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Start/stop codon like trinucleotides extensions in primate alpha satellites.

Marija Rosandić1, Matko Glunčić, Vladimir Paar

  • 1Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia. rosandic@hazu.hr

Journal of Theoretical Biology
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Summary

Researchers identified species-specific alpha satellite higher-order repeats in primate chromosome 5. They also discovered novel regulatory elements, Codon Like Trinucleotides (CLTs), in noncoding DNA sequences.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Centromeres are rapidly evolving regions in primate genomes, containing alpha satellite (AS) higher-order repeats (HORs).
  • Noncoding sequences, including AS, may play significant regulatory roles in gene expression.

Purpose of the Study:

  • To identify species-specific AS HORs in primate chromosome 5.
  • To investigate the structure of AS arrays and explore novel regulatory elements in noncoding DNA.

Main Methods:

  • Utilized the Global Repeat Map (GRM) algorithm to analyze NCBI genome assemblies.
  • Classified AS HORs and surrounding sequences using suprachromosomal family (SF) categorization.
  • Analyzed Codon Like Trinucleotides (CLTs) in noncoding sequences.

Main Results:

  • Identified distinct AS HOR repeat numbers (13mer in human, 5mer in chimpanzee, 14mer in orangutan, 3mer in macaque) in chromosome 5.
  • Revealed specific segmental structures within major AS arrays across primate species.
  • Characterized species-specific differences in CLT extensions, particularly stop-TGA CLTs.

Conclusions:

  • Species-specific AS HORs and unique segmental structures exist in primate chromosome 5.
  • Codon Like Trinucleotides (CLTs) represent a potential new regulatory mechanism in noncoding DNA.
  • CLTs may influence protein genesis by modulating start/stop codon activity from a distance.