Nucleotide Fluctuation Analysis of Dim-Light Vision Rhodopsin Gene and mRNA Sequences in Vertebrates

Fractal dimension and Shannon entropy were used to analyze the nucleotide fluctuation of dim-light vision rhodopsin gene. The maximal absorption wavelengths of the studied gene sequences span a range of 480 nm to 526 nm. The di-nucleotide Shannon entropy correlates with (a) the mono-nucleotide Shannon entropy with R² of 0.99; (b) the CG+GC content with R² of 0.86 (N = 6). The absorption maximal wavelength correlation with the CG+GC content was found to have an R² of 0.82 for the gene sequence and 0.91 for the mRNA sequence. The fractal dimensions of the gene sequences and mRNA sequences were found to be correlated with R² of 0.78. Selection pressure on the CG+GC content at the gene and mRNA levels would be a consistent observation for phenotype dim-light functionality.