Abstract: The present invention refers to a newly discovered gene named KASPP for Kinase Associated with Parkinsonism with Pleiomorphic Pathology or alternatively named LRRK2 for Leucine-Rich Repeat Kinase 2, its production, biochemical characterization and use for the detection and treatment of neurodegenerative disorders, such as Parkinson disease (PD) including, without limitation, sporadic PD, Alzheimer disease (AD), amyotrophic lateral sclerosis (ALS), and other synucleinopathies and/or tauopathy as well as several polymorphisms and mutations in the KASPP/LRRK2 gene segregated with PD.

Abstract: The present invention relates to an affinity marker comprising a FLAG-domain, which contains at least one FLAG-tag, and a Streptavidin-binding domain (Strep-domain), which contains at least two Strep-tags, a protein containing this affinity marker, a nucleic acid which codes for it, a vector or a cell containing the affinity marker, method for the purification of a protein produced in a cell using this affinity marker, and the use of the affinity marker for the purification of a protein produced in a cell.