Unstable TTTTA/TTTCA expansions in MARCH6 are associated with Familial Adult Myoclonic Epilepsy type 3

FAME consortium, Rahel T Florian, Florian Kraft, Elsa Leitão, Sabine Kaya, Stephan Klebe, Eloi Magnin, Anne-Fleur van Rootselaar, Julien Buratti, Theresa Kühnel, Christopher Schröder, Sebastian Giesselmann, Nikolai Tschernoster, Janine Altmueller, Anaide Lamiral, Boris Keren, Caroline Nava, Delphine Bouteiller, Sylvie Forlani, Ludmila JorneaRegina Kubica, Tao Ye, Damien Plassard, Bernard Jost, Vincent Meyer, Jean-François Deleuze, Yannick Delpu, Mario D M Avarello, Lisanne S Vijfhuizen, Gabrielle Rudolf, Edouard Hirsch, Thessa Kroes, Philipp S Reif, Felix Rosenow, Christos Ganos, Marie Vidailhet, Lionel Thivard, Alexandre Mathieu, Thomas Bourgeron, Ingo Kurth, Haloom Rafehi, Laura Steenpass, Bernhard Horsthemke, Eric LeGuern, Karl Martin Klein, Pierre Labauge, Mark F Bennett, Melanie Bahlo, Jozef Gecz, Mark A Corbett, Marina A J Tijssen

Research output: Contribution to journalArticleAcademicpeer-review

58 Citations (Scopus)
101 Downloads (Pure)


Familial Adult Myoclonic Epilepsy (FAME) is a genetically heterogeneous disorder characterized by cortical tremor and seizures. Intronic TTTTA/TTTCA repeat expansions in SAMD12 (FAME1) are the main cause of FAME in Asia. Using genome sequencing and repeat-primed PCR, we identify another site of this repeat expansion, in MARCH6 (FAME3) in four European families. Analysis of single DNA molecules with nanopore sequencing and molecular combing show that expansions range from 3.3 to 14 kb on average. However, we observe considerable variability in expansion length and structure, supporting the existence of multiple expansion configurations in blood cells and fibroblasts of the same individual. Moreover, the largest expansions are associated with micro-rearrangements occurring near the expansion in 20% of cells. This study provides further evidence that FAME is caused by intronic TTTTA/TTTCA expansions in distinct genes and reveals that expansions exhibit an unexpectedly high somatic instability that can ultimately result in genomic rearrangements.

Original languageEnglish
Article number4919
Number of pages14
JournalNature Communications
Issue number1
Publication statusPublished - 29-Oct-2019


  • SEQ
  • DNA

Cite this