Objective To explore the clinical features and the gene mutations in MECP 2 duplication syndrome. Methods The clinical data of a child with developmental retardation and hypophrenia accompanied with respiratory tract infection was analyzed retrospectively. Microarray analysis technique was used to detect the genes in the patient and his family. The pertinent literature was reviewed. Results A 1-year and 7-month old boy was found to have hypotonia, developmental delay, and recurrent respiratory tract infections after birth. Microarray analysis showed a duplication of 441.88kb in Xq28 area and diagnosis of MECP2 duplication syndrome was confirmed. His grandmother, mother, and two aunts were found duplication of 441.73-441.88kb in Xq28 area, all of whom were MECP2’s female carrier. Conclusions The improvement of chromosome chip technology inspection is helpful to the early diagnosis of MECP2 duplication syndrome.%目的：探讨甲基化CpG结合蛋白2基因（MECP2）重复综合征的临床特征及基因突变特点。方法回顾分析1例发育迟缓及智力低下伴呼吸道感染患儿的的临床资料，应用染色体微阵列芯片分析技术检测患儿及其家人的基因，并复习相关文献。结果患儿，男，1岁7个月，生后肌张力低下，发育延迟，反复呼吸道感染。应用染色体微阵列芯片分析技术检查发现患儿Xq28区域发生441.88 kb的重复，确诊MECP2重复综合征，其外祖母、母亲、母亲的2个妹妹发现Xq28区域发生441.73~441.88 kb的重复，为MECP2女性携带者。结论尽早完善染色体芯片技术检查有助于早期诊断MECP2重复综合征。
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