GBA1 and Parkinson disease: Second, since mutations in the GCase GBA gene are associated with PD and seen more commonly in women with PD than men (Li et al., 2021), we explored whether LTCC support of DA release varied with GCase levels in females, by comparing mice that were heterozygous for the mouse Gba gene (Gba+/−) with wild‐type littermate homozygous controls (Gba+/+).