PCR-RFLP analysis - DNA amplification with the
ITS2F and ETTS1 primers generated one fragment of approximately
460 bp for all specimens (data not shown). All
samples had their profiles reproducible, but only three
specimens of each species are demonstrated here. The
Figure shows RFLP profiles obtained after digestion of
rRNA ITS2 with HpaII enzyme. From traces of shell organic
material distinct profiles were obtained for B.
glabrata (four fragments), B. straminea (two), and B.
tenagophila (four), which showed to be identical to those
obtained from their cephalopodal region.
LS-PCR - Profiles obtained through LS-PCR, for artificially
dried snails infected with S. mansoni (lanes 23-28),
were similar to the adult worm profile (lane 22), which
corresponds to the amplification of the tandem repeated
region of the 62 bp fragment from S. mansoni.