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A deleterious mutation in DNAJC6 encoding the neuronal-specific clathrin-uncoating co-chaperone auxilin, is associated with juvenile parkinsonism.

PloS one | May 7, 2012

Parkinson disease is caused by neuronal loss in the substantia nigra which manifests by abnormality of movement, muscle tone, and postural stability. Several genes have been implicated in the pathogenesis of Parkinson disease, but the underlying molecular basis is still unknown for ∼70% of the patients. Using homozygosity mapping and whole exome sequencing we identified a deleterious mutation in DNAJC6 in two patients with juvenile parkinsonism. The mutation was associated with abnormal transcripts and marked reduced DNAJC6 mRNA level. DNAJC6 encodes the HSP40 Auxilin, a protein which is selectively expressed in neurons and confers specificity to the ATPase activity of its partner Hcs70 in clathrin uncoating. In Auxilin null mice it was previously shown that the abnormally increased retention of assembled clathrin on vesicles and in empty cages leads to impaired synaptic vesicle recycling and perturbed clathrin mediated endocytosis. Endocytosis function, studied by transferring uptake, was normal in fibroblasts from our patients, likely because of the presence of another J-domain containing partner which co-chaperones Hsc70-mediated uncoating activity in non-neuronal cells. The present report underscores the importance of the endocytic/lysosomal pathway in the pathogenesis of Parkinson disease and other forms of parkinsonism.

Pubmed ID: 22563501 RIS Download

Mesh terms: Adolescent | Auxilins | Base Sequence | Clathrin | DNA Mutational Analysis | Family Health | HSP40 Heat-Shock Proteins | Humans | Male | Molecular Chaperones | Mutation | Neurons | Parkinsonian Disorders | Pedigree

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OMIM

Collection of human genes and genetic phenotypes, focusing on the relationship between phenotype and genotype. The full-text, referenced overviews in OMIM contain information on all known mendelian disorders and a variety of related genes. It is updated daily, and the entries contain copious links to other genetics resources.

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MutationTaster

Evaluates disease-causing potential of sequence alterations.

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SIFT

Data analysis service to predict whether an amino acid substitution affects protein function based on sequence homology and the physical properties of amino acids. SIFT can be applied to naturally occurring nonsynonymous polymorphisms and laboratory-induced missense mutations. (entry from Genetic Analysis Software) Web service is also available.

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