alexa Cloning and structural analysis of cDNAs for bcl-2 and a hybrid bcl-2 immunoglobulin transcript resulting from the t(14;18) translocation.


Hair Therapy & Transplantation

Author(s): Cleary ML, Smith SD, Sklar J

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Abstract cDNAs for the bcl-2 mRNA were cloned from a human common acute lymphoblastic leukemia cell line. Nucleotide sequence analyses showed that the 6 kb bcl-2 mRNA potentially encodes a 26 kd protein that is homologous to a predicted Epstein-Barr virus protein. Most t(14;18) translocation breakpoints cluster within a narrow region of a 5.4 kb exon that contains a long 3'-untranslated region of the bcl-2 mRNA. As a result of t(14;18) translocation, hybrid bcl-2/immunoglobulin heavy chain transcripts are produced that consist of the 5' half of the bcl-2 mRNA fused to a "decapitated" immunoglobulin heavy chain mRNA. Nucleotide sequence analyses confirmed that the hybrid transcripts continue to encode a normal bcl-2 protein. Our results suggest that t(14;18) translocations alter expression of the bcl-2 gene both by transcriptional activation and by abnormal posttranscriptional regulation of bcl-2 mRNA.
This article was published in Cell and referenced in Hair Therapy & Transplantation

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