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- Title
Intronic ATTTC repeat expansions in STARD7 in familial adult myoclonic epilepsy linked to chromosome 2.
- Authors
Corbett, Mark A.; Kroes, Thessa; Veneziano, Liana; Bennett, Mark F.; Florian, Rahel; Schneider, Amy L.; Coppola, Antonietta; Licchetta, Laura; Franceschetti, Silvana; Suppa, Antonio; Wenger, Aaron; Mei, Davide; Pendziwiat, Manuela; Kaya, Sabine; Delledonne, Massimo; Straussberg, Rachel; Xumerle, Luciano; Regan, Brigid; Crompton, Douglas; van Rootselaar, Anne-Fleur
- Abstract
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. Familial cortical myoclonic tremor (FAME) has so far been mapped to regions on chromosome 2, 3, 5 and 8 and pentameric repeat expansions in SAMD12 were identified as cause of FAME1. Here, Corbett et al. identify ATTTT/ATTTC repeat expansions in intron 1 of STARD7 in individuals with FAME2."
- Subjects
EPILEPSY; CHROMOSOMES; LOCUS (Genetics); RNA sequencing; GENE expression
- Publication
Nature Communications, 2019, Vol 10, Issue 1, pN.PAG
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-019-12671-y