PuSH - Publikationsserver des Helmholtz Zentrums München: Telomere Signals in Robertsonian Fusion and Fission Chromosomes: Implications for the Origin of Pseudoaneuploidy.

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Schubert, I. ; Schriever-Schwemmer, G. ; Werner, T. ; Adler, I.-D.

Telomere Signals in Robertsonian Fusion and Fission Chromosomes: Implications for the Origin of Pseudoaneuploidy.

Cytogenet. Genome Res. 59, 6-9 (1992)

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In situ hybridization with synthetic plant telomeric sequences resulted in labeling of all broad bean (Vicia faba) chromosomes at their ends only. Telocentric chromosomes derived by fission of the metacentric satellite chromosome of V. faba also showed signals at both of their ends, whereas the ancestral metacentric did not display signals at its primary constriction, the point of fission. As in V. faba, all acrocentric mouse chromosomes were labeled by in situ hybridization with a vertebrate telomeric probe at both ends of each chromatid exclusively. However, different metacentric Robertsonian chromosomes derived by fusion of defined acrocentrics did not show signals at their primary constrictions. The mechanism of Robertsonian rearrangement leading to a pseudoaneuploid increase or decrease in chromosome number therefore cannot consist solely of a simple fission or fusion of chromosomes without a concomitant gain or loss of chromatin material. The additional assumption of a subdetectable deletion of telomeric sequences after fusion and amplification of these sequences following fission is necessary to explain the present observations.

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