DNA sequence variants in the LOXL1 gene are associated with pseudoexfoliation glaucoma in a U.S. clinic-based population with broad ethnic diversity.
BACKGROUND
Pseudoexfoliation syndrome is a major risk factor for glaucoma in many populations throughout the world. Using a U.S. clinic-based case control sample with broad ethnic diversity, we show that three common SNPs in LOXL1 previously associated with pseudoexfoliation in Nordic populations are significantly associated with pseudoexfoliation syndrome and pseudoexfoliation glaucoma.


METHODS
Three LOXL1 SNPs were genotyped in a patient sample (206 pseudoexfoliation, 331 primary open angle glaucoma, and 88 controls) from the Glaucoma Consultation Service at the Massachusetts Eye and Ear Infirmary. The SNPs were evaluation for association with pseudeoexfoliation syndrome, pseudoexfoliation glaucoma, and primary open angle glaucoma.


RESULTS
The strongest association was found for the G allele of marker rs3825942 (G153D) with a frequency of 99% in pseudoexfoliation patients (with and without glaucoma) compared with 79% in controls (p = 1.6 x 10-15; OR = 20.93, 95%CI: 8.06, 54.39). The homozygous GG genotype is also associated with pseudoexfoliation when compared to controls (p = 1.2 x 10-12; OR = 23.57, 95%CI: 7.95, 69.85). None of the SNPs were significantly associated with primary open angle glaucoma.


CONCLUSIONS
The pseudoexfoliation syndrome is a common cause of glaucoma. These results indicate that the G153D LOXL1 variant is significantly associated with an increased risk of pseudoexfoliation and pseudoexfoliation glaucoma in an ethnically diverse patient population from the Northeastern United States. Given the high prevalence of pseudooexfoliation in this geographic region, these results also indicate that the G153D LOXL1 variant is a significant risk factor for adult-onset glaucoma in this clinic based population.
Fan
Bao Jian
BJ
Department of Ophthalmology, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, USA. BaoJian_Fan@meei.harvard.edu
Pasquale
Louis
L
Grosskreutz
Cynthia L
CL
Rhee
Douglas
D
Chen
Teresa
T
DeAngelis
Margaret M
MM
Kim
Ivana
I
del Bono
Elizabeth
E
Miller
Joan W
JW
Li
Tiansen
T
Haines
Jonathan L
JL
Wiggs
Janey L
JL
D001741:Black or African American; D000368:Aged; D000483:Alleles; D000594:Amino Acid Oxidoreductases / Q000235:genetics*; D001483:Base Sequence; D016022:Case-Control Studies; D017889:Exfoliation Syndrome / Q000150:complications / Q000208:ethnology / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D014644:Genetic Variation; D005902:Glaucoma, Open-Angle / Q000208:ethnology / Q000209:etiology / Q000235:genetics*; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D008297:Male; D008404:Massachusetts; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D020641:Polymorphism, Single Nucleotide; D017422:Sequence Analysis, DNA; D044465:White People
D000594:Amino Acid Oxidoreductases; C445313:LOXL1 protein, human