The distinct genetic pattern of ALS in Turkey and novel mutations

PubMedID: 25681989 The frequency of amyotrophic lateral sclerosis (ALS) mutations has been extensively investigated in several populations; however, a systematic analysis in Turkish cases has not been reported so far. In this study, we screened 477 ALS patients for mutations, including 116 familial ALS patients from 82 families and 361 sporadic ALS (sALS) cases. Patients were genotyped for C9orf72 (18.3%), SOD1 (12.2%), FUS (5%), TARDBP (3.7%), and UBQLN2 (2.4%) gene mutations, which together account for approximately 40% of familial ALS in Turkey. No SOD1 mutations were detected in sALS patients; however, C9orf72 (3.1%) and UBQLN2 (0.6%) explained 3.7% of sALS in the population. Exome sequencing revealed mutations in OPTN, SPG11, DJ1, PLEKHG5, SYNE1, TRPM7, and SQSTM1 genes, many of them novel. The spectrum of mutations reflect both the distinct genetic background and the heterogeneous nature of the Turkish ALS population. © 2015 Elsevier Inc. 99HB0101 02OB0101 04B101D 08HB102 10B01P8 11B01P6 TUBITAK-SBAG2007 COST-TUBITAK-SBAG2007 TUBITAK-EVRENA-SBAG2009 British Association for Psychopharmacology This study was supported by Suna and İnan Kıraç Foundation (SVIKV) (2005–2008, 2008–2011, 2011–2014) , Bogazici University (Grant number 99HB0101 02OB0101 04B101D 08HB102 10B01P8 11B01P6) Research Funds (BAP), and The Scientific and Technological Research Council of Turkey (TUBITAK-SBAG2007 COST-TUBITAK-SBAG2007 TUBITAK-EVRENA-SBAG2009) . We gratefully acknowledge their generous contributions. We thank Ilknur Yıldız, Selda Dağdeviren, Irmak Şahbaz, Alireza Khodadadi Jamayran, Helena Alstermark, and Anna Birve for their excellent technical assistance. We extend our thanks to Professor Jeffrey D. Macklis (Harvard Medical School, MA, USA) and Professor Peter Andersen (Umea University, Umea, Sweden) for their constructive contributions to this study; to Professor Coşkun Özdemir and Dr Sevtap Savaş for the critical reading of the manuscript; and to Cemile Koçoğlu, Fulya Akçimen, and Hamid Hamzeiy for their assistance in the preparation of the figures and tables. Last but not least, we cordially thank our patients, their families, and the Turkish ALS Association for their invaluable cooperation. This study is dedicated to the memory of our esteemed collaborator Dr Hilmi Özçelik, who passed away on May 2, 2013. Appendix A