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Related Experiment Videos

A highly repetitive DNA sequence possibly unique to canids.

M F Minnick1, L C Stillwell, J M Heineman

  • 1Pacific Northwest Laboratories, Richland, WA 99352.

Gene
|January 15, 1992
PubMed
Summary

Researchers identified a novel short interspersed nucleotide (SINE) element in domestic dog (Canis familiaris) genomes. This canine-specific SINE appears widely dispersed and may be unique to canids, offering insights into genome evolution.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Comparative Genomics

Background:

  • Short interspersed nucleotide elements (SINEs) are mobile genetic components found in eukaryotic genomes.
  • Understanding SINE distribution and characteristics provides insights into genome structure and evolution.

Purpose of the Study:

  • To clone and characterize a novel SINE element from the domestic dog (Canis familiaris).
  • To investigate the genomic distribution and potential species specificity of this SINE element.

Main Methods:

  • Cloning of SINE element from canine genomic DNA.
  • Southern-blot analysis to assess genomic dispersion.
  • DNA sequencing of SINE instances.
  • Bioinformatic searches for homologous sequences in canine genes.

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Main Results:

  • A 130-bp SINE element was identified in Canis familiaris.
  • Southern blots revealed widespread genomic dispersion of the SINE.
  • Hybridization studies suggest the SINE may be canid-specific, absent in other mammals.
  • Sequenced SINEs contain putative RNA polymerase III control sequences and are flanked by repetitive regions.
  • Homologous sequences found in untranslated regions of canine interferon-omega and clotting factor IX genes.

Conclusions:

  • A novel, potentially canid-specific SINE element has been characterized in the domestic dog.
  • The SINE's dispersed nature and presence in gene regulatory regions suggest functional significance.
  • Further research can explore the role of this SINE in canine genome evolution and gene regulation.