目的 研究1例常染色体隐性遗传Allgrove综合征患儿的AAAS基因突变情况,高临床医生对Allgrove综合征的认识.方法 收集临床资料,取先证者及其父母外周血DNA,采用PCR扩增对该家系进行突变检测,并采用亚克隆测序鉴定其基因突变.通过在线软件Mutation Taster预测AAAS基因突变致病性,Swiss Model构建蛋白三级结构.结果 研究发现先证者AAAS基因第15号外显子存在一种新的杂合插入突变c.1347_1348insG(p.Gly450fsX495),先证者及母亲存在杂合无义突变c.688C>T(p.Arg230X),先证者及父母存在纯合同义突变c.855C>T(p.Phe285Phe).先证者发生的AAAS基因复合杂合突变(c.688C>T,c.1347_1348insG)是该患者Allgrove综合征的致病原因.结论 本文AAAS基因杂合插入突变(c.1347_1348insG)为首次报道,建议对婴幼儿期诊断原发性肾上腺皮质功能减退的患者开展AAAS等基因检测,以免误诊.%Objective To study the AAAS gene mutations in a child with autosomal recessive Allgrove syndrome. Methods Clinical data were collected and blood samples were obtained from the proband of Allgrove syndrome and her parents. Genomic DNA was extracted and sequenced by PCR amplification. Subclone sequencing was performed to validate the gene mutations. The disease-causing potentials of mutation genes were evaluated by the Mutation Taster, and the target protein tertiary structure was modelled by the Swiss Model. Results A new heterozygous insertion mutation(c. 1347_1348insG) of exon 15 in the proband was identified and firstly reported. Other two reported mutations were detected, which were the heterozygous mutation c. 688C>T in the patient and her mother, and the homozygous mutation c. 855C>T in the proband and her parents. In addition, it was confirmed that the novel compound heterozygous mutations(c. 688C>T, c. 1347_1348insG) in the AAAS gene of the proband were pathogenic mutation locus. Conclusion The heterozygous mutation(c. 1347_1348insG) of AAAS gene was firstly reported. In case of the patients being clinically misdiagnosed, related-gene detection should be performed for the patients who were diagnosed with primary adrenal insufficiency during the period of infants and young childhood.
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