PURPOSE: We describe the clinical, neurophysiologic, and genetic features of a new, large family with familial cortical myoclonic tremor and epilepsy (FCMTE). METHODS: Reliable clinical information was obtained on the 127 members. Thirty-one collaborative individuals were assessed by a detailed clinical interview and a complete neurologic examination. A polygraphic study was conducted in 15 patients, back-averaging analysis and somatosensory evoked potentials with C-reflex study in four. The genetic study investigated 30 subjects with microsatellite markers at three loci on chromosomes 8q (FCMTE1), 2p (FCMTE2), and 5p (FCMTE3). KEY FINDINGS: The pedigree included 25 affected members (M/F: 9/16). We studied 16 of the 19 living affected members (M/F: 5/11; mean age 47.8 years). Cortical myoclonic tremor (CMT) was associated with generalized seizures in 10 patients (62.5%). The mean age at onset of CMT and seizures was 28.1 and 33.8 years, respectively. Four patients (25%) reported a slow progression of CMT, with severe gait impairment in one. Psychiatric disorders of variable severity recurred in 37.5% of cases. Rhythmic bursts at 7-15 Hz were recorded in all 11 affected members tested. Additional neurophysiologic investigations disclosed a cortical origin of myoclonus in all patients tested. Generalized epileptiform discharges were recorded in 25% of cases, and a photoparoxysmal response in 31%. Genetic analysis established linkage to the FCMTE2 locus on chromosome 2p11.1-2q12.2 (OMIM 607876) and narrowed the critical interval to a 10.4 Mb segment. Haplotype analysis in the present family identified a founder haplotype identical to that previously observed in families from the same geographic area. SIGNIFICANCE: This study confirms evidence of a founder effect in Italian families and reduces the number of positional candidate genes in the FCMTE2 locus to 59, thereby contributing to future gene identification by Next Generation Sequencing approaches. Wiley Periodicals, Inc.
PURPOSE: We describe the clinical, neurophysiologic, and genetic features of a new, large family with familial cortical myoclonic tremor and epilepsy (FCMTE). METHODS: Reliable clinical information was obtained on the 127 members. Thirty-one collaborative individuals were assessed by a detailed clinical interview and a complete neurologic examination. A polygraphic study was conducted in 15 patients, back-averaging analysis and somatosensory evoked potentials with C-reflex study in four. The genetic study investigated 30 subjects with microsatellite markers at three loci on chromosomes 8q (FCMTE1), 2p (FCMTE2), and 5p (FCMTE3). KEY FINDINGS: The pedigree included 25 affected members (M/F: 9/16). We studied 16 of the 19 living affected members (M/F: 5/11; mean age 47.8 years). Cortical myoclonic tremor (CMT) was associated with generalized seizures in 10 patients (62.5%). The mean age at onset of CMT and seizures was 28.1 and 33.8 years, respectively. Four patients (25%) reported a slow progression of CMT, with severe gait impairment in one. Psychiatric disorders of variable severity recurred in 37.5% of cases. Rhythmic bursts at 7-15 Hz were recorded in all 11 affected members tested. Additional neurophysiologic investigations disclosed a cortical origin of myoclonus in all patients tested. Generalized epileptiform discharges were recorded in 25% of cases, and a photoparoxysmal response in 31%. Genetic analysis established linkage to the FCMTE2 locus on chromosome 2p11.1-2q12.2 (OMIM 607876) and narrowed the critical interval to a 10.4 Mb segment. Haplotype analysis in the present family identified a founder haplotype identical to that previously observed in families from the same geographic area. SIGNIFICANCE: This study confirms evidence of a founder effect in Italian families and reduces the number of positional candidate genes in the FCMTE2 locus to 59, thereby contributing to future gene identification by Next Generation Sequencing approaches. Wiley Periodicals, Inc.
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: Tom van den Ende; Sarvi Sharifi; Sandra M A van der Salm; Anne-Fleur van Rootselaar Journal: Tremor Other Hyperkinet Mov (N Y) Date: 2018-01-23
Authors: Mark A Corbett; Thessa Kroes; Liana Veneziano; Mark F Bennett; Rahel Florian; Amy L Schneider; Antonietta Coppola; Laura Licchetta; Silvana Franceschetti; Antonio Suppa; Aaron Wenger; Davide Mei; Manuela Pendziwiat; Sabine Kaya; Massimo Delledonne; Rachel Straussberg; Luciano Xumerle; Brigid Regan; Douglas Crompton; Anne-Fleur van Rootselaar; Anthony Correll; Rachael Catford; Francesca Bisulli; Shreyasee Chakraborty; Sara Baldassari; Paolo Tinuper; Kirston Barton; Shaun Carswell; Martin Smith; Alfredo Berardelli; Renee Carroll; Alison Gardner; Kathryn L Friend; Ilan Blatt; Michele Iacomino; Carlo Di Bonaventura; Salvatore Striano; Julien Buratti; Boris Keren; Caroline Nava; Sylvie Forlani; Gabrielle Rudolf; Edouard 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 Gecz Journal: Nat Commun Date: 2019-10-29 Impact factor: 14.919