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Chromosomal translocations in Burkitt lymphoma and mouse plasmacytomas typically lie within or near the protooncogene MYC. In some instances, however, these tumors contain variant translocations with breakpoints located more distant from and downstream of MYC, in a domain commonly known as pvt-1. Until now, there has been no evidence that pvt-1 marks the location of a functional gene. Here we report the identification of a large transcriptional unit in human DNA that includes pvt-1. We have designated this unit as PVT. PVT begins 57 kilobase pairs downstream of MYC and occupies a minimum of 200 kilobase pairs of DNA. Some of the translocations that occur downstream of MYC in Burkitt lymphoma transect PVT; others lie between the two genes. None of the translocations we have studied appear to enhance transcription from an intact allele of PVT (indeed, they may inactivate that transcription), but some are associated with the production of abundant and anomalous 0.8- to 1.0-kilobase RNAs that contain the 5' exon of PVT and sequences transcribed from the constant region of an immunoglobulin gene (the reciprocal participant in the translocation). Identification of PVT should facilitate the exploration of how translocations downstream of MYC and insertions of retroviral DNA in the vicinity of pvt-1 might contribute to tumorigenesis.

Identification of a human transcription unit affected by the variant chromosomal translocations 2;8 and 8;22 of Burkitt lymphoma.