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Fig. 6. Mutation in a highly conserved Sema3C immunoglobulin domain.
Family 53 pups with PTA are homozygous for a T to C substitution (m/m
sequencing trace files, right) in the highly conserved immunoglobulin (Ig)
domain of Sema3C, which caused a leucine to proline substitution, and
also resulted in the loss of a PstI restriction site and the gain of
an AciI site. PCR amplification using primers spanning the
Sema3CL605P mutation, followed by PstI digestion
was used to genotype a litter of fetuses obtained from intercrossing two
heterozygous Sema3CL605P mutants (see bottom gel). Three
homozygous Sema3CL605Pmutants showed PTA, whereas one
heterozygous fetus had DORV.