#422 Evolutionary roots of renal tubulopathies: integrating Homer Smith's hypothesis with novel phylogenomic methodologies

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Abstract Background and Aims In his landmark 1953 publication, From Fish to Philosopher, physiologist Homer Smith presented the evolutionary history of renal function as a source of insights for medicine. Seven decades later, it is increasingly clear that the evolutionary story underlying the emergence of renal physiology can provide novel insights into the causes of and potential treatments for renal pathologies. Why are humans vulnerable to renal tubulopathies (RT)? Shouldn't natural selection have favored phenotypes resistant to illness? The evolutionary story of this susceptibility can provide novel insights with salience for research and clinical practice. Importantly, not all traits are adaptive. While natural selection produces adaptive phenotypes, evolutionary trade-offs may lead to both non-adaptive and adaptive characteristics. Emerging phylogenomic methods can help identify potential selective pressures shaping the evolutionary emergence of specific disease vulnerabilities. Here, a novel methodology is used to uncover the origins of RT vulnerability from the dawn of cellular life to modern human kidney. Method This methodology analyses RT gene sets to identify the biologically beneficial processes underlying vulnerability to disease. Gene curation from DisGeNET (v7.0) and MalaCards (v1.14) identified genes for seven RT chosen for their well-characterized genetic bases and relevance to human renal physiology: Fanconi, Bartter, Gitelman, Liddle, Gordon, Distal Renal Tubular Acidosis, and Nephrogenic Diabetes Insipidus. Phylostratigraphic analysis (PhyloFastStrat, v0.2.2) was performed to map the genes’ emergence and adaptations, tracing their origins from cellular life (∼3.6 billion years ago) to Homo sapiens. Gene enrichment analysis (GOEnrichr v3.0) was performed on each set of genes to elucidate their biological, molecular, and cellular roles in renal physiology. Results While analyses encompassed seven RT, evolutionary histories underlying only two, Fanconi and Gitelman, are featured in this abstract. Fanconi syndrome (63 genes) exhibits a distinctive evolutionary trajectory, with early emergence during the cellular organism stage, highlighting the foundational role in solute transport, metabolic homeostasis and waste excretion. As life transitioned to multicellularity, additional genes emerged, particularly during the metazoan stage (∼770 MYA), enabling tissue-specific solute transport. A notable peak in Mammalia (∼220 MYA) reflects functional diversification to terrestrial life adaptations, followed by core gene conservation (Fig. 1). Gitelman syndrome (34 genes) also shows ancient origins, with high initial genes emergence at the cellular organism stage. Key innovations occurred in jawed vertebrates (∼420 MYA), with the development of complex ion transport systems, land-dwelling tetrapods (∼370 MYA), refining mechanisms for electrolyte and water conservation on dry land, and mammals (∼125 MYA), specializing the distal nephron to meet metabolic demands of warm-blooded physiology. A minor uptick in Homo sapiens suggests slight genetic fine-tuning in renal electrolyte handling, potentially reflecting unique human dietary or environmental adaptations (Fig. 2). Conclusion This study highlights the evolutionary trajectory of genes implicated in RT suggesting that vulnerability emerged as an evolutionary trade-off for positive selection for biological processes critical to tubular function. RT vulnerability was linked to several evolutionary milestones including the emergence of ion transport systems, terrestrial adaptations, and tubule refinement. The ancient origins of tubular pathology offer a novel framework for a strengthened understanding of the triggers and natural history of these often enigmatic disorders. This finding is aligned with the prescient premise of Homer Smith's 1953 publication.

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