Replication and inactivation of and isodicentric X: presence of an inactive centromere influences the replication patterns

Abstract
An isodicentric X-chromosome (idic(X)(pter .fwdarw. q23::q23 .fwdarw. pter)) was found in a phenotypically normal 30-yr-old female with symptoms of premature menopause. A study of DNA replication revealed that in a proportion of cells there was an asymmetric pattern of replication. The region with the inactive centromere had a tendency to replicate later than the portion with the functioning centromere.