Functional Variants in the Promoter Region of Chitinase 3–Like 1 (CHI3L1) and Susceptibility to Schizophrenia  Xinzhi Zhao, Ruqi Tang, Bo Gao, Yongyong.

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Functional Variants in the Promoter Region of Chitinase 3–Like 1 (CHI3L1) and Susceptibility to Schizophrenia  Xinzhi Zhao, Ruqi Tang, Bo Gao, Yongyong Shi, Jian Zhou, Shengzhen Guo, Jing Zhang, Yabing Wang, Wei Tang, Junwei Meng, Sheng Li, Hongsheng Wang, Gang Ma, Chuwen Lin, Yue Xiao, Guoyin Feng, Zhiguang Lin, Shaomin Zhu, Yangling Xing, Hong Sang, David St. Clair, Lin He  The American Journal of Human Genetics  Volume 80, Issue 1, Pages 12-18 (January 2007) DOI: 10.1086/510438 Copyright © 2007 The American Society of Human Genetics Terms and Conditions

Figure 1 Genomic structure of CHI3L1 and the location of SNPs included in the present study. The American Journal of Human Genetics 2007 80, 12-18DOI: (10.1086/510438) Copyright © 2007 The American Society of Human Genetics Terms and Conditions

Figure 2 Luciferase reporter assay of SNP2, SNP3, and SNP4 common haplotypes in U251 cells. The transcriptional activity of the pCBG99 control was set at 100%. Each CHI3L1 haplotype was tested eight times. Among the haplotypes, the risk haplotype (CCC) revealed the lowest activity, whereas the protective haplotype (TTG) showed the highest activity (P=2.2×10−7, by one-way ANOVA). The American Journal of Human Genetics 2007 80, 12-18DOI: (10.1086/510438) Copyright © 2007 The American Society of Human Genetics Terms and Conditions

Figure 3 In vitro binding of U251 nuclear proteins to CHI3L1 promoter sequences containing SNP3 and SNP4. In lanes 1–4 and 9–10, probes of major alleles for each SNP were loaded. In lanes 5–8, probes of minor alleles for each SNP were loaded. Competitors are the unlabeled oligonucleotides with same allele as probes, and cross-competitors are the oligonucleotides with the other allele of probes. a, No obvious difference shown between the two alleles of SNP3. b, G-allele probes of SNP4 generating two binding complexes (lane 2), whereas C-allele probes generated one (lane 6). Loading 100× cross-competitors (C allele) does not eliminate the G-allele–specific band (lane 4). c, Supershift assay for the G-allele probes of SNP4 with use of antibodies of AP-2 and MYC. The presence of either of the antibodies resulted in a visible supershift band. The American Journal of Human Genetics 2007 80, 12-18DOI: (10.1086/510438) Copyright © 2007 The American Society of Human Genetics Terms and Conditions

Figure 4 Effect of inhibition of the MYC/MAX signaling pathways on CHI3L1 expression. In both cell lines, MYC-inhibitor trial severely reduces expression level of CHI3L1 (76% decreased in U251 and 82% decreased in THP-1). Double asterisk (**) indicates P<.01. The American Journal of Human Genetics 2007 80, 12-18DOI: (10.1086/510438) Copyright © 2007 The American Society of Human Genetics Terms and Conditions

Figure 5 Expression analyses of CHI3L1 in vivo. a, Expression level of CHI3L1 in the PBC from patients with schizophrenia and unaffected controls. The average level of CHI3L1 in unaffected controls was defined as 100. No significant difference in expression level between the two groups was detected (t test P=.081). b and c, Expression of CHI3L1 was associated with the genotype of both SNP4 (b) and SNP3 (c) in PBC (Kruskal-Wallis H test P<.01). d, Haplotypes in the promoter region of CHI3L1 associated with expression level of the gene in PBC. e, Relative allele-specific expression of the SNP5 data expressed as allele ratios of A/G. Patients who were heterozygotes for SNP4 revealed highly significant allele differences (t test P=9.1×10−6, corrected for 5 tests) f, Risperidone-treated mice did not change the mRNA level of CHI3L1 in blood and brain (t test P>.05). The expression level of CHI3L1 in untreated mice was defined as 100. The American Journal of Human Genetics 2007 80, 12-18DOI: (10.1086/510438) Copyright © 2007 The American Society of Human Genetics Terms and Conditions

Figure 6 Hypothetical scenario for CHI3L1 in the pathophysiology of schizophrenia. Impairment of AKT signaling and overactivation of immune responses were observed in the subjects with schizophrenia and were considered to contribute to the risk of schizophrenia. The CHI3L1 gene may partly compensate the alteration of the processes and, therefore, may play a role in preventing the progression of psychosis. The American Journal of Human Genetics 2007 80, 12-18DOI: (10.1086/510438) Copyright © 2007 The American Society of Human Genetics Terms and Conditions