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Periodicities of dinucleotide self-information values in phi X174 DNA
Zeitschrift Fur Naturforschung. Section C, Biosciences
|March 1, 1982
Summary
The bacteriophage phi X174 DNA sequence exhibits non-random patterns in dinucleotide self-information. This periodicity, detected through autocorrelation, is robust against random nucleotide changes, revealing inherent sequence structure.
Area of Science:
- Genomics
- Bioinformatics
- Molecular Biology
Background:
- DNA sequences are often analyzed for patterns beyond simple base composition.
- Dinucleotide frequencies and their information content can reveal underlying sequence biases.
Purpose of the Study:
- To investigate the non-randomness of the bacteriophage phi X174 DNA sequence using dinucleotide self-information.
- To assess the impact of sequence randomization on detected periodicities.
Main Methods:
- Analysis of dinucleotide self-information values along the phi X174 DNA sequence.
- Application of autocorrelation and harmonic analysis to identify periodic features.
- Testing sequence randomization effects on dinucleotide self-information periodicity.
Main Results:
- A strong periodicity of 3 nucleotides was detected in dinucleotide self-information values.
- This periodicity was largely maintained when one or two nucleotides within triplets were randomized.
- Randomizing specific nucleotide positions or entire triplets disrupted the periodicity.
Conclusions:
- The bacteriophage phi X174 DNA sequence possesses a significant, easily detectable non-random structure at the dinucleotide level.
- The observed periodicity is linked to specific nucleotide arrangements within triplets, particularly in protein-coding frames.
- Dinucleotide self-information analysis provides a sensitive method for detecting sequence non-randomness and structural biases.