Disruption of the DAT and SERT genes and effects on weights at 2
months. (A) Southern analysis of hybridization of the 3′
SERT genomic probe to KpnI-digested DNA extracted from
tail tips of seven mice displaying wild-type (+/+, lane 3),
heterozygote (+/−, lanes 4, 5, 7), and homozygote (−/−, lanes 1,
2, 6) patterns. The presence of an 8.1-kb fragment indicates a
homozygous mutant genotype, whereas wild-type fragments are 9.6
kb32. (B) Southern analysis of hybridization
of the 5′ DAT genomic probe to EcoRI-digested DNA
extracted from tail tips of seven mice displaying wild-type (+/+,
lane 7), heterozygote (+/−, lanes 2, 3, and 6), and homozygote
(−/−, lanes 1, 4, and 5) patterns. The presence of a 5.3-kb
fragment indicates the homologous recombinant genotype, whereas
wild-type fragments are 6.0 kb9. (C) Weights
of mice of each genotype at 8 weeks of age. Mean (± SEM;
n, 5–30) values for weights were compared by using
ANOVA followed by Scheffe post hoc analyses; *, significantly
different from wild type; #, significantly different from DAT−/−
SERT+/+; P < 0.05 for each.