨基酸的相同或相邻位置;3)一个象限内的等效氨基酸。还展示了奇数和偶数密码子的数学平衡,以及与一种完全相反的生物体——植物拟南芥相比,人类中每个氨基酸最常用的密码子,这种比较描绘了第三核苷酸偏好的差异:11种氨基酸发生C/U交换,2种氨基酸发生G/A交换,以及分别有1种氨基酸发生G/U或C/A交换;通过研究每个氨基酸的这些密码子使用偏好,我们提出了两个假设:1)脊椎动物中的翻译较慢;2)无脊椎动物中的翻译较快,这可能是由于它们所生活的水环境所致。这些密码子使用偏好还可能通过比较单个mRNA及其在细胞和生物体内的功能性三维结构、运输和翻译来确定基因组兼容性。这些观察结果旨在设计生物信息学计算工具,以比较人类基因组,确定兼容密码子和氨基酸之间的交换,保护和/或恢复已灭绝的生物多样性,并早期检测导致遗传疾病的不兼容变化。