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Novel porcine repetitive elements.

Ralph T Wiedmann1, Dan J Nonneman, John W Keele

  • 1USDA, ARS U, S, Meat Animal Research Center, Clay Center, NE, USA. wiedmann@email.marc.usda.gov

BMC Genomics
|December 5, 2006
PubMed
Summary

Researchers identified 27 novel repetitive DNA elements in the pig genome, with some present in cattle, aiding livestock genome assembly and comparative genomics. These elements impact genomic architecture and evolution.

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Area of Science:

  • Genomics
  • Comparative Genomics
  • Molecular Evolution

Background:

  • Repetitive elements constitute ~45% of mammalian genomes.
  • These elements influence genomic architecture, gene regulation, size, diversity, and evolution.
  • Accurate identification and annotation of repetitive DNA are crucial.

Purpose of the Study:

  • To identify previously uncharacterized repetitive DNA in the porcine genome.
  • To characterize the prevalence of these novel repeats in other mammalian genomes.

Main Methods:

  • Screening of 220 bacterial artificial chromosomes (BACs) from the porcine genome.
  • Analysis of BAC-end sequences for repeat copy number estimation.
  • Comparative analysis against bovine, primate, rodent, and dog genomes.

Main Results:

  • Discovery of 27 novel repetitive elements in the pig genome.
  • Copy number estimates ranged from <100 to 10,000 per element.
  • Two elements showed orthologous sites in the bovine genome, suggesting ancient origins.
  • No identified repeats were found in primate, rodent, or dog genomes.
  • Replication machinery typical of active transposable elements was absent.

Conclusions:

  • Some identified repetitive elements predate mammalian speciation, while others arose later.
  • Low to moderate copy number repetitive DNA specific to artiodactyls is important for livestock genome assembly.
  • Findings are critical for advancing livestock genome assembly and comparative genomics studies.

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