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The grammatical rule for all DNA: junk and coding sequences.

S Ohno1, T Yomo

  • 1Beckman Research Institute of the City of Hope, Department of Theoretical Biology, Duarte, CA 91010-0269.

Electrophoresis
|February 1, 1991
PubMed
Summary
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Genomic DNA, including selfish, coding, and junk DNA, follows a specific nucleotide rule, influencing protein properties and DNA strand symmetry. This rule results in palindromes that can encode identical oligopeptides on both DNA strands.

Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • Genomic DNA comprises selfish DNA, coding sequences, and junk DNA.
  • These components are interconnected and represent different life cycle phases of DNA.
  • A universal nucleotide rule governs DNA composition.

Purpose of the Study:

  • To elucidate the relationship between different DNA types (selfish, coding, junk).
  • To identify the underlying grammatical rule governing DNA sequences.
  • To explore the functional implications of this rule on protein properties and DNA structure.

Main Methods:

  • Bioinformatic analysis of genomic sequences.
  • Examination of nucleotide composition biases (TG/CA/CT excess, CG/TA deficiency).

Related Experiment Videos

  • Analysis of DNA palindromes and their encoded oligopeptides.

    • Main Results:

    • All DNA types (selfish, coding, junk) adhere to a TG/CA/CT excess and CG/TA deficiency rule.
    • This rule maintains the isoelectric points of most proteins near neutral.
    • The rule promotes the formation of palindromes, ensuring strand symmetry and encoding identical oligopeptides.

    Conclusions:

    • Selfish DNA, coding sequences, and junk DNA are unified by a common DNA grammatical rule.
    • This rule has significant implications for protein physicochemical properties and genome stability.
    • The rule facilitates the encoding of identical oligopeptides through palindromic sequences.