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For decades, Parkinson’s disease (PD) cases have been genetically categorised into familial, when caused by mutations in single genes with a clear inheritance pattern in affected families, or idiopathic, in the absence of an evident monogenic determinant. Recently, genome-wide association studies (GWAS) have revealed how common genetic variability can explain up to 36% of PD heritability and that PD manifestation is often determined by multiple variants at different genetic loci. Thus, one of the current challenges in PD research stands in modelling the complex genetic architecture of this condition and translating this into functional studies.  Caenorhabditis elegans  provide a profound advantage as a reductionist, economical model for PD research, with a short lifecycle, straightforward genome engineering and high conservation of PD relevant neural, cellular and molecular pathways. Functional models of PD genes utilising  C. elegans  show many phenotypes recapitulating pathologies observed in PD. When contrasted with mammalian  in vivo  and  in vitro  models, these are frequently validated, suggesting relevance of  C. elegans  in the development of novel PD functional models. This review will discuss how the nematode  C. elegans  PD models have contributed to the uncovering of molecular and cellular mechanisms of disease, with a focus on the genes most commonly found as causative in familial PD and risk factors in idiopathic PD. Specifically, we will examine the current knowledge on a central player in both familial and idiopathic PD,  Leucine-rich repeat kinase 2 (LRRK2)  and how it connects to multiple PD associated GWAS candidates and Mendelian disease-causing genes.

Modelling the functional genomics of Parkinson’s disease inCaenorhabditis elegans:LRRK2and beyond