UCHL1 and Parkinson disease: However, the MLPA analysis included probes for several additional genes associated with PD, including ATPase 13A2 (ATP13A2), Leucine-rich repeat kinase 2 (LRRK2), GTP Cyclohydrolase 1 (GCH1) and Ubiquitin C-terminal hydrolase L1 (UCHL1).