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Kidney involvement is frequently underappreciated and has been dismissed as a functional consequence of heart failure. Amyloidosis chapters and reviews in kidney journals do not mention wtATTR or kidney involvement in wtATTR and clinical trials do not report chronic kidney disease (CKD) as a relevant comorbidity. However, kidney papillary wtATTR deposits have been described. Recent large series of ATTR cardiac amyloidosis, mostly representing wtATTR, report estimated glomerular filtration rate and albuminuria values consistent with CKD G3\u2013G5 in\u00a0&amp;gt;50% and with CKD G1\u2013G5 in 70% of participants, making CKD the most common feature after heart disease. Both low glomerular filtration rate (GFR) and high albuminuria are key markers of amyloid disease progression in ATTR amyloidosis. Furthermore, GFR and N-terminal pro-B-type natriuretic peptide (a parameter responsive to GFR) are the two components of National Amyloidosis Centre stages used for inclusion and risk stratification in ATTR clinical trials. However, the interaction between kidneys, kidney disease, and ATTR amyloidosis remains underexplored. Specifically, kidney-related pro-amyloidogenic events may include proteins destabilization by high urea concentration and low pH in the renal papilla, CKD-associated reduced clearance of ATTR monomers (estimated glomerular sieving coefficient 0.84), and post-translational protein modifications of monomers (e.g. lysine carbamylation by urea) driven by longer half-life and higher concentrations of uremic retention solutes in CKD. In summary, kidney involvement in wtATTR is more common than previously appreciated and predicts outcomes. Research is needed into potential bidirectional relationships between age-associated kidney dysfunction and age-associated wtATTR.<\/jats:p>","DOI":"10.1093\/ndt\/gfag118","type":"journal-article","created":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T11:46:01Z","timestamp":1779277561000},"source":"Crossref","is-referenced-by-count":1,"title":["ATTR: the forgotten kidney amyloidosis"],"prefix":"10.1093","author":[{"given":"Barbara","family":"Soler","sequence":"first","affiliation":[{"name":"Department of Internal Medicine, FIIB, Hospital Universitario Infanta Leonor , Madrid ,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daria","family":"Abasheva","sequence":"additional","affiliation":[{"name":"Department of Nephrology and Hypertension, IIS-Fundacion Jimenez Diaz UAM , Madrid ,","place":["Spain"]},{"name":"RICORS2040 , Madrid 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