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Cant\u00fa syndrome (CS) is a rare disease caused by mutations in the genes encoding Kir6.1 (KCNJ8) and SUR2A (ABCC9) that produce KATP channel hyperactivity due to a reduced channel block by physiological ATP concentrations. We functionally characterized the p.S1054Y SUR2A mutation identified in two CS carriers, who exhibited a mild phenotype although the mutation was predicted as highly pathogenic. We recorded macroscopic and single-channel currents in CHO and HEK-293 cells and measured the membrane expression of the channel subunits by biotinylation assays in HEK-293 cells. The mutation increased basal whole-cell current density and at the single-channel level, it augmented opening frequency, slope conductance, and open probability (Po), and promoted the appearance of multiple conductance levels. p.S1054Y also reduced Kir6.2 and SUR2A expression specifically at the membrane. Overexpression of ankyrin B (AnkB) prevented these gain- and loss-of-function effects, as well as the p.S1054Y-induced reduction of ATP inhibition of currents measured in inside-out macropatches. Yeast two-hybrid assays suggested that SUR2A WT and AnkB interact, while p.S1054Y interaction with AnkB is decreased. The p.E322K Kir6.2 mutation, which prevents AnkB binding to Kir6.2, produced similar biophysical alterations than p.S1054Y. Our results are the first demonstration of a CS mutation whose functional consequences involve the disruption of AnkB effects on KATP channels providing a novel mechanism by which CS mutations can reduce ATP block. Furthermore, they may help explain the mild phenotype associated with this mutation.<\/jats:p>","DOI":"10.1085\/jgp.202112995","type":"journal-article","created":{"date-parts":[[2022,10,26]],"date-time":"2022-10-26T14:24:08Z","timestamp":1666794248000},"update-policy":"https:\/\/doi.org\/10.1085\/jgp.crossmarkpolicy","source":"Crossref","is-referenced-by-count":5,"title":["A Cant\u00fa syndrome mutation produces dual effects on KATP channels by disrupting ankyrin B regulation"],"prefix":"10.1085","volume":"155","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3635-1446","authenticated-orcid":true,"given":"Teresa","family":"Crespo-Garc\u00eda","sequence":"first","affiliation":[{"name":"Department of Pharmacology and Toxicology, School of Medicine, Universidad Complutense de Madrid, Instituto de Investigaci\u00f3n Gregorio Mara\u00f1\u00f3n 1 , Madrid, Spain"},{"name":"Centro de Investigaci\u00f3n Biom\u00e9dica en Red Enfermedades Cardiovasculares 2 , Madrid, 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