オオトモ　タカノブ   Takanobu Otomo   大友　孝信    所属   川崎医科大学  医学部 基礎医学　分子遺伝医学    職種   教授
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Biallelic VPS35L pathogenic variants cause 3C/Ritscher-Schinzel-like syndrome through dysfunction of retriever complex.
掲載誌名	正式名：Journal of medical genetics 略　 称：J Med Genet ISSNコード：14686244/00222593
掲載区分	国外
巻・号・頁	57(4),pp.245-253
著者・共著者	Kato Kohji, Oka Yasuyoshi, Muramatsu Hideki, Vasilev Filipp F, Otomo Takanobu, Oishi Hisashi, Kawano Yoshihiko, Kidokoro Hiroyuki, Nakazawa Yuka, Ogi Tomoo, Takahashi Yoshiyuki, Saitoh Shinji
発行年月	2020/04
概要	BACKGROUND:3C/Ritscher-Schinzel syndrome is characterised by congenital cranio-cerebello-cardiac dysplasia, where CCDC22 and WASHC5 are accepted as the causative genes. In combination with the retromer or retriever complex, these genes play a role in endosomal membrane protein recycling. We aimed to identify the gene abnormality responsible for the pathogenicity in siblings with a 3C/Ritscher-Schinzel-like syndrome, displaying cranio-cerebello-cardiac dysplasia, coloboma, microphthalmia, chondrodysplasia punctata and complicated skeletal malformation.METHODS:Exome sequencing was performed to identify pathogenic variants. Cellular biological analyses and generation of knockout mice were carried out to elucidate the gene function and pathophysiological significance of the identified variants.RESULTS:We identified compound heterozygous pathogenic variants (c.1097dup; p.Cys366Trpfs*28 and c.2755G>A; p.Ala919Thr) in the VPS35L gene, which encodes a core protein of the retriever complex. The identified missense variant lacked the ability to form the retriever complex, and the frameshift variant induced non-sense-mediated mRNA decay, thereby confirming biallelic loss of function of VPS35L. In addition, VPS35L knockout cells showed decreased autophagic function in nutrient-rich and starvation conditions, as well as following treatment with Torin 1. We also generated Vps35l-/- mice and demonstrated that they were embryonic lethal at an early stage, between E7.5 and E10.5.CONCLUSIONS:Our results suggest that biallelic loss-of-function variants in VPS35L underlies 3C/Ritscher-Schinzel-like syndrome. Furthermore, VPS35L is necessary for autophagic function and essential for early embryonic development. The data presented here provide a new insight into the critical role of the retriever complex in fetal development.
DOI	10.1136/jmedgenet-2019-106213
PMID	31712251