Persistence of Hemoglobin F in D/D Translocation With Trisomy 13-15 (D1)

AMONG THE NUMEROUS translocations reported in man, one of the most frequently observed involves centric fusion of two D (13-15) chromosomes. D/D translocations may be "sporadic" as well as familial, ie, showing heritable transmission of the translocation in the heterozygous state. We report a D1trisomic individual in a family segregating for a D/D translocation. Possible linkage relationships between blood group and serum factors and the translocation chromosome were investigated. Persistence of an abnormally high concentration of hemoglobin F was found and the significance of this apparently constant feature of the trisomy 13-15 (D1) syndrome is briefly discussed. Report of a Case The proband was aged six to eight months at the time these studies were being carried out. She was the product of the fourth pregnancy and has two brothers alive and well; the remaining pregnancy ended in abortion. Delivery occurred at full term and was normal.