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Germline variants in tumor suppressor FBXW7 lead to impaired ubiquitination and a neurodevelopmental syndrome.


ABSTRACT: Neurodevelopmental disorders are highly heterogenous conditions resulting from abnormalities of brain architecture and/or function. FBXW7 (F-box and WD-repeat-domain-containing 7), a recognized developmental regulator and tumor suppressor, has been shown to regulate cell-cycle progression and cell growth and survival by targeting substrates including CYCLIN E1/2 and NOTCH for degradation via the ubiquitin proteasome system. We used a genotype-first approach and global data-sharing platforms to identify 35 individuals harboring de novo and inherited FBXW7 germline monoallelic chromosomal deletions and nonsense, frameshift, splice-site, and missense variants associated with a neurodevelopmental syndrome. The FBXW7 neurodevelopmental syndrome is distinguished by global developmental delay, borderline to severe intellectual disability, hypotonia, and gastrointestinal issues. Brain imaging detailed variable underlying structural abnormalities affecting the cerebellum, corpus collosum, and white matter. A crystal-structure model of FBXW7 predicted that missense variants were clustered at the substrate-binding surface of the WD40 domain and that these might reduce FBXW7 substrate binding affinity. Expression of recombinant FBXW7 missense variants in cultured cells demonstrated impaired CYCLIN E1 and CYCLIN E2 turnover. Pan-neuronal knockdown of the Drosophila ortholog, archipelago, impaired learning and neuronal function. Collectively, the data presented herein provide compelling evidence of an F-Box protein-related, phenotypically variable neurodevelopmental disorder associated with monoallelic variants in FBXW7.

SUBMITTER: Stephenson SEM 

PROVIDER: S-EPMC9069070 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature

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Germline variants in tumor suppressor FBXW7 lead to impaired ubiquitination and a neurodevelopmental syndrome.

Stephenson Sarah E M SEM   Costain Gregory G   Blok Laura E R LER   Silk Michael A MA   Nguyen Thanh Binh TB   Dong Xiaomin X   Alhuzaimi Dana E DE   Dowling James J JJ   Walker Susan S   Amburgey Kimberly K   Hayeems Robin Z RZ   Rodan Lance H LH   Schwartz Marc A MA   Picker Jonathan J   Lynch Sally A SA   Gupta Aditi A   Rasmussen Kristen J KJ   Schimmenti Lisa A LA   Klee Eric W EW   Niu Zhiyv Z   Agre Katherine E KE   Chilton Ilana I   Chung Wendy K WK   Revah-Politi Anya A   Au P Y Billie PYB   Griffith Christopher C   Racobaldo Melissa M   Raas-Rothschild Annick A   Ben Zeev Bruria B   Barel Ortal O   Moutton Sebastien S   Morice-Picard Fanny F   Carmignac Virginie V   Cornaton Jenny J   Marle Nathalie N   Devinsky Orrin O   Stimach Chandler C   Wechsler Stephanie Burns SB   Hainline Bryan E BE   Sapp Katie K   Willems Marjolaine M   Bruel Ange-Line AL   Dias Kerith-Rae KR   Evans Carey-Anne CA   Roscioli Tony T   Sachdev Rani R   Temple Suzanna E L SEL   Zhu Ying Y   Baker Joshua J JJ   Scheffer Ingrid E IE   Gardiner Fiona J FJ   Schneider Amy L AL   Muir Alison M AM   Mefford Heather C HC   Crunk Amy A   Heise Elizabeth M EM   Millan Francisca F   Monaghan Kristin G KG   Person Richard R   Rhodes Lindsay L   Richards Sarah S   Wentzensen Ingrid M IM   Cogné Benjamin B   Isidor Bertrand B   Nizon Mathilde M   Vincent Marie M   Besnard Thomas T   Piton Amelie A   Marcelis Carlo C   Kato Kohji K   Koyama Norihisa N   Ogi Tomoo T   Goh Elaine Suk-Ying ES   Richmond Christopher C   Amor David J DJ   Boyce Jessica O JO   Morgan Angela T AT   Hildebrand Michael S MS   Kaspi Antony A   Bahlo Melanie M   Friðriksdóttir Rún R   Katrínardóttir Hildigunnur H   Sulem Patrick P   Stefánsson Kári K   Björnsson Hans Tómas HT   Mandelstam Simone S   Morleo Manuela M   Mariani Milena M   Scala Marcello M   Accogli Andrea A   Torella Annalaura A   Capra Valeria V   Wallis Mathew M   Jansen Sandra S   Weisfisz Quinten Q   de Haan Hugoline H   Sadedin Simon S   Lim Sze Chern SC   White Susan M SM   Ascher David B DB   Schenck Annette A   Lockhart Paul J PJ   Christodoulou John J   Tan Tiong Yang TY  

American journal of human genetics 20220401 4


Neurodevelopmental disorders are highly heterogenous conditions resulting from abnormalities of brain architecture and/or function. FBXW7 (F-box and WD-repeat-domain-containing 7), a recognized developmental regulator and tumor suppressor, has been shown to regulate cell-cycle progression and cell growth and survival by targeting substrates including CYCLIN E1/2 and NOTCH for degradation via the ubiquitin proteasome system. We used a genotype-first approach and global data-sharing platforms to i  ...[more]

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