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X-gp70: a third molecular species of the envelope protein gp70 of murine leukemia virus, expressed on mouse lymphoid
Abstract:
Three variants of the gp70 envelope component of MuLV are now recognizable serologically: GIX-gp70, 0-gp70, and X-gp70. The last of these, X-gp70, has so far been found only in mice or cells producing abundant C-type virus. This distinguishes X-gp70, provisionally, from the GIX-gp70 and 0-gp70 variants, each of which can be expressed on normal thymocytes without accompanying virus production, as exemplified by mouse strains 129 and B6, respectively. The X-gp70 genotype, however, is not limited to strains of mice-producing abundant virus, because X-gp70+ leukemias occur in strains of mice which do not produce a great deal of virus and whose thymocytes and other tissues are X-gp70-; this is analogous to the appearance of GIX+ leukemias in GIX- mouse strains.
Insights
Three variants of the MuLV envelope protein gp70 (GIX-gp70, 0-gp70, X-gp70) were identified. X-gp70 is associated with C-type virus production, unlike the others, but X-gp70+ leukemias can arise in low-virus-producing mice.
Area of Science:
- Virology
- Immunology
- Genetics
Background:
- Murine leukemia virus (MuLV) envelope protein gp70 exhibits distinct serological variants.
- These variants include GIX-gp70, 0-gp70, and X-gp70.
- Their expression patterns on mouse cells and association with viral activity are key differentiators.
Purpose of the Study:
- To serologically characterize and differentiate the three known variants of the MuLV gp70 envelope component.
- To investigate the association of X-gp70 with C-type virus production.
- To explore the occurrence of X-gp70 positive leukemias in mice with low viral output.
Main Methods:
- Serological identification of gp70 variants (GIX-gp70, 0-gp70, X-gp70).
- Analysis of gp70 expression on normal thymocytes and leukemic cells.
- Correlation of gp70 expression with C-type virus production in different mouse strains.
Main Results:
- X-gp70 is primarily found in mice or cells with abundant C-type virus production.
- GIX-gp70 and 0-gp70 can be expressed on normal thymocytes without virus production.
- X-gp70 positive leukemias were observed in mice that normally do not produce significant amounts of virus.
Conclusions:
- X-gp70's association with C-type virus production distinguishes it from GIX-gp70 and 0-gp70.
- The presence of X-gp70+ leukemias in low-virus-producing mice suggests complex viral-host interactions.
- These findings contribute to understanding MuLV envelope protein diversity and pathogenesis.