BACKGROUND: Familial cortical myoclonic tremor with epilepsy (FCMTE) is defined by autosomal dominant adult-onset cortical myoclonus (CM) and seizures in 40% of patients. Two loci, 8q23.3-q24.11 (FAME1/FCMTE1) and 2p11.1-q12.2 (FAME2/FCMTE2), were previously reported without an identified gene. Unlinked families argue for a third mutated gene. METHODS: A genome-wide scan was performed in a large FCMTE family using Linkage-12 microarrays (Illumina). Refinement of the locus on 5p was performed by genotyping 13 polymorphic microsatellite markers in the 45 available family members. RESULTS: This large French FCMTE family included 16 affected relatives. The first symptoms were CM in 5 patients (31.2%), seizures in 5 patients (31.2%), and both at the same time in 6 patients (37.5%). A total of 12.5% (2/16) had only CM without seizures. The genome-wide scan identified a single region on 5p15.31-p15, with a multipoint lod score of 3.66. Further genotyping of all family members confirmed that the region spans 9.31 Mb between D5S580 and D5S2096, 2-point lod scores reaching 6.3 at theta = 0 for D5S486. Sequencing of the SEMA5A and CTNND2 genes failed to detect mutations. CONCLUSIONS: We report the clinical and genetic characteristics of a large familial cortical myoclonic tremor with epilepsy family. The third gene maps to 5p15.31-p15. Identification of the mutated gene is ongoing.
BACKGROUND:Familial cortical myoclonic tremor with epilepsy (FCMTE) is defined by autosomal dominant adult-onset cortical myoclonus (CM) and seizures in 40% of patients. Two loci, 8q23.3-q24.11 (FAME1/FCMTE1) and 2p11.1-q12.2 (FAME2/FCMTE2), were previously reported without an identified gene. Unlinked families argue for a third mutated gene. METHODS: A genome-wide scan was performed in a large FCMTE family using Linkage-12 microarrays (Illumina). Refinement of the locus on 5p was performed by genotyping 13 polymorphic microsatellite markers in the 45 available family members. RESULTS: This large French FCMTE family included 16 affected relatives. The first symptoms were CM in 5 patients (31.2%), seizures in 5 patients (31.2%), and both at the same time in 6 patients (37.5%). A total of 12.5% (2/16) had only CM without seizures. The genome-wide scan identified a single region on 5p15.31-p15, with a multipoint lod score of 3.66. Further genotyping of all family members confirmed that the region spans 9.31 Mb between D5S580 and D5S2096, 2-point lod scores reaching 6.3 at theta = 0 for D5S486. Sequencing of the SEMA5A and CTNND2 genes failed to detect mutations. CONCLUSIONS: We report the clinical and genetic characteristics of a large familial cortical myoclonic tremor with epilepsy family. The third gene maps to 5p15.31-p15. Identification of the mutated gene is ongoing.
Authors: Jose Felix Martí-Massó; Alberto Bergareche; Vladimir Makarov; Javier Ruiz-Martinez; Ana Gorostidi; Adolfo López de Munain; Juan Jose Poza; Pasquale Striano; Joseph D Buxbaum; Coro Paisán-Ruiz Journal: J Mol Med (Berl) Date: 2013-08-20 Impact factor: 4.599
Authors: Lyndal Henden; Saskia Freytag; Zaid Afawi; Sara Baldassari; Samuel F Berkovic; Francesca Bisulli; Laura Canafoglia; Giorgio Casari; Douglas Ewan Crompton; Christel Depienne; Jozef Gecz; Renzo Guerrini; Ingo Helbig; Edouard Hirsch; Boris Keren; Karl Martin Klein; Pierre Labauge; Eric LeGuern; Laura Licchetta; Davide Mei; Caroline Nava; Tommaso Pippucci; Gabrielle Rudolf; Ingrid Eileen Scheffer; Pasquale Striano; Paolo Tinuper; Federico Zara; Mark Corbett; Melanie Bahlo Journal: Hum Genet Date: 2016-07-01 Impact factor: 4.132
Authors: Sarvi Sharifi; Eleonora Aronica; Johannes H T M Koelman; Marina A J Tijssen; Anne-Fleur Van Rootselaar Journal: Tremor Other Hyperkinet Mov (N Y) Date: 2012-08-28
Authors: Jonathan F Russell; Jamie L Steckley; Giovanni Coppola; Angelika F G Hahn; MacKenzie A Howard; Zachary Kornberg; Alden Huang; Seyed M Mirsattari; Barry Merriman; Eric Klein; Murim Choi; Hsien-Yang Lee; Andrew Kirk; Carol Nelson-Williams; Gillian Gibson; Scott C Baraban; Richard P Lifton; Daniel H Geschwind; Ying-Hui Fu; Louis J Ptáček Journal: Ann Neurol Date: 2012-08 Impact factor: 10.422