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• W4248586907 abstract "Abstract Previously we had characterized the t(1;7)(p34;q34) translocation from HSB-2. This translocation fused the beta T-cell receptor gene (TCRB) constant region and transcriptional enhancer with the type I transcription unit of the LCK gene on the derivative 1 [der(1)] chromosome. The type II promoter was translocated to the der(7) chromosome. Regarding the mechanism of the t(1;7) in HSB-2, we identified an alternating purine-pyrimidine tract (G-T)17 at the 1p34/LCK breakpoint. Additionally, sequence analysis of both breakpoint junctions provided data that implicate the V(D)J recombinase in formation of the t(1;7). A heptamer-nonamer recognition sequence with a 12-bp spacer was found in the immediate vicinity of the 1p34/LCK breakpoint and, thus, chromosomal breakage at 1p34 may be explained as resulting from recombinase activity. Because phosphorylation of Tyr-505 in vivo regulates the tyrosine kinase activity of p56lck we amplified a region from LCK exon 12 that contains the codon for Tyr-505 and showed no mutation of this codon in HSB-2 DNA and, therefore, p56lck in HSB-2 is not activated by mutation of Tyr-505. We have analyzed LCK gene expression in HSB-2 and SUP-T12 cell lines. RNase protection analysis identified almost exclusively type I transcripts in HSB-2. An independent t(1;7) in SUP-T12 also resulted in the juxtaposition of LCK to TCRB. The breakpoint in SUP-T12 occurred 2 kb 5′ of the type II promoter, leaving an intact LCK gene on the der(1) chromosome. RNase protection analysis identified both type I and type II LCK transcripts in a 3:1 ratio in SUP-T12. Factors other than proximity to the TCRB enhancer must affect promoter utilization in this cell line." @default.
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• W4248586907 date "1994-08-15" @default.
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• W4248586907 title "Molecular analysis of the T-cell acute lymphoblastic leukemia- associated t(1;7)(p34;q34) that fuses LCK and TCRB" @default.
• W4248586907 doi "https://doi.org/10.1182/blood.v84.4.1232.1232" @default.
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