Clinical and molecular findings in a Moroccan family with Jervell and Lange-Nielsen syndrome: a case report

被引：3
作者：
Adadi N. [1 ,2 ]
Lahrouchi N. [3 ]
Bouhouch R. [4 ]
Fellat I. [4 ]
Amri R. [5 ]
Alders M. [6 ]
Sefiani A. [1 ,2 ]
Bezzina C. [3 ]
Ratbi I. [2 ]
机构：
[1] Centre de Génomique Humaine, Faculté de Médecine et Pharmacie, Mohammed V University, Rabat
[2] Département de Génétique Médicale, Institut National d’Hygiène, Rabat
[3] Department of Clinical and Experimental Cardiology, Academic Medical Center, University of Amsterdam, Amsterdam
[4] Electrophysiologie et Stimulation Cardiaque, Clinique Belvédère, Rabat
[5] Service de Cardiologie B, CHU Ibn Sina, Rabat
[6] Department of Clinical Genetics, Academic Medical Center, University of Amsterdam, Amsterdam
来源：
Journal of Medical Case Reports | / 11卷 / 1期
关键词：
Deafness; Jervell and Lange-Nielsen syndrome; Long QT syndrome; Moroccan; Mutation;
D O I：
10.1186/s13256-017-1243-1
中图分类号：
学科分类号：
摘要：
Background: Jervell and Lange-Nielsen syndrome (Online Mendelian Inheritance in Man 220400) is a rare autosomal recessive cardioauditory ion channel disorder that affects 1/200,000 to 1/1,000,000 children. It is characterized by congenital profound bilateral sensorineural hearing loss, a long QT interval, ventricular tachyarrhythmias, and episodes of torsade de pointes on an electrocardiogram. Cardiac symptoms arise mostly in early childhood and consist of syncopal episodes during periods of stress, exercise, or fright and are associated with a high risk of sudden cardiac death. Jervell and Lange-Nielsen syndrome is caused by homozygous or compound heterozygous mutations in KCNQ1 on 11p15.5 or KCNE1 on 1q22.1-q22.2. Case presentation: We report the case of a 10-year-old Moroccan boy with congenital hearing loss and severely prolonged QT interval who presented with multiple episodes of syncope. His parents are first-degree cousins. We performed Sanger sequencing and identified a homozygous variant in KCNQ1 (c.1343dupC, p.Glu449Argfs*14). Conclusions: The identification of the genetic substrate in this patient confirmed the clinical diagnosis of Jervell and Lange-Nielsen syndrome and allowed us to provide him with appropriate management and genetic counseling to his family. In addition, this finding contributes to our understanding of genetic disease in the Moroccan population. © 2017 The Author(s).
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