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Mouse Wnt9b transforming activity, tissue-specific expression, and evolution.

JunQing Qian1, Zhaorong Jiang, Min Li

  • 1Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.

Genomics
|February 8, 2003
PubMed
Summary
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This study analyzes mouse Wnt9b, revealing its gene sequence, chromosomal location, and expression patterns in adult and embryonic tissues. Wnt9b shows oncogenic potential in mammary epithelial cells, suggesting roles in development and disease.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • The Wnt family of secreted factors are crucial developmental regulators with known oncogenic potential.
  • Understanding Wnt gene function is vital for insights into developmental processes and cancer biology.

Purpose of the Study:

  • To characterize the mouse Wnt9b gene, including its sequence, mapping, expression, and functional activity.
  • To investigate the evolutionary relationship of Wnt9b with other Wnt genes.

Main Methods:

  • cDNA sequencing and analysis.
  • Chromosomal mapping using a mouse backcross panel.
  • Expression analysis via Northern blotting and in situ hybridization.
  • Epithelial cell transformation assays.

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Main Results:

  • The full cDNA sequence and amino acid sequence of Wnt9b were determined.
  • Wnt9b was mapped to mouse chromosome 11.
  • Expression is primarily in adult kidney, with embryonic expression peaking at 10.5 days.
  • Overexpression induced moderate transformation in mammary epithelial cells.

Conclusions:

  • Wnt9b is a paralog of Wnt9a, with both originating from a recent gene duplication event.
  • Wnt9b exhibits oncogenic potential, particularly in mammary epithelial cells.
  • Wnt9b plays a role in mouse embryonic development and has specific adult tissue expression patterns.