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Interstitial deletion of chromosome 9q with coexistence of the deleted segment as a ring chromosome. A case report
R A Pfeiffer1, U Trautmann, R Hirmer-Stoll
1Institut für Humangenetik, Friedrich-Alexander Universität Erlangen-Nürnberg, Germany.
Annales De Genetique
|January 1, 1991
Abstract:
In a mentally retarded female an interstitial deletion of a chromosome 9 and an additional ring chromosome was shown, which by positive hybridisation with a no 9 library was considered to be the excised segment. The functional centromere and C and DA/DAPI positive material as well on the ring chromosome are explained by a break within the centromere close to the constitutive heterochromatin and supports the hypothesis of "latent" centromere(s).