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Intronic ATTTC repeat expansions in STARD7 in familial adult myoclonic epilepsy linked to chromosome 2

2019; Nature Portfolio; Volume: 10; Issue: 1 Linguagem: Inglês

10.1038/s41467-019-12671-y

2041-1723

Mark Corbett, Thessa Kroes, Liana Veneziano, Mark F. Bennett, Rahel T. Florian, Amy L. Schneider, Antonietta Coppola, Laura Licchetta, Silvana Franceschetti, Antonio Suppa, Aaron M. Wenger, Davide Mei, Manuela Pendziwiat, Sabine Kaya, Massimo Delledonne, Rachel Straussberg, Luciano Xumerle, Brigid M. Regan, Douglas E. Crompton, Anne‐Fleur van Rootselaar, Anthony Correll, Rachael Catford, Francesca Bisulli, Shreyasee Chakraborty, Sara Baldassari, Paolo Tinuper, Kirston Barton, Shaun Carswell, Martin A. Smith, Alfredo Berardelli, Renée Carroll, Alison Gardner, Kathryn Friend, Ilan Blatt, Michele Iacomino, Carlo Di Bonaventura, Salvatore Striano, Julien Buratti, Boris Keren, Caroline Nava, Sylvie Forlani, Gabrielle Rudolf, Édouard Hirsch, Eric LeGuern, Pierre Labauge, Simona Balestrini, Josemir W. Sander, Zaid Afawi, Ingo Helbig, Hiroyuki Ishiura, Shoji Tsuji, Sanjay M. Sisodiya, Giorgio Casari, Lynette G. Sadleir, Riaan van Coller, Marina A.J. Tijssen, Karl Martin Klein, Arn M. J. M. van den Maagdenberg, Federico Zara, Renzo Guerrini, Samuel F. Berkovic, Tommaso Pippucci, Laura Canafoglia, Melanie Bahlo, Pasquale Striano, Ingrid E. Scheffer, Francesco Brancati, Christel Depienne, Jozef Gécz,

Neurological disorders and treatments

Familial Adult Myoclonic Epilepsy (FAME) is characterised by cortical myoclonic tremor usually from the second decade of life and overt myoclonic or generalised tonic-clonic seizures. Four independent loci have been implicated in FAME on chromosomes (chr) 2, 3, 5 and 8. Using whole genome sequencing and repeat primed PCR, we provide evidence that chr2-linked FAME (FAME2) is caused by an expansion of an ATTTC pentamer within the first intron of STARD7. The ATTTC expansions segregate in 158/158 individuals typically affected by FAME from 22 pedigrees including 16 previously reported families recruited worldwide. RNA sequencing from patient derived fibroblasts shows no accumulation of the AUUUU or AUUUC repeat sequences and STARD7 gene expression is not affected. These data, in combination with other genes bearing similar mutations that have been implicated in FAME, suggest ATTTC expansions may cause this disorder, irrespective of the genomic locus involved.