title: Genetic polymorphisms of the renin-angiotensin system and the outcome of focal segmental glomerulosclerosis in children.
abstract: BACKGROUND
  The clinical course of primary focal segmental glomerulosclerosis (FSGS) in children is variable, with some patients having a much more rapidly progressing course than others. The purpose of our study was to compare the frequency of three polymorphisms of the renin-angiotensin system (RAS) in children with FSGS with that in healthy controls of matching ethnic groups, and to determine whether the clinical outcome of FSGS was associated with different RAS genotypes.
  
  
  METHODS
  Three RAS genotypes were examined in 47 Jewish and Arab children with biopsy-proven primary FSGS and in a large control group: the ACE insertion/deletion polymorphism in intron 16, the M235T mutation in the angiotensinogen gene, and the A1166C in the angiotensin II type 1 receptor gene (AT1R).
  
  
  RESULTS
  Arab patients showed a greater tendency towards progressive renal disease than their Jewish counterparts (12 of 21 vs. 9 of 26, P = 0.05) and were less likely to achieve remission (3 of 21 vs. 11 of 26, P < 0.04), despite similar clinical presentation, medical management and follow-up. The RAS allele prevalence was similar among patients and controls of matching ethnic backgrounds, and no difference in allele frequency was found between Arabs and Jews. Homozygotes for the ACE insertion genotype (II) were significantly less likely to have progressive renal disease than patients with the other genotypes (ID and DD; 0 of 6 vs. 21 of 41; P < 0.022). The other RAS polymorphisms were not associated with variations in the clinical course of childhood FSGS.
  
  
  CONCLUSIONS
  Homozygosity for the ACE insertion allele may have a protective effect in children with FSGS and can serve as a positive prognostic indicator at diagnosis. The D allele may exert a detrimental dominant effect on outcome. Neither the ACE gene polymorphism nor the other RAS polymorphisms studied are associated with disease prevalence. The AT1R and angiotensinogen gene polymorphisms are not associated with progression of renal disease in FSGS. Ethnic differences in the clinical course of the disease are not linked to these polymorphisms.
authors.affiliation: Department of Surgery A, Shaare Zedek Medical Center Jerusalem, Israel. yaacov@md2.huji.ac.il
authors.forename: Y
authors.initials: Y
authors.lastname: Frishberg
authors.forename: R
authors.initials: R
authors.lastname: Becker-Cohen
authors.forename: D
authors.initials: D
authors.lastname: Halle
authors.forename: E
authors.initials: E
authors.lastname: Feigin
authors.forename: B
authors.initials: B
authors.lastname: Eisenstein
authors.forename: R
authors.initials: R
authors.lastname: Halevy
authors.forename: D
authors.initials: D
authors.lastname: Lotan
authors.forename: I
authors.initials: I
authors.lastname: Juabeh
authors.forename: N
authors.initials: N
authors.lastname: Ish-Shalom
authors.forename: D
authors.initials: D
authors.lastname: Magen
authors.forename: Y
authors.initials: Y
authors.lastname: Shvil
authors.forename: L
authors.initials: L
authors.lastname: Sinai-Treiman
authors.forename: A
authors.initials: A
authors.lastname: Drukker
mesh_terms: D000293:Adolescent; D000483:Alleles; D000808:Angiotensinogen / Q000235:genetics; D002648:Child; D002675:Child, Preschool; D004251:DNA Transposable Elements; D018450:Disease Progression; D005260:Female; D017353:Gene Deletion; D005923:Glomerulosclerosis, Focal Segmental / Q000453:epidemiology / Q000235:genetics* / Q000503:physiopathology*; D006801:Humans; D008297:Male; D007703:Peptidyl-Dipeptidase A / Q000235:genetics; D011110:Polymorphism, Genetic / Q000235:genetics*; D015995:Prevalence; D011379:Prognosis; D012084:Renin-Angiotensin System / Q000235:genetics*
chemical_list: D004251:DNA Transposable Elements; D000808:Angiotensinogen; D007703:Peptidyl-Dipeptidase A