Abstract

目的 探讨鸟氨酸氨甲酰基转移酶缺乏症(OTCD)的临床及遗传特点。 方法 总结郑州大学附属儿童医院收治的1个OTCD家系中两姐弟及其母亲的临床诊疗经过,分析其临床及遗传特点。 结果 先证者,女,2岁2个月起间断呕吐,伴意识障碍,肝功能损伤,血氨增高,血精氨酸降低,尿乳清酸、尿嘧啶增高,疑似OTCD,给予低蛋白饮食、药物及血液透析等治疗,于2岁8个月时死于脑疝。期间先证者母亲再次妊娠,并于产后第4天出现精神异常,于产后15 d死于多器官功能衰竭。产下的男婴于出生第4天死亡。提取先证者死亡后冻存血液中白细胞DNA,基因检测证实鸟氨酸氨甲酰基转移酶(OTC)基因c.275G>A杂合突变。患儿母亲存在相同突变。 结论 OTCD男女均可发病,同一家族成员个体差异显著。对于呕吐、意识障碍、肝功能损伤的患者,均应注意监测血氨水平,及早行基因检测,争取治疗时机,降低病死率。明确致病基因有助于遗传咨询,指导下一胎同胞的产前诊断。

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