Significant association between the genetic variations in the 5' end of the N-methyl-D-aspartate receptor subunit gene GRIN1 and schizophrenia.
BACKGROUND
N-methyl-D-aspartate (NMDA) receptors play important roles in many neurophysiological processes. Evidence from previous studies indicate that NMDA receptors contribute to the pathophysiology of schizophrenia. Two NMDA receptor subunit genes, GRIN1 and GRIN2A, are both good candidate genes for schizophrenia.


METHODS
We genotyped five single nucleotide polymorphisms (SNPs) in GRIN1 and two in GRIN2A in 2455 Han Chinese subjects, including population- and family-based samples, and performed case-control and transmission disequilibrium test (TDT) analyses. A microsatellite in GRIN2A was genotyped in population-based samples and a Mann-Whitney U test was performed.


RESULTS
A highly significant association was detected at the 5' end of GRIN1. Analyses of single variants and multiple-locus haplotypes indicate that the association is mainly generated by rs11146020 (case-control study: p = .0000013, odds ratio = .61, 95% confidence interval .50-.74; TDT: p = .0019, T/NT = 79/123). No association was found in the GRIN2A polymorphisms.


CONCLUSIONS
Our results provide support for the hypothesis that NMDA receptors are an important factor in schizophrenia. Moreover, rs11146020 is located in 5' untranslated region where several functional elements have been found. Hence, the SNP is a potential candidate in altering risk for schizophrenia and worthy of further replication and functional study.
Bio-X Center, Shanghai Jiao Tong University, China.
Xinzhi
X
Zhao
Huafang
H
Li
Yongyong
Y
Shi
Ruqi
R
Tang
Wuyan
W
Chen
Jixia
J
Liu
Guoyin
G
Feng
Jianguo
J
Shi
Lijuan
L
Yan
Huijun
H
Liu
Lin
L
He
D024506:5' Flanking Region / Q000235:genetics*; D000328:Adult; D044466:Asian People; D002352:Carrier Proteins / Q000235:genetics*; D016022:Case-Control Studies; D003710:Demography; D005192:Family Health; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D014644:Genetic Variation; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D009419:Nerve Tissue Proteins / Q000235:genetics*; D016194:Receptors, N-Methyl-D-Aspartate / Q000235:genetics*; D012559:Schizophrenia / Q000235:genetics*; D018709:Statistics, Nonparametric
D002352:Carrier Proteins; C485668:GRIN1 protein, human; D009419:Nerve Tissue Proteins; D016194:Receptors, N-Methyl-D-Aspartate