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Polymorphisms in ARMS2/HTRA1 and complement genes and age-related macular degeneration in India: findings from the INDEYE study.

AbstractPURPOSE:
Association between genetic variants in complement factor H (CFH), factor B (CFB), component 2 (C2), and in the ARMS2/HTRA1 region with age-related macular degeneration (AMD) comes mainly from studies of European ancestry and case-control studies of late-stage disease. We investigated associations of both early and late AMD with these variants in a population-based study of people aged 60 years and older in India.
METHODS:
Fundus images were graded using the Wisconsin Age-Related Maculopathy Grading System and participants assigned to one of four mutually exclusive stages based on the worse affected eye (0 = no AMD, 1-3 = early AMD, 4 = late AMD). Multinomial logistic regression was used to derive risk ratios (RR) accounting for sampling method and adjusting for age, sex, and study center.
RESULTS:
Of 3569 participants, 53.2% had no signs of amd, 45.6% had features of early amd, and 1.2% had late amd. CFH (RS1061170), C2 (RS547154), OR CFB (RS438999) was not associated with early or late AMD. In the ARMS2 locus, RS10490924 was associated with both early (adjusted RR 1.22, 95% confidence interval [CI]: 1.13-1.33, P < 0.0001) and late AMD (adjusted RR 1.81, 95% CI: 1.15-2.86; P = 0.01); rs2672598 was associated only with early AMD (adjusted RR 1.12, 95% CI: 1.02-1.23; P = 0.02); rs10490923 was not associated with early or late AMD.
CONCLUSIONS:
Two variants in ARMS2/HTRA1 were associated with increased risk of early AMD, and for one of these, the increased risk was also evident for late AMD. The study provides new insights into the role of these variants in early stages of AMD in India.
AuthorsPeriasamy Sundaresan, Praveen Vashist, Ravilla D Ravindran, Ashwini Shanker, Dorothea Nitsch, Bareng A S Nonyane, Liam Smeeth, Usha Chakravarthy, Astrid E Fletcher
JournalInvestigative ophthalmology & visual science (Invest Ophthalmol Vis Sci) Vol. 53 Issue 12 Pg. 7492-7 (Nov 2012) ISSN: 1552-5783 [Electronic] United States
PMID23060141 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • ARMS2 protein, human
  • Complement C2
  • Proteins
  • DNA
  • HtrA1 protein, human
  • Serine Endopeptidases
Topics
  • Aged
  • Complement C2 (genetics, metabolism)
  • DNA (genetics)
  • Female
  • Gene Frequency
  • Genetic Predisposition to Disease
  • Genotype
  • Humans
  • India (epidemiology)
  • Macular Degeneration (epidemiology, genetics, metabolism)
  • Male
  • Middle Aged
  • Polymorphism, Genetic
  • Prevalence
  • Proteins (genetics, metabolism)
  • Serine Endopeptidases (genetics, metabolism)

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