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Mutation in the SYNJ1 Gene Associated with Autosomal Recessive, Early-Onset Parkinsonism

Quadri, Marialuisa, Fang, Mingyan, Picillo, Marina, Olgiati, Simone, Breedveld, Guido J., Graafland, Josja, Wu, Bin, Xu, Fengping, Erro, Roberto, Amboni, Marianna, Pappatà, Sabina, Quarantelli, Mario, Annesi, Grazia, Quattrone, Aldo, Chien, Hsin F., Barbosa, Egberto R., The International Parkinsonism Genetics Network, Oostra, Ben A., Barone, Paolo, Wang, Jun, Bonifati, Vincenzo·2013·Human Mutation

Abstract

Autosomal recessive, early-onset Parkinsonism is clinically and genetically heterogeneous. Here, we report the identification, by homozygosity mapping and exome sequencing, of a SYNJ1 homozygous mutation (p.Arg258Gln) segregating with disease in an Italian consanguineous family with Parkinsonism, dystonia, and cognitive deterioration. Response to levodopa was poor, and limited by side effects. Neuroimaging revealed brain atrophy, nigrostriatal dopaminergic defects, and cerebral hypometabolism. SYNJ1 encodes synaptojanin 1, a phosphoinositide phosphatase protein with essential roles in the postendocytic recycling of synaptic vesicles. The mutation is absent in variation databases and in ethnically matched controls, is damaging according to all prediction programs, and replaces an amino acid that is extremely conserved in the synaptojanin 1 homologues and in SAC1-like domains of other proteins. Sequencing the SYNJ1 ORF in unrelated patients revealed another heterozygous mutation (p.Ser1422Arg), predicted as damaging, in a patient who also carries a heterozygous PINK1 truncating mutation. The SYNJ1 gene is a compelling candidate for Parkinsonism; mutations in the functionally linked protein auxilin cause a similar early-onset phenotype, and other findings implicate endosomal dysfunctions in the pathogenesis. Our data delineate a novel form of human Mendelian Parkinsonism, and provide further evidence for abnormal synaptic vesicle recycling as a central theme in the pathogenesis.

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Metadata

Authors
Quadri, M., Fang, M., Picillo, M., Olgiati, S., Breedveld, G. J., Graafland, J., Wu, B., Xu, F., Erro, R., Amboni, M., Pappatà, S., Quarantelli, M., Annesi, G., Quattrone, A., Chien, H. F., Barbosa, E. R., The International Parkinsonism Genetics Network, Oostra, B. A., Barone, P., Wang, J., & Bonifati, V.
Venue
Human Mutation
Publisher
Wiley
Published
2013-08-06
Volume
34
Issue
9
Pages
1208-1215
ISSN
1059-7794 (ISSN-L)
OpenAlex
W2092101573
Cited by
320
References
34
FWCI
14.25
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Mutation in the SYNJ1 Gene Associated with Autosomal Recessive, Early-Onset Parkinsonism. https://app.cochat.ai/papers/10.1002/humu.22373
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Quadri, M., Fang, M., Picillo, M., Olgiati, S., Breedveld, G. J., Graafland, J., Wu, B., Xu, F., Erro, R., Amboni, M., Pappatà, S., Quarantelli, M., Annesi, G., Quattrone, A., Chien, H. F., Barbosa, E. R., The International Parkinsonism Genetics Network, Oostra, B. A., Barone, P., . . . Bonifati, V. (2013). Mutation in the SYNJ1 Gene Associated with Autosomal Recessive, Early-Onset Parkinsonism. Human Mutation. https://doi.org/10.1002/humu.22373

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