ArticlePLoS computational biology2025
Evolutionary divergence of induced versus constitutive antiviral gene expression levels between primates and rodents.
Article in PLoS computational biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Hundreds of genes are upregulated in response to pathogen infection. These genes' sequences often diverge across mammals, to counteract rapid pathogen evolution. However, the transcriptional divergence of these genes, their relative levels before and after infection in different host species, remains poorly understood. We studied this divergence by comparing gene expression before and after viral stimulation in cells from primates and rodents. We developed a method to identify orthologs strongly upregulated in one species that are unchanged in response to stimulus in another species. Using human and mouse data, we detected 578 transcriptionally divergent orthologous genes. For example, genes related to the NFκB complex are only upregulated in mouse. While most divergent genes do not belong to the same cellular process, several pathways and protein complexes are enriched in this set, suggesting that divergence in immune responses between closely related mammals is limited to specific modules rather than involving entire pathways. Transcriptional divergence between human and mouse orthologs was also observed when ortholog expression from different primates and rodents were compared, when responses were studied in several other cell types, and was recapitulated at the chromatin level, using histone mark patterns that denote active promoter regions. Surprisingly, these transcriptional changes were associated with evolutionary changes in coding sequences only when the genes are lowly expressed. In summary, we found genes whose orthologs diverge between primates and rodents in response to immune stimulation. Some of these genes are constitutively expressed in one species even before infection, potentially facilitating rapid antiviral activity that may be linked to clade-specific adaptation to confer greater resistance against pathogens. Further studies are required to test which of these transcriptional changes are adaptive, and what are their functional consequences. Moreover, comparative studies on diverse infections can point to additional species-specific responses and how they enable different species to overcome infection.
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