Vi. Kashuba et al., A GROUP OF NOTI JUMPING AND LINKING CLONES COVER 2.5 MB IN THE 3P21-P22 REGION SUSPECTED TO CONTAIN A TUMOR-SUPPRESSOR GENE, Cancer genetics and cytogenetics, 81(2), 1995, pp. 144-150
The chromosomal region 3p21.2-p22 has been shown to be involved in the
development of several forms of solid tumors. Such deletions, translo
cations, and rearrangements presumably result in the disturbance or lo
ss of a critical gene function. Pulsed-field gel electrophoresis (PFGE
), using NotI linking clones as a probe represent a powerful tool for
analyzing such rearrangements. A NotI linking clone, AP20 (D3S1641), w
as localized by in situ hybridization to 3p21.3-p22. Two NotI jumping
clones adjacent to this clone were isolated, clone J32-612 covering 0.
5 Mb and clone J31-611 covering approximately 1 Mb. Clone J31-611 cros
ses the border of the deletion present in hybrid cell line MCH939.2, w
hich contains a deleted 3p21 region. For these jumping clones, corresp
onding NotI linking clones, NLJ3 (D3S1642) and NL3-003, were isolated.
Altogether, Linking and jumping clones from the AP20 locus hybridize
to NotI fragments totaling 2.5 Mb in length. These NotI-containing clo
nes defect expressed sequences in several human tissues. Clone NLJ3 po
ssesses homology to the human platelet-derived endothelial cell growth
factor gene and may represent a new member of this gene family Anothe
r done (AP20) revealed 66% sequence similarity to rat skeletal muscle
voltage-sensitive sodium channel subtype 2. Therefore, this group of c
lones will be useful not only for analyzing rearrangements in tumors,
but also for the isolation of new genes from the 3p21.3-p22 region.