The function of ENSG00000154237 (LRRK1, leucine rich repeat kinase 1) is as follows. Serine/threonine-protein kinase which phosphorylates RAB proteins involved in intracellular trafficking (PubMed:36040231). Phosphorylates RAB7A; this activity is dependent on protein kinase C (PKC) activation (PubMed:36040231, PubMed:37558661, PubMed:37857821). Plays a role in the negative regulation of bone mass, acting through the maturation of osteoclasts (By similarity). {ECO:0000250|UniProtKB:Q3UHC2, ECO:0000269|PubMed:36040231, ECO:0000269|PubMed:37558661, ECO:0000269|PubMed:37857821}.