Tissue specific LRRK2 interactomes reveal a distinct striatal functional unit

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Mutations in Leucine-Rich Repeat Kinase 2 (LRRK2) represent the most frequent genetic cause of Parkinson's disease.
• The precise physiological and pathological functions of LRRK2 remain incompletely understood despite extensive research.

Purpose of the Study:

• To systematically construct the general protein-protein interactome of LRRK2.
• To analyze the expression patterns and co-expression behaviors of LRRK2 interactors across 15 healthy human tissues.
• To generate tissue-specific LRRK2 interactomes and explore their functional implications.

Main Methods:

• Systematic construction of the LRRK2 protein-protein interactome.
• Evaluation of interactors based on differential gene expression and co-expression patterns in 15 tissue types.
• Generation and analysis of tissue-specific LRRK2 interactomes, focusing on striatal and cerebellar comparisons.

Main Results:

• LRRK2 interactors display distinct expression profiles in the brain compared to peripheral tissues.
• A significant similarity in LRRK2 interactors was identified within the striatum (putamen, caudate, nucleus accumbens), suggesting a functional cluster.
• Tissue-specific interactomes were generated, enabling exploration of LRRK2 functions in different cellular contexts, including its relationship with Rab proteins.

Conclusions:

• The LRRK2 interactome, combined with tissue-specific expression data, provides a valuable resource for understanding LRRK2's role in health and disease.
• The identified striatal functional cluster offers new insights into LRRK2's specific involvement in brain regions affected by Parkinson's disease.
• This approach facilitates the investigation of LRRK2's interactions with specific protein families, such as Rab proteins, across various tissues.