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Differential susceptibility of mouse Lyt-2 and Lyt-3 genes to negative regulation.

Hybrids of Lyt-2/Lyt-3-positive class I-specific cytotoxic T lymphocytes (CTLs) with the BW5147 thymoma cell line (Lyt-2/Lyt-3-negative) are known to be Lyt-2/Lyt-3-negative due to shutoff of transcription of the CTL's Lyt-2 gene. Hybrids of a constitutively Lyt-2-positive transfectant of BW5147 (3B2) with a long term CTL line, 2C, and with CTLs generated in a mixed leucocyte reaction (MLR) shut off the CTL's Lyt-2 gene as expected but express the CTL's Lyt-3 gene product as a heterodimer with the product of the transfected Lyt-2 gene. Thus the Lyt-3 gene is not subject to the same negative regulatory influences as the Lyt-2 gene. That expression of Lyt-2 is not necessary for Lyt-3 gene transcription to continue is demonstrated by the finding that hybrids of MLR-generated CTLs with either BW5147 (Lyt-2-negative) or 3B2 (Lyt-2-positive) cells express Lyt-3 RNA. Southern hybridization and structural analysis of DNA fragments generated using the polymerase chain reaction demonstrated that hybrids contain several species of Lyt-3 RNA, one of which lacks the exon encoding the extracellular V-like domain and appears to be the product of an alternatively-spliced RNA transcript.[1]

References

  1. Differential susceptibility of mouse Lyt-2 and Lyt-3 genes to negative regulation. Hwang, I., Gu, J.J., Gottlieb, P.D. Immunogenetics (1993) [Pubmed]
 
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