A case of X-autosome translocation was diagnosed prenatally [46,X,t(X;9)(p2
1.3 similar to 22.1;q22]. We describe the use of fluorescence in situ hybri
dization (FISH) to estimate the integrity of the Duchenne muscular dystroph
y (DMD) gene. X-inactivation studies were used as well to assess the probab
ility of phenotypic abnormalities associated with functional partial disomy
X and monosomy. (C) 1999 Wiley-Liss, Inc.