Key result
Transgenic HTLV-I tax gene in mice links to ~43% peak arthropathy prevalence driven by copy number.
Why the study?
The role of the HTLV-I tax gene in the development of arthropathy and bone remodeling was investigated due to observed high prevalence in transgenic mice.
HTLV-I tax-transgenic mice develop an inflammatory polyarthropathy resembling human seronegative arthritis, implicating the tax protein in HTLV-I-associated arthropathy.
Tax expression drives progressive arthropathy in mice; leaves open its role in HTLV-I joint disease and requires human validation.
Transgenic mice carrying the tax gene of human T-cell lymphotropic virus type I displayed a high prevalence of arthropathy. The percentage of affected animals increased with age, reaching a peak of 43% at 20 months. Southern analysis of deoxyribonucleic acid (DNA) from tissue samples indicated that disease development was related to tax copy number. Histopathologic evaluation of the ankle joints disclosed deep erosion of the synovial lining, fibrous tissue proliferation together with angiogenesis, mononuclear cell infiltration, and activation of osteoclasts. Radiologic examination confirmed joint involvement and revealed bone architecture modifications. The phenotype exhibited by the affected animals closely resembles that of seronegative arthritis in humans, and may indicate tax protein as a causal agent of arthropathy observed in HTLV-I infected individuals.
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Saggioro et al. (1997) studied Arthropathy. tax gene of human T-cell lymphotropic virus type I (HTLV-I) was evaluated on Arthropathy prevalence. Transgenic mice carrying the HTLV-I tax gene displayed a high prevalence of arthropathy, reaching a peak of 43% at 20 months of age, with disease development related to tax copy number.
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