Related Experiment Video
Updated: Aug 6, 2026
09:37
A Phenotyping Regimen for Genetically Modified Mice Used to Study Genes Implicated in Human Diseases of Aging
Published on: July 14, 2016
Association Analysis of Inter-Alpha-Trypsin Inhibitor Genes in Schizophrenia
Juntendo Medical Journal
|July 23, 2026
Summary
Genetic analysis suggests the inter-alpha-trypsin inhibitor heavy chain 1 (ITIH1) gene may play a role in schizophrenia. This study investigated ITIH gene variants in a Japanese population, identifying potentially deleterious mutations.
Area of Science:
- Genetics
- Psychiatry
- Molecular Biology
Background:
- Schizophrenia (SCZ) is a prevalent psychiatric disorder with high heritability (60-85%).
- Genome-wide association studies (GWAS) have identified inter-alpha-trypsin inhibitor heavy chain (ITIH) family genes on chromosome 3p21 as associated with SCZ in European populations.
- Previous research indicates a potential link between ITIH genes and major psychotic disorders.
Purpose of the Study:
- To investigate the association of single-nucleotide polymorphisms (SNPs) within the ITIH gene cluster at 3p21 with schizophrenia risk in a Japanese population.
- To identify and analyze novel single-nucleotide variants (SNVs) in the ITIH1 gene.
- To predict the functional impact of ITIH1 variants on protein stability and schizophrenia pathophysiology.
Main Methods:
- Case-control association analysis and haplotype analysis of SNPs in the ITIH gene cluster.
- Resequencing of the ITIH1 gene to detect SNVs.
- Protein structural analysis to assess the effect of identified variants on protein stability.
Main Results:
- A significant difference in haplotype frequencies was observed for a two-SNP window (rs2710322 and rs1042779).
- Resequencing of ITIH1 identified four potentially deleterious variants.
- Structural analysis provided predictions regarding the impact of these variants on protein stability.
Conclusions:
- The findings suggest a potential role for the ITIH1 gene in the pathophysiology of schizophrenia.
- Further research is warranted to elucidate the specific mechanisms by which ITIH1 variants may contribute to SCZ risk.
Related Concept Videos
01:29Biological Causes of Schizophrenia
Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.
01:11Genome-wide Association Studies-GWAS
Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
GWAS does not require the identification of the target gene involved in...
01:11Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase
Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...