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Lardelli, Rea M; Schaffer, Ashleigh E; Eggens, Veerle R C; Zaki, Maha S; Grainger, Stephanie; Sathe, Shashank; Van Nostrand, Eric L; Schlachetzki, Zinayida; Rosti, Basak; Akizu, Naiara; Scott, Eric; Silhavy, Jennifer L; Heckman, Laura Dean; Rosti, Rasim Ozgur; Dikoglu, Esra; Gregor, Anne; Guemez-Gamboa, Alicia; Musaev, Damir; Mande, Rohit; Widjaja, Ari; Shaw, Tim L; Markmiller, Sebastian; Marin-Valencia, Isaac; Davies, Justin H; de Meirleir, Linda; Kayserili, Hulya; Altunoglu, Umut; Freckmann, Mary Louise; Warwick, Linda; Chitayat, David; Blaser, Susan; Çağlayan, Ahmet Okay; Bilguvar, Kaya; Per, Huseyin; Fagerberg, Christina; Christesen, Henrik T; Kibaek, Maria; Aldinger, Kimberly A; Manchester, David; Matsumoto, Naomichi; Muramatsu, Kazuhiro; Saitsu, Hirotomo; Shiina, Masaaki; Ogata, Kazuhiro; Foulds, Nicola; Dobyns, William B; Chi, Neil C; Traver, David; Spaccini, Luigina; Bova, Stefania Maria; Gabriel, Stacey B; Gunel, Murat; Valente, Enza Maria; Nassogne, Marie-Cecile; Bennett, Eric J; Yeo, Gene W; Baas, Frank; Lykke-Andersen, Jens; Gleeson, Joseph G
Nature genetics, 03/2017, Letnik: 49, Številka: 3Journal Article
Deadenylases are best known for degrading the poly(A) tail during mRNA decay. The deadenylase family has expanded throughout evolution and, in mammals, consists of 12 Mg -dependent 3'-end RNases with substrate specificity that is mostly unknown. Pontocerebellar hypoplasia type 7 (PCH7) is a unique recessive syndrome characterized by neurodegeneration and ambiguous genitalia. We studied 12 human families with PCH7, uncovering biallelic, loss-of-function mutations in TOE1, which encodes an unconventional deadenylase. toe1-morphant zebrafish displayed midbrain and hindbrain degeneration, modeling PCH-like structural defects in vivo. Surprisingly, we found that TOE1 associated with small nuclear RNAs (snRNAs) incompletely processed spliceosomal. These pre-snRNAs contained 3' genome-encoded tails often followed by post-transcriptionally added adenosines. Human cells with reduced levels of TOE1 accumulated 3'-end-extended pre-snRNAs, and the immunoisolated TOE1 complex was sufficient for 3'-end maturation of snRNAs. Our findings identify the cause of a neurodegenerative syndrome linked to snRNA maturation and uncover a key factor involved in the processing of snRNA 3' ends.
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