Xi Chen1, Tingliang Liu1, Meirong Huang1, Jinjin Wu1, Junxue Zhu1, Ying Guo1, Xinyi Xu1, Fen Li1, Jian Wang2, Lijun Fu1,3. 1. 1 Department of Cardiology, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine , Shanghai, China . 2. 2 Research Division of Birth Defects, Institute of Pediatric Translational Medicine, Shanghai Children's Medical Center, Shanghai Jiaotong University School of Medicine , Shanghai, China . 3. 3 Research Division of Cardiovascular Disease, Institute of Pediatric Translational Medicine, Shanghai Children's Medical Center, Shanghai Jiaotong University School of Medicine , Shanghai, China .
Abstract
AIMS: We sought to understand the clinical course and molecular defects of infantile-onset Pompe disease (IOPD) among mainland Chinese patients. MATERIALS AND METHODS: Twenty-five Chinese patients with IOPD were enrolled and clinical data were retrospectively reviewed. The entire coding region of the GAA gene was amplified by polymerase chain reaction and analyzed by direct sequencing. RESULTS: The median age at symptom onset was 3.4 months (range: 1.0-7.1 months) and 4.9 months (range: 2.7-8.3 months) at diagnosis. Only one patient received enzyme replacement therapy (ERT) and this child survived beyond the age of 2 years. Of the 24 patients not receiving ERT, all, but one patient, died at a median age of 8.3 months (range: 4.0-12.2 months). Thirteen novel and two common GAA mutations were identified in this study. The allelic frequency of c.2662G > T (p.Glu888X) was 23.1% in northern Chinese patients and 4.2% in southern Chinese patients, whereas the allelic frequency of c.1935C > A (p.Asp645Glu) was 20.8% in southern and 3.8% in northern Chinese patients. CONCLUSIONS: We identified the most common mutations in southern and northern Chinese patients with IOPD.
AIMS: We sought to understand the clinical course and molecular defects of infantile-onset Pompe disease (IOPD) among mainland Chinese patients. MATERIALS AND METHODS: Twenty-five Chinese patients with IOPD were enrolled and clinical data were retrospectively reviewed. The entire coding region of the GAA gene was amplified by polymerase chain reaction and analyzed by direct sequencing. RESULTS: The median age at symptom onset was 3.4 months (range: 1.0-7.1 months) and 4.9 months (range: 2.7-8.3 months) at diagnosis. Only one patient received enzyme replacement therapy (ERT) and this child survived beyond the age of 2 years. Of the 24 patients not receiving ERT, all, but one patient, died at a median age of 8.3 months (range: 4.0-12.2 months). Thirteen novel and two common GAA mutations were identified in this study. The allelic frequency of c.2662G > T (p.Glu888X) was 23.1% in northern Chinese patients and 4.2% in southern Chinese patients, whereas the allelic frequency of c.1935C > A (p.Asp645Glu) was 20.8% in southern and 3.8% in northern Chinese patients. CONCLUSIONS: We identified the most common mutations in southern and northern Chinese patients with IOPD.