Journal
MAMMALIAN GENOME
Volume 13, Issue 4, Pages 186-188Publisher
SPRINGER
DOI: 10.1007/s00335-001-2142-7
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As a result of transgenic insertional mutagenesis, heterozygous Fused toes (Ft) mice display a syndactyly of forelimbs and a thymic hyperplasia. Homozygous Ft/Ft embryos die in midgestation, exhibiting a deformation of craniofacial structures, a syndactyly and a polydactyly of fore- and hindlimbs, a disorganization of the ventral spinal cord, and defects in left-tight axis formation. Here we report on our structural analyses of the Ft mutation. We established a physical as well as a gene map of the Ft locus, showing that the transgene integration resulted in a deletion of 1.6 Mb of genomic sequences on mouse Chromosome 8. Owing to this deletion, six genes, including the entire IroquoisB (IrxB) gene cluster, are directly affected by the Ft mutation.
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