Cited by 173Retinal Diseases and TreatmentsGenetic Associations and EpidemiologyRetinal Development and Disorders

Dissection of genomewide-scan data in extended families reveals a major locus and oligogenic susceptibility for age-related macular degeneration

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Iyengar, Sudha K., Song, Danhong, Klein, Barbara E.K., Klein, Ronald, Schick, James H., Humphrey, Jennifer, Millard, Christopher, Liptak, Rachel +5 more·2004·The American Journal of Human Genetics

Abstract

To examine the genetic basis of age-related macular degeneration (ARMD), a degenerative disease of the retinal pigment epithelium and neurosensory retina, we conducted a genomewide scan in 34 extended families (297 individuals, 349 sib pairs) ascertained through index cases with neovascular disease or geographic atrophy. Family and medical history was obtained from index cases and family members. Fundus photographs were taken of all participating family members, and these were graded for severity by use of a quantitative scale. Model-free linkage analysis was performed, and tests of heterogeneity and epistasis were conducted. We have evidence of a major locus on chromosome 15q (GATA50C03 multipoint P=1.98x10-7; empirical P< or =1.0x10-5; single-point P=3.6x10-7). This locus was present as a weak linkage signal in our previous genome scan for ARMD, in the Beaver Dam Eye Study sample (D15S659, multipoint P=.047), but is otherwise novel. In this genome scan, we observed a total of 13 regions on 11 chromosomes (1q31, 2p21, 4p16, 5q34, 9p24, 9q31, 10q26, 12q13, 12q23, 15q21, 16p12, 18p11, and 20q13), with a nominal multipoint significance level of P< or =.01 or LOD > or =1.18. Family-by-family analysis of the data, performed using model-free linkage methods, suggests that there is evidence of heterogeneity in these families. For example, a single family (family 460) individually shows linkage evidence at 8 loci, at the level of P<.0001. We conducted tests for heterogeneity, which suggest that ARMD susceptibility loci on chromosomes 9p24, 10q26, and 15q21 are not present in all families. We tested for mutations in linked families and examined SNPs in two candidate genes, hemicentin-1 and EFEMP1, in subsamples (145 and 189 sib pairs, respectively) of the data. Mutations were not observed in any of the 11 exons of EFEMP1 nor in exon 104 of hemicentin-1. The SNP analysis for hemicentin-1 on 1q31 suggests that variants within or in very close proximity to this gene cause ARMD pathogenesis. In summary, we have evidence for a major ARMD locus on 15q21, which, coupled with numerous other loci segregating in these families, suggests complex oligogenic patterns of inheritance for ARMD.

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Crossref · 10.1086/380912

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Authors
Iyengar, S. K., Song, D., Klein, B. E. K., Klein, R., Schick, J. H., Humphrey, J., Millard, C., Liptak, R., Russo, K., Jun, G., Lee, K. E., Fijal, B., & Elston, R. C.
Affiliations
  • Case Western Reserve University (US)
  • University of Wisconsin–Madison (US)
Corresponding author
Iyengar, Sudha K.
Venue
The American Journal of Human Genetics
Publisher
Elsevier BV
Published
2004-01
Volume
74
Issue
1
Pages
20-39
ISSN
0002-9297 (ISSN-L)
OpenAlex
W1968744211
Cited by
173
References
73
Citations by year
2025: 3 · 2024: 2 · 2023: 2 · 2022: 5 · 2021: 7 · 2020: 2 · 2019: 3 · 2018: 3 · 2017: 3 · 2016: 7 · 2015: 1 · 2014: 4 · 2013: 10 · 2012: 9
FWCI
25.21
Type
journal article
Language
en
Open access
Locations
  • The American Journal of Human Genetics (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Public Health Service
  • National Heart, Lung, and Blood Institute (HL07567, T32HL007567)
  • National Eye Institute (U10 EY06594, U10EY006594, EY10605, R01EY010605)
  • National Institute of General Medical Sciences (GM-28356, R37GM028356, R01GM028356)
  • National Center for Research Resources (RR-03655, P41RR003655)
Topics
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
Keywords
age-related macular degeneration, genetic susceptibility, chromosome 15q, oligogenic inheritance, family heterogeneity, epistasis, neovascular disease, geographic atrophy, EFEMP1, extended family, Beaver Dam Eye Study, retinal pigment epithelium degeneration, candidate genes, single nucleotide polymorphisms
MeSH terms
Aged, Aging, Chromosome Mapping, Female, Genetic Markers, Humans, Lod Score, Macular Degeneration, Male, Middle Aged, Phenotype, Genome, Human, Genetic Predisposition to Disease, Siblings

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