rs1344706

Meta-analysis of ZNF804A SNPs in 13,452 schizophrenia cases and 17,826 controls from Asian populations found that rs1344706 was nominally associated with schizophrenia (P=4.26×10⁻², OR=1.048) and rs1366842 showed significant association (P=9.96×10⁻³, OR=1.095). These associations were strengthened when bipolar disorder samples were included (rs1344706: P=1.85×10⁻², OR=1.057), suggesting ZNF804A variants confer small but detectable risk for schizophrenia and related psychotic disorders in Asian populations.

This study investigated the impact of the ZNF804A rs1344706 schizophrenia risk polymorphism on hippocampal-prefrontal cortex functional connectivity and theta oscillations using multimodal MEG/fMRI imaging in 50 healthy homozygous volunteers (25 risk, 25 nonrisk). Risk allele homozygotes showed decreased intrahippocampal theta (MEG) but increased hippocampal-PFC coactivation (fMRI), with significant inverse correlation between these measures, suggesting hippocampal theta mediates the known ZNF804A-related changes in hippocampus-PFC connectivity.

This study examined the effects of ZNF804A rs1344706 (risk allele T vs. non-risk allele G) on cortical morphometry in 59 unmedicated first-episode schizophrenia patients and 60 healthy controls using structural MRI. The risk allele T was associated with thinner cortex (2.2-2.8% reduction), smaller cortical surface area (1.0-2.5% reduction), and lower cortical volume (0.5-5.6% reduction) in multiple brain regions including the bilateral precuneus, left precentral gyrus, and left superior frontal cortex in schizophrenia patients. Strikingly, the opposite pattern was observed in healthy controls, where the T allele was associated with increased cortical measurements in the same regions, suggesting differential pathogenic effects of the variant.

This functional study investigated neurophysiologic effects of genome-wide association study (GWAS)-derived schizophrenia (SCZ) and bipolar disorder (BPD) risk variants in 199 patients with psychotic illness and 74 healthy controls. The SCZ risk allele (G) at TCF4 rs17512836 showed significant association with reduced auditory P3 amplitude (P=0.00017) and delayed P3 latency (P=0.005), suggesting a mechanism involving compromised attention and working memory capacity in psychotic disorders.

This functional study examines ZNF804A gene expression in postmortem human brain tissue across the lifespan and in schizophrenia, bipolar disorder, and major depressive disorder. The study identifies a novel truncated ZNF804A transcript (E3E4) and demonstrates that the psychosis risk variant rs1344706 specifically affects fetal ZNF804A E3E4 mRNA expression (P=0.02), with TT homozygotes showing lower expression than G carriers (P=0.03). The truncated isoform is also differentially expressed across psychiatric diagnoses and shows increased expression in major depressive disorder and bipolar disorder but decreased expression in schizophrenia.

This fMRI study investigated the replication of rs1344706 genotype effects on brain functional connectivity in 94 healthy subjects. While previous studies reported decreased interhemispheric prefrontal cortex connectivity and increased fronto-hippocampal connectivity associated with rs1344706 risk alleles, this independent replication found partial support: no significant interhemispheric DLPFC coupling reduction, but confirmed increased functional connectivity between right DLPFC and hippocampal formations with higher risk allele count (exploratory analysis, P<0.05 uncorrected).

A pharmacogenetic study of 144 schizophrenia patients treated with atypical antipsychotics found that rs1344706 AA homozygotes (the ZNF804A risk allele) showed significantly poorer improvement in positive symptoms over 4 weeks (7.35 ± 0.46 points) compared to C allele carriers (9.41 ± 0.71 points, P = 0.022). This finding suggests ZNF804A influences antipsychotic response and may be a target for novel therapeutic interventions.

This study examined how the psychosis-risk allele A of rs1344706 in the ZNF804A gene affects white matter microstructure measured by diffusion tensor imaging (DTI) in 230 individuals (63 with schizophrenia, 43 with bipolar disorder, 124 controls). Homozygosity for the risk allele was associated with significantly reduced fractional anisotropy across widespread brain regions (medium effect size d=0.48 overall, large effect d=1.01 in schizophrenia alone), supporting a mechanism whereby this genome-wide identified variant influences psychosis susceptibility through white matter abnormalities.

This systematic review and validation study examined psychosis-associated SNPs and their effects on brain volumetry in 113 subjects (schizophrenia, bipolar disorder, at-risk mental state, and healthy controls). Of 25 studies identified in the systematic review implicating 7 SNPs in 5 genes, the authors tested these variants using voxel-based morphometry. They found FWER-corrected associations for CACNA1C rs769087-A with larger bilateral hippocampus and thalamus white matter (p = 0.026 and p = 0.036) and with larger superior frontal gyrus volume. Higher replication concordance was found for CACNA1C, ZNF804A, and BDNF variants, supporting their involvement in psychosis and brain structure.

This association study examined two ZNF804A polymorphisms (rs7597593 and rs1344706) in 706 non-clinical subjects for associations with positive schizotypy and psychotic-like experiences. rs7597593 showed significant associations with both traits (F=5.06, p=0.007 for schizotypy; F=4.07, p=0.02 for psychotic experiences), with effects driven by females—those carrying the C allele had higher scores than TT homozygotes. No significant associations were detected for rs1344706.

This study investigated the developmental expression pattern of Zfp804A, the rat homolog of the human schizophrenia susceptibility gene ZNF804A, in the developing rat brain and cultured neurons. Expression of Zfp804A was developmentally regulated, peaking around birth in the cortex and cerebellum (corresponding to second trimester in humans). Notably, ZFP804A protein was highly localized to growth cones of developing neurites, implicating it in neurite outgrowth and synapse formation. These findings support the hypothesis that the schizophrenia-associated polymorphism rs1344706, which reduces ZNF804A expression during prenatal development, may compromise growth cone function and lead to altered neural connectivity.

This case-control study identified biallelic combinations of genetic variants associated with vasovagal syncope using Bayesian statistical analysis in 175 VVS patients and 200 controls. Eleven pairwise combinations of SNPs from neurohumoral regulation genes and the 2q32.1 locus were identified, with five showing significant epistatic interactions. Key associations included COMT*G with OR=2.04 (p=0.0015) and COMT*G + ADORA2A*C/C with OR=2.78 (p<0.001), suggesting a common genetic background between syncope and cardiovascular pathology.

This comprehensive review examines the genomics of schizophrenia and pharmacogenomics of antipsychotic drugs, synthesizing evidence on over 200 genes associated with psychotic disorders. The authors discuss five categories of genes relevant to antipsychotic response: disease-associated genes, mechanism-of-action genes, drug metabolism genes (particularly CYP2D6, CYP2C19, CYP2C9, CYP3A4), drug transporter genes, and pleiotropic genes. The review details pharmacogenomic profiles of 20+ antipsychotic drugs and demonstrates significant ethnic and interindividual variation in drug metabolism phenotypes, with examples including CYP2D6 extensive metabolizers (55.71% of population), intermediate metabolizers (34.7%), poor metabolizers (2.28%), and ultra-rapid metabolizers (7.31%).

This review comprehensively summarizes the latest genetic studies on schizophrenia, including family studies (heritability ~80%), genome-wide association studies, epigenetic mechanisms, candidate gene investigations, and next-generation sequencing findings. Key GWAS findings identified 108 schizophrenia-associated loci including variants in MIR137 (rs1625579), TCF4 (rs12966547), CSMD1 (rs10503253), CACNA1C (rs4765905), ANK3 (rs10761482), and MHC region variants, with evidence for polygenetic inheritance involving both common SNPs and rare copy number variations.

This replication study evaluated six GWAS-identified schizophrenia risk loci in a German population of 2,154 individuals (937 with schizophrenia, 632 with bipolar disorder, 585 controls). Despite the original UK GWAS showing strong association with rs1344706 in ZNF804A (P = 1.61 × 10⁻⁷), none of the six GWAS risk alleles were significantly associated with psychosis in the German population. Notably, rs1344706 showed consistently negative results with OR = 1.08 (0.93-1.26 95% CI) for schizophrenia.

This functional study investigates the rat homolog Zfp804A of the schizophrenia susceptibility gene ZNF804A, which carries the risk variant rs1344706. The researchers found that Zfp804A expression is developmentally regulated in the brain, peaking around birth during neuronal differentiation, and is highly localized to growth cones in cultured neurons, implicating the gene in neurite elongation and growth cone function.

This comprehensive review synthesizes genomic and pharmacogenomic research in schizophrenia, discussing over 200 candidate genes associated with psychotic disorders, genetic mechanisms including copy number variants and microRNA alterations, and pharmacogenomic factors affecting antipsychotic efficacy and safety. Key genes covered include dopamine receptors (DRD1-5), dysbindin (DTNBP1), DISC1, neurotrophic factors, and metabolic enzymes such as CYP2D6, CYP3A4, and COMT, with emphasis on genotype-phenotype correlations in antipsychotic response and side effects.

This review of molecular genetic studies of ADHD in Han Chinese populations summarizes candidate gene studies across dopaminergic, noradrenergic, serotonergic, and enzymatic systems, along with the first GWAS in Chinese ADHD cases (n=1040) and controls (n=963). While no single gene has been definitively identified, significant associations include DRD4 7-repeat allele (OR=1.70, 95% CI 1.20-2.40, p=0.003 in males), DBH rs2519152, and various polymorphisms in COMT, NET1, and serotonin genes, though results remain inconsistent across studies.

This review examines molecular genetic studies of attention-deficit hyperactivity disorder (ADHD) in Han Chinese samples, including candidate gene studies, endophenotype research, genome-wide association studies, and pharmacogenomic investigations. Eight GWAS conducted for ADHD have been inconclusive with no genome-wide significant associations identified, though candidate gene studies have identified associations with dopaminergic (DAT1, DRD4, DRD2, DRD3), noradrenergic (NET1, ADRA2A, ADRA2C), serotonergic (SLC6A4, HTR genes), and metabolic pathway genes (COMT, MAOA, MAOB, DBH, TPH). A meta-analysis of DRD4 longer repeats showed OR=1.70-1.74 in males with ADHD-C subtype.