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- W1897408023 abstract "The problem of differentiating the informational content of coding (exons) and non-coding (introns) regions of a DNA sequence is one of the central problems of genomics. The introns are estimated to be nearly 95% of the DNA and since they do not seem to participate in the process of transcription of amino-acids, they have been termed “junk DNA.” Although it is believed that the non-coding regions in genomes have no role in cell growth and evolution, demonstration that these regions carry useful information would tend to falsify this belief. In this thesis, we consider entropy as a measure of information by modifying the entropy expression to take into account the varying length of these sequences. Exons are usually much shorter in length than introns; therefore the comparison of the entropy values needs to be normalized. A length correction strategy was employed using randomly generated nucleonic base strings built out of the alphabet of the same size as the exons under question. The distance between exons and introns is calculated based on their probability distributions. We found that Zipf’s distribution was not followed by the n-tuples in DNA sequences, and a newly modified power distribution derived from the Zipf’s distribution was found by trial and error that closely modeled the codon frequencies. Correlation and divergence tests were performed. Our analysis shows that introns carry nearly as much of information as exons, disproving the notion that they do not carry any information. The entropy findings of this thesis are likely to be of use in further study of other challenging works like the analysis of symmetry models of the genetic code." @default.
- W1897408023 created "2016-06-24" @default.
- W1897408023 creator A5080148937 @default.
- W1897408023 date "2022-06-16" @default.
- W1897408023 modified "2023-09-29" @default.
- W1897408023 title "Information analysis of DNA sequences" @default.
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- W1897408023 doi "https://doi.org/10.31390/gradschool_theses.1079" @default.
- W1897408023 hasPublicationYear "2022" @default.
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