文档介绍：Strand Symmetry: Characteristics and Origins
Shang-Hong Zhang* and Ya-Zhi Huang
The Key Laboratory of Gene Engineering of Ministry of Education, and Biotechnology Research Center
Sun Yat-sen University
Guangzhou 510275, China
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Abstract—In order to reveal the ic information contained in and/or if the variation of its occurrence frequencies has been
the primordial genome (defined as the most primitive nucleic limited by a certain mechanism (system) since the beginning or
acid genome for Earth’s life), one of the possible means is to early stages of genome evolution, the pattern of genomic
search for primitive traits or relics remained in modern genomes. frequencies of the sequence would be conserved since the
As the shorter is a sequence, the less probable it would be primordial genome formed. From this point forward, our
modified during genome evolution. For that reason, some philosophy suggests that the conservation of the genomic
characteristics of very short nucleotide sequences would have pattern of the frequencies of mononucleotides, dinucleotides,
considerable chances to persist during billions of years of and higher-order oligonucleotides across various genomes, if it
evolution. Consequently, conservation of certain genomic exists, would probably be a relic of the primordial genome.
features of mononucleotides,