Abelson virus-induced lymphomagenesis in mice

Area of Science:

• Virology
• Immunogenetics
• Oncology

Background:

• Abelson murine leukemia virus (MuLV-A) is a known inducer of lymphomas in mice.
• Lymphomagenesis is influenced by various factors including age, virus dose, and host genetics.
• Existing knowledge of murine leukemia resistance genes (e.g., Fv-1, Fv-2) does not fully explain MuLV-A susceptibility.

Purpose of the Study:

• To investigate the genetic basis of Abelson virus (MuLV-A) induced lymphoma susceptibility in mice.
• To identify host genes controlling MuLV-A lymphoma induction.
• To understand the role of known and novel genetic loci in MuLV-A pathogenesis.

Main Methods:

• Testing lymphoma induction rates across 16 different mouse strains.
• Utilizing CXB recombinant inbred strains and their hybrids for genetic mapping.
• Performing virologic studies to analyze viral replication and genome interaction.

Main Results:

• Lymphoma induction by MuLV-A is age-dependent, virus dose-dependent, and controlled by host genes.
• BALB/c mice and some derivatives exhibit high sensitivity to MuLV-A.
• Two dominant sensitivity loci, tentatively named Av-1 and Av-2, were identified in BALB/c mice.
• The H-2 major histocompatibility complex may play a minor role in susceptibility.
• Resistance in adult B6 mice is specific to the defective transforming virus genome, not helper virus replication.

Conclusions:

• Host genes, particularly dominant alleles at Av-1 and Av-2, are critical determinants of MuLV-A lymphoma susceptibility.
• These susceptibility genes are distinct from previously characterized murine leukemia resistance genes.
• The findings provide a new framework for understanding the genetic control of retroviral lymphomagenesis.