title: Characterization of a novel human endogenous retrovirus, HERV-H/F, expressed in human leukemia cell lines.
abstract: We have identified and characterized a human endogenous retrovirus (HERV) gag transcript in the human pre-B cell leukemia line Reh. The transcript was found to be a splice product of a structurally intact HERV element located on chromosome 6q13. Its primer binding site is complementary to phenylalanine (F) tRNA, common for the HERV-F family, but the overall genome sequence is closely related to the HERV-H family. The retroviral sequence was therefore designated HERV-H/F. The HERV element shows a distinct mRNA expression pattern among hematopoietic cancer cell lines with expression in some leukemia-derived cell lines of B-lymphoid and myeloid origin. No expression was observed in normal human tissues, indicating a cancer-specific expression pattern. The 5' long terminal repeat (LTR) was tested for promoter activity in HERV-H/F expressing and nonexpressing cell lines. The cell specificity of the LTR-mediated reporter gene expression did not conclusively correlate with endogenous virus expression, indicating that the transcription regulation of this gene is not alone dependent on cell-specific activity of transcription factors.
authors.affiliation: The Norwegian Radium Hospital, Department of Immunology, Montebello, N-0310, Oslo, Norway.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Patzke
authors.forename: Mats
authors.initials: M
authors.lastname: Lindeskog
authors.forename: Else
authors.initials: E
authors.lastname: Munthe
authors.forename: Hans Christian
authors.initials: HC
authors.lastname: Aasheim
mesh_terms: D001483:Base Sequence; D002460:Cell Line; D002896:Chromosomes, Human, Pair 6; D020077:Endogenous Retroviruses / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D015750:Genes, gag; D015751:Genes, pol; D006801:Humans; D008969:Molecular Sequence Data; D010802:Phylogeny; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000032:analysis; D016415:Sequence Alignment; D020079:Terminal Repeat Sequences; D014158:Transcription, Genetic
chemical_list: D012333:RNA, Messenger