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Related Experiment Videos

Construction of a swine artificial chromosome: a novel vector for transgenesis in the pig.

Paola Poggiali1, Gian Luca Scoarughi, Marialuisa Lavitrano

  • 1Dipartimento di Biologia Cellulare e dello Sviluppo, University of Rome La Sapienza, Via dei Sardi, 70, Italy.

Biochimie
|February 22, 2003
PubMed
Summary

Researchers created a stable synthetic artificial chromosome (SAC) using yeast artificial chromosome (YAC) technology. This novel YAC-based SAC is episomal, mitotically stable, and shows potential for animal transgenesis applications.

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Area of Science:

  • Synthetic biology
  • Genetics
  • Molecular biology

Background:

  • Yeast artificial chromosome (YAC) technology enables the construction of large DNA constructs.
  • Humanized yeast strains facilitate the manipulation of complex genetic material.

Purpose of the Study:

  • To construct a de novo synthetic artificial chromosome (SAC) using YAC technology.
  • To evaluate the stability and characteristics of the SAC in a mammalian cell line.
  • To explore potential applications in animal transgenesis.

Main Methods:

  • Construction of a 310 kb SAC containing pig centromeric DNA and the Neo gene using YAC technology.
  • Introduction of the SAC into a pig cell line via yeast-mammalian cell fusion.
  • Analysis of SAC integration, stability, and structure using fluorescence in situ hybridization (FISH), confocal microscopy, and pulsed field gel electrophoresis.

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Main Results:

  • Obtained G418 resistant clones containing an episomal microchromosome with YAC, Neo, and pig centromere sequences.
  • Demonstrated mitotic stability of the SAC for at least 34 generations without selection.
  • Determined the SAC size to be approximately 7 Mb, a 25-fold increase from the original YAC, indicating circularization and multimerization.

Conclusions:

  • The constructed SAC is a stable, episomal, circularized, and multimerized derivative of the original YAC.
  • The SAC exhibits significant mitotic stability in a pig cell line.
  • The YAC-based SAC holds promise as a novel vector for animal transgenesis.