Human Molecular Genetics, Vol 5, 1279-1288, Copyright © 1996 by Oxford University Press
SL Page, JC Shin, JY Han, KH Choo and LG Shaffer
Robertsonian translocations are the most common chromosomal rearrangements
in humans. The vast majority of the ten possible nonhomologous types of
Robertsonian translocations ascertained are rob(13q14q) and rob(14q21q).
Recombination between homologous sequences on nonhomologous chromosomes has
been proposed as a mechanism leading to the preferential formation of
rob(13q14q) and rob(14q21q). However, little evidence exists to indicate
whether the remaining less common Robertsonian translocations form through
a similar mechanism. To better elucidate the mechanisms involved in
Robertsonian translocation formation, we have used fluorescence in situ
hybridization to localize the breakpoints in 56 nonhomologous Robertsonian
translocations. This study revealed highly variable locations of
breakpoints in seven types of the less common Robertsonians, while nearly
all rob(13q14q) and rob(14q21q) analyzed displayed breakpoints in the same
locations. Therefore, this study provides direct evidence that rob(13q14q)
and rob(14q21q) form through a specific mechanism, possibly involving
homologous recombination, which is distinct from the mechanism(s) that
contributes to the formation of the remaining types of Robertsonian
translocations.
ARTICLES
Breakpoint diversity illustrates distinct mechanisms for Robertsonian translocation formation
Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA.
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