Interpretation of genetic variants of uncertain significance in atypical hemolytic uremic syndrome.

Mutations in complement proteins predispose to atypical hemolytic uremic syndrome (aHUS). Mutation screening in aHUS is challenging, because most of the disease-associated mutations are individually rare, and a significant proportion of variants consist of missense mutations of unknown significance. The definitive interpretation of a variant of unknown significance (VUS) is often dependent on a reliable functional assay too time-consuming to be used in a diagnostic screening service. Allied research groups have analyzed these VUSs in aHUS.