Stop codon readthrough: molecular context for FeLV research
Viruses · 2026
In plain language
This review includes FeLV among the gammaretroviruses and describes how protein production continues beyond a stop signal in some viruses. It provides no direct experimental evidence in cats for the statements presented here. How much RNA structures contribute to the proposed mechanisms remains unclear. A substantial part of the article is also missing from the available material, so its full contents cannot be assessed.
Scientific detail
The review, published in Viruses in 2026, explicitly identifies FeLV as a representative gammaretrovirus. It also presents stop codon readthrough as a criterion for classifying post-transcriptional pol expression in gamma- and epsilon-retroviruses. The taxonomic identification of FeLV provides level D contextual support, not a direct experimental finding in cats. The review covers multiple species, and sample size is not reported.
Downstream RNA structures are associated with several proposed mechanisms: barriers to ribosome progression, ribosomal pausing, and interactions with trans-acting factors. These mechanisms are not mutually exclusive, and their relative contributions remain unresolved. The author notes that only six viral species have been intensively investigated and that the mechanistic basis of the interactions governing stop codon readthrough remains incompletely understood. The review does not establish a single confirmed mechanism for FeLV.
The supplied material omits a substantial portion of the article, preventing assessment of experimental details and any FeLV-specific discussion in that portion. The review provides mechanistic context for FeLV research, but applying the reported MoMLV mutation outcomes or detailed RNA-structure mechanisms to FeLV would be an inference, not direct feline evidence.
What we know
The review explicitly identifies FeLV as a representative gammaretrovirus; this statement has level D contextual support, not direct experimental evidence in cats. It identifies stop codon readthrough as a criterion for classifying post-transcriptional pol expression in gamma- and epsilon-retroviruses. The proposed mechanisms involving downstream RNA structures are not mutually exclusive.
What we don't know
The relative contributions of RNA structures to barriers to ribosome progression, ribosomal pausing, and interactions with trans-acting factors remain unresolved. The mechanistic basis of the interactions governing stop codon readthrough is still incompletely understood, and only six viral species have been intensively investigated. No single confirmed mechanism for FeLV or direct feline evidence supporting extrapolation of the MoMLV findings is established. The omitted portion of the article prevents assessment of its experimental details and any FeLV discussion it contains.
Evidence
EvidenceLevel D — Indirect evidence: other species or retrovirusConfidence 100/100
The review identifies FeLV as a representative gammaretrovirus.
Excerpt verified in the source — verbatim, in the source's own language“Representative gammaretroviruses include oncogenic murine leukemia viruses, feline leukemia virus (FeLV), gibbon ape leukemia virus (GaLV), Koala retrovirus (KoRV), and avian reticuloendotheliosis virus (REV) ( Table 2 ).”
This is an explicit taxonomic statement in Section 2.2, not a direct experimental finding in cats. Level D denotes the review's contextual support rather than feline experimental evidence.
Open questionConfidence 100/100
The relative contributions of downstream RNA structures to ribosome progression barriers, ribosomal pausing, and interactions with trans-acting factors remain unresolved.
Section 4.5 explicitly states that these proposed mechanisms are not mutually exclusive and that their relative contributions remain unclear. It does not establish a single confirmed mechanism for FeLV.
Provenance
Source: RNA <i>Cis</i>-Elements Involved in Animal Virus Stop Codon Readthrough: Stop Codon Context and Downstream RNA Structures.
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