Law of genome evolution direction: Coding information quantity grows |
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Authors: | Liao-fu Luo |
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Institution: | (1) Laboratory of Theoretical Biophysics, Faculty of Science and Technology, Inner Mongolia University, Hohhot, 010021, China |
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Abstract: | The problem of the directionality of genome evolution is studied. Based on the analysis of C-value paradox and the evolution
of genome size, we propose that the function-coding information quantity of a genome always grows in the course of evolution
through sequence duplication, expansion of code, and gene transfer from outside. The function-coding information quantity
of a genome consists of two parts, p-coding information quantity that encodes functional protein and n-coding information
quantity that encodes other functional elements. The evidences on the law of the evolutionary directionality are indicated.
The needs of function are the motive force for the expansion of coding information quantity, and the information quantity
expansion is the way to make functional innovation and extension for a species. Therefore, the increase of coding information
quantity of a genome is a measure of the acquired new function, and it determines the directionality of genome evolution.
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Keywords: | genome evolution function-coding information quantity growing p-coding information quantity n-coding information quantity C-value paradox |
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