Objective: To analyze the clinical characteristics of 6 children with TTC21B-related nephronophthisis to provide reference for early clinical diagnosis. Methods: The general condition, clinical manifestations, laboratory tests and other clinical data of 6 children from 4 families diagnosed with nephronophthisis by genetic testing in Shanghai Children's Hospital from January 2015 to December 2020 were analyzed retrospectively. Results: A total of 6 children (3 males and 3 females) developed proteinuria and progressive renal dysfunction in early infancy. The onset age of proteinuria was 18 (6, 25) months. The age at the onset of renal impairment was 22 (10, 36) months. All 6 children progressed to end-stage renal disease (ESRD) within 10 (4, 65) months of onset. Five children had hypertension, 3 children with abnormal liver function, 2 children with visceral translocation and 1 child with growth retardation. The genetic results suggested that all children carried variations TTC21B gene p.C518R. Conclusions: Children with TTC21B gene p.C518R nephronophthisis had proteinuria and progressed to ESRD at the early stage of life. These nephronophthisis patients commonly presented with liver and renal dysfunction.
目的： 分析6例确诊为TTC21B基因相关肾消耗病患儿的临床特点，为临床早期诊断提供参考。 方法： 回顾性分析上海市儿童医院2015年1月至2020年12月经基因检测确诊为肾消耗病12型的4个家系共6例患儿的一般情况、临床表现、实验室检查、基因检测结果等临床资料。 结果： 6例患儿中女3例、男3例，均于婴幼儿早期出现蛋白尿并进行性肾功能减退，出现蛋白尿时的年龄为 18（6，25）月龄。肾功能损伤开始时年龄为 22（10，36）月龄，所有患儿均在发病后 10（4，65）个月内进展至终末期肾病。5例患儿出现高血压，3例肝功能异常，2例内脏反位，1例生长发育迟缓。基因检测结果提示患儿均有TTC21B 基因p.C518R位点变异。 结论： TTC21B基因 p.C518R肾消耗病患儿在早期即出现蛋白尿，进入终末期肾病的时间早，且多伴有肝肾联合受损。.