Defects in autophagosome-lysosome fusion underlie Vici syndrome, a neurodevelopmental disorder with multisystem involvement
Abstract Vici syndrome (VICIS) is a rare, autosomal recessive neurodevelopmental disorder with multisystem involvement characterized by agenesis of the corpus callosum, cataracts, cardiomyopathy, combined immunodeficiency, developmental delay, and hypopigmentation. Mutations in EPG5, a gene that enc...
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Nature Portfolio
2017
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oai:doaj.org-article:abd2bb894e10470690aae074befb794d2021-12-02T15:05:31ZDefects in autophagosome-lysosome fusion underlie Vici syndrome, a neurodevelopmental disorder with multisystem involvement10.1038/s41598-017-02840-82045-2322https://doaj.org/article/abd2bb894e10470690aae074befb794d2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02840-8https://doaj.org/toc/2045-2322Abstract Vici syndrome (VICIS) is a rare, autosomal recessive neurodevelopmental disorder with multisystem involvement characterized by agenesis of the corpus callosum, cataracts, cardiomyopathy, combined immunodeficiency, developmental delay, and hypopigmentation. Mutations in EPG5, a gene that encodes a key autophagy regulator, have been shown to cause VICIS, however, the precise pathomechanism underlying VICIS is yet to be clarified. Here, we describe detailed clinical (including brain MRI and muscle biopsy) and genetic features of nine Japanese patients with VICIS. Genetic dissection of these nine patients from seven families identified 14 causative mutations in EPG5. These included five nonsense, two frameshift, three splicing, one missense, and one multi-exon deletion mutations, and two initiation codon variants. Furthermore, cultured skin fibroblasts (SFs) from two affected patients demonstrated partial autophagic dysfunction. To investigate the function of EPG5, siRNA based EPG5 knock-down, and CRISPR/Cas9 mediated EPG5 knock-out HeLa cells were generated. EPG5-depleted cells exhibited a complete block of autophagic flux caused by defective autophagosome-lysosome fusion. Unexpectedly, endocytic degradation was normal in both VICIS SFs and EPG5 depleted cells, suggesting that EPG5 function is limited to the regulation of autophagosome-lysosome fusion.Ikumi HoriTakanobu OtomoMitsuko NakashimaFuyuki MiyaYutaka NegishiHideaki ShiraishiYutaka NonodaShinichi MagaraJun TohyamaNobuhiko OkamotoTakeshi KumagaiKonomi ShimodaYoshiya YukitakeDaigo KajikawaTomohiro MorioAyako HattoriMotoo NakagawaNaoki AndoIchizo NishinoMitsuhiro KatoTatsuhiko TsunodaHirotomo SaitsuYonehiro KanemuraMami YamasakiKenjiro KosakiNaomichi MatsumotoTamotsu YoshimoriShinji SaitohNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017) |
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Medicine R Science Q Ikumi Hori Takanobu Otomo Mitsuko Nakashima Fuyuki Miya Yutaka Negishi Hideaki Shiraishi Yutaka Nonoda Shinichi Magara Jun Tohyama Nobuhiko Okamoto Takeshi Kumagai Konomi Shimoda Yoshiya Yukitake Daigo Kajikawa Tomohiro Morio Ayako Hattori Motoo Nakagawa Naoki Ando Ichizo Nishino Mitsuhiro Kato Tatsuhiko Tsunoda Hirotomo Saitsu Yonehiro Kanemura Mami Yamasaki Kenjiro Kosaki Naomichi Matsumoto Tamotsu Yoshimori Shinji Saitoh Defects in autophagosome-lysosome fusion underlie Vici syndrome, a neurodevelopmental disorder with multisystem involvement |
| description |
Abstract Vici syndrome (VICIS) is a rare, autosomal recessive neurodevelopmental disorder with multisystem involvement characterized by agenesis of the corpus callosum, cataracts, cardiomyopathy, combined immunodeficiency, developmental delay, and hypopigmentation. Mutations in EPG5, a gene that encodes a key autophagy regulator, have been shown to cause VICIS, however, the precise pathomechanism underlying VICIS is yet to be clarified. Here, we describe detailed clinical (including brain MRI and muscle biopsy) and genetic features of nine Japanese patients with VICIS. Genetic dissection of these nine patients from seven families identified 14 causative mutations in EPG5. These included five nonsense, two frameshift, three splicing, one missense, and one multi-exon deletion mutations, and two initiation codon variants. Furthermore, cultured skin fibroblasts (SFs) from two affected patients demonstrated partial autophagic dysfunction. To investigate the function of EPG5, siRNA based EPG5 knock-down, and CRISPR/Cas9 mediated EPG5 knock-out HeLa cells were generated. EPG5-depleted cells exhibited a complete block of autophagic flux caused by defective autophagosome-lysosome fusion. Unexpectedly, endocytic degradation was normal in both VICIS SFs and EPG5 depleted cells, suggesting that EPG5 function is limited to the regulation of autophagosome-lysosome fusion. |
| format |
article |
| author |
Ikumi Hori Takanobu Otomo Mitsuko Nakashima Fuyuki Miya Yutaka Negishi Hideaki Shiraishi Yutaka Nonoda Shinichi Magara Jun Tohyama Nobuhiko Okamoto Takeshi Kumagai Konomi Shimoda Yoshiya Yukitake Daigo Kajikawa Tomohiro Morio Ayako Hattori Motoo Nakagawa Naoki Ando Ichizo Nishino Mitsuhiro Kato Tatsuhiko Tsunoda Hirotomo Saitsu Yonehiro Kanemura Mami Yamasaki Kenjiro Kosaki Naomichi Matsumoto Tamotsu Yoshimori Shinji Saitoh |
| author_facet |
Ikumi Hori Takanobu Otomo Mitsuko Nakashima Fuyuki Miya Yutaka Negishi Hideaki Shiraishi Yutaka Nonoda Shinichi Magara Jun Tohyama Nobuhiko Okamoto Takeshi Kumagai Konomi Shimoda Yoshiya Yukitake Daigo Kajikawa Tomohiro Morio Ayako Hattori Motoo Nakagawa Naoki Ando Ichizo Nishino Mitsuhiro Kato Tatsuhiko Tsunoda Hirotomo Saitsu Yonehiro Kanemura Mami Yamasaki Kenjiro Kosaki Naomichi Matsumoto Tamotsu Yoshimori Shinji Saitoh |
| author_sort |
Ikumi Hori |
| title |
Defects in autophagosome-lysosome fusion underlie Vici syndrome, a neurodevelopmental disorder with multisystem involvement |
| title_short |
Defects in autophagosome-lysosome fusion underlie Vici syndrome, a neurodevelopmental disorder with multisystem involvement |
| title_full |
Defects in autophagosome-lysosome fusion underlie Vici syndrome, a neurodevelopmental disorder with multisystem involvement |
| title_fullStr |
Defects in autophagosome-lysosome fusion underlie Vici syndrome, a neurodevelopmental disorder with multisystem involvement |
| title_full_unstemmed |
Defects in autophagosome-lysosome fusion underlie Vici syndrome, a neurodevelopmental disorder with multisystem involvement |
| title_sort |
defects in autophagosome-lysosome fusion underlie vici syndrome, a neurodevelopmental disorder with multisystem involvement |
| publisher |
Nature Portfolio |
| publishDate |
2017 |
| url |
https://doaj.org/article/abd2bb894e10470690aae074befb794d |
| work_keys_str_mv |
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