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Related Experiment Videos

The role of the genetic code in generating new coding sequences inside existing genes

S Cebrat1, P Mackiewicz, M R Dudek

  • 1Institute of Microbiology, Wrocław University, Poland. cebrat@angband.microb.uni.wroc.pl

Bio Systems
|April 17, 1998
PubMed
Summary

The genetic code may facilitate gene evolution by creating antisense open reading frames (A-ORFs) within coding sequences. These A-ORFs share gene-like features, suggesting a potential evolutionary mechanism for new genes.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • The genetic code exhibits a property where antisense strands can generate open reading frames (A-ORFs) within coding sequences at a higher probability than random DNA.
  • These A-ORFs share characteristics with functional genes, such as nucleotide composition asymmetry in codon positions.

Purpose of the Study:

  • To investigate whether the genetic code's property of generating A-ORFs has been utilized in gene evolution.
  • To explore the potential origin of genes through duplication and antisense transcription.

Main Methods:

  • Searched FASTA databases for homologies between antisense translation products of specific genes and other sequences.
  • Analyzed homology scores to assess the statistical significance of observed matches.

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Main Results:

  • Identified sequences with significant homology to antisense translation products.
  • Many identified homologies had statistical scores (p < 10^-6) unlikely to occur by chance.

Conclusions:

  • The findings suggest that some genes may have originated from existing genes by being repositioned under a promoter in the reverse orientation.
  • This process could lead to the co-option of the antisense strand, potentially leveraging the degeneracy of the genetic code.