Mutations in the INF2 gene account for a significant proportion of familial but not sporadic focal and segmental glomerulosclerosis

被引:89
作者
Barua, Moumita [1 ]
Brown, Elizabeth J. [1 ,2 ]
Charoonratana, Victoria T. [1 ,2 ]
Genovese, Giulio [1 ]
Sun, Hua [1 ]
Pollak, Martin R. [1 ]
机构
[1] Beth Israel Deaconess Med Ctr, Dept Med, Div Nephrol, Boston, MA 02215 USA
[2] Boston Childrens Hosp, Dept Med, Div Nephrol, Boston, MA USA
基金
加拿大健康研究院; 美国国家卫生研究院;
关键词
familial FSGS; FSGS; INF2; mutations; nephrotic syndrome; sporadic cases; CONGENITAL NEPHROTIC SYNDROME; GLOMERULAR PROTEIN; FORMIN; ACTIN; RHO; ALPHA-ACTININ-4; BIOPSY; NPHS2; TRPC6;
D O I
10.1038/ki.2012.349
中图分类号
R5 [内科学]; R69 [泌尿科学(泌尿生殖系疾病)];
学科分类号
1002 ; 100201 ;
摘要
Mutations in the inverted formin 2 gene (INF2) have recently been identified as the most common cause of autosomal dominant focal and segmental glomerulosclerosis (FSGS). To quantify the contribution of various genes contributing to FSGS, we sequenced INF2 where all mutations have previously been described (exons 2 to 5) in a total of 215 probands and 281 sporadic individuals with FSGS, along with other known genes accounting for autosomal dominant FSGS (ACTN4, TRPC6, and CD2AP) in 213 probands. Variants were classified as disease-causing if they altered the amino acid sequence and if they were not found in control samples and in families segregated with disease. Mutations in INF2 were found in a total of 20 of the 215 families (including those previously reported) in our cohort of autosomal dominant familial nephrotic syndrome or FSGS, thereby explaining disease in 9%. INF2 mutations were found in 2 of 281 individuals with sporadic FSGS. In contrast, ACTN4- and TRPC6-related diseases accounted for 3 and 2% of our familial cohort, respectively. INF2-related disease showed variable penetrance, with onset of disease ranging widely from childhood to adulthood, and commonly leading to end-stage renal disease in the third and fourth decade of life. Thus, mutations in INF2 are a more common, although still a minor, monogenic cause of familial FSGS when compared with other known autosomal dominant genes associated with FSGS. Kidney International (2013) 83, 316-322; doi:10.1038/ki.2012.349; published online 26 September 2012
引用
收藏
页码:316 / 322
页数:7
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