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Relationship in nucleic acid sequences between mouse mammary tumor virus variants
Summary
Mouse mammary tumor virus (MMTV) RNAs from different mouse strains are genetically identical. However, milk-transmitted MMTV(C3H) and vertically transmitted MMTV(C3Hf) show only 75% genomic similarity.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Mouse mammary tumor virus (MMTV) is a retrovirus associated with mammary cancer in mice.
- Understanding MMTV genetic diversity is crucial for studying viral pathogenesis and transmission.
Purpose of the Study:
- To compare the genetic sequences of MMTV isolates from different mouse strains.
- To determine the genomic similarity between milk-transmitted and vertically transmitted MMTV.
Main Methods:
- Primary cultures of mouse mammary carcinomas were used to isolate MMTV RNA.
- Competition molecular hybridization experiments were performed to assess RNA sequence homology.
Main Results:
- MMTV RNAs from RIII, GR, A, and C3H mouse strains were found to be identical.
- MMTV(C3H) and MMTV(C3Hf) exhibited approximately 75% genomic similarity.
- No sequence homology was detected between MMTV(C3H) RNA and RNAs from murine leukemia virus, Mason-Pfizer virus, or guinea pig virus.
Conclusions:
- MMTV isolates from various mouse strains share highly conserved genetic sequences.
- Distinct transmission routes (milk vs. vertical) correlate with partial genomic divergence in MMTV.
- MMTV is genetically distinct from other tested murine and guinea pig retroviruses.