Genetic Diagnosis of Two Dopa-Responsive Dystonia Families by Exome Sequencing |
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| Authors: | Zhan-fang Sun Yu-han Zhang Ji-feng Guo Qi-ying Sun Jun-pu Mei Han-lin Zhou Li-ping Guan Jin-yong Tian Zheng-mao Hu Jia-da Li Kun Xia Xin-xiang Yan Bei-sha Tang |
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| Institution: | 1. Department of Neurology, Xiangya Hospital, Central South University, Changsha, China.; 2. Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, China.; 3. State Key Laboratory of Medical Genetics, Central South University, Changsha, China.; 4. BGI-Shenzhen, Shenzhen, China.; University of Southern California, United States of America, |
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| Abstract: | Dopa-responsive dystonia, a rare disorder typically presenting in early childhood with lower limb dystonia and gait abnormality, responds well to levodopa. However, it is often misdiagnosed with the wide spectrum of phenotypes. By exome sequencing, we make a rapid genetic diagnosis for two atypical dopa-responsive dystonia pedigrees. One pedigree, presented with prominent parkinsonism, was misdiagnosed as Parkinson''s disease until a known mutation in GCH1 (GTP cyclohydrolase 1) gene ({"type":"entrez-nucleotide","attrs":{"text":"NM_000161.2","term_id":"66932966","term_text":"NM_000161.2"}}NM_000161.2: c.631_632delAT, p.Met211ValfsX38) was found. The other pedigree was detected with a new compound heterozygous mutation in TH (tyrosine hydroxylase) gene ({"type":"entrez-nucleotide","attrs":{"text":"NM_000360.3","term_id":"88900502","term_text":"NM_000360.3"}}NM_000360.3: c.911C>T, p.Ala304Val) and ({"type":"entrez-nucleotide","attrs":{"text":"NM_000360.3","term_id":"88900502","term_text":"NM_000360.3"}}NM_000360.3: c.1358G>A, p.Arg453His)], whose proband, a pregnant woman, required a rapid and less-biased genetic diagnosis. In conclusion, we demonstrated that exome sequencing could provide a precise and rapid genetic testing in the diagnosis of Mendelian diseases, especially for diseases with wide phenotypes. |
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