CHORIONIC DNA ANALYSIS FOR THE PRENATAL-DIAGNOSIS OF FAMILIAL HYPERCHOLESTEROLEMIA

Prenatal diagnosis for familial hypercholesterolaemia (FH) was perform ed by using restriction fragment length polymorphisms (RFLPs) of the L DL receptor gene on chorionic villi DNA taken during the 10th week of pregnancy. Both parents were FH heterozygotes and had previously had a healthy son and an FH homozygous son. Two RFLPs were informative in t his family and revealed that the fetus was unaffected by FH. At birth the child was found to have an LDL cholesterol level of 30 mg/dl and a normal LDL receptor activity in cultured umbilical cord fibroblasts. RFLP analysis on chorionic villi DNA is highly recommended for all het erozygous FH couples in whom the LDL receptor gene mutation/s is/are s till to be characterized.