A new mouse limb mutation identifies a Twist allele that requires interacting loci on chromosome 4 for its phenotypic expression.
Pluridigite ( Pdt) is a semi-dominant mutation obtained after a mutagenesis experiment with ethyl-nitroso-urea (ENU). The mutant exhibits abnormal skeletal pattern formation characterized by the formation of extra digits (polydactyly) in the preaxial (anterior) part of the hindlimbs. The phenotype shows incomplete penetrance, depending on the genetic background. In an F2 cross with C57BL/6, the phenotype could not be associated with a single locus. Strong linkage was observed with markers located on Chromosome (Chr) 12, in a 2-cM interval between D12Mit136 and D12Mit153. This region contains the Twist gene, and we show that the [Pdt] phenotype is dependent upon a new allele of Twist. We further identified that the whole Chr 4 is associated with the [Pdt] phenotype. The Pluridigite phenotype thus results from the combination of a Twist mutant allele and at least two additional loci.
Blanc
Isabelle
I
Unité Postulante de Génétique Moléculaire de la Morphogenèse, URA CNRS 2578, Institut Pasteur, 25 rue du Dr Roux, 75724 Paris Cedex 15, France.
Bach
Antoine
A
Lallemand
Yvan
Y
Perrin-Schmitt
Fabienne
F
Guénet
Jean-Louis
JL
Robert
Benoît
B
D000483:Alleles; D000818:Animals; D002874:Chromosome Mapping; D033481:Chromosomes, Mammalian / Q000235:genetics*; D003433:Crosses, Genetic; D017931:DNA Primers; D005038:Ethylnitrosourea; D005799:Genes, Dominant / Q000235:genetics; D017403:In Situ Hybridization; D008565:Membrane Proteins / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D018895:Microsatellite Repeats / Q000235:genetics; D009154:Mutation / Q000235:genetics*; D018006:Myogenic Regulatory Factors / Q000235:genetics; D009687:Nuclear Proteins / Q000235:genetics; D000072079:Patched Receptors; D010641:Phenotype; D017689:Polydactyly / Q000235:genetics*; D011956:Receptors, Cell Surface; D017422:Sequence Analysis, DNA; D051879:Twist-Related Protein 1
D017931:DNA Primers; D008565:Membrane Proteins; D018006:Myogenic Regulatory Factors; D009687:Nuclear Proteins; D000072079:Patched Receptors; D011956:Receptors, Cell Surface; D051879:Twist-Related Protein 1; C067250:Twist1 protein, mouse; D005038:Ethylnitrosourea