Analysis of extrachromosomal structures containing human centromeric alphoid satellite DNA sequences in mouse cells |
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| Authors: | Stephen S Taylor Zoia Larin Chris Tyler-Smith |
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| Institution: | (1) CRC Chromosome Molecular Biology Group, Department of Biochemistry, University of Oxford, South Parks Road, OX1 3QU Oxford, UK;(2) Present address: Department of Cell Biology, Harvard Medical School, 240 Longwood Aveneue, 02115 Boston, MA, USA;(3) Present address: Institute of Molecular Medicine, John Radcliffe Hospital, Headington, OX3 9DU Oxford, UK |
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| Abstract: | Yeast artificial chromosomes (YACs) spanning the centromeric region of the human Y chromosome were introduced into mouse LA-9
cells by spheroplast fusion in order to determine whether they would form mammalian artificial chromosomes. In about 50% of
the cell lines generated, the YAC DNA was associated with circular extrachromosomal structures. These episomes were only present
in a proportion of the cells, usually at high copy number, and were lost rapidly in the absence of selection. These observations
suggest that, despite the presence of centromeric sequences, the structures were not segregating efficiently and thus were
not forming artificial chromosomes. However, extrachromosomal structures containing alphoid DNA appeared cytogenetically smaller
than those lacking it, as long as yeast DNA was also absent. This suggests that alphoid DNA can generate the condensed chromatin
structure at the centromere.
Edited by: H. F. Willard |
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