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

Moumita Barua, Elizabeth J. Brown, Victoria T. Charoonratana, Giulio Genovese, Hua Sun, Martin R. Pollak

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)316-322
Number of pages7
JournalKidney International
Volume83
Issue number2
DOIs
StatePublished - Feb 2013

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Focal Segmental Glomerulosclerosis
Mutation
Genes
Dominant Genes
Penetrance
Nephrotic Syndrome
Chronic Kidney Failure
Amino Acid Sequence
Exons

Keywords

  • familial FSGS
  • FSGS
  • INF2
  • mutations
  • nephrotic syndrome
  • sporadic cases

ASJC Scopus subject areas

  • Nephrology

Cite this

Mutations in the INF2 gene account for a significant proportion of familial but not sporadic focal and segmental glomerulosclerosis. / Barua, Moumita; Brown, Elizabeth J.; Charoonratana, Victoria T.; Genovese, Giulio; Sun, Hua; Pollak, Martin R.

In: Kidney International, Vol. 83, No. 2, 02.2013, p. 316-322.

Research output: Contribution to journalArticle

Barua, Moumita ; Brown, Elizabeth J. ; Charoonratana, Victoria T. ; Genovese, Giulio ; Sun, Hua ; Pollak, Martin R. / Mutations in the INF2 gene account for a significant proportion of familial but not sporadic focal and segmental glomerulosclerosis. In: Kidney International. 2013 ; Vol. 83, No. 2. pp. 316-322.
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