PMC:314463 / 21142-22066 JSONTXT

Molecular Genetics of deH and Tbx15 (A) Genetic and physical map, as described in the text. Markers M1 to M3 are SSCP markers generated from a BAC contig of the region; marker M4 is STS 16.MMHAP32FLF1 and was also used as an SSCP marker. M2 and M3, which flank the Tbx15 and M6pr-ps on the UCSC genome browser map and lie 634 kb apart, were nonrecombinant with deH in 2340 meioses. (B) The deH mutation is a deletion that starts in Tbx15 intron 1 and ends in the M6pr-ps. (C) Sequence of deletion breakpoints. (D) Diagram of Tbx15LacZ allele constructed by gene targeting. As described in the text, this allele is predicted to give rise to a protein truncated after approximately 154 codons and is lacking critical residues of the T box. Heterozygotes for the targeted allele exhibit normal size, morphology, and hair-color patterns, but homozygotes and Tbx15LacZ/deH compound heterozygotes are identical to deH homozygotes.