A DNA element responsible for the different tissue specifities of Friend and Moloney retroviral enhancers

• Published in: Journal of virology Vol. 62; no. 2; pp. 614 - 618
• Main Authors: Thiesen, HJ, Boesze, Z, Henry, L, Charnay, P
• Format: Journal Article
• Language: English
• Published: 01-01-1988
• ISSN: 0022-538X

The transcriptional enhancers of the Moloney murine sarcoma virus (MuSV) and Moloney murine leukemia virus (MuLV) have different cell type specificities from that of the Friend MuLV. While the three enhancers are approximately equally active in erythroid cells, the Moloney MuSV and Moloney MuLV enhancers are 20- to 40-fold more active than the Friend MuLV enhancer in T-lymphoid cells. Using mutant enhancers, the authors have shown that specific differences between the nucleotide sequence of the Moloney MuSV and Friend MuLV enhancers are responsible for their different activities in T cells. Data allow the localization of a DNA element, repeated several times within the enhancer, which modulates the activity of the enhancer in T cells without affecting it in erythroid cells. This element therefore appears to be one of the determinants of the tissue specificity of the enhancer.