I. Nanda et al., LOSS OF TELOMERIC SITES IN THE CHROMOSOMES OF MUS-MUSCULUS-DOMESTICUS(RODENTIA, MURIDAE) DURING ROBERTSONIAN REARRANGEMENTS, Chromosome research, 3(7), 1995, pp. 399-409
Mouse chromosomes possessing multiple Robertsonian rearrangements (Rb
chromosomes) have been examined using fluorescence in situ hybridizati
on with the telomeric consensus sequence (TTAGGG)(n). No hybridization
signals were detected at the primary constriction of Rb chromosomes.
This observation leads us to conclude that the formation of Rb chromos
omes in the mouse is invariably associated with the loss of telomeric
regions. More significantly, a further alteration in regions flanking
the primary constrictions was observed after hybridizing with a minor
satellite DNA probe to Rb chromosomes. It seems likely that the breakp
oints required for a Robertsonian process do not include telomeric sit
es exclusively but extend to the adjacent pericentromeric regions of t
he original acrocentric chromosomes. In contrast to previous reports,
these observations demonstrate the elimination of substantial amounts
of chromosomal DNA during the formation of mouse Rb chromosomes.