t(2;8) variant translocation in Burkitt's lymphoma: mapping of chromosomal breakpoints by in situ hybridization.
In 6 different Burkitt lymphoma cell lines with t(2;8) variant translocations (J1, LY66, LY91, BL21, BL64, JBL2) the breakpoints on chromosome 8q+ were mapped in relation to each other and to c-myc by in situ hybridization. The probes used were derived from chromosome 8q24 and comprised a c-myc probe, a probe located 48 kb downstream of c-myc, 3 probes adjacent to the chromosomal breakpoints of BL64, LY91 and JBL2, respectively, and 2 probes located in the 5' and 3' part of the thyroglobulin gene. The breakpoints of LY91 and JBL2 lie less than 200 kb and greater than 200 kb downstream of c-myc, whereas the distance to c-myc of the BL64 breakpoint and of the thyroglobulin probes is unknown. By recording the hybridization signals specific for these probes on chromosomes 2p- and 8q+ of each cell line it was possible to establish the order of breakpoints on band 8q24 relative to the c-myc and thyroglobulin genes as follows: centromere--c-myc--J1--BL64--BL21--LY91--JBL2--+ ++LY66--thyroglobulin--telomere. This information is essential for further mapping of this important chromosomal region.
Abteilung Klinische Genetik, Universität Ulm, FRG.
S
S
Adolph
H
H
Hameister
B
B
Henglein
M
M
Lipp
P
P
Hartl
F
F
Baas
G
G
Lenoir
G W
GW
Bornkamm
D002051:Burkitt Lymphoma / Q000235:genetics*; D002874:Chromosome Mapping; D002889:Chromosomes, Human, Pair 2; D002898:Chromosomes, Human, Pair 8; D006801:Humans; D009693:Nucleic Acid Hybridization; D011519:Proto-Oncogenes; D014178:Translocation, Genetic