A 5 kb region of the gene encompassing exon 3 was replaced with a PGK-neo cassette via homologous recombination resulting in deletion of the second zinc finger of the DNA-binding domain. RT-PCR analysis of intestines and kidneys from homozygous mutant animals detected a mutant transcript. Sequence analysis revealed a 131 bp deletion corresponding to the second zinc finger and results in a frameshift and nonsense codon 12 bp downstream. (J:42815)