Defects in autophagosome-lysosome fusion underlie Vici syndrome, a neurodevelopmental disorder with multisystem involvement

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 KatoTatsuhiko Tsunoda, Hirotomo Saitsu, Yonehiro Kanemura, Mami Yamasaki, Kenjiro Kosaki, Naomichi Matsumoto, Tamotsu Yoshimori, Shinji Saitoh

研究成果: Article査読

17 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号3552
ジャーナルScientific reports
7
1
DOI
出版ステータスPublished - 2017 12 1

ASJC Scopus subject areas

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