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Establishment of Smad2 conditional gene targeting mice based on the Cre-LoxP system

Jiang Zhou1, Xuan Cheng, Yanxun Sun

  • 1Genetic Laboratory of Development and Diseases, Institute of Biotechnology, 100071, Beijing, China.

Science in China. Series C, Life Sciences
|September 3, 2008
PubMed

Insights

Researchers developed a Smad2 conditional gene targeting mouse model. This tool enables studying Smad2 gene function in specific tissues, crucial for understanding organ development and cancer.

Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • Smads are key components of the transforming growth factor-beta (TGF-β) signaling pathway.
  • Smad2 mutations are implicated in human tumors, suggesting a role as a tumor suppressor gene.
  • Complete Smad2 gene disruption in mice leads to early embryonic lethality, hindering functional studies.

Purpose of the Study:

  • To create a conditional gene targeting system for Smad2 to overcome embryonic lethality.
  • To enable the investigation of Smad2 function in vertebrate organogenesis and tumorigenesis.
  • To establish a foundation for generating tissue-specific Smad2 knockout mouse models.

Main Methods:

  • Construction of a Smad2 conditional targeting vector with flanking LoxP sites.
  • Validation of LoxP site functionality using Cre recombinase in E. coli.
  • Electroporation of the vector into ES cells, followed by Southern blot screening for targeted clones.
  • Generation of germ-line chimeras via microinjection of targeted ES cells into C57BL/6J blastocysts.
  • Genotyping of progeny to identify animals carrying the Smad2 conditional targeted allele.

Main Results:

  • Successfully constructed and validated a Smad2 conditional targeting vector.
  • Identified three targeted ES cell clones.
  • Generated germ-line chimeras, with two offspring confirmed to carry the Smad2 conditional targeted allele.

Conclusions:

  • The development of the Smad2 conditional gene targeting mouse model is a significant advancement.
  • This model provides a robust platform for future research into Smad2's role in development and disease.
  • It facilitates the creation of tissue-specific Smad2 knockout mice for detailed functional analysis.

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