A hypermorphic mouse Gli3 allele results in a polydactylous limb phenotype. Academic Article uri icon

Overview

MeSH

  • Alleles
  • Animals
  • Body Patterning
  • Fluorescent Antibody Technique
  • Gene Expression Regulation, Developmental
  • Immunoblotting
  • In Situ Hybridization
  • Mice
  • Mice, Mutant Strains
  • Models, Genetic
  • Phenotype

MeSH Major

  • Kruppel-Like Transcription Factors
  • Limb Buds
  • Nerve Tissue Proteins
  • Polydactyly

abstract

  • Gli3 protein processing to generate the Gli3 repressor is mediated by proteasome and inhibited by Hedgehog signaling. The Gli3 repressor concentration is graded along the anterior-posterior axis of the developing vertebrate limb due to posteriorly restricted Sonic hedgehog expression. In this study, we created a small deletion at the Gli3 locus (Gli3(Delta68)), which causes a half reduction in the Gli3 repressor levels and a slightly increased activity of full-length mutant protein in the limb. Mice homozygous for Gli3(Delta68) develop one to two extra partial digits in the anterior of the limb, while mice carrying one copy of the Gli3(Delta68) allele die soon after birth and display seven digits. These phenotypes are more severe than those found in mice lacking one wild-type Gli3 allele. The expression of dHand, Hoxd12, and Hoxd13 is anteriorly expanded in the limb, even though no up-regulation of Gli1 and Ptc RNA expression is detected. These findings suggest that a decrease in the Gli3 repressor level in combination with an increase in Gli3 full-length activity results in more severe digit patterning abnormalities than those caused by a loss of one wild-type Gli3 allele.

publication date

  • March 2007

has subject area

  • Alleles
  • Animals
  • Body Patterning
  • Fluorescent Antibody Technique
  • Gene Expression Regulation, Developmental
  • Immunoblotting
  • In Situ Hybridization
  • Kruppel-Like Transcription Factors
  • Limb Buds
  • Mice
  • Mice, Mutant Strains
  • Models, Genetic
  • Nerve Tissue Proteins
  • Phenotype
  • Polydactyly

Research

keywords

  • Journal Article

Identity

Language

  • eng

Digital Object Identifier (DOI)

  • 10.1002/dvdy.21082

PubMed ID

  • 17266131

Additional Document Info

start page

  • 769

end page

  • 776

volume

  • 236

number

  • 3