Abstract
The chromosome translocations characteristic of certain B lymphoid tumours associate the
myc
oncogene and immunoglobulin loci. The typical t(12;15) in murine plasmacytomas and analogous t(14;8) in Burkitt lyphomas couple the
myc
coding region to one of the switch recombination regions within the immunoglobulin heavy (H) chain locus; hence the switch machinery may promote some translocations. Significantly, translocation induces constitutive
myc
expression, the untranslocated
myc
allele remaining silent. The predilection for breakpoints near the 5´ end of the
c -myc
gene may reflect selection for altered
myc
regulation. In most tumours, the stimulatory effect of the H locus context is not understood, but an H locus enhancer participates in some tumours, including one displaying a novel
transposition
. The variant (6;15) translocations found in about 15 % of plasmacytomas involve the
myc
band and the region of chromosome 6 where the
k
locus lies. The t(6;15) is shown here to represent an exchange between C
K
and a chromosome 15 locus (designated
pvt
-1) which lies unexpectedly far from
c-myc
.The association of
myc
expression with
pvt
-1 alterations suggest that
myc
can be activated at a distance.
Myc
has also been implicated in some T lymphomas by detection of proviral inserts near
myc
and also surprisingly, within the
pvt
-1 locus. Inserts near
myc
appear to activate its expression via the retroviral enhancer.
Cited by
19 articles.
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