Spondyloenchondrodysplasia with immune dysregulation caused by ACP5 gene mutation: a case report and literature review / 中华实用儿科临床杂志

ABSTRACT

Objective:To summarize the clinical features and gene phenotype of children with spondyloenchondrodysplasia with immune dysregulation (SPENCDI) caused by ACP5 gene mutation. Methods:The medical data and genetic phenotype of a child diagnosed with SPENCDI in the Department of Pediatrics, the First Affiliated Hospital of Zhengzhou University in February 23, 2017 were analyzed retrospectively.Besides, " spondyloenchondrodysplasia" were taken as the search terms to perform the retrieval in CNKI, Wanfang Data, and PubMed, in an attempt to conduct the literature review.χ 2 test was used to compare the factors among children with different mutations. Results:The 4.5-year-old girl was admitted to hospital for complaint of " fever and chilblain-like rash" when she was 2 years old.She was diagnosed with systemic lupus erythematosus (SLE) concomitant with lupus nephritis.Methylprednisolone combined with cyclophosphamide, mycophenolate mofetil was used for the treatment.However, she experienced multiple infections, thrombocytopenia, limp, and growth retardation during the treatment.Genetic detection identified ACP5 gene compound hybrid mutation: c.779C>A and c. 770T>C.She was diagnosed with SPENCDI, and was subjected to follow-up.A total of 78 SPENCDI patients were retrieved from the databases, with various clinical manifestations of SPENCDI, commonly with skeletal involvement and immune phenotypes; 73.08% of the cases were positive for antinuclear antibodies, 57.69% of cases were positive for anti-double stranded-DNA antibodies and 34.62% of cases had neurological symptoms.In 58 cases, ACP5 gene mutations were detected, including 44 homozygous mutations and 14 compound heterozygous mutations.Patients with ACP5 gene homozygous mutation had a higher probability of consanguineous marriage in parents [56.82% (25/44 cases) vs.14.29% (2/14 cases)]; patients with ACP5 gene heterozygous mutation were more likely to develop SLE [64.29% (9/14 cases) vs.34.09% (15/44 cases)]( χ2=7.722, 3.992; all P<0.05). Conclusions:The majority of the ACP5 gene mutations are homozygous mutations in patients with SPENCDI, and heterozygous mutations are rare.The clinical manifestations of SPENCDI are various and complex, it is prone to develop autoimmune diseases, and there was no clear correlation between clinical features and gene phenotype in SPENCDI patients.