1. Biallelic mutations in SNX14 cause a syndromic form of cerebellar atrophy and lysosome-autophagosome dysfunction
- Author
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Keith K. Vaux, Mahmut Şamil Sağıroğlu, Laila Bastaki, Seth J. Field, Pascale de Lonlay, Sawsan Abdel-Hadi, Lihadh Al-Gazali, Hülya Kayserili, Ali Dursun, Jeffrey D. Esko, Eric Scott, Xin Wang, Faezeh Mojahedi, Ashleigh E. Schaffer, R. Köksal Özgül, Iman G. Mahmoud, Isabelle Desguerre, Matthew D. Buschman, Laila Selim, Samia A. Temtamy, Jean-Laurent Casanova, Murat Gunel, Abdelrahim Abdrabou Sadek, Philip L.S.M. Gordts, Brett Copeland, Mona Aglan, Amira Masri, Maha S. Zaki, Joseph G. Gleeson, Matloob Azam, Naiara Akizu, Vincent Cantagrel, Antoinette Gelot, Basak Rosti, Jennifer L. Silhavy, Esra Dikoglu, Ulrich Müller, Amera El Badawy, Gennaro Napolitano, Stacey Gabriel, Rasim Ozgur Rosti, Jana Schroth, Samira Ismail, Ghada M H Abdel-Salam, İç Hastalıkları, Akizu, Naiara, Cantagrel, Vincent, Zaki, Maha S., Al-Gazali, Lihadh, Wang, Xin, Rosti, Rasim Ozgur, Dikoglu, Esra, Gelot, Antoinette Bernabe, Rosti, Basak, Vaux, Keith K., Scott, Eric M., Silhavy, Jennifer L., Schroth, Jana, Copeland, Brett, Schaffer, Ashleigh E., Gordts, Philip L. S. M., Esko, Jeffrey D., Buschman, Matthew D., Field, Seth J., Napolitano, Gennaro, Abdel-Salam, Ghada M., Ozgul, R Koksal, Saglroglu, Mahmut Samil, Azam, Matloob, Ismail, Samira, Aglan, Mona, Selim, Laila, Mahmoud, Iman G., Abdel-Hadi, Sawsan, Badawy, Amera El, Sadek, Abdelrahim A., Mojahedi, Faezeh, Kayserili, Hulya, Masri, Amira, Bastaki, Laila, Temtamy, Samia, Müller, Ulrich, Desguerre, Isabelle, Casanova, Jean-Laurent, Dursun, Ali, Gunel, Murat, Gabriel, Stacey B., De Lonlay, Pascale, and Gleeson, Joseph G.
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Male ,Autophagosome ,medicine.disease_cause ,Medical and Health Sciences ,Lysosomal Storage Disease ,Gene Frequency ,Cerebellum ,Phagosomes ,Child ,Sorting Nexins ,Phagosome ,Zebrafish ,2. Zero hunger ,Genetics ,Mutation ,Cerebellar Disease ,Syndrome ,Biological Sciences ,Lysosome ,Cell biology ,medicine.anatomical_structure ,Child, Preschool ,Female ,Cerebellar atrophy ,medicine.symptom ,Human ,Ataxia ,Endosome ,Biology ,Article ,Cerebellar Diseases ,Clinical Research ,Autophagy ,medicine ,Animals ,Humans ,Spinocerebellar Ataxias ,Preschool ,Spinocerebellar Ataxia ,Animal ,Sorting Nexin ,Infant ,Brain Disorders ,Lysosomal Storage Diseases ,Sorting nexin ,Atrophy ,Lod Score ,Lysosomes ,Developmental Biology - Abstract
Pediatric-onset ataxias often present clinically as developmental delay and intellectual disability, with prominent cerebellar atrophy as a key neuroradiographic finding. Here we describe a new clinically distinguishable recessive syndrome in 12 families with cerebellar atrophy together with ataxia, coarsened facial features and intellectual disability, due to truncating mutations in the sorting nexin gene SNX14, encoding a ubiquitously expressed modular PX domain-containing sorting factor. We found SNX14 localized to lysosomes and associated with phosphatidylinositol (3,5)-bisphosphate, a key component of late endosomes/lysosomes. Patient-derived cells showed engorged lysosomes and a slower autophagosome clearance rate upon autophagy induction by starvation. Zebrafish morphants for snx14 showed dramatic loss of cerebellar parenchyma, accumulation of autophagosomes and activation of apoptosis. Our results characterize a unique ataxia syndrome due to biallelic SNX14 mutations leading to lysosome-autophagosome dysfunction.
- Published
- 2015
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