Prenatal diagnosis in Pelizaeus-Merzbacher disease using RFLP analysis.

Pelizaeus-Merzbacher disease (PMD) is a rare X-linked recessive disorder with severe psychomotor retardation and neurological symptoms due to an inborn abnormality of proteolipid protein (PLP), the major protein component of myelin. A tight linkage between the gene of PLP and PMD locus has been suggested. We have carried out a series of RFLP studies using a cDNA probe for PLP and an anonymous DNA-fragment DXYS12 in a large Finnish family with at least three affected individuals. DNA analysis on chorionic villus specimens allowed us to exclude the disease in a male fetus of a possible carrier mother and, likewise, to demonstrate carrier status in a female fetus in another at-risk pregnancy.