For instance, research often favors populations with well-studied PD-associated mutations, as LRRK2 or GBA1 genes, which have been primarily investigated in individuals of European ancestry, leaving other groups underrepresented in genetic studies.20,21,22 Such gaps in representation fundamentally limit the generalizability of genetic findings and hinder the development of inclusive diagnostic and therapeutic frameworks. This evidence concerns the gene LRRK2 and Parkinson disease.