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Abstract #89943 Published in IGR 21-3
EAAT1 variants associated with glaucoma
Yanagisawa M; Namekata K; Aida T; Katou S; Takeda T; Harada T; Fuse N; The Glaucoma Gene Research Group ; Tanaka KBiochemical and Biophysical Research Communications 2020; 529: 943-949
Glaucoma is one of the leading causes of blindness characterized by progressive loss of retinal ganglion cells (RGCs) and their axons. We reported that glutamate/aspartate transporter (GLAST) knockout mice showed progressive RGC loss and optic nerve degeneration that are similar to glaucoma. To explore the possibility that rare variants in the EAAT1 gene (the human homolog of GLAST) cause susceptibility to glaucoma, we performed targeted sequencing of EAAT1 in 440 patients with glaucoma and 450 control subjects. We identified 8 rare variants in 20 out of 440 patients, including 4 synonymous and 4 missense variants located at protein coding regions. One of these rare variants (rs117295512) showed significant association with the risk of glaucoma (OR = 10.44, P = 0.005). Furthermore, the allele frequency for loss-of-function EAAT1 variants, pAla169Gly and pAla329Thr, was 5.5 folds higher in the glaucoma (1.1%) compared with the control cohort (0.2%). These findings suggest that these rare variants may contribute to the pathogenesis of glaucoma and that loss-of-function variants in EAAT1 are present in a small number of patients with glaucoma.
Laboratory of Molecular Neuroscience, Medical Research Institute, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.
Full articleClassification:
3.4.2 Gene studies (Part of: 3 Laboratory methods > 3.4 Molecular genetics)