A partial trisomy of chromosome 1 in a family with a t(1q-;4q+) translocation.

A female infant with approximately one-third of the terminal portion of the 1q chromosome arm attached to the end of a 4q arm (46,XX,4q+) is described. The proposita's mother, maternal grandfather and uncle are balanced translocation carriers 46,XX or XY,t(1q-;4qf). The clinical findings were: elfin-like facies, low set ears with large pinnae, and numerous cardiac anomalies. The proposita expired at eleven weeks of age.