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The Central Dogma01:20

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The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
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Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
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The structure of the genetic code as an optimal graph clustering problem.

Paweł Błażej1, Dariusz R Kowalski2, Dorota Mackiewicz3

  • 1Department of Genomics, Faculty of Biotechnology, University of Wrocław, ul. Joliot-Curie 14a, Wrocław, Poland. pawel.blazej@uwr.edu.pl.

Journal of Mathematical Biology
|July 15, 2022
PubMed
Summary

The standard genetic code

Keywords:
Code degeneracyGraph theorySet conductanceStandard genetic code

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Area of Science:

  • Genetics
  • Bioinformatics
  • Graph Theory

Background:

  • The standard genetic code (SGC) translates nucleotide codons into amino acids, but its origin and structure remain debated.
  • Assessing the optimality of the SGC's structure is crucial for understanding its evolution.

Purpose of the Study:

  • To introduce a novel graph theory-based approach for evaluating the quality of the genetic code structure.
  • To analyze the robustness of codon groups against nucleotide substitutions using conductance.

Main Methods:

  • Described the genetic code as a partition of an undirected, unweighted graph.
  • Applied graph theory concepts, specifically conductance, to measure the robustness of codon groups.
  • Investigated the genetic code structure as a solution to the graph clustering problem.

Main Results:

  • The proposed methodology reveals new properties of the genetic code in terms of conductance.
  • The standard genetic code, while not globally optimal by conductance, exhibits many codon groups with minimal conductance for their size.
  • Optimal code structures according to conductance were identified and discussed.

Conclusions:

  • The genetic code structure can be understood as a solution to a graph clustering problem.
  • The SGC's structure may represent a local minimum for minimizing errors in protein-coding sequences and translation.