Two Spanish sibs with familial amyloidotic polyneuropathy (FAP) homozygous
for the V30M-TTR gene, were diagnosed by DNA and protein analyses. Their cl
inical picture was very similar to the Majorcan FAP heterozygous patients e
xcept for the sensorimotor syndrome which was more aggressive. Noteworthy w
ere clinical differences between the sibs concerning autonomic involvement,
cranial neuropathy and kidney disturbances. These differences can be due t
o genetic and/or environmental factors.