RT Journal Article
SR Electronic
T1 SNP located in an <em>AluJb</em> repeat downstream of <em>TMCO1,</em> rs4657473, is protective for POAG in African Americans
JF British Journal of Ophthalmology
JO Br J Ophthalmol
FD BMJ Publishing Group Ltd.
SP 1530
OP 1536
DO 10.1136/bjophthalmol-2018-313086
VO 103
IS 10
A1 Lana Verkuil
A1 Ian Danford
A1 Maxwell Pistilli
A1 David W Collins
A1 Harini V Gudiseva
A1 Ben T Trachtman
A1 Jie He
A1 Sonika Rathi
A1 Naqi Haider
A1 Gui-shuang Ying
A1 Venkata R M Chavali
A1 Joan Marie O'Brien
YR 2019
UL http://bjo.bmj.com/content/103/10/1530.abstract
AB Aims To determine the association of single nucleotide polymorphisms (SNPs) downstream from the TMCO1 gene with primary open-angle glaucoma (POAG) in African Americans (AA).Methods AA subjects were recruited for the Primary Open-Angle African American Glaucoma Genetics (POAAGG) study from the Scheie Eye Institute and its satellite sites in Philadelphia. A region containing an AluJb repeat and seven SNPs, including rs4656461 near the TMCO1 gene, were PCR-Sanger sequenced from POAAGG cases (n=1537) and controls (n=1570). Association between POAG and SNPs near TMCO1 was investigated by logistic regression analysis. Phenotypic trait associations with these SNPs were assessed by analysis of variance. Electrophoretic mobility shift assay (EMSA) was performed to assess the affinity of human T-box 5 (TBX5) protein for a predicted binding motif in the TMCO1 region. Dual Luciferase assays were performed by transfecting recombinant plasmids containing the region surrounding the above SNPs in HEK293T and trabecular meshwork cells.Results The SNP rs4657473 (C&gt;T) was associated with POAG; the TT genotype was protective (OR 0.20, 95% CI 0.09 to 0.42; p&lt;0.001). No significant associations were found between the TMCO1 variants and phenotypic traits. EMSA confirmed the affinity of TBX5 for a predicted binding motif containing TMCO1 SNP rs4657475. Luciferase assays demonstrated a regulatory function for the genomic region around SNP rs4656561, located within AluJb repeat.Conclusion Our results demonstrate that a SNP downstream of TMCO1, rs4657473, is associated with POAG in an AA population. Our studies suggest a regulatory role for the previously POAG-associated locus near the TMCO1 gene that may affect gene expression.