Linkage analysis of the Rett syndrome using human chromosomal specific probes.

Restriction fragment length polymorphic (RFLP) human DNA probes have been used for linkage analysis in families with the Rett syndrome. A cytogenetic marker could be detected in 6 out of 14 cases of the Rett syndrome in the region of Xp22, and a deletion was seen in one severe case. Informative results were obtained with two of the chromosomal specific DNA probes, 99.6 and D2, in two different families.