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ROSARIA NARDELLO

A homozygous MED11 C-terminal variant causes a lethal neurodegenerative disease.

  • Autori: Elisa Calì 1, Sheng-Jia Lin 2, Clarissa Rocca 1, Yavuz Sahin 3, Aisha Al Shamsi 4, Salima El Chehadeh 5, Myriam Chaabouni 6, Kshitij Mankad 7, Evangelia Galanaki 1, Stephanie Efthymiou 1, Sniya Sudhakar 7, Alkyoni Athanasiou-Fragkouli 1, Tamer Çelik 8, Nejat Narlı 9, Sebastiano Bianca 10, David Murphy 11, Francisco Martins De Carvalho Moreira 12; SYNaPS Study Group; Andrea Accogli 13, Cassidy Petree 2, Kevin Huang 2, Kamel Monastiri 14, Masoud Edizadeh 3, Rosaria Nardello 11, Marzia Ognibene 15, Patrizia De Marco 15, Martino Ruggieri 16, Federico Zara 17, Pasquale Striano 18, Yavuz Åžahin 19, Lihadh Al-Gazali 20, Marie Therese Abi Warde 21, Benedicte Gerard 22, Giovanni Zifarelli 23, Christian Beetz 23, Sara Fortuna 24, Miguel Soler 25, Enza Maria Valente 26, Gaurav Varshney 2, Reza Maroofian 1, Vincenzo Salpietro 27, Henry Houlden 1, Nardello. Rosaria
  • Anno di pubblicazione: 2022
  • Tipologia: Articolo in rivista
  • OA Link: http://hdl.handle.net/10447/580372

Abstract

Purpose: The mediator (MED) multisubunit-complex modulates the activity of the transcriptional machinery, and genetic defects in different MED subunits (17, 20, 27) have been implicated in neurologic diseases. In this study, we identified a recurrent homozygous variant in MED11 (c.325C>T; p.Arg109Ter) in 7 affected individuals from 5 unrelated families. Methods: To investigate the genetic cause of the disease, exome or genome sequencing were performed in 5 unrelated families identified via different research networks and Matchmaker Exchange. Deep clinical and brain imaging evaluations were performed by clinical pediatric neurologists and neuroradiologists. The functional effect of the candidate variant on both MED11 RNA and protein was assessed using reverse transcriptase polymerase chain reaction and western blotting using fibroblast cell lines derived from 1 affected individual and controls and through computational approaches. Knockouts in zebrafish were generated using clustered regularly interspaced short palindromic repeats/Cas9. Results: The disease was characterized by microcephaly, profound neurodevelopmental impairment, exaggerated startle response, myoclonic seizures, progressive widespread neurodegeneration, and premature death. Functional studies on patient-derived fibroblasts did not show a loss of protein function but rather disruption of the C-terminal of MED11, likely impairing binding to other MED subunits. A zebrafish knockout model recapitulates key clinical phenotypes. Conclusion: Loss of the C-terminal of MED subunit 11 may affect its binding efficiency to other MED subunits, thus implicating the MED-complex stability in brain development and neurodegeneration.