The report presents a family ascertained through recurrent spontaneous
abortions in which a new heritable fragile site located at 1q41 is se
gregating. The fragile site is present in the mother and her son. It i
s expressed spontaneously in 100% of the metaphases from lymphocyte cu
lture using standard conditions. The use of folate deficient medium an
d the addition of FUdR to the medium did not affect the appearance nor
the level of expression of the fragile site. (C) 1995 Wiley-Liss, Inc
.