Lubag (X-linked dystonia-parkinsonism) has been considered a sex-linke
d recessive trait and has been mapped to the pericentromeric region of
the X chromosome. We studied a 54-year-old man with lubag and two of
his female first cousins. Genetic typing was carried out using X chrom
osome markers. Fluorodopa PET was performed on the man and one of the
women. The man had moderately severe parkinsonism and dystonia. A 61-y
ear-old female first cousin had mild left-sided dystonia and her 54-ye
ar-old sister had mild generalized chorea. Genetic typing data reveale
d that all three inherited an X chromosome with marker alleles strongl
y associated with lubag. Cytologic analysis did not reveal evidence of
X chromosomal deletion. Fluorodopa PET in both the man and one affect
ed cousin revealed reduced striatal uptake rate constants consistent w
ith nigrostriatal involvement. These observations suggest that lubag m
ay be a codominant disorder and that it is possible for women to be af
fected.