De Novo and Bi-allelic Pathogenic Variants in NARS1 Cause Neurodevelopmental Delay Due to Toxic Gain-of-Function and Partial Loss-of-Function Effects.

Authors:
Andreea Manole Stephanie Efthymiou Emer O'Connor Marisa I Mendes Matthew Jennings Reza Maroofian Indran Davagnanam Kshitij Mankad Maria Rodriguez Lopez Vincenzo Salpietro Ricardo Harripaul Lauren Badalato Jagdeep Walia Christopher S Francklyn Alkyoni Athanasiou-Fragkouli Roisin Sullivan Sonal Desai Kristin Baranano Faisal Zafar Nuzhat Rana Muhammed Ilyas Alejandro Horga Majdi Kara Francesca Mattioli Alice Goldenberg Helen Griffin Amelie Piton Lindsay B Henderson Benyekhlef Kara Ayca Dilruba Aslanger Joost Raaphorst Rolph Pfundt Ruben Portier Marwan Shinawi Amelia Kirby Katherine M Christensen Lu Wang Rasim O Rosti Sohail A Paracha Muhammad T Sarwar Dagan Jenkins Jawad Ahmed Federico A Santoni Emmanuelle Ranza Justyna Iwaszkiewicz Cheryl Cytrynbaum Rosanna Weksberg Ingrid M Wentzensen Maria J Guillen Sacoto Yue Si Aida Telegrafi Marisa V Andrews Dustin Baldridge Heinz Gabriel Julia Mohr Barbara Oehl-Jaschkowitz Sylvain Debard Bruno Senger Frédéric Fischer Conny van Ravenwaaij Annemarie J M Fock Servi J C Stevens Jürg Bähler Amina Nasar John F Mantovani Adnan Manzur Anna Sarkozy Desirée E C Smith Gajja S Salomons Zubair M Ahmed Shaikh Riazuddin Saima Riazuddin Muhammad A Usmani Annette Seibt Muhammad Ansar Stylianos E Antonarakis John B Vincent Muhammad Ayub Mona Grimmel Anne Marie Jelsig Tina Duelund Hjortshøj Helena Gásdal Karstensen Marybeth Hummel Tobias B Haack Yalda Jamshidi Felix Distelmaier Rita Horvath Joseph G Gleeson Hubert Becker Jean-Louis Mandel David A Koolen Henry Houlden

Am J Hum Genet 2020 08 31;107(2):311-324. Epub 2020 Jul 31.

Department of Neuromuscular Disorders, University College London (UCL) Institute of Neurology, Queen Square, London, WC1N 3BG, UK. Electronic address:

Aminoacyl-tRNA synthetases (ARSs) are ubiquitous, ancient enzymes that charge amino acids to cognate tRNA molecules, the essential first step of protein translation. Here, we describe 32 individuals from 21 families, presenting with microcephaly, neurodevelopmental delay, seizures, peripheral neuropathy, and ataxia, with de novo heterozygous and bi-allelic mutations in asparaginyl-tRNA synthetase (NARS1). We demonstrate a reduction in NARS1 mRNA expression as well as in NARS1 enzyme levels and activity in both individual fibroblasts and induced neural progenitor cells (iNPCs). Molecular modeling of the recessive c.1633C>T (p.Arg545Cys) variant shows weaker spatial positioning and tRNA selectivity. We conclude that de novo and bi-allelic mutations in NARS1 are a significant cause of neurodevelopmental disease, where the mechanism for de novo variants could be toxic gain-of-function and for recessive variants, partial loss-of-function.

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Source
http://dx.doi.org/10.1016/j.ajhg.2020.06.016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7413890PMC
August 2020

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