Large-scale functional assessment of variants of the potassium channel Kir2.1: Clinical and comparative insights.

ABSTRACT: Hundreds of KCNJ2 (Kir2.1) variants of uncertain significance (VUS) have been associated with Andersen-Tawil Syndrome (ATS). Remarkably, most Kir2.1 variants' surface expression and function have been described via deep mutational scans (DMS). These results have provided an unprecedented picture of Kir2.1 structure-function relationships and insights into VUS. However, these studies are limited by the lack of robust validation. We performed a flow cytometry-based Kir2.1 surface expression assay for 70 variants (61 ATS-linked) distributed across the potassium inward rectifier channel, a thermal stability assay of 20 variants with reduced surface expression, a yeast-based functional assay for 20 variants (10 pathogenic or likely pathogenic (P/LP) and 10 VUS), as well as whole-cell patch clam

SUBMITTER: Anderson CL 

PROVIDER: S-EPMC12775956 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature